Android音频和视频播放

Android对于播放音频和视频文件的处理方法很相似，它的区别就在一个调用的是MediaPlayer一个使用用VideoView控件.

一、播放音频

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button button_play;
    private Button button_pause;
    private Button button_stop;
    private MediaPlayer mediaPlayer = new MediaPlayer();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button_play = findViewById(R.id.button_play);
        button_pause = findViewById(R.id.button_pause);
        button_stop = findViewById(R.id.button_stop);
        button_play.setOnClickListener(this);
        button_pause.setOnClickListener(this);
        button_stop.setOnClickListener(this);

        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();
        }
    }

    private void initMediaPlayer() {
        try {
            File file = new File(Environment.getExternalStorageDirectory(),
                    "music.map3");
            mediaPlayer.setDataSource(file.getPath());//指定音频文件的路径
            mediaPlayer.prepare();//让MediaPlayer进入到准备状态
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           @NonNull String[] permissions,
                                           @NonNull int[] grantResults) {

        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] ==
                        PackageManager.PERMISSION_GRANTED) {
                    initMediaPlayer();
                }else {
                    Toast.makeText(this,"拒绝权限将无法使用程序",
                            Toast.LENGTH_SHORT).show();
                    finish();
                }
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button_play:

                if (!mediaPlayer.isPlaying()) {
                    mediaPlayer.start();//开始播放
                }
                break;
            case R.id.button_pause:
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.pause();//暂停播放
                }
                break;
            case R.id.button_stop:
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.stop();//停止播放
                }
                break;
                default:
                    break;
        }

    }

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

二、播放视频

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private VideoView videoView;
    private Button button_play;
    private Button button_pause;
    private Button button_replay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        videoView = findViewById(R.id.videoView);
        button_play = findViewById(R.id.button_play);
        button_pause = findViewById(R.id.button_pause);
        button_replay = findViewById(R.id.button_replay);
        button_play.setOnClickListener(this);
        button_pause.setOnClickListener(this);
        button_replay.setOnClickListener(this);

        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 {
            initVideoPath();//初始化VideoView
        }

    }

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

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {

        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0]== PackageManager.
                        PERMISSION_GRANTED) {
                    initVideoPath();
                }else {
                    Toast.makeText(this,"拒绝权限将无法使用",Toast.LENGTH_SHORT).show();
                }
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button_play:
                videoView.start();//开始播放视频
                break;
            case R.id.button_pause:
                videoView.pause();//暂停视频
                break;
            case R.id.button_replay:
                videoView.resume();//重新播放shipin
                break;
                default:
                    break;
        }

    }

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

三、更高级的音频播放（为音频播放设置播放暂停的转换按钮）

public class MainActivity extends AppCompatActivity {

    Button button1;
    Button button2;
    Button button3;

    private boolean isPause = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button1 = findViewById(R.id.button);
        button2 = findViewById(R.id.button2);
        button3 = findViewById(R.id.button3);

        final MediaPlayer mediaPlayer =   new MediaPlayer().create(this, sound);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mediaPlayer.start();
            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mediaPlayer.stop();
            }
        });
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mediaPlayer.pause();
            }
        });

        final ImageButton imageButton = findViewById(R.id.imageButton);
        final ImageButton imageButton1 = findViewById(R.id.imageButton2);

        imageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(mediaPlayer.isPlaying() && !isPause){
                    mediaPlayer.pause();
                    isPause  = true;
                    ((ImageButton)v).setImageDrawable(getResources().getDrawable(R.drawable.ic_play_circle_outline_black_24dp,null));
                }else {
                    mediaPlayer.start();
                    isPause = false;
                    ((ImageButton)v).setImageDrawable(getResources().getDrawable(R.drawable.ic_pause_circle_outline_black_24dp,null));
                }
            }
        });

        imageButton1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                mediaPlayer.stop();
                isPause = false;
                imageButton.setImageDrawable(getResources().getDrawable(R.drawable.ic_play_circle_outline_black_24dp));
            }
        });
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                mediaPlayer.reset();
                try {
                    mediaPlayer.setDataSource(String.valueOf(sound));
                    mediaPlayer.prepare();//进行预加载
                    mediaPlayer.start();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}