Apps Debugging help. Force Close. Very Simple app.

[brade]

I'm just starting out, trying to get my feet wet...

Here's my xml:


<?xmlversion="1.0"encoding="utf-8"?>

<​

​

LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

androidrientation="vertical"

android:layout_width="fill_parent"
android:layout_height="fill_parent"
>​

<TextViewandroid:text="Press the Button"

android:id="@+id/text01"

android:layout_marginLeft = "90dip"
android:layout_marginTop = "150dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>​

<Button
android:text="The Button"

android:id="@+id/Button01"

android:layout_margin="100dip"
android:layout_width="wrap_content"
android:layout_height="wrap_content">​

</Button>​

</LinearLayout>

And here's my java:​

package com.brian.first_try;​

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;​

public class first_try extends Activity

{

/** Called when the activity is first created. */
@Override
publicvoid onCreate(Bundle savedInstanceState)
{
final TextView myText = (TextView) findViewById(R.id.text01);
final Button myButton = (Button) findViewById(R.id.Button01);
super.onCreate(savedInstanceState);
// myButton.setOnClickListener(new View.OnClickListener()
// {
// public void onClick(View v)
// {
// myText.setText("Great Job!");
// }
// }); ​

setContentView(R.layout.​

main);

}

}​

It runs fine until I remove the comment //'s. What Am I doing wrong?!!​

 

[dmitriyk]

You need to call setContentView() before you call findViewById(). Otherwise, findViewById() returns null and you get a NullPointerException when you try to call setOnClickListener().

 

[brade]

Thank you so much. I was freaking out for hours.... lol. thanks again. (Yay, my button works!)