Android中的進度條

我試圖在我的應用程序中實現ProgressBar，當我點擊播放聲音的Button時顯示。Android中的進度條

我已經完成了編碼，但是我得到了運行時異常並且應用程序沒有啓動。在這裏，我發佈我的代碼供參考。

holder.imgPlaybtn.setOnClickListener(new View.OnClickListener() 
      { 

       public void onClick(View v) 
       { 
        ProgressDialog progressDialog; 
        OnClickListener myContext = this; 
        progressDialog = new ProgressDialog((Context) myContext); 
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); 
        progressDialog.setMessage("..."); 
        progressDialog.setCancelable(false); 

       } 
      });

的logcat的輸出是：

12-02 12:19:58.268: ERROR/AndroidRuntime(392): java.lang.ClassCastException: com.android.soundmachine.Switch2DataList$SoundMacHineAdapter$2 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at com.android.soundmachine.Switch2DataList$SoundMacHineAdapter$2.onClick(Switch2DataList.java:1645) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.View.performClick(View.java:2364) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.View.onTouchEvent(View.java:4179) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.View.dispatchTouchEvent(View.java:3709) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.app.Activity.dispatchTouchEvent(Activity.java:2061) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1691) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.os.Handler.dispatchMessage(Handler.java:99) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.os.Looper.loop(Looper.java:123) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at android.app.ActivityThread.main(ActivityThread.java:4363) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at java.lang.reflect.Method.invoke(Method.java:521) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 
12-02 12:19:58.268: ERROR/AndroidRuntime(392):  at dalvik.system.NativeStart.main(Native Method) 
12-02 12:19:58.287: INFO/Process(52): Sending signal. PID: 392 SIG: 3 
12-02 12:19:58.287: INFO/dalvikvm(392): threadid=7: reacting to signal 3 
12-02 12:19:58.287: ERROR/dalvikvm(392): Unable to open stack trace file '/data/anr/traces.txt': Permission denied 
12-02 12:20:05.098: DEBUG/dalvikvm(99): GC freed 2375 objects/139384 bytes in 81ms 
12-02 12:20:10.077: DEBUG/dalvikvm(212): GC freed 43 objects/2096 bytes in 58ms

任何機構可以幫我嗎？

謝謝，大衛，

來源

2010-12-02 David Brown

如果您遇到異常，請發送logcat輸出。 – EboMike 2010-12-02 06:49:28

progressDialog = new ProgressDialog（（Context）myContext）; 這是錯誤的，可以改爲使用它：

progressDialog = new ProgressDialog(v.getContext());

而且也，你忘了叫show()方法來顯示進度對話框，在最後寫了下面一行：

progressDialog.show();

來源

2010-12-02 07:13:02

progressDialog =新ProgressDialog（（上下文）myContext）;

這個錯誤。使用「this」的活動而不是「myContext」

來源

2010-12-02 06:58:50 CodeBanBan

Android中的進度條

回答

相關問題