Android MediaPlay的使用以及实现音频播放器

一、MediaPlay状态机详解（MediaPlay的生命周期）
MediaPlayer状态机如下图所示

3、在AndroidManifest.xml中添加权限

android:requestLegacyExternalStorage="true"
public class PermissionsManagement {
    private static final String TAG = "PermissionsManagement";
    public static void requestMyPermissions(Activity mActivity) {
        if (ContextCompat.checkSelfPermission(mActivity,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //没有授权，编写申请权限代码
            ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 100);
        } else {
            Log.d(TAG, "requestMyPermissions: 有写SD权限");
        }
        if (ContextCompat.checkSelfPermission(mActivity,
                Manifest.permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED) {
            //没有授权，编写申请权限代码
            ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 100);
        } else {
            Log.d(TAG, "requestMyPermissions: 有读SD权限");
        }
    }
}

4、然后在MainActivity 实现功能。

public class MainActivity extends AppCompatActivity implements MyMusicPlayer.OnMyPreparedListener {
    private static final String TAG = "wq892373445";
    // Used to load the 'native-lib' library on application startup.
    static {
        System.loadLibrary("native-lib");
    }
    private MyMusicPlayer mMyMusicPlayer;
    //显示流媒体的总播放时长
    private TextView tv_end;
    private SeekBar seekbar;
    private TextView tv_start;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        PermissionsManagement.requestMyPermissions(this);
        seekbar = (SeekBar)findViewById(R.id.seekbar);
        tv_end = (TextView)findViewById(R.id.tv_end);
        tv_start = (TextView)findViewById(R.id.tv_start);
        //绑定监听器，监听拖动到指定位置
        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                int duration2 = mMyMusicPlayer.getDuration() / 1000;//获取音乐总时长
                int position = mMyMusicPlayer.getCurrentPosition();//获取当前播放的位置
                tv_start.setText(mMyMusicPlayer.calculateTime(position / 1000));//开始时间
                tv_end.setText(mMyMusicPlayer.calculateTime(duration2));//总时长
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                mMyMusicPlayer.setSeekbarChaning(true);
            }
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                mMyMusicPlayer.setSeekbarChaning(false);
                mMyMusicPlayer.setSeekto(seekBar.getProgress());//在当前位置播放
                tv_start.setText(mMyMusicPlayer.formattime(mMyMusicPlayer.getCurrentPosition()));
            }
        });
        mMyMusicPlayer = new MyMusicPlayer();
        mMyMusicPlayer.setOnMyPreparedListener(this);
        int duration2 = mMyMusicPlayer.getDuration() / 1000;//获取音乐总时长
        int position = mMyMusicPlayer.getCurrentPosition();//获取当前播放的位置
        tv_start.setText(mMyMusicPlayer.calculateTime(position / 1000));//开始时间
        tv_end.setText(mMyMusicPlayer.calculateTime(duration2));//总时长
    }
    
    public native String stringFromJNI();
    @Override
    protected void onDestroy() {
        mMyMusicPlayer.release();
        super.onDestroy();
    }
    
    public void onPlay(View view) {
        mMyMusicPlayer.Play(seekbar);
    }
    
    public void onPause(View view) {
        mMyMusicPlayer.Pause();
    }
    
    public void onReplay(View view) {
        mMyMusicPlayer.Replay();
    }
    
    public void onStop(View view) {
        mMyMusicPlayer.Stop();
    }
    
    public void onLooping(View view) {
        mMyMusicPlayer.setLooping(true);
    }
    @Override
    public void onMyPrepared() {
        Log.d(TAG, "onPrepared()");
        // 装载完毕回调
        //获取流媒体的总播放时长，单位是毫秒。
        tv_end.setText(mMyMusicPlayer.calculateTime((mMyMusicPlayer.getDuration()/ 1000)));
        Log.d(TAG, "总的播放时长："+mMyMusicPlayer.getDuration());
        //获取当前流媒体的播放的位置，单位是毫秒
        tv_start.setText(mMyMusicPlayer.calculateTime((mMyMusicPlayer.getCurrentPosition()/ 1000)));
    }
}

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