扣丁学堂笔记第22天多媒体播放
1.简单介绍与播放三种媒体源
MainActivity
package com.example.mediaplayertest;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void playResClick(View view) {
// MediaPlayer mp = MediaPlayer.create(this, R.raw.a1);
// mp.start();
}
public void playSysClick(View view) {
MediaPlayer mp = new MediaPlayer();
String path = Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC)
+ "/a2.mp3";
try {
mp.setDataSource(this, Uri.parse(path));
mp.prepare();// 同步运行
mp.start();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void playNetClick(View view) {
// 音乐链接要保证有效
String path = "http://y.qq.com/index.html#type=song&mid=0040E7kG0ZJ9al&tpl=yqq_song_detail";
MediaPlayer mp = new MediaPlayer();
try {
mp.setDataSource(this, Uri.parse(path));
mp.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.start();
}
});
mp.prepareAsync();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
activtiy_main
<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.mediaplayertest.MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="播放本地文件"
android:onClick="playResClick" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/button1"
android:layout_below="@+id/button1"
android:text="播放系统文件"
android:onClick="playSysClick"/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_alignRight="@+id/button2"
android:layout_below="@+id/button2"
android:text="播放网络文件"
android:onClick="playNetClick" />
</RelativeLayout>
AndroidManifest
<uses-permission android:name="android.permission.INTERNET"/>
2.MediaPlayer状态分析
3.简单的播放器实现案例
MainActivity
package com.example.simpleplayertest;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener,
OnPreparedListener, OnErrorListener, OnCompletionListener {
private MediaPlayer player;
private int index = 0;//表示当前要播放的音乐的索引
private ArrayList<String> musicList = new ArrayList<String>();
private Button btn_play, btn_pause, btn_last, btn_next;
private boolean isPause = false;//true表示暂停状态
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initMusic();
player = new MediaPlayer();
player.setOnPreparedListener(this);
player.setOnErrorListener(this);
player.setOnCompletionListener(this);
}
private void initView() {
// TODO Auto-generated method stub
btn_play = (Button) findViewById(R.id.btn_play);
btn_pause = (Button) findViewById(R.id.btn_pause);
btn_last = (Button) findViewById(R.id.btn_last);
btn_next = (Button) findViewById(R.id.btn_next);
btn_play.setOnClickListener(this);
btn_pause.setOnClickListener(this);
btn_last.setOnClickListener(this);
btn_next.setOnClickListener(this);
}
private void initMusic() {
String root = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_MUSIC).getPath();
musicList.add(root + File.separator + "a.mp3");
musicList.add(root + File.separator + "b.mp3");
musicList.add(root + File.separator + "c.mp3");
musicList.add(root + File.separator + "d.mp3");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
if(player!=null){
if(player.isPlaying()){
player.stop();
}
player.release();
}
}
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
next();
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
player.reset();
return true;
}
@Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.start();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn_play:
play();
break;
case R.id.btn_pause:
pause();
break;
case R.id.btn_last:
last();
break;
case R.id.btn_next:
next();
break;
default:
break;
}
}
private void next() {
// TODO Auto-generated method stub
if(index+1<musicList.size()-1){
index++;
}else{
index = 0;
}
start();
}
private void last() {
// TODO Auto-generated method stub
if(index-1>=0){
index--;
}else{
index = musicList.size()-1;
}
start();
}
//暂停
private void pause() {
// TODO Auto-generated method stub
if(player.isPlaying()){
player.pause();
isPause = true;
}
}
private void play() {
// TODO Auto-generated method stub
if(isPause){
player.start();//接着播放（不是从头開始）
isPause = false;
}else{
start();//音乐从头開始播放的方法
}
}
//音乐从头開始播放的方法
private void start() {
// TODO Auto-generated method stub
if(index<musicList.size()){
if(player.isPlaying()){
player.stop();
}
player.reset();
String musicPath = musicList.get(index);
try {
player.setDataSource(musicPath);
player.prepareAsync();//之后调用onPrepared方法
isPause = false;
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
activity_main
<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.simpleplayertest.MainActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="@drawable/ic_launcher" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageView1"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_last"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上一首"
