Apps Textfield

Wouter Schurgers · Sep 9, 2019

Hey,

Kan iemand mij helpen met deze oefening?(zie bijlage)

Ik snap niet hoe je een textfield invoegd.

Alvast bedankt!

Groeten Wouter

kate · Sep 9, 2019

Welcome to the site Wouter

This is an English forum, if you don't know English you can use Google Translate:
https://translate.google.com/

Translated:
Can someone help me with this exercise (see attachment)

I don't understand how to insert a textfield.

Thanks in advance!

Greum · Sep 9, 2019

You might find you'll get more help if you post your code as text rather than a photograph.

Wouter Schurgers · Sep 11, 2019

Hey

Can someone help me with this exercise (see attachment)

I don't understand how to insert a textfield.
(I am a beginner)

Thanks in advance!
(I hope you understand)

Greetings Wouter

kate · Sep 11, 2019

Wouter Schurgers said:
I don't understand how to insert a textfield.

To post code on this forum:

[CODE]
Your
Code
Here
[/CODE]

Here is the code from your attached document:

Code:

package com.example.oefenjava2;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    String rechtKinderbijslag;
    int leeftijd = 22;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        if (leeftijd < 18) {
            rechtKinderbijslag = "wel recht op kinderbijslag";
        } else {
            rechtKinderbijslag = "geen recht op kinderbijslag";
        }
        TextView myTextView = (TextView)findViewById(R.id.textview);
        myTextView.setText(rechtKinderbijslag);
    }
}

Wouter Schurgers · Sep 11, 2019

package com.example.oefenjava2;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
String rechtKinderbijslag;
int leeftijd = 22;
@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (leeftijd < 18) {
rechtKinderbijslag = "wel recht op kinderbijslag";
} else {
rechtKinderbijslag = "geen recht op kinderbijslag";
}
TextView myTextView = (TextView)findViewById(R.id.textview);
myTextView.setText(rechtKinderbijslag);
}
}

It will of course only become really interesting if the app user can enter his / her age himself. The app then shows whether the person is of age. Add this option. You can use an EditText for this. (sorry if it is translated incorrectly)

wseng92 · Sep 12, 2019

if the app user can enter his / her age himself.

Use EditText.

Wouter Schurgers · Sep 20, 2019

Hey,

What am I doing wrong with this code, he keeps saying app stops,

thank you in advance!

Greetings Wouter.

package com.example.kak;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
String childBenefit;
int age;

@override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

EditText editAge = (EditText) findViewById(R.id.editText);
age = Integer.parseInt(editAge.getText().toString());

if( age < 18) {
childBenefit = "entitled to child benefit";
} else {
childBenefit = "no entitlement to child benefit";

}
TextView myTextView = (TextView)findViewById(R.id.textview);
myTextView.setText(childBenefit);
}
}

wseng92 · Sep 20, 2019

Please post stacktrace. You can find it on logcat tab.

Wouter Schurgers · Sep 20, 2019

you mean this?

