18-音乐视频播放

原创 于 2014-08-08 22:40:48 发布 · 383 阅读 · 0 ·
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本文介绍了如何在Android平台上实现音乐和视频播放器的基本功能，包括文件路径读取、播放控制（播放、暂停、重播、停止）、以及缓冲与显示视频画面。详细展示了通过MediaPlayer和SurfaceView组件操作多媒体资源。

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1、音乐播放

MainActivity 

package cn.itcast.mp3;

import java.io.File;

import android.app.Activity;
import android.content.Context;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText nameText;
    private String path;
    private MediaPlayer mediaPlayer;
    private boolean pause;
    private int position;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mediaPlayer = new MediaPlayer();
        nameText = (EditText) this.findViewById(R.id.filename);
        
        TelephonyManager telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(new MyPhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);
    }
    
    private final class MyPhoneListener extends PhoneStateListener{
		public void onCallStateChanged(int state, String incomingNumber) {
			switch (state) {
			case TelephonyManager.CALL_STATE_RINGING://来电
				if(mediaPlayer.isPlaying()) {
					position = mediaPlayer.getCurrentPosition();
					mediaPlayer.stop();
				}
				break;

			case TelephonyManager.CALL_STATE_IDLE:
				if(position>0 && path!=null){
					play(position);
					position = 0;
				}
				break;
			}
		}
    }
    /*  不建议这种方式来控制电话暂停，不能后台播放
    @Override
	protected void onPause() {
		if(mediaPlayer.isPlaying()) {
			position = mediaPlayer.getCurrentPosition();
			mediaPlayer.stop();
		}
		super.onPause();
	}

	@Override
	protected void onResume() {
		if(position>0 && path!=null){
			play(position);
			position = 0;
		}
		super.onResume();
	}
*/
	@Override
	protected void onDestroy() {
    	mediaPlayer.release();
    	mediaPlayer = null;
		super.onDestroy();
	}

	public void mediaplay(View v){
    	switch (v.getId()) {
		case R.id.playbutton:
			String filename = nameText.getText().toString();
			File audio = new File(Environment.getExternalStorageDirectory(), filename);
			if(audio.exists()){
				path = audio.getAbsolutePath();
				play(0);
			}else{
				path = null;
				Toast.makeText(getApplicationContext(), R.string.filenoexist, 1).show();
			}
			break;
			
		case R.id.pausebutton:
			if(mediaPlayer.isPlaying()){
				mediaPlayer.pause();//暂停
				pause = true;
				((Button)v).setText(R.string.continues);
			}else{
				if(pause){
					mediaPlayer.start();//继续播放
					pause = false;
					((Button)v).setText(R.string.pausebutton);
				}
			}
			break;
		case R.id.resetbutton:
			if(mediaPlayer.isPlaying()){
				mediaPlayer.seekTo(0);//从开始位置播放音乐
			}else{
				if(path!=null){
					play(0);
				}
			}
			break;
		case R.id.stopbutton:	
			if(mediaPlayer.isPlaying()) mediaPlayer.stop();
			break;
		}
    }

	private void play(int position) {
		try {
			mediaPlayer.reset();//把各项参数恢复到初始状态
			mediaPlayer.setDataSource(path);
			mediaPlayer.prepare();//进行缓冲
			mediaPlayer.setOnPreparedListener(new PrepareListener(position));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private final class PrepareListener implements OnPreparedListener{
		private int position;
		public PrepareListener(int position) {
			this.position = position;
		}

		public void onPrepared(MediaPlayer mp) {
			mediaPlayer.start();//开始播放
			if(position>0) mediaPlayer.seekTo(position);
		}
	}
}

配置  main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    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="a.mp3"
    android:id="@+id/filename"
    />
    
    <LinearLayout
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >
    	<Button
    	 android:layout_width="wrap_content"
	     android:layout_height="wrap_content"
	     android:text="@string/playbutton"
	     android:onClick="mediaplay"
	     android:id="@+id/playbutton"
	     />
		<Button
    	 android:layout_width="wrap_content"
	     android:layout_height="wrap_content"
	     android:text="@string/pausebutton"
	     android:onClick="mediaplay"
	     android:id="@+id/pausebutton"
	     />    
    	<Button
    	 android:layout_width="wrap_content"
	     android:layout_height="wrap_content"
	     android:text="@string/resetbutton"
	     android:onClick="mediaplay"
	     android:id="@+id/resetbutton"
	     />
		<Button
    	 android:layout_width="wrap_content"
	     android:layout_height="wrap_content"
	     android:text="@string/stopbutton"
	     android:onClick="mediaplay"
	     android:id="@+id/stopbutton"
	     />       
    </LinearLayout>
</LinearLayout>