android:layout_weight="1" />
<Button
android:id="@+id/btn_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/button1"
android:layout_toRightOf="@+id/button1"
android:text="播放"
android:layout_weight="1"/>
<Button
android:id="@+id/btn_pause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button2"
android:layout_alignBottom="@+id/button2"
android:layout_toRightOf="@+id/button2"
android:text="暂停"
android:layout_weight="1"/>
<Button
android:id="@+id/btn_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button3"
android:layout_alignBottom="@+id/button3"
android:layout_alignParentRight="true"
android:text="下一首"
android:layout_weight="1"/>
</LinearLayout>
</RelativeLayout>
4.在服务中使用MediaPlayer
5.作为前台服务执行
在服务中使用mediaplayer+作为前台服务执行代码
MyService.java
package com.example.servicemediaplayertest;
import java.io.File;
import java.io.IOException;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.app.Notification.Builder;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.net.wifi.WifiManager;
import android.os.Environment;
import android.os.IBinder;
import android.os.PowerManager;
public class MyService extends Service implements OnPreparedListener{
public static final String ACTION_PLAY = "com.example.servicemediaplayertest.ACTION_PLAY";
public static final String ACTION_PAUSE = "com.example.servicemediaplayertest.ACTION_PAUSE";
public static final String ACTION_EXIT = "com.example.servicemediaplayertest.ACTION_EXIT";
private MediaPlayer player;
private WifiManager.WifiLock lock;
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
player = new MediaPlayer();
//保持cpu正常工作
player.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();
player.setOnPreparedListener(this);
notification();
}
private void notification() {
// TODO Auto-generated method stub
Notification.Builder builder = new Builder(this);
builder.setTicker("为她音悦");
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentTitle("我的音乐播放器");
builder.setContentInfo("正在播放");
PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this,MainActivity.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 int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
String action = intent.getAction();
if(ACTION_PLAY.equals(action)){
player.reset();
try {
player.setDataSource(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC)+File.separator+"a.mp3");
player.prepareAsync();
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else if(ACTION_PAUSE.equals(action)){
if(player.isPlaying())player.pause();
}else if(ACTION_EXIT.equals(action)){
if(player.isPlaying())player.stop();
player.release();
}
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
stopForeground(true);
lock.release();
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
mp.start();
}
}
MainActivity
package com.example.servicemediaplayertest;
import android.app.Activity;
import android.app.Notification;
import android.app.Notification.Builder;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// @Override
// public boolean onKeyDown(int keyCode, KeyEvent event) {
// // TODO Auto-generated method stub
// if(keyCode==KeyEvent.KEYCODE_BACK){
//
// }
// return super.onKeyDown(keyCode, event);
// }
public void playClick(View view) {
Intent intent = new Intent(MyService.ACTION_PLAY);
startService(intent);
}
public void pauseClick(View view) {
Intent intent = new Intent(MyService.ACTION_PAUSE);
startService(intent);
}
public void exitClick(View view) {
Intent intent = new Intent(MyService.ACTION_EXIT);
startService(intent);
}
}
activity_main
<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.servicemediaplayertest.MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="PLAY"
android:onClick="playClick"/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:text="PAUSE"
android:onClick="pauseClick"/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:text="EXIT"
android:onClick="exitClick"/>
</RelativeLayout>
Androidmanifest
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<service android:name=".MyService"
android:process=":music">
<intent-filter>
<action android:name="com.example.servicemediaplayertest.ACTION_PLAY"/>
<action android:name="com.example.servicemediaplayertest.ACTION_PAUSE"/>
<action android:name="com.example.servicemediaplayertest.ACTION_EXIT"/>
</intent-filter>
</service>6.处理音频焦点
7.ContentResolver获取媒体信息
8.ContentResolver測试
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