Android 視頻播放器進度的處理，android進度

Android 視頻播放器進度的處理，android進度

在前面的項目中添加SeekBar

 <SeekBar        android:id="@+id/sb"        android:layout_width="match_parent"        android:layout_height="wrap_content" />

相關的代碼如下：

public class MainActivity extends Activity implements OnClickListener {    private EditText et_path;    private Button bt_play, bt_replay, bt_pause, bt_stop;    private SurfaceView sv;    private SeekBar sb;    private MediaPlayer mediaPlayer;    private int currentPosition;    private Boolean isplaying;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        sv = (SurfaceView) findViewById(R.id.sv);        et_path = (EditText) findViewById(R.id.et_path);        bt_play = (Button) findViewById(R.id.bt_play);        bt_replay = (Button) findViewById(R.id.bt_replay);        bt_pause = (Button) findViewById(R.id.bt_pause);        bt_stop = (Button) findViewById(R.id.bt_stop);        sb = (SeekBar) findViewById(R.id.sb);                sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {                        @Override            public void onStopTrackingTouch(SeekBar seekBar) {                int process = seekBar.getProgress();                if(mediaPlayer != null && mediaPlayer.isPlaying()) {                    mediaPlayer.seekTo(process);                }                            }                        @Override            public void onStartTrackingTouch(SeekBar seekBar) {                // TODO Auto-generated method stub                            }                        @Override            public void onProgressChanged(SeekBar seekBar, int progress,                    boolean fromUser) {                // TODO Auto-generated method stub                            }        });        bt_pause.setOnClickListener(this);        bt_play.setOnClickListener(this);        bt_replay.setOnClickListener(this);        bt_stop.setOnClickListener(this);        sv.getHolder().addCallback(new Callback() {            @Override            public void surfaceDestroyed(SurfaceHolder holder) {                System.out.println("holder被銷毀了");                if (mediaPlayer != null && mediaPlayer.isPlaying()) {                    currentPosition = mediaPlayer.getCurrentPosition();                    stop();                }            }            @Override            public void surfaceCreated(SurfaceHolder holder) {                System.out.println("holder被建立了");                if (currentPosition > 0) {                    play(currentPosition);                }            }            @Override            public void surfaceChanged(SurfaceHolder holder, int format,                    int width, int height) {                System.out.println("holder的大小變化了");            }        });    }    @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.bt_play:            play(0);            break;        case R.id.bt_replay:            replay();            break;        case R.id.bt_stop:            stop();            break;        case R.id.bt_pause:            pause();            break;        default:            break;        }    }    /**     * 暫停音樂     */    private void pause() {        if ("繼續".equals(bt_pause.getText().toString().trim())) {            mediaPlayer.start();            bt_pause.setText("暫停");            return;        }        if (mediaPlayer != null && mediaPlayer.isPlaying()) {            mediaPlayer.pause();            bt_pause.setText("繼續");            return;        }    }    /**     * 重新播放     */    private void replay() {        if (mediaPlayer != null && mediaPlayer.isPlaying()) {            mediaPlayer.seekTo(0);            return;        }        play(0);    }    /**     * 停止播放音樂     */    private void stop() {        if (mediaPlayer != null && mediaPlayer.isPlaying()) {            mediaPlayer.stop();            mediaPlayer.release(); // 記得釋放資源            mediaPlayer = null;            bt_play.setEnabled(true);            isplaying = false;        }    }    /**     * 播放音樂     */    private void play(final int currentPosition) {        String path = et_path.getText().toString().trim();        try {            mediaPlayer = new MediaPlayer();            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);            /* 設定Video影片以SurfaceHolder播放 */            mediaPlayer.setDisplay(sv.getHolder());            mediaPlayer.setDataSource(path);            mediaPlayer.prepare(); // might take long! (for buffering, etc)            //mediaPlayer.prepareAsync();            mediaPlayer.setOnPreparedListener(new OnPreparedListener() {                @Override                public void onPrepared(MediaPlayer mp) {                    mediaPlayer.start();                    int max = mediaPlayer.getDuration();                    sb.setMax(max);                    mediaPlayer.seekTo(currentPosition);                    new Thread() {                        public void run() {                            isplaying = true;                            while (isplaying) {                                int position = mediaPlayer.getCurrentPosition();                                sb.setProgress(position);                                try {                                    Thread.sleep(500);                                } catch (InterruptedException e) {                                    // TODO Auto-generated catch block                                    e.printStackTrace();                                }                            }                        };                    }.start();                }            });            mediaPlayer.setOnCompletionListener(new OnCompletionListener() {                @Override                public void onCompletion(MediaPlayer mp) {                    bt_play.setEnabled(true);                }            });            bt_play.setEnabled(false);        } catch (Exception e) {            Toast.makeText(this, "播放失敗", 0).show();            e.printStackTrace();        }    }}