配置  string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">音乐播放器</string>
    <string name="filename">音乐文件名称</string>
    <string name="playbutton">播放</string>
    <string name="pausebutton">暂停</string>
    <string name="resetbutton">重播</string>
    <string name="stopbutton">停止</string>
    <string name="filenoexist">文件没有发现</string>
    <string name="continues">继续</string>
</resources>

主配置  /audioplayer/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.itcast.mp3"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="8" />
  <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>   
  <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
</manifest>


2、视频播放

package cn.itcast.videoplayer;

import java.io.File;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
    private EditText nameText;
    private String path;
    private MediaPlayer mediaPlayer;
    private SurfaceView surfaceView;
    private boolean pause;
    private int position;
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mediaPlayer = new MediaPlayer();
        nameText = (EditText) this.findViewById(R.id.filename);
        surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);
        //把输送给surfaceView的视频画面，直接显示到屏幕上,不要维持它自身的缓冲区
        surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        surfaceView.getHolder().setFixedSize(176, 144);
        surfaceView.getHolder().setKeepScreenOn(true);
        surfaceView.getHolder().addCallback(new SurfaceCallback());
    }
    
    private final class SurfaceCallback implements Callback{
		public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
		}
		public void surfaceCreated(SurfaceHolder holder) {
			if(position>0 && path!=null){
				play(position);
				position = 0;
			}
		}
		public void surfaceDestroyed(SurfaceHolder holder) {
			if(mediaPlayer.isPlaying()){
				position = mediaPlayer.getCurrentPosition();
				mediaPlayer.stop();
			}
		}
    }

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

	public void mediaplay(View v){
    	switch (v.getId()) {
		case R.id.playbutton:
			String filename = nameText.getText().toString();
			if(filename.startsWith("http")){
				path = filename;
				play(0);
			}else{
				File file = new File(Environment.getExternalStorageDirectory(), filename);
				if(file.exists()){
					path = file.getAbsolutePath();
					play(0);
				}else{
					path = null;
					Toast.makeText(this, R.string.filenoexsit, 1).show();
				}
			}
		
			break;

		case R.id.pausebutton:
			if(mediaPlayer.isPlaying()){
				mediaPlayer.pause();
				pause = true;
			}else{
				if(pause){
					mediaPlayer.start();
					pause = false;
				}
			}
			break;
			
		case R.id.resetbutton:
			if(mediaPlayer.isPlaying()){
				mediaPlayer.seekTo(0);
			}else{
				if(path!=null){
					play(0);
				}
			}
			break;
		case R.id.stopbutton:
			if(mediaPlayer.isPlaying()){
				mediaPlayer.stop();
			}
			break;
		}
    }

	private void play(int position) {
		try {
			mediaPlayer.reset();
			mediaPlayer.setDataSource(path);
			mediaPlayer.setDisplay(surfaceView.getHolder());
			mediaPlayer.prepare();//缓冲
			mediaPlayer.setOnPreparedListener(new PrepareListener(position));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private final class PrepareListener implements OnPreparedListener{
		private int position;
		
		public PrepareListener(int position) {
		     this.position = position;
		}

		public void onPrepared(MediaPlayer mp) {
			mediaPlayer.start();//播放视频
			if(position>0) mediaPlayer.seekTo(position);
		}
	}
}
/videoplayer/bin/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.itcast.videoplayer"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    <uses-sdk android:minSdkVersion="5" />
<!-- 访问internet权限 -->
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>   
  <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
</manifest>
/videoplayer/res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF"
    >
<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: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/playbutton"
    	 android:onClick="mediaplay"
    	/>
    	<ImageButton
    	 android:layout_width="wrap_content"
    	 android:layout_height="wrap_content"
    	 android:src="@drawable/pause"
    	 android:id="@+id/pausebutton"
    	 android:onClick="mediaplay"
    	/>
    	<ImageButton
    	 android:layout_width="wrap_content"
    	 android:layout_height="wrap_content"
    	 android:src="@drawable/reset"
    	 android:id="@+id/resetbutton"
    	 android:onClick="mediaplay"
    	/>
    	<ImageButton
    	 android:layout_width="wrap_content"
    	 android:layout_height="wrap_content"
    	 android:src="@drawable/stop"
    	 android:id="@+id/stopbutton"
    	 android:onClick="mediaplay"
    	/>    	    	    
    </LinearLayout>
    
    <SurfaceView
    	 android:layout_width="fill_parent"
    	 android:layout_height="240dp"
    	android:id="@+id/surfaceView"
    	/>
</LinearLayout>
/videoplayer/res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, MainActivity!</string>
    <string name="app_name">视频播放器</string>
    <string name="filename">视频文件名称</string>
    <string name="filenoexsit">视频文件不存在</string>
</resources>
在线视频与本地一样但必须是流媒体格式
 //要播放互联网上的流媒体，渐进式用http或者是ftp  3gp和实时则RT或RTSP

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