Android多媒體應(yīng)用 二

音頻和視頻播放

音頻播放

步驟：

1. 創(chuàng)建MediaPlayer
2. 綁定監(jiān)聽(tīng)
3. 運(yùn)行時(shí)權(quán)限處理
4. 完善onClick()
5. 重寫(xiě)onDestory()花沉，釋放MediaPlayer

代碼

//布局就是4個(gè)按鈕
public class MainActivity extends AppCompatActivity {
    MediaPlayer mediaPlayer = new MediaPlayer();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
//ButterKnife綁定
        ButterKnife.bind(this);
//運(yùn)行時(shí)權(quán)限
        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
        }else{
            initMediaPlayer();//初始化MediaPlayer
        }
    }

    private void initMediaPlayer() {
        try {
            File file = new File(Environment.getExternalStorageDirectory(),"music.mp3");
            mediaPlayer.setDataSource(file.getPath());//指定音頻路徑
            mediaPlayer.prepare();//讓MediaPlayer進(jìn)入準(zhǔn)備階段
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @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{
                    Toast.makeText(this,"拒絕權(quán)限將無(wú)法使用程序",Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
        }
    }

    @OnClick({R.id.play,R.id.pause,R.id.stop,R.id.jump})
    public void onClick(View v){
        switch (v.getId()){
            case R.id.play:
                if (!mediaPlayer.isPlaying()){
                    mediaPlayer.start();
                }
                break;
            case R.id.pause:
                if (mediaPlayer.isPlaying()){
                    mediaPlayer.pause();
                }
                break;
            case R.id.stop:
                if (mediaPlayer.isPlaying()){
                    mediaPlayer.reset();
                    initMediaPlayer();
                }
                break;
            default:
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mediaPlayer != null){
            mediaPlayer.stop();
            mediaPlayer.release();//釋放掉與MediaPlayer是否正在播放音頻
        }
    }
}

MediaPlayer常用方法：

注意：
我們還要在AndroidMainfest文件中添加上權(quán)限：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

視頻播放

步驟：

1. 獲取VideoView
2. 綁定監(jiān)聽(tīng)
3. 運(yùn)行權(quán)限處理
4. 完善onClick()
5. 重寫(xiě) onDestory()棚饵，釋放VideoView

代碼：

//布局是三個(gè)button加一個(gè)VideoView
public class VideoActivity extends AppCompatActivity {
    @BindView(R.id.video_view)
    VideoView videoView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video);
        ButterKnife.bind(this);
//運(yùn)行和權(quán)限處理
        if (ContextCompat.checkSelfPermission(VideoActivity.this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) !=
                PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(VideoActivity.this,
                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1);
        }else{
            initVideoPath();
        }
    }

    private void initVideoPath() {
        File file = new File(Environment.getExternalStorageDirectory(),"movie.mp4");
        //初始化VideoView
        videoView.setVideoPath(file.getPath());
    }

    @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){
                    initVideoPath();
                }else{
                    Toast.makeText(this,"拒絕權(quán)限將無(wú)法使用程序",Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
            default:
                break;
        }
    }

    @OnClick({R.id.play_video,R.id.pause_video,R.id.replay_video})
    public void onClick(View v){
        switch (v.getId()){
            case R.id.play_video:
                if (!videoView.isPlaying()){
                    videoView.start();
                }
                break;
            case R.id.pause_video:
                if (videoView.isPlaying()){
                    videoView.pause();
                }
                break;
            case R.id.replay_video:
                if (videoView.isPlaying()){
                    videoView.resume();
                }
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (videoView != null){
            videoView.suspend();//釋放資源
        }
    }
}

VideoView常用方法：

注意：
兩個(gè)示例代碼都需要在手機(jī)的根目錄下預(yù)先放好一個(gè)音頻和視頻。

示例來(lái)源于《Android第一行代碼》摹闽，邊讀邊敲懈玻，益于學(xué)習(xí)二庵。