实现单例模式的Android模式对话框

Question

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⁃   public class CustomDialogMsgOneBtn
⁃   {
⁃   
⁃      private static CustomDialogMsgOneBtn _instance;
⁃   
⁃      private UIHandler uiHandler;
⁃      public Context _context;
⁃      public Dialog _dialog;
⁃      private Object synchObject = new Object();
⁃   
⁃      private TextView _tvDialogTitle;
⁃      private TextView _tvDialogMessage;
⁃      private String _dialogTitle;
⁃      private String _dialogMessage;
⁃      private Button _btnDialogOk;
⁃      private String _btnTextOk;
⁃   
⁃      private CustomDialogMsgOneBtn()
⁃      {
⁃   
⁃      }
⁃      public static CustomDialogMsgOneBtn getInstance()
⁃      {
⁃         if( _instance == null )
⁃         {
⁃            _instance = new CustomDialogMsgOneBtn();
⁃         }
⁃         return _instance;
⁃      }
⁃   
⁃      public void setTitleAndMessage( String title, String msg )
⁃      {
⁃         this._dialogTitle = title;
⁃         this._dialogMessage = msg;
⁃      }
⁃   
⁃      public void initDialog( Context c )
⁃      {
⁃         _context = c;
⁃      }
⁃   
⁃      public void setButtonTextOk( String sText )
⁃      {
⁃         this._btnTextOk = sText;
⁃      }
⁃   
⁃      private void constructUiThread()
⁃      {
⁃         HandlerThread uiThread = new HandlerThread( "UIHandler" );
⁃         uiThread.start();
⁃         uiHandler = new UIHandler( uiThread.getLooper() );
⁃      }
⁃   
⁃      public void show()
⁃      {
⁃         try
⁃         {
⁃            constructUiThread();
⁃   
⁃            uiHandler.sendEmptyMessage( 0 );
⁃   
⁃            synchronized( synchObject )
⁃            {
⁃               try
⁃               {
⁃                  synchObject.wait();
⁃               }
⁃               catch( InterruptedException e )
⁃               {
⁃                  e.printStackTrace();
⁃               }
⁃            }
⁃   
⁃         }
⁃         catch( Exception e )
⁃         {
⁃            e.printStackTrace();
⁃         }
⁃   
⁃      }
⁃   
⁃      public void dismissDialog()
⁃      {
⁃         _dialog.dismiss();
⁃      }
⁃   
⁃      private final class UIHandler extends Handler
⁃      {
⁃   
⁃         public View.OnClickListener btnListener = new View.OnClickListener()
⁃         {
⁃   
⁃            @Override
⁃            public void onClick( View v )
⁃            {
⁃   
⁃               int id = v.getId();
⁃               if( id == R.id.btnDialogOk )
⁃               {
⁃                  Log.d( "dialog Ok", "Ok" );
⁃   
⁃                  notifySync();
⁃               }
⁃   
⁃            }
⁃         };
⁃   
⁃         public DialogInterface.OnDismissListener dialogOnDismissListener = new DialogInterface.OnDismissListener()
⁃         {
⁃   
⁃            @Override
⁃            public void onDismiss( DialogInterface dialog )
⁃            {
⁃   
⁃               notifySync();
⁃               Log.d( "dialog being dismissed", "dismiss ang dialog" );
⁃            }
⁃         };
⁃   
⁃         public UIHandler( Looper looper )
⁃         {
⁃            super( looper );
⁃         }
⁃   
⁃         @Override
⁃         public void handleMessage( Message msg )
⁃         {
⁃            _dialog = new Dialog( _context );
⁃            _dialog.requestWindowFeature( Window.FEATURE_NO_TITLE );
⁃            _dialog.setCanceledOnTouchOutside( true );
⁃            _dialog.setContentView( R.layout.dialog_message_one_button );
⁃            _dialog.setOnDismissListener( dialogOnDismissListener );
⁃   
⁃            _tvDialogTitle = (TextView)_dialog.findViewById( R.id.txtDialogTitle );
⁃            _tvDialogMessage = (TextView)_dialog.findViewById( R.id.txtDialogMsg );
⁃            _btnDialogOk = (Button)_dialog.findViewById( R.id.btnDialogOk );
⁃   
⁃            _tvDialogTitle.setText( _dialogTitle );
⁃            _tvDialogMessage.setText( _dialogMessage );
⁃            _btnDialogOk.setText( _btnTextOk );
⁃   
⁃            _btnDialogOk.setOnClickListener( btnListener );
⁃   
⁃            _dialog.show();
⁃   
⁃         }
⁃   
⁃         private void notifySync()
⁃         {
⁃            synchronized( synchObject )
⁃            {
⁃               _dialog.dismiss();
⁃               synchObject.notifyAll();
⁃            }
⁃         }
⁃   
⁃      }// end UIHanlder class
⁃   
⁃   } //end Class

CustomDialogMsgTwoBtn.getInstance().initDialog(this);
CustomDialogMsgTwoBtn.getInstance().setLeftAndRightButtonText( "cancel", "accept" );
CustomDialogMsgTwoBtn.getInstance().setTitleAndMessage( "Custom Dialog", "test msg" );
CustomDialogMsgTwoBtn.getInstance().show();

Answer 1

不要那样做！一旦你停止了UI线程，Android系统就会向用户显示一个对话框来尝试关闭！！

使用托管对话框，而不是http://developer.android.com/guide/topics/ui/dialogs.html