Android 多媒體開發視訊播放

在main.xml布局檔案添加用于視訊畫面繪制的SurfaceView 控件：

SurfaceView surfaceView = (SurfaceView)this.findViewById(R.id.surfaceView);

surfaceView.getHolder().setFixedSize(176, 144); //設定分辨率

surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

MediaPlayer mediaPlayer = new MediaPlayer();

mediaPlayer.reset();//重置為初始狀态

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

mediaPlayer.setDisplay(surfaceView.getHolder());

mediaPlayer.setDataSource("/mnt/sdcard/oppo.mp4");

mediaPlayer.prepare();

mediaPlayer.start();//播放

mediaPlayer.pause();//暫停播放

mediaPlayer.start();//恢複播放

mediaPlayer.stop();//停止播放

mediaPlayer.release();//釋放資源

package cn.itcast.video;

import java.io.IOException;

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageButton;

public class VideoActivity extends Activity {
    private static final String TAG = "VideoActivity";
    private EditText filenameText;
    private SurfaceView surfaceView;
    private MediaPlayer mediaPlayer;
    private String filename;//目前播放檔案的名稱
    private int position;//記錄播放位置
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);  
        
        this.mediaPlayer = new MediaPlayer();
        this.filenameText = (EditText) this.findViewById(R.id.filename);
        this.surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);
        ImageButton playButton = (ImageButton) this.findViewById(R.id.play);
        ImageButton pauseButton = (ImageButton) this.findViewById(R.id.pause);
        ImageButton resetButton = (ImageButton) this.findViewById(R.id.reset);
        ImageButton stopButton = (ImageButton) this.findViewById(R.id.stop);
        
        ButtonClickListener listener = new ButtonClickListener();   
        playButton.setOnClickListener(listener);
        pauseButton.setOnClickListener(listener);
        resetButton.setOnClickListener(listener);
        stopButton.setOnClickListener(listener);

        /*下面設定Surface不維護自己的緩沖區，而是等待螢幕的渲染引擎将内容推送到使用者面前*/
        this.surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        this.surfaceView.getHolder().setFixedSize(176, 144);//設定分辨率
        this.surfaceView.getHolder().setKeepScreenOn(true);
        this.surfaceView.getHolder().addCallback(new SurfaceListener());
    }

    private class ButtonClickListener implements View.OnClickListener{
	@Override
	public void onClick(View v) {
		try {
			switch (v.getId()) {
			case R.id.play://來自播放按鈕
				filename = filenameText.getText().toString();
				play();
				break;

			case R.id.pause://來自暫停按鈕
				if(mediaPlayer.isPlaying()){
					mediaPlayer.pause();
				}else{
					mediaPlayer.start();
				}
				break;
					
			case R.id.reset://來自重新播放按鈕
				if(!mediaPlayer.isPlaying()) play();
				mediaPlayer.seekTo(0);
				break;
					
			case R.id.stop://來自停止按鈕
				if(mediaPlayer.isPlaying()) mediaPlayer.stop();
				break;					
			}
		} catch (Exception e) {
			Log.e(TAG, e.toString());
		}
	}
    }
    /**
     * 播放視訊
     */
    private void play() throws IOException {
	mediaPlayer.reset();
	mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
	mediaPlayer.setDataSource("/mnt/sdcard/"+ filename);//設定需要播放的視訊
	mediaPlayer.setDisplay(surfaceView.getHolder());//把視訊畫面輸出到SurfaceView
	mediaPlayer.prepare();
	mediaPlayer.start();
    }
	
    private class SurfaceListener implements SurfaceHolder.Callback{
	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
	}
	@Override
	public void surfaceCreated(SurfaceHolder holder) {//方法在onResume()後被調用
		Log.i(TAG, "surfaceCreated()");
		if(position>0 && filename!=null){
			try {
				play();
				mediaPlayer.seekTo(position);
				position = 0;
			} catch (Exception e) {
				Log.e(TAG, e.toString());
			}
		}
	}
	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		Log.i(TAG, "surfaceDestroyed()");
	}    	
    }
    
    @Override
    protected void onPause() {//當其他Activity被打開，停止播放
	if(mediaPlayer.isPlaying()){
		position = mediaPlayer.getCurrentPosition();//得到播放位置
		mediaPlayer.stop();
	}
	super.onPause();
    }	
    
    @Override
    protected void onDestroy() {
	if(mediaPlayer.isPlaying()) mediaPlayer.stop();
	mediaPlayer.release();
	super.onDestroy();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="#FFFFFF"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/filename"
    />
 <EditText  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="oppo.mp4"
    android:id="@+id/filename"
    />
  <LinearLayout
     android:orientation="horizontal"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
    >
  <ImageButton
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@drawable/play"
    android:id="@+id/play"
    />
<ImageButton
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@drawable/pause"
    android:id="@+id/pause"
    />
<ImageButton
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@drawable/reset"
    android:id="@+id/reset"
    />
<ImageButton
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:src="@drawable/stop"
    android:id="@+id/stop"
    />
  </LinearLayout>
  <SurfaceView
    android:layout_width="fill_parent" 
    android:layout_height="240dip"
    android:id="@+id/surfaceView"
    />
</LinearLayout>

示例代碼：

DemoActivity.java:

package cn.itcast.videoplayer;

import java.io.File;

