安卓学习-媒体播放

于 2016-04-12 01:10:00 发布
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CC 4.0 BY-SA版权
文章标签： 移动开发 java python
原文链接：https://my.oschina.net/xiaofeiandroid/blog/657086

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image

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案例：image

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.mediaplayer.MainActivity">


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="播放本地资源文件"
        android:onClick="playFromRes"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="播放系统文件"
        android:onClick="playFromSys"
        android:id="@+id/button2"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignRight="@+id/button"
        android:layout_alignEnd="@+id/button" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="播放网络文件"
        android:id="@+id/button3"
        android:onClick="playFromNet"
        android:layout_below="@+id/button2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignRight="@+id/button2"
        android:layout_alignEnd="@+id/button2" />
</RelativeLayout>
package com.example.administrator.mediaplayer;

import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

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


    //播放本地资源文件
    public void playFromRes(View view)
    {
        MediaPlayer mp=MediaPlayer.create(this,R.raw.mjx);
        mp.start();

    }

    //播放系统文件
    public void playFromSys(View view)
    {

        MediaPlayer mp=new MediaPlayer();
        String path= Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC)+"/xpg.mp3";
        try {
            //设置数据源
            mp.setDataSource(this, Uri.parse(path));
            mp.prepare();//同步执行
            mp.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void playFromNet(View view)
    {
        String path="http://music.baidutt.com/up/kwcywucc/awmkw.mp3";
        MediaPlayer mp=new MediaPlayer();
        try {
            mp.setDataSource(this,Uri.parse(path));
            mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mp.start();
                }
            });
            mp.prepareAsync();

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

MediaPlayer State diagramimageimage

image

案例：image

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"

    tools:context="com.example.administrator.mediaplayer.MainActivity2">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:src="@mipmap/yinyue" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="上一首"
        android:id="@+id/button_last"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="下一首"
        android:id="@+id/button_next"
        android:layout_alignTop="@+id/button_pause"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="播放"
        android:id="@+id/button_play"
        android:layout_alignTop="@+id/button_last"
        android:layout_alignLeft="@+id/imageView"
        android:layout_alignStart="@+id/imageView" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="暂停"
        android:id="@+id/button_pause"
        android:layout_alignTop="@+id/button_play"
        android:layout_toRightOf="@+id/button_play"
        android:layout_toEndOf="@+id/button_play" />
</RelativeLayout>

MainActivity.java

package com.example.administrator.mediaplayer;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

/*简单的播放器实现*/
public class MainActivity2 extends
        AppCompatActivity implements View.OnClickListener,
        MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener,
        MediaPlayer.OnCompletionListener {

    private MediaPlayer mp;
    private int index = 0;//表示当前要播放音乐的索引
    private Button button_play;
    private Button button_pause;
    private Button button_last;
    private Button button_next;
    private boolean isPause = false;//true表示暂停状态，false表示重头开始播
    private ArrayList<String> musicList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        initView();
        initMusic();
        mp = new MediaPlayer();
        mp.setOnPreparedListener(this);
        mp.setOnErrorListener(this);
        mp.setOnCompletionListener(this);


    }

    private void initView() {
        button_play = (Button) findViewById(R.id.button_play);
        button_pause = (Button) findViewById(R.id.button_pause);
        button_last = (Button) findViewById(R.id.button_last);
        button_next = (Button) findViewById(R.id.button_next);
        button_play.setOnClickListener(this);
        button_pause.setOnClickListener(this);
        button_last.setOnClickListener(this);
        button_next.setOnClickListener(this);
    }


    private void initMusic() {
        String root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC).getPath();

        musicList.add(root + File.separator + "bjsq.mp3");
        musicList.add(root + File.separator + "greenbird.mp3");
        musicList.add(root + File.separator + "mjx.mp3");
        musicList.add(root + File.separator + "xpg.mp3");
        musicList.add(root + File.separator + "zzlfz.mp3");
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button_play:
                play();
                break;
            case R.id.button_pause:
                pause();
                break;
            case R.id.button_last:
                last();
                break;
            case R.id.button_next:
                next();
                break;
            default:
                break;
        }
    }

    //播放
    private void play() {
        if (isPause) {
            mp.start();
            isPause = false;
        } else {
            start();
        }

    }

    //暂停
    private void pause() {
        if (mp.isPlaying()) {
            mp.pause();
            isPause = true;
        }
    }

    //上一首
    private void last() {
        if (index - 1 >= 0) {
            index--;
        } else {
            index = musicList.size() - 1;
        }
        start();
    }

    //下一首
    private void next() {
        if (index + 1 <= musicList.size() - 1) {
            index++;
        } else {
            index = 0;
        }
        start();
    }

    /*重头开始播放音乐*/
    private void start() {
        if (index < musicList.size()) {
            if (mp.isPlaying()) {
                mp.stop();
            }
            mp.reset();//重置
            String musicpath = musicList.get(index);
            try {
                mp.setDataSource(musicpath);
                mp.prepareAsync();
                isPause = false;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

