title: Android: app crashes on starting new activity
body: <p>Basicaly, I want to start an activity that prints out the input string and an image under.</p>
  
  <p>In activity_display_message.xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout 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:orientation="vertical" &gt;
  
        &lt;TextView 
              android:text="@+id/textView"
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              /&gt;
  
          &lt;ImageView
          android:id="@+id/imageView2"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:src="@drawable/serious" /&gt;    
  
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>This is the code in OnCreate():</p>
  
  <pre><code>    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_display_message);  
      Intent intent = getIntent();
  
      String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
  
      ImageView image2 = (ImageView) findViewById(R.id.imageView2);
  
  
      // Create the text view
  
      TextView textView = (TextView)findViewById(R.id.textView);
      //textView.setTextSize(20);
  
      textView.setText(message);
      // Set the text view as the activity layout   
  
  
      // Show the Up button in the action bar.
      setupActionBar();
  }
  </code></pre>
  
  <p>Is there anything wrong with this code?</p>
  
  <p>EDIT: Not sure how to get the stack trace, but I just found these lines in Catlog:</p>
  
  <pre><code>07-05 12:26:53.677: E/AppsCustomizePagedView(611): Widget ComponentInfo{com.th.android.widget.gTabsimiClock/com.th.android.widget.gTabsimiClock.GTabsimiClock5x1} can not fit on this device (736, 144)
  07-05 12:26:53.692: E/AppsCustomizePagedView(611): Widget ComponentInfo{at.abraxas.powerwidget.free/at.abraxas.powerwidget.free.SettingsAppWidgetProvider_5} can not fit on this device (760, 80)
  07-05 12:26:57.958: E/AudioCache(131): Error 1, -1004 occurred
  07-05 12:26:58.146: E/AudioCache(131): Error 1, -1004 occurred
  07-05 12:26:58.630: E/AudioCache(131): Error 1, -1004 occurred
  07-05 12:27:07.833: E/AudioCache(131): Heap size overflow! req size 1052672, max size: 1048576
  </code></pre>
  
  <p>Is this the stack trace?</p>
  
  <pre><code>07-05 12:41:10.058: E/TAG(22474): STACKTRACE
  07-05 12:41:10.058: E/TAG(22474): java.lang.NullPointerException
  07-05 12:41:10.058: E/TAG(22474):   at com.example.myfirstapp.DisplayMessageActivity.onCreate(DisplayMessageActivity.java:38)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.Activity.performCreate(Activity.java:5104)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.ActivityThread.access$600(ActivityThread.java:141)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
  07-05 12:41:10.058: E/TAG(22474):   at android.os.Handler.dispatchMessage(Handler.java:99)
  07-05 12:41:10.058: E/TAG(22474):   at android.os.Looper.loop(Looper.java:137)
  07-05 12:41:10.058: E/TAG(22474):   at android.app.ActivityThread.main(ActivityThread.java:5041)
  07-05 12:41:10.058: E/TAG(22474):   at java.lang.reflect.Method.invokeNative(Native Method)
  07-05 12:41:10.058: E/TAG(22474):   at java.lang.reflect.Method.invoke(Method.java:511)
  07-05 12:41:10.058: E/TAG(22474):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  07-05 12:41:10.058: E/TAG(22474):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  07-05 12:41:10.058: E/TAG(22474):   at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>Stack trace when crashes at runtime: (the one above was obtained by doing try / catch)</p>
  
  <pre><code>07-05 12:52:24.386: E/AndroidRuntime(25496): FATAL EXCEPTION: main
  07-05 12:52:24.386: E/AndroidRuntime(25496): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myfirstapp/com.example.myfirstapp.DisplayMessageActivity}: java.lang.NullPointerException
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.os.Handler.dispatchMessage(Handler.java:99)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.os.Looper.loop(Looper.java:137)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.ActivityThread.main(ActivityThread.java:5041)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at java.lang.reflect.Method.invokeNative(Native Method)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at java.lang.reflect.Method.invoke(Method.java:511)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at dalvik.system.NativeStart.main(Native Method)
  07-05 12:52:24.386: E/AndroidRuntime(25496): Caused by: java.lang.NullPointerException
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at com.example.myfirstapp.DisplayMessageActivity.onCreate(DisplayMessageActivity.java:38)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.Activity.performCreate(Activity.java:5104)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
  07-05 12:52:24.386: E/AndroidRuntime(25496):    ... 11 more
  </code></pre>
  
  <p>message is not null. When I change OnCreate to below, the message is printed: (but of course, not the image)</p>
  
  <pre><code>// Create the text view
  
  //TextView textView = (TextView)findViewById(R.id.textView);
  TextView textView = new TextView(this);
  textView.setTextSize(20);
  
  textView.setText(message);
  setContentView(textView);
  </code></pre>
  
  <p>ANSWER: Found the mistake: android:text="@+id/textView" . Should be android:id, not android:text ...</p>
  
  <p>But thank you all for your help. You guys have made the android programming experience for beginners like me a lot better. </p>