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class DemoActivity extends Activity implements OnClickListener {
	private EditText et_path;
	private Button bt_start, bt_pause, bt_restart, bt_stop;
	private SurfaceView sv;
	private SurfaceHolder holder;
	MediaPlayer mediaPlayer;
	boolean ispause = false;
	int position = 0;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		et_path = (EditText) this.findViewById(R.id.et_path);
		bt_start = (Button) this.findViewById(R.id.bt_start);
		bt_pause = (Button) this.findViewById(R.id.bt_pause);
		bt_restart = (Button) this.findViewById(R.id.bt_restart);
		bt_stop = (Button) this.findViewById(R.id.bt_stop);

		bt_start.setOnClickListener(this);
		bt_pause.setOnClickListener(this);
		bt_restart.setOnClickListener(this);
		bt_stop.setOnClickListener(this);
		sv = (SurfaceView) this.findViewById(R.id.sv);

		// 視訊播放的填充器
		holder = sv.getHolder();
		/* 下面設定Surface不維護自己的緩沖區，而是等待螢幕的渲染引擎将内容推送到使用者面前 */
		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		// holder.setFixedSize(width, height);
		holder.addCallback(new MyHolderCallback());
	}

	@Override
	protected void onStart() {
		// TODO Auto-generated method stub
		// 背景繼續播放 回到 前台 仍然能看到畫面
		super.onStart();
	}

	private class MyHolderCallback implements SurfaceHolder.Callback {
		public void surfaceCreated(SurfaceHolder holder) {
			System.out.println("holder 被建立 ");
			// 當視訊播放最小化之後 下一次 必須在holder被建立後 再去播放視訊
			if (position > 0) {
				String path = et_path.getText().toString().trim();
				try {
					// 重新設定顯示的holder
					DemoActivity.this.holder = holder;
					play(path, position);
				} catch (Exception e) {
					Toast.makeText(getApplicationContext(), "播放出現異常", 0).show();
					e.printStackTrace();
				}
			}
		}

		public void surfaceChanged(SurfaceHolder holder, int format, int width,
				int height) {
			// TODO Auto-generated method stub
		}

		public void surfaceDestroyed(SurfaceHolder holder) {
			System.out.println("holder 被銷毀 ");
			// 記錄最小化之後播放器播放的位置
			if (mediaPlayer != null && mediaPlayer.isPlaying()) {
				position = mediaPlayer.getCurrentPosition();
				mediaPlayer.stop();
				mediaPlayer.release();
				mediaPlayer = null;
			}
		}
	}

	public void onClick(View v) {
		String path = et_path.getText().toString().trim();
		try {
			switch (v.getId()) {
			case R.id.bt_start:
				play(path, 0);
				break;
			case R.id.bt_restart:
				if (mediaPlayer != null && mediaPlayer.isPlaying()) {
					mediaPlayer.seekTo(0);
				} else {
					play(path, 0);
				}
				break;
			case R.id.bt_stop:
				if (mediaPlayer != null && mediaPlayer.isPlaying()) {
					mediaPlayer.stop();
					mediaPlayer.release();
					mediaPlayer = null;
					bt_start.setEnabled(true);
				}
				break;
			case R.id.bt_pause:
				pause();
				break;
			}
		} catch (Exception e) {
			e.printStackTrace();
			Toast.makeText(this, "視訊播放失敗", 0).show();
		}

	}

	private void pause() {
		if (mediaPlayer != null && mediaPlayer.isPlaying()) {
			mediaPlayer.pause();
			bt_pause.setText("☺");
			ispause = true;
			return;
		}
		if (mediaPlayer != null && ispause) {
			mediaPlayer.start();
			bt_pause.setText("‖");
			ispause = false;
		}
	}

	/**
	 * 根據路徑 進行播放
	 * 
	 * @param path
	 */
	private void play(String path, int position) throws Exception {
		if ("".equals(path)) {
			Toast.makeText(this, "路徑不能為空", 0).show();
			return;
		}
		File file = new File(path);
		if (file.exists()) {
			mediaPlayer = new MediaPlayer();
			mediaPlayer.setDataSource(path);
			mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
			mediaPlayer.setDisplay(holder);
			// 播放視訊之前必須要初始化 視訊的播放器
			mediaPlayer.prepare();
			mediaPlayer.start();
			mediaPlayer.seekTo(position);
			bt_start.setEnabled(false);
			mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
				public void onCompletion(MediaPlayer mp) {
					mediaPlayer.release();
					mediaPlayer = null;
					bt_start.setEnabled(true);
				}
			});
			// 當播放出現錯誤的時候的回調方法
			mediaPlayer.setOnErrorListener(new OnErrorListener() {
				public boolean onError(MediaPlayer mp, int what, int extra) {
					mp.release();
					mediaPlayer = null;
					bt_start.setEnabled(true);
					return false;
				}
			});

		} else {
			Toast.makeText(this, "檔案不存在", 0).show();
			return;
		}
	}
}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="請輸入視訊的路徑" />

    <EditText
        android:id="@+id/et_path"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="mnt/sdcard/oop.mp4" />

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

        <Button
            android:id="@+id/bt_start"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="＞" />

        <Button
            android:id="@+id/bt_pause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="‖" />

        <Button
            android:id="@+id/bt_restart"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="◎" />

        <Button
            android:id="@+id/bt_stop"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="■" />
    </LinearLayout>

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

</LinearLayout>

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