Android开发简单mp4播放器

Android开发简单mp4播放器

简单的mp4播放器，适用于大作业。商业用还是不太行的。商业用一般接的是第三方播放器的。

一、思路：

用MediaPlayer和SurfaceView结合

二、效果图：

看视频直观点：

三、关键代码：

public class Mp4MainActivity extends AppCompatActivity {


    private SurfaceView surface_view;
    private SeekBar musicProgress;
    private TextView currentTime, totalTime;
    private ImageView prevBtn, playPauseBtn, nextBtn;

    private MediaPlayer player;
    private int currentPlaying = 0; //用作ArrayList下表，当前播放的歌曲、
    private ArrayList<Integer> playList = new ArrayList<>();
    private SurfaceHolder surface_holder;

    private boolean isPausing, isPlaying;  //音乐暂停状态，音乐第一次播放之后变为true
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        preparePlayList();
        TimerTask timerTask = new TimerTask() {
            @Override
            public void run() {
                if (isPlaying) {
                    updateTimer();
                }
            }
        };
        new Timer().scheduleAtFixedRate(timerTask, 0, 500);

    }

    private void init() {

        surface_view = findViewById(R.id.surface_view);

        musicProgress = findViewById(R.id.sb_progress);
        currentTime = findViewById(R.id.tv_progress_current);
        totalTime = findViewById(R.id.tv_progress_total);
        prevBtn = findViewById(R.id.btn_prev);
        playPauseBtn = findViewById(R.id.btn_play_pause);
        nextBtn = findViewById(R.id.btn_next);

        View.OnClickListener onClick = new OnClickControl();
        prevBtn.setOnClickListener(onClick);
        playPauseBtn.setOnClickListener(onClick);
        nextBtn.setOnClickListener(onClick);

        OnSeekBarChangeControl onSbChange = new OnSeekBarChangeControl();
        musicProgress.setOnSeekBarChangeListener(onSbChange);

    }

    private void preparePlayList() {
        Field[] field = R.raw.class.getFields();
        for (int count = 0; count < field.length; count++) {
            Log.i("Raw Asset", field[count].getName());
            try {
                int resId = field[count].getInt(field[count]);
                playList.add(resId);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }

    private void prepareMedia() {
        try {
            if (isPlaying) {
                player.stop();
                player.reset();
            }
            player = MediaPlayer.create(getApplicationContext(), playList.get(currentPlaying));
            player.setAudioStreamType(AudioManager.STREAM_MUSIC);
            if (surface_holder == null){
                surface_holder = surface_view.getHolder();
                surface_holder.setFixedSize(1080, 1920);
            }
            player.setDisplay(surface_holder);   /* 设置播放载体 */
            int musicDuration = player.getDuration();
            musicProgress.setMax(musicDuration);
            int sec = musicDuration / 1000;
            int min = sec / 60;
            sec -= min * 60;
            String musicTime = String.format("%02d:%02d", min, sec);
            totalTime.setText(musicTime);
            player.start();
        }catch (Exception e){
            e.printStackTrace();
        }

    }

    private void updateTimer() {
        runOnUiThread(() -> {
            int currentMs = player.getCurrentPosition();
            int sec = currentMs / 1000;
            int min = sec / 60;
            sec -= min * 60;
            String time = String.format("%02d:%02d", min, sec);
            musicProgress.setProgress(currentMs);
            currentTime.setText(time);
        });
    }

    private class OnClickControl implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.btn_prev:
                    //重播
                    playPauseBtn.setImageResource(R.mipmap.ic_pause);  //切换成暂停键

                    if (player != null && !player.isPlaying()) {
                        currentPlaying = --currentPlaying % playList.size();
                    }
                    prepareMedia();
                    isPausing = false;
                    isPlaying = true;
                    break;
                case R.id.btn_play_pause:
                    //开始暂停

                    if (!isPausing && !isPlaying) { //暂停状态，且从未被播放
                        //开始播放
                        playPauseBtn.setImageResource(R.mipmap.ic_pause);  //切换成暂停键

                        prepareMedia();
                        isPlaying = true;
                    } else if (!isPausing && isPlaying) { //暂停状态，且被播放过一次
                        //继续播放
                        playPauseBtn.setImageResource(R.mipmap.ic_pause);//切换成暂停键

                        player.start();
                    } else { //播放状态

四、项目demo源码结构图：

有问题或者需要完整源码demo的私信我