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

    @Override
    public void onPrepared(MediaPlayer mp) {
        mp.start();
    }

    @Override
    public boolean onError(MediaPlayer mp, int what, int extra) {
        mp.reset();

        return true;
    }


    @Override
    public void onCompletion(MediaPlayer mp) {
        next();
    }


}

 

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image

点击播放image点击通知imageimage

<service
    android:name=".MusicService"
    android:enabled="true"
    android:exported="true"
    android:process=":music">

    <intent-filter >
        <action android:name="com.example.ACTION_PLAY"></action>
        <action android:name="com.example.ACTION_PAUSE"></action>
        <action android:name="com.example.ACTION_EXIT"></action>
    </intent-filter>

</service>

activity_main3.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.mediaplayer.MainActivity3">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="播放"
        android:id="@+id/button4"
        android:onClick="play"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="暂停"
        android:onClick="pause"
        android:id="@+id/button5"
        android:layout_below="@+id/button4"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="EXIT"
        android:onClick="exit"
        android:id="@+id/button6"
        android:layout_below="@+id/button5"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

MainActivity3.java

package com.example.administrator.mediaplayer;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity3 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
    }
    public void play(View view)
    {
         Intent intent=new Intent(MusicService.ACTION_PLAY);
        startService(intent);
    }
    public void pause(View view)
    {
        Intent intent=new Intent(MusicService.ACTION_PAUSE);
        startService(intent);
    }
    public void exit(View view)
    {
        Intent intent=new Intent(MusicService.ACTION_EXIT);
        startService(intent);
    }

    /*@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode==KeyEvent.KEYCODE_BACK)
        {


        }
        return super.onKeyDown(keyCode, event);
    }*/
}

MusicService.java

package com.example.administrator.mediaplayer;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.wifi.WifiManager;
import android.os.Environment;
import android.os.IBinder;
import android.os.PowerManager;

import java.io.File;
import java.io.IOException;

public class MusicService extends Service implements MediaPlayer.OnPreparedListener {

    public static final String ACTION_PLAY = "com.example.ACTION_PLAY";
    public static final String ACTION_PAUSE = "com.example.ACTION_PAUSE";
    public static final String ACTION_EXIT = "com.example.ACTION_EXIT";
    private WifiManager.WifiLock lock;
    private MediaPlayer mediaPlayer;

    public MusicService() {
    }


    @Override
    public void onCreate() {
        super.onCreate();
        mediaPlayer = new MediaPlayer();
        //保持CPU正常工作
        mediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
        //保持Wifi不被休眠
        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
         lock = wifiManager.createWifiLock("mylock");
        lock.acquire();
        mediaPlayer.setOnPreparedListener(this);
        notification();
    }
private void notification()
{
    Notification.Builder builder=new Notification.Builder(this);
    builder.setTicker("我的第一个音乐播放神器");
    builder.setSmallIcon(R.mipmap.yinyue);
    builder.setContentTitle("我的音乐神器");
    builder.setContentInfo("正在播放...");
    PendingIntent pi=PendingIntent.getActivity(this,0,new Intent(this,MainActivity3.class),PendingIntent.FLAG_UPDATE_CURRENT);
    builder.setContentIntent(pi);
    NotificationManager nm= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    Notification notification=builder.build();

    startForeground(0,notification);
    nm.notify(0,notification);

}
    @Override
    public void onDestroy() {
        super.onDestroy();
        lock.release();
        stopForeground(true);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String action = intent.getAction();
        if (ACTION_PLAY.equals(action)) {
            mediaPlayer.reset();
            try {
                mediaPlayer.setDataSource(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC) + File.separator + "zzlfz.mp3");
                mediaPlayer.prepareAsync();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else if (ACTION_PAUSE.equals(action)) {
            if (mediaPlayer.isPlaying()) {
                mediaPlayer.pause();
            }
        } else if (ACTION_EXIT.equals(action)) {
            if (mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
            mediaPlayer.release();
        }
        return super.onStartCommand(intent, flags, startId);

    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }


    @Override
    public void onPrepared(MediaPlayer mp) {
        mp.start();
    }
}

<service
    android:name=".MusicService"
    android:enabled="true"
    android:exported="true"
    android:process=":music">
    <intent-filter>
        <action android:name="com.example.ACTION_PLAY" />
        <action android:name="com.example.ACTION_PAUSE" />
        <action android:name="com.example.ACTION_EXIT" />
        <action android:name="com.example.ACTION_STOP" />
    </intent-filter>
</service>

