视频 音频调用

音频：MediaPlayer

1.方法列表

方法名	作用
setDataSource()	设置音频文件位置
prepare()	播放前准备工作
start()	开始/继续播放
pause()	暂停播放
reset()	重置播放器
seekTo()	跳转到指定位置播放
stop()	停止播放，且该实例无法再次播放音频
release()	释放MediaPlayer资源，onDestory时调用
isPlaying()	返回boolean，是否正在播放
getDuration()	获取音频时长

2.SampleCode

public class MediaPlayerActivity extends AppCompatActivity implements View.OnClickListener {
    private MediaPlayer mediaPlayer = new MediaPlayer();
    private Button play_Button;
    private Button stop_Button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_media_player);
        initView();
        if (checkPermission()) {
            initMediaPlayer();
        } else {
            requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
        }
    }

    private void initView() {
        play_Button = findViewById(R.id.button_play);
        stop_Button = findViewById(R.id.button_stop);

        play_Button.setOnClickListener(this);
        stop_Button.setOnClickListener(this);
    }

    private void initMediaPlayer() {
        try {
            File file = new File(Environment.getExternalStorageDirectory(), "music.mp3");
            mediaPlayer.setDataSource(file.getPath());  //locate file path for media player
            mediaPlayer.prepare();                      //prepare media player
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private boolean checkPermission() {
        return checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //release resources
        if (mediaPlayer != null) {
            mediaPlayer.stop();
            mediaPlayer.release();
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button_play:
                if (mediaPlayer.isPlaying()) {
                    //switch to pause
                    mediaPlayer.pause();
                    play_Button.setText("play");
                } else {
                    mediaPlayer.start();
                    play_Button.setText("pause");
                }
                break;
            case R.id.button_stop:
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.reset();
                    initMediaPlayer();
                }
                break;
            default:
                break;
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    initMediaPlayer();
                } else {
                    //permission not granted
                    finish();
                }
                break;
            default:
                return;
        }
    }
}

视频：VideoView

此处的调用基本与MediaPlayer一致，只列一下该view的常用方法：

1.方法列表

方法名	作用
setVideoPath()	设置视频文件位置
start()	开始/继续播放
pause()	暂停播放
resume()	重头播放
seekTo()	跳转到指定位置播放
isPlaying()	返回boolean，是否正在播放
getDuration()	获取视频时长