Question

我有一些代码，该代码具有用于实现所需输出的开关实现。现在，我需要该实现也具有下一个和上一个按钮。但是我不知道简单的解决方案，这是入门。这是我的代码：

   private MediaPlayer clipSetup(int i){
    switch (i){
        case 1:
            mediaPlayer = MediaPlayer.create(this, R.raw.al01);
            mediaPlayer.start(); 
            break;
        case 2:
            mediaPlayer = MediaPlayer.create(this, R.raw.al02);
            mediaPlayer.start();    
            break;
        case 3:
            mediaPlayer = MediaPlayer.create(this, R.raw.al02);
            mediaPlayer.start();
            break;
        }
        return mediaPlayer;
     }

现在看这段代码，我希望我可以执行OnClick按钮。

Answer 1

希望这会对您有所帮助。

int current=0;
@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.btn_back:
            current++;
            break;
        case R.id.btn_next:
            if(current<=0)
                current=2;
            else
            current--;
            break;
    }
    clipSetup(current%3+1);
}

Answer 2

如果您需要实现远程按钮，请使用下面的代码。

        int keycode = event.getKeyCode();

        if(event.getAction() != KeyEvent.ACTION_DOWN){
            return true;
        }

            switch (keycode){
                case KeyEvent.KEYCODE_DPAD_LEFT :
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            rewindSurfacePlayer();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_DPAD_RIGHT:
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            fastForwardSurfacePlayer();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_DPAD_UP:
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            showSurfaceControls();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_DPAD_DOWN:
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            if(!vidPaused){
                                pauseSurfacePlayer();
                            }else {
                                playSurfacePlayer();
                            }
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_PROG_RED://rewind
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            rewindSurfacePlayer();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_PROG_GREEN://forward
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            fastForwardSurfacePlayer();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            if(!vidPaused){
                                pauseSurfacePlayer();
                            }else {
                                playSurfacePlayer();
                            }
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_STOP:
                    stopVideo();
                    break;
                case 23://play/pause
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            if(!vidPaused){
                                pauseSurfacePlayer();
                            }else {
                                playSurfacePlayer();
                            }
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            fastForwardSurfacePlayer();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_REWIND:
                    if(videoType.equals(GENERAL)){
                        if(event.getAction() == KeyEvent.ACTION_DOWN){
                            rewindSurfacePlayer();
                        }
                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_PAUSE:
                    if(event.getAction() == KeyEvent.ACTION_DOWN){
                        pauseSurfacePlayer();
                    }
                    break;
                case KeyEvent.KEYCODE_MEDIA_PLAY:
                    if(event.getAction() == KeyEvent.ACTION_DOWN){
                        playSurfacePlayer();
                    }
                    break;
            }

这需要继续使用dispatchKeyEvent方法btw。您也可以在此处执行后退按钮的手柄。无需使用onBackPressed方法。如果您已经在使用onBackPressed，并且想使用dispatchKeyEvent，请删除您的onBackPressed方法。

如何使用此代码实现下一个和上一个按钮？

2 个答案: