android(42)（音乐播放器，视频播放器）

1.音乐播放器：
布局文件：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_path"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入要播放文件的路径" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/bt_play"
            android:onClick="play"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="播放" />
        <Button
              android:id="@+id/bt_pause"
            android:onClick="pause"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="暂停" />
        <Button
              android:id="@+id/bt_stop"
            android:onClick="stop"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="停止" />
        <Button
              android:id="@+id/bt_replay"
            android:onClick="replay"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="重播" />
    </LinearLayout>

</LinearLayout>
业务逻辑代码：
public class MainActivity extends Activity {
    private EditText et_path;

    private MediaPlayer mediaPlayer;

    private Button bt_play,bt_pause,bt_stop,bt_replay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_path = (EditText) findViewById(R.id.et_path);
        bt_play = (Button) findViewById(R.id.bt_play);
        bt_pause = (Button) findViewById(R.id.bt_pause);
        bt_stop = (Button) findViewById(R.id.bt_stop);
        bt_replay = (Button) findViewById(R.id.bt_replay);
    }
    /** * 播放 * @param view */
    public void play(View view) {
        String filepath = et_path.getText().toString().trim();
        File file = new File(filepath);
        if(file.exists()){
            try {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
                mediaPlayer.start();
                bt_play.setEnabled(false);
                mediaPlayer.setOnCompletionListener(new OnCompletionListener() {//设置完成的监听
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        bt_play.setEnabled(true);//可以点击
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(this, "播放失败", 0).show();
            }
        }else{
            Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();
        }
    }
    /** * 暂停 * @param view */
    public void pause(View view) {
        if("继续".equals(bt_pause.getText().toString())){
            mediaPlayer.start();
            bt_pause.setText("暂停");
            return;
        }
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            bt_pause.setText("继续");
        }
    }
    /** * 停止 * @param view */
    public void stop(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
        bt_pause.setText("暂停");
        bt_play.setEnabled(true);
    }
    /** * 重播 * @param view */
    public void replay(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.seekTo(0);//搜索到第0帧也就是从头开始播放
        }else{
            play(view);
        }
        bt_pause.setText("暂停");
    }

}
2.网络音乐播放器：
业务逻辑代码：
public class MainActivity extends Activity {
    private EditText et_path;

    private MediaPlayer mediaPlayer;

    private Button bt_play,bt_pause,bt_stop,bt_replay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_path = (EditText) findViewById(R.id.et_path);
        bt_play = (Button) findViewById(R.id.bt_play);
        bt_pause = (Button) findViewById(R.id.bt_pause);
        bt_stop = (Button) findViewById(R.id.bt_stop);
        bt_replay = (Button) findViewById(R.id.bt_replay);
    }
    /** * 播放 * @param view */
    public void play(View view) {
        String filepath = et_path.getText().toString().trim();
        //http://
        if(filepath.startsWith("http://")){
            try {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                //mediaPlayer.prepare();//同步的准备方法。
                mediaPlayer.prepareAsync();//异步的准备
                mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
                    @Override
                    public void onPrepared(MediaPlayer mp) {
                        mediaPlayer.start();
                        bt_play.setEnabled(false);
                    }
                });
                mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        bt_play.setEnabled(true);
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(this, "播放失败", 0).show();
            }
        }else{
            Toast.makeText(this, "请检查文件的路径", 0).show();
        }
    }
    /** * 暂停 * @param view */
    public void pause(View view) {
        if("继续".equals(bt_pause.getText().toString())){
            mediaPlayer.start();
            bt_pause.setText("暂停");
            return;
        }
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            bt_pause.setText("继续");
        }
    }
    /** * 停止 * @param view */
    public void stop(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
        bt_pause.setText("暂停");
        bt_play.setEnabled(true);
    }
    /** * 重播 * @param view */
    public void replay(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.seekTo(0);
        }else{
            play(view);
        }
        bt_pause.setText("暂停");
    }

}
3.视频播放器：
布局文件：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_path"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入要播放文件的路径" />

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/bt_play"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="play"
            android:text="播放" />

        <Button
            android:id="@+id/bt_pause"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="pause"
            android:text="暂停" />

        <Button
            android:id="@+id/bt_stop"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="stop"
            android:text="停止" />

        <Button
            android:id="@+id/bt_replay"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="replay"
            android:text="重播" />
    </LinearLayout>

    <SurfaceView
        android:id="@+id/sv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>
业务逻辑代码：
public class MainActivity extends Activity {
    private EditText et_path;
    private MediaPlayer mediaPlayer;

    private Button bt_play,bt_pause,bt_stop,bt_replay;

    private SurfaceView sv;
    private SurfaceHolder holder;

    private int position;
    private String filepath;

    private SeekBar seekBar1;//进度条

    private Timer timer;//计时器
    private TimerTask task;//TimerTask是一个实现了Runnable接口的抽象类，代表一个可以被Timer执行的任务

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_path = (EditText) findViewById(R.id.et_path);
        bt_play = (Button) findViewById(R.id.bt_play);
        bt_pause = (Button) findViewById(R.id.bt_pause);
        bt_stop = (Button) findViewById(R.id.bt_stop);
        bt_replay = (Button) findViewById(R.id.bt_replay);

        seekBar1 = (SeekBar) findViewById(R.id.seekBar1);
        seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {//设置进度改变的监听器

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {//停止追踪
                int postion = seekBar.getProgress();
                mediaPlayer.seekTo(postion);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {

            }
        });

        //得到surfaceview
        sv = (SurfaceView) findViewById(R.id.sv);
        //得到显示界面内容的容器
        holder = sv.getHolder();
        //在低版本模拟器上运行记得加上下面的参数。不自己维护双缓冲区，而是等待多媒体播放框架主动的推送数据。
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        holder.addCallback(new Callback() {

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                System.out.println("destoryed");
                if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
                    position = mediaPlayer.getCurrentPosition();
                    mediaPlayer.stop();
                    mediaPlayer.release();
                    mediaPlayer = null;
                    timer.cancel();
                    task.cancel();
                    timer = null;
                    task = null;
                }
            }

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                System.out.println("created");
                if(position>0){//记录的有播放进度。
                    try {
                        mediaPlayer = new MediaPlayer();
                        mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                        mediaPlayer.setDisplay(holder);
                        mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
                        mediaPlayer.start();
                        mediaPlayer.seekTo(position);
                        bt_play.setEnabled(false);
                        mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                            @Override
                            public void onCompletion(MediaPlayer mp) {
                                bt_play.setEnabled(true);
                            }
                        });
                        int max = mediaPlayer.getDuration();//得到持续时间
                        seekBar1.setMax(max);
                        timer = new Timer();
                        task = new TimerTask() {
                            @Override
                            public void run() {
                                seekBar1.setProgress(mediaPlayer.getCurrentPosition());
                            }
                        };
                        timer.schedule(task, 0, 500);//schedule:安排计划
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width,
                    int height) {
                System.out.println("changed");
            }
        });

    }
    /** * 播放 * @param view */
    public void play(View view) {
        filepath = et_path.getText().toString().trim();
        File file = new File(filepath);
        if(file.exists()){
            try {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mediaPlayer.setDisplay(holder);
                mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
                mediaPlayer.start();
                //设置拖动进度条的最大值
                int max = mediaPlayer.getDuration();
                seekBar1.setMax(max);
                timer = new Timer();
                task = new TimerTask() {
                    @Override
                    public void run() {
                        seekBar1.setProgress(mediaPlayer.getCurrentPosition());
                    }
                };
                timer.schedule(task, 0, 500);

                bt_play.setEnabled(false);
                mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        bt_play.setEnabled(true);
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(this, "播放失败", 0).show();
            }
        }else{
            Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();
        }
    }
    /** * 暂停 * @param view */
    public void pause(View view) {
        if("继续".equals(bt_pause.getText().toString())){
            mediaPlayer.start();
            bt_pause.setText("暂停");
            return;
        }
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            bt_pause.setText("继续");
        }
    }
    /** * 停止 * @param view */
    public void stop(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
        bt_pause.setText("暂停");
        bt_play.setEnabled(true);
    }
    /** * 重播 * @param view */
    public void replay(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.seekTo(0);
        }else{
            play(view);
        }
        bt_pause.setText("暂停");
    }

}
4.public class MainActivity extends Activity {
    private EditText et_path;

    private MediaPlayer mediaPlayer;

    private Button bt_play,bt_pause,bt_stop,bt_replay;

    private SurfaceView sv;
    private SurfaceHolder holder;

    private int position;
    private String filepath;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_path = (EditText) findViewById(R.id.et_path);
        bt_play = (Button) findViewById(R.id.bt_play);
        bt_pause = (Button) findViewById(R.id.bt_pause);
        bt_stop = (Button) findViewById(R.id.bt_stop);
        bt_replay = (Button) findViewById(R.id.bt_replay);
        //得到surfaceview
        sv = (SurfaceView) findViewById(R.id.sv);
        //得到显示界面内容的容器
        holder = sv.getHolder();
        //在低版本模拟器上运行记得加上下面的参数。不自己维护双缓冲区，而是等待多媒体播放框架主动的推送数据。
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        holder.addCallback(new Callback() {

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                System.out.println("destoryed");
                if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
                    position = mediaPlayer.getCurrentPosition();
                    mediaPlayer.stop();
                    mediaPlayer.release();
                    mediaPlayer = null;
                }
            }

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                System.out.println("created");
                if(position>0){//记录的有播放进度。
                    try {
                        mediaPlayer = new MediaPlayer();
                        mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                        mediaPlayer.setDisplay(holder);
                        mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
                        mediaPlayer.start();
                        mediaPlayer.seekTo(position);
                        bt_play.setEnabled(false);
                        mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                            @Override
                            public void onCompletion(MediaPlayer mp) {
                                bt_play.setEnabled(true);
                            }
                        });
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width,
                    int height) {
                System.out.println("changed");
            }
        });

    }
    /** * 播放 * @param view */
    public void play(View view) {
        filepath = et_path.getText().toString().trim();
        //File file = new File(filepath);
        if(filepath.startsWith("http://")){
            try {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setDataSource(filepath);//设置播放的数据源。
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mediaPlayer.setDisplay(holder);
                mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
                mediaPlayer.start();
                bt_play.setEnabled(false);
                mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        bt_play.setEnabled(true);
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
                Toast.makeText(this, "播放失败", 0).show();
            }
        }else{
            Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();
        }
    }
    /** * 暂停 * @param view */
    public void pause(View view) {
        if("继续".equals(bt_pause.getText().toString())){
            mediaPlayer.start();
            bt_pause.setText("暂停");
            return;
        }
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            bt_pause.setText("继续");
        }
    }
    /** * 停止 * @param view */
    public void stop(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.stop();
            mediaPlayer.release();
            mediaPlayer = null;
        }
        bt_pause.setText("暂停");
        bt_play.setEnabled(true);
    }
    /** * 重播 * @param view */
    public void replay(View view) {
        if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
            mediaPlayer.seekTo(0);
        }else{
            play(view);
        }
        bt_pause.setText("暂停");
    }

}