警告メッセージでトーストメッセージを正しく置き換える方法

Question

私はAndroid開発の初心者で、オーディオストリームアプリを開発中です。私は最初、オーディオサービスをストリーミング中にエラーが発生したときにユーザーに通知するトーストメッセージを出しました。しかし、私はそれを警告ダイアログに置き換えたいと思っていました。しかし、私はエラーが発生している。ここで

は、私の以前のコードです。ここで

public boolean onError(MediaPlayer mp, int what, int extra) { 
      Toast.makeText(this, "There was an error playing the stream, Check your network connection", Toast.LENGTH_LONG).show(); 
      mediaPlayer.reset(); 
      return false; 
     } 

ここでエラー

public boolean onError(MediaPlayer mp, int what, int extra) { 
     LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View customTitleView = inflater.inflate(R.layout.my_theme, null); 
     AlertDialog.Builder alertbox = new AlertDialog.Builder(this); 
     alertbox.setCancelable(true); 
     alertbox.setView(customTitleView); 
     alertbox.show(); 
     mediaPlayer.reset(); 
     return false; 
    } 

を投げる私の更新されたコードは、エラーです：

FATAL EXCEPTION: main                  android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application 
                          at android.view.ViewRootImpl.setView(ViewRootImpl.java:589) 
                          at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:326) 
                          at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:224) 
                          at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:149) 
                          at android.app.Dialog.show(Dialog.java:277) 
                          at android.app.AlertDialog$Builder.show(AlertDialog.java:932) 
                          at com.musicianfocus.ben.wordedfm.RadioService.onError(RadioService.java:54) 
                          at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:2001) 
                          at android.os.Handler.dispatchMessage(Handler.java:99) 
                          at android.os.Looper.loop(Looper.java:137) 
                          at android.app.ActivityThread.main(ActivityThread.java:4745) 
                          at java.lang.reflect.Method.invokeNative(Native Method) 
                          at java.lang.reflect.Method.invoke(Method.java:511) 
                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
                          at dalvik.system.NativeStart.main(Native Method) 
     06-02 08:43:33.065 321-322/? E/SocketStream: readFully was waiting for 716352 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 700160 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 683968 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 667776 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 651584 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 635392 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 619200 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 603008 bytes, got 16192 
     06-02 08:43:33.089 321-322/? E/SocketStream: readFully was waiting for 586816 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 570624 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 554432 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 538240 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 522048 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 505856 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 489664 bytes, got 16192 
     06-02 08:43:33.093 321-322/? E/SocketStream: readFully was waiting for 473472 bytes, got 16192 
     06-02 08:43:33.097 321-322/? E/SocketStream: readFully was waiting for 457280 bytes, got 16192 
     06-02 08:43:33.097 321-322/? E/SocketStream: readFully was waiting for 441088 bytes, got 161920 
     06-02 08:43:33.101 321-322/? E/SocketStream: readFully was waiting for 279168 bytes, got 155972 
     06-02 08:43:33.105 321-322/? E/SocketStream: readFully was waiting for 123196 bytes, got 16192 
     06-02 08:43:33.105 321-322/? E/SocketStream: readFully was waiting for 107004 bytes, got 16192 
     06-02 08:43:33.109 321-322/? E/SocketStream: readFully was waiting for 90812 bytes, got 16192 
     06-02 08:43:33.109 321-322/? E/SocketStream: readFully was waiting for 74620 bytes, got 16192 
     06-02 08:43:33.109 321-322/? E/SocketStream: readFully was waiting for 58428 bytes, got 16192 
     06-02 08:43:33.109 321-322/? E/SocketStream: readFully was waiting for 42236 bytes, got 16192 
     06-02 08:43:33.109 321-322/? E/SocketStream: readFully was waiting for 26044 bytes, got 16192 
     06-02 08:48:37.733 321-322/? E/SocketStream: readFully was waiting for 716352 bytes, got 16192 
     06-02 08:48:37.733 321-322/? E/SocketStream: readFully was waiting for 700160 bytes, got 16192 
     06-02 08:48:37.733 321-322/? E/SocketStream: readFully was waiting for 683968 bytes, got 1619 

Answer 1

AlertDialog.Builder builder; 
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
     builder = new AlertDialog.Builder(context, android.R.style.Theme_Material_Dialog_Alert); 
    } else { 
     builder = new AlertDialog.Builder(context); 
    } 
    builder.setTitle("Connection Issue") 
    .setMessage("There was an error playing the stream, Check your network connection") 
    .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      // continue with on ok 
     } 
    }) 
    .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int which) { 
      // do nothing 
     } 
    }) 
    .setIcon(android.R.drawable.ic_dialog_alert) 
    .show(); 

Answer 2

だけ作りますのこのメソッドCTRL + Gを使用して実装を見つけ、CommonClass.showAlertDialog(this, "Your Title here","There was an error playing the stream, Check your network connection")

public static void showAlertDialog(Activity activity, final String Title, final String Message){ 
      activity.runOnUiThread(new Runnable() { 
       public void run() { 
        new AlertDialog.Builder(activity).setMessage(Message).setTitle(Title).setPositiveButton("OK", new DialogInterface.OnClickListener(){ 
         public void onClick(DialogInterface dialog, int id){ 
          dialog.dismiss(); 
         } 
        }).create().show(); 
       } 
      });  
     }