Help Android Not finding the View Component

[Fahman Khan]

This is main activity class I have.

package com.example.fahman_khan75.testing;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.app.Activity;

public class MainActivity extends Activity
{
TextView my=(TextView)findViewById(R.id.textId);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }


}

Here is the android manifest file

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.fahman_khan75.testing" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Here is my XML file for mainactivity

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textId" />

</RelativeLayout>

I know the error is in this piece of following code.

TextView my=(TextView)findViewById(R.id.textId);

I have searched everywhere on google to resolve this issue, but none of those remedies seems to fixing my problem at all. I keep getting a nullpointer exception which I don't know why. 5 weeks ago, I had no such problem like this; however, I first encountered this problem yesterday. I have even reinstalled android studio but the problem still won't go away.

Also here is the logcat


08-12 02:53:30.279 378-471/system_process W/NetworkManagementSocketTagger﹕ setKernelCountSet(10055, 1) failed with errno -1
08-12 02:53:30.323 2600-2600/com.example.fahman_khan75.testing D/AndroidRuntime﹕ Shutting down VM
08-12 02:53:30.323 2600-2600/com.example.fahman_khan75.testing W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xa62c1288)
08-12 02:53:30.327 2600-2600/com.example.fahman_khan75.testing E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.fahman_khan75.testing/com.example.fahman_khan75.testing.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at android.app.Activity.findViewById(Activity.java:1825)
at com.example.fahman_khan75.testing.MainActivity.<init>(MainActivity.java:12)
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1319)
at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-12 02:53:30.327 378-378/system_process W/ActivityManager﹕ Force finishing activity com.example.fahman_khan75.testing/.MainActivity
08-12 02:53:30.475 415-416/? E/SocketStream﹕ readFully was waiting for 764896 bytes, got 49152
08-12 02:53:30.475 415-416/? E/SocketStream﹕ readFully was waiting for 715744 bytes, got 49152
08-12 02:53:30.475 415-416/? E/SocketStream﹕ readFully was waiting for 666592 bytes, got 49152
08-12 02:53:30.479 415-416/? E/SocketStream﹕ readFully was waiting for 617440 bytes, got 49152
08-12 02:53:30.483 415-416/? E/SocketStream﹕ readFully was waiting for 568288 bytes, got 49152
08-12 02:53:30.483 415-416/? E/SocketStream﹕ readFully was waiting for 519136 bytes, got 32768
08-12 02:53:30.483 415-416/? E/SocketStream﹕ readFully was waiting for 486368 bytes, got 196608
08-12 02:53:30.507 415-416/? E/SocketStream﹕ readFully was waiting for 289760 bytes, got 49152
08-12 02:53:30.507 415-416/?