Android开发简单mp3播放器

Android开发简单mp3播放器

简单的mp3播放器，可用于Android课程大作业。可以播放上一首，下一首，停止播放，继续播放，拖动进度条功能。

一、思路

用MediaPlayer

二、效果图：

三、关键代码：

public class MainActivity extends AppCompatActivity {


    private ImageView diskImage;
    private SeekBar musicProgress;
    private TextView currentTime, totalTime;
    private ImageView prevBtn, playPauseBtn, nextBtn;
    private ObjectAnimator animator;
    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 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() {

        diskImage = findViewById(R.id.iv_anim);

        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);

        animator = ObjectAnimator.ofFloat(diskImage, "rotation", 0, 360.0F);  //初始化状态
        animator.setDuration(2000);  //状态时长，10秒
        animator.setInterpolator(new LinearInterpolator());  //时间函数，有很多类型
        animator.setRepeatCount(-1); // 一直旋转

    }

    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() {
        if (isPlaying) {
            player.stop();
            player.reset();
        }
        player = MediaPlayer.create(getApplicationContext(), playList.get(currentPlaying));
        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();
    }

    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
                    animator.start();
                    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
                        animator.start();
                        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
                        animator.resume();
                        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的可以看简介联系我，也可以私信我，我每天都看私信的