該應用程序已停止工作，因爲動畫問題

Question

嗨，我是新的android開發，我創建一個基本的應用程序與按鈕和動畫，但是，一個按鈕與動畫，但另一個按鈕停止應用程序完全沒有錯誤。 Btn 1（按鈕1）工作，但Btn 2（按鈕2）停止應用程序。 Java代碼如下。任何幫助表示讚賞，在此先感謝。

public class MainActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

      final Animation animAlpha = AnimationUtils.loadAnimation(this, R.anim.anim_alpha); 

    Button btn1 = (Button) findViewById(R.id.categories); 

    btn1.setOnClickListener(new Button.OnClickListener() 
    { 
     @Override 
     public void onClick(View arg0) { 
      arg0.startAnimation(animAlpha); 
      Intent intent = new Intent(getApplicationContext(), Categories.class); 
      Vibrator vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE); 
      vibrator.vibrate(25); 
      Button btn1= (Button) findViewById(R.id.categories); 
      btn1.setBackgroundResource(R.drawable.button_shape2); 
      startActivity(intent); 

    Button btn2 = (Button) findViewById(R.id.feedback); 

     btn2.setOnClickListener(new Button.OnClickListener() 
    { 
      @Override 
      public void onClick(View arg0) { 
       arg0.startAnimation(animAlpha); 
       Intent intent = new Intent(getApplicationContext(), Feedback.class); 
       Vibrator vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE); 
       vibrator.vibrate(25); 
       Button btn2= (Button) findViewById(R.id.feedback); 
       btn2.setBackgroundResource(R.drawable.button_shape2); 
       startActivity(intent);} 
      });}{; 

      }; 
     });}}; 

logcat的

05-03 16:41:02.699: E/AndroidRuntime(24118): FATAL EXCEPTION: main 
05-03 16:41:02.699: E/AndroidRuntime(24118): java.lang.IllegalStateException: Could not find a method Feedback(View) in the activity class com.android.motivateme3.MainActivity for onClick handler on view class android.widget.Button with id 'feedback' 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.view.View$1.onClick(View.java:3090) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.view.View.performClick(View.java:3574) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.view.View$PerformClick.run(View.java:14293) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.os.Handler.handleCallback(Handler.java:605) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.os.Handler.dispatchMessage(Handler.java:92) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.os.Looper.loop(Looper.java:137) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.app.ActivityThread.main(ActivityThread.java:4441) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at java.lang.reflect.Method.invokeNative(Native Method) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at java.lang.reflect.Method.invoke(Method.java:511) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at dalvik.system.NativeStart.main(Native Method) 
05-03 16:41:02.699: E/AndroidRuntime(24118): Caused by: java.lang.NoSuchMethodException: Feedback [class android.view.View] 
05-03 16:41:02.699: E/AndroidRuntime(24118): at java.lang.Class.getConstructorOrMethod(Class.java:460) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at java.lang.Class.getMethod(Class.java:915) 
05-03 16:41:02.699: E/AndroidRuntime(24118): at android.view.View$1.onClick(View.java:3083) 
05-03 16:41:02.699: E/AndroidRuntime(24118): ... 11 more 
05-03 16:41:03.889: I/Process(24118): Sending signal. PID: 24118 SIG: 9 

Answer 1

Caused by: java.lang.NoSuchMethodException: Feedback

請問您的XML提一句的onClick，按鈕應調用該方法的反饋？ 因爲這是問題所在，所以此方法不存在，導致應用程序崩潰。

實施它來解決這個問題。