2019-09-20 20:04:47.508 6341-6341/? I/zygote: Not late-enabling -Xcheck:jni (already on)
2019-09-20 20:04:47.541 6341-6341/? W/zygote: Unexpected CPU variant for X86 using defaults: x86
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void com.example.kak.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:17)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.os.Looper.loop() (Looper.java:164)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.example.kak-7pqLwDYU6E5fSFHEEZ0WoA==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.kak-7pqLwDYU6E5fSFHEEZ0WoA==/lib/x86, /system/lib, /vendor/lib]]
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:93)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
2019-09-20 20:04:47.663 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void com.example.kak.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:17)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.os.Looper.loop() (Looper.java:164)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
2019-09-20 20:04:47.664 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void com.example.kak.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:17)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.os.Looper.loop() (Looper.java:164)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.example.kak-7pqLwDYU6E5fSFHEEZ0WoA==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.kak-7pqLwDYU6E5fSFHEEZ0WoA==/lib/x86, /system/lib, /vendor/lib]]
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:93)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void com.example.kak.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:17)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
2019-09-20 20:04:47.665 6341-6341/com.example.kak I/zygote: at void android.os.Looper.loop() (Looper.java:164)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener;
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void com.example.kak.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:17)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.os.Looper.loop() (Looper.java:164)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
2019-09-20 20:04:47.666 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.View$OnUnhandledKeyEventListener" on path: DexPathList[[zip file "/data/app/com.example.kak-7pqLwDYU6E5fSFHEEZ0WoA==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.kak-7pqLwDYU6E5fSFHEEZ0WoA==/lib/x86, /system/lib, /vendor/lib]]
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at java.lang.Class dalvik.system.BaseDexClassLoader.findClass(java.lang.String) (BaseDexClassLoader.java:93)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String, boolean) (ClassLoader.java:379)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at java.lang.Class java.lang.ClassLoader.loadClass(java.lang.String) (ClassLoader.java:312)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2341)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.widget.ActionBarContainer.<init>(android.content.Context, android.util.AttributeSet) (ActionBarContainer.java:62)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance0(java.lang.Object[]) (Constructor.java:-2)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Constructor.newInstance(java.lang.Object[]) (Constructor.java:334)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createView(java.lang.String, java.lang.String, android.util.AttributeSet) (LayoutInflater.java:647)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:790)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.createViewFromTag(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet) (LayoutInflater.java:730)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflate(org.xmlpull.v1.XmlPullParser, android.view.View, android.content.Context, android.util.AttributeSet, boolean) (LayoutInflater.java:863)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.view.LayoutInflater.rInflateChildren(org.xmlpull.v1.XmlPullParser, android.view.View, android.util.AttributeSet, boolean) (LayoutInflater.java:824)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(org.xmlpull.v1.XmlPullParser, android.view.ViewGroup, boolean) (LayoutInflater.java:515)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup, boolean) (LayoutInflater.java:423)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.View android.view.LayoutInflater.inflate(int, android.view.ViewGroup) (LayoutInflater.java:374)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.view.ViewGroup androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor() (AppCompatDelegateImpl.java:607)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor() (AppCompatDelegateImpl.java:518)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatDelegateImpl.setContentView(int) (AppCompatDelegateImpl.java:466)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void androidx.appcompat.app.AppCompatActivity.setContentView(int) (AppCompatActivity.java:140)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void com.example.kak.MainActivity.onCreate(android.os.Bundle) (MainActivity.java:17)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:6975)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1213)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2770)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2892)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.-wrap11(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1593)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:105)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.os.Looper.loop() (Looper.java:164)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6541)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at java.lang.Object java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) (Method.java:-2)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.Zygote$MethodAndArgsCaller.run() (Zygote.java:240)
2019-09-20 20:04:47.667 6341-6341/com.example.kak I/zygote: at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:767)
2019-09-20 20:04:47.757 6341-6341/com.example.kak D/AndroidRuntime: Shutting down VM
2019-09-20 20:04:47.759 6341-6341/com.example.kak E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.kak, PID: 6341
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kak/com.example.kak.MainActivity}: java.lang.NumberFormatException: For input string: ""
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.Integer.parseInt(Integer.java:620)
at java.lang.Integer.parseInt(Integer.java:643)
at com.example.kak.MainActivity.onCreate(MainActivity.java:20)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

wseng92 · Sep 22, 2019

Yes. Can you post your xml layout as well?

Wouter Schurgers · Sep 23, 2019

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="96dp"
android:layout_marginLeft="96dp"
android:layout_marginTop="144dp"
android:layout_marginEnd="102dp"
android:layout_marginRight="102dp"
android:layout_marginBottom="542dp"
android:ems="10"
android:hint="@String/age"
android:importantForAutofill="no"
android:inputType="number"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />

<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.571" />

</androidx.constraintlayout.widget.ConstraintLayout>

wseng92 · Sep 23, 2019

Did it crash after this line removed?

Java:

age = Integer.parseInt(editAge.getText().toString());

Wouter Schurgers · Sep 23, 2019

When i remove this line it doesn't crach.

wseng92 · Sep 23, 2019

It crashed because int cannot hold an empty String. You can use TextWatcher to check the number entered by user.

Java:

public class MainActivity extends AppCompatActivity {
    String childBenefit;
    int age;
    TextView myTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final EditText editAge = (EditText) findViewById(R.id.editText);
        myTextView = (TextView) findViewById(R.id.textview);

        editAge.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // TODO Auto-generated method stub
                if (!editAge.getText().toString().equals("")) {
                    checkAge(Integer.parseInt(editAge.getText().toString()));
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                // TODO Auto-generated method stub
            }

        });
    }

    public void checkAge(int age) {
        if (age < 18) {
            childBenefit = "entitled to child benefit";
        } else {
            childBenefit = "no entitlement to child benefit";
        }
        myTextView.setText(childBenefit);
    }
}

Wouter Schurgers · Sep 23, 2019

Ok it works, thanks verry much for your response,
helped me a lot.
Greetings Wouter

wseng92 · Sep 23, 2019

Welcome.

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