<receiver
    android:name=".MusicIntentReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
        <action android:name="android.media.AUDIO_BECOMING_NOISY"></action>
    </intent-filter>
</receiver>
代码改成：
MusicService.java
package com.example.administrator.mediaplayer;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.wifi.WifiManager;
import android.os.Environment;
import android.os.IBinder;
import android.os.PowerManager;

import java.io.File;
import java.io.IOException;

public class MusicService extends Service implements MediaPlayer.OnPreparedListener, AudioManager.OnAudioFocusChangeListener {

    public static final String ACTION_PLAY = "com.example.ACTION_PLAY";
    public static final String ACTION_PAUSE = "com.example.ACTION_PAUSE";
    public static final String ACTION_EXIT = "com.example.ACTION_EXIT";
    public static final String ACTION_STOP = "com.example.ACTION_STOP";
    private WifiManager.WifiLock lock;
    private MediaPlayer mediaPlayer;

    public MusicService() {
    }


    @Override
    public void onCreate() {
        super.onCreate();

        //获取音频的焦点
        AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        am.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);


    }

    private void initMediaPlayer() {
        mediaPlayer = new MediaPlayer();
        //保持CPU正常工作
        mediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
        //保持Wifi不被休眠
        WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        lock = wifiManager.createWifiLock("mylock");
        lock.acquire();
        mediaPlayer.setOnPreparedListener(this);
        notification();
    }

    private void notification() {
        Notification.Builder builder = new Notification.Builder(this);
        builder.setTicker("我的第一个音乐播放神器");
        builder.setSmallIcon(R.mipmap.yinyue);
        builder.setContentTitle("我的音乐神器");
        builder.setContentInfo("正在播放...");
        PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity3.class), PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(pi);
        NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = builder.build();

        startForeground(0, notification);
        nm.notify(0, notification);

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        lock.release();
        stopForeground(true);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String action = intent.getAction();
        if (ACTION_PLAY.equals(action)) {
            mediaPlayer.reset();
            try {
                mediaPlayer.setDataSource(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC) + File.separator + "zzlfz.mp3");
                mediaPlayer.prepareAsync();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else if (ACTION_PAUSE.equals(action)) {
            if (mediaPlayer.isPlaying()) {
                mediaPlayer.pause();
            }
        } else if (ACTION_EXIT.equals(action)) {
            if (mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
            mediaPlayer.release();
        }
        else if (ACTION_STOP.equals(action))
        {
            if (mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
            }
        }
        return super.onStartCommand(intent, flags, startId);

    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }


    @Override
    public void onPrepared(MediaPlayer mp) {
        mp.start();
    }

    @Override
    public void onAudioFocusChange(int focusChange) {
           switch (focusChange)
           {
               case AudioManager.AUDIOFOCUS_GAIN:
                   //已获取焦点
                   initMediaPlayer();
                   mediaPlayer.setVolume(1.0f,1.0f);
                   break;
               case AudioManager.AUDIOFOCUS_LOSS:
                   //长期失去焦点
                   if (mediaPlayer!=null)
                   {
                       if (mediaPlayer.isPlaying())
                       {
                           mediaPlayer.stop();
                       }
                       mediaPlayer.release();
                   }
                   break;
               case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                   //失去焦点，但很快会获取
                   if (mediaPlayer!=null)
                   {
                       if (mediaPlayer.isPlaying())
                       {
                           mediaPlayer.stop();
                       }
                   }
               case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                   //失去焦点，允许你吧声音调低，低音量继续播放
                   if (mediaPlayer.isPlaying())
                   {
                       mediaPlayer.setVolume(0.1f,0.1f);
                   }
                   break;
           }
    }
}
MusicIntentReceiver.java
package com.example.administrator.mediaplayer;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MusicIntentReceiver extends BroadcastReceiver {
   private static final String action="android.media.AUDIO_BECOMING_NOISY";
    public MusicIntentReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(action))
        {
            Intent intent1=new Intent(MusicService.ACTION_STOP);
            context.startService(intent1);
        }
    }
}
案例：
activity_main4.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.administrator.mediaplayer.MainActivity4">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查询音乐列表"
        android:onClick="queryMusic"
        android:id="@+id/button7"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentEnd="true" />
</RelativeLayout>
MainAvtivity4.java
package com.example.administrator.mediaplayer;

import android.content.ContentResolver;
import android.database.Cursor;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity4 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);
    }
    public void queryMusic(View view)
    {
        //用ContentResolver查询媒体
        ContentResolver cr=getContentResolver();

        Cursor c=cr.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,null);
        if (c!=null)
        {
            while(c.moveToNext())
            {
               String url= c.getString(c.getColumnIndex(MediaStore.Audio.Media.DATA));
               String songName= c.getString(c.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
               String artist= c.getString(c.getColumnIndex(MediaStore.Audio.Media.ARTIST));
               String time= c.getString(c.getColumnIndex(MediaStore.Audio.Media.DURATION));

                System.out.println("路径:"+url);
                System.out.println("歌名："+songName);
                System.out.println("歌手："+artist);
                System.out.println("时间："+time);
                System.out.println("--------------------------");
            }

        }
    }
}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

转载于:https://my.oschina.net/xiaofeiandroid/blog/657086

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