title: Can't pass int value between two activities
body: <p>I tried to pass values from my main activity to my finish activity but I always got error in my finish activity. I don't know what's wrong with my code.</p>
  
  <p>Here's my code from my Level1 class:</p>
  
  <p><strong>Note:</strong> the Chronometer is already defined at the top of my activity, before onCreate method.</p>
  
  <pre><code>private void showElapsedTime() {
      chrono.start();
      long timeElapsed = SystemClock.elapsedRealtime() - chrono.getBase();            
      int hours = (int) (timeElapsed / 3600000);
      int minutes = (int) (timeElapsed - hours * 3600000) / 60000;
      int seconds = (int) (timeElapsed - hours * 3600000 - minutes * 60000) / 1000;
      int seco = seconds;
  
      Toast.makeText(this, "Elapsed milliseconds: " + seconds, 
              Toast.LENGTH_SHORT).show();
  
      Intent a = new Intent (this, Finish.class);
  
      Bundle b = new Bundle();
      b.putInt("sec", seco);
      a.putExtras(b);
  }
  </code></pre>
  
  <p>and this one is my Finish.class code:</p>
  
  <pre><code>Set1 = (TextView) findViewById (R.id.time1);
  Bundle b = getIntent().getExtras();
  
  Set1.setText("time: " + b.getInt("seco"));
  </code></pre>
  
  <p><strong>LOGCAT:</strong></p>
  
  <pre><code>08-20 11:37:49.345: E/AndroidRuntime(815): FATAL EXCEPTION: main
  08-20 11:37:49.345: E/AndroidRuntime(815): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mathattack/com.example.mathattack.Finish}: java.lang.NullPointerException
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.os.Handler.dispatchMessage(Handler.java:99)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.os.Looper.loop(Looper.java:123)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.ActivityThread.main(ActivityThread.java:4627)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at java.lang.reflect.Method.invokeNative(Native Method)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at java.lang.reflect.Method.invoke(Method.java:521)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at dalvik.system.NativeStart.main(Native Method)
  08-20 11:37:49.345: E/AndroidRuntime(815): Caused by: java.lang.NullPointerException
  08-20 11:37:49.345: E/AndroidRuntime(815):  at com.example.mathattack.Finish.onCreate(Finish.java:33)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
  08-20 11:37:49.345: E/AndroidRuntime(815):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
  08-20 11:37:49.345: E/AndroidRuntime(815):  ... 11 more
  </code></pre>