title: Auto force close?
body: <p>I having abit of problem here as when i saw somewhere with calculator codes and use it somehow the app always force close when i started keying in numbers. help?</p>
  
  <pre><code>public void onClickListener8(View v)
  {
      vibrator.vibrate(30);
      if(press=='=')
      {
          onClickListenerReset(buttonClear);
      }
      eight=(String)button8.getText();
      sum=sum+eight;
      editText.setText(sum);
  }
  
  
  04-17 15:38:23.110: E/AndroidRuntime(678): FATAL EXCEPTION: main
  04-17 15:38:23.110: E/AndroidRuntime(678): java.lang.IllegalStateException: Could not     execute method of the activity
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.view.View$1.onClick(View.java:2144)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.view.View.performClick(View.java:2485)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.view.View$PerformClick.run(View.java:9080)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.os.Handler.handleCallback(Handler.java:587)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.os.Handler.dispatchMessage(Handler.java:92)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at android.os.Looper.loop(Looper.java:123)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.app.ActivityThread.main(ActivityThread.java:3683)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     java.lang.reflect.Method.invokeNative(Native Method)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     java.lang.reflect.Method.invoke(Method.java:507)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at dalvik.system.NativeStart.main(Native     Method)
  04-17 15:38:23.110: E/AndroidRuntime(678): Caused by:     java.lang.reflect.InvocationTargetException
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     java.lang.reflect.Method.invokeNative(Native Method)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     java.lang.reflect.Method.invoke(Method.java:507)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.view.View$1.onClick(View.java:2139)
  04-17 15:38:23.110: E/AndroidRuntime(678):  ... 11 more
  04-17 15:38:23.110: E/AndroidRuntime(678): Caused by: java.lang.SecurityException:     Requires VIBRATE permission
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.os.Parcel.readException(Parcel.java:1322)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.os.Parcel.readException(Parcel.java:1276)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.os.IVibratorService$Stub$Proxy.vibrate(IVibratorService.java:106)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     android.os.Vibrator.vibrate(Vibrator.java:52)
  04-17 15:38:23.110: E/AndroidRuntime(678):  at     com.mypackage.Calculator.onClickListener8(Calculator.java:232)
  04-17 15:38:23.110: E/AndroidRuntime(678):  ... 14 more
  </code></pre>