我试图在android中编写音乐播放器代码。我在服务中编写了MediaPlayer代码。这是代码:
package com.example.audioservice;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.util.Log;
public class MyService extends Service {
static MediaPlayer mp;
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
System.out.println("in MyService onCreate()");
mp=MediaPlayer.create(getApplicationContext(),R.raw.subanallah);
}
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
System.out.println("in onService onBind()");
return null;
}
@Override
public int onStartCommand(Intent intent,int flags, int startId) {
super.onStart(intent, startId);
Log.d("log", "In onStart.");
System.out.println("in MyService onStartCommand()");
mp.start();
return Service.START_STICKY;
}
}
并从Activity
调用该服务Intent s=new Intent(this,MyService.class);
startService(s);
在清单文件中添加了服务
<service android:name="com.example.audioservice.MyService"></service>
但是当按下主页/后退键时,应用程序又重新启动。我的要求是当按下主页/后退按钮时应用程序应该继续播放音乐。请帮助我。
答案 0 :(得分:2)
编辑完整代码
分步执行::
crate activity_main.xml并粘贴此
<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=".MainActivity" >
<Button
android:id="@+id/playId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/stopId"
android:layout_marginRight="53dp"
android:text="Play" />
<Button
android:id="@+id/stopId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="48dp"
android:layout_marginTop="50dp"
android:text="Stop" />
之后创建MyService类并粘贴此
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
public class MyService extends Service {
MediaPlayer mp;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public void onCreate()
{
super.onCreate();
mp = MediaPlayer.create(getApplicationContext(), R.raw.ram3);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
mp.start();
mp.setLooping(true);
return 0;
}
@Override
public void onDestroy()
{
mp.release();
super.onDestroy();
}
}
之后创建MainActivity1类并粘贴此
import android.os.Bundle;
import android.app.Activity; import android.content.Intent; import android.view.View; import android.widget.Button;
public class MainActivity1 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button play, stop;
play = (Button) findViewById(R.id.playId);
stop = (Button) findViewById(R.id.stopId);
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent service = new Intent(MainActivity1.this, MyService.class);
startService(service);
}
});
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent name = new Intent(MainActivity1.this, MyService.class);
stopService(name);
}
});
}
}
最后一步是粘贴以下代码AndroidManifest.XML
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity1"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service
android:name=".MyService"
android:enabled="true" >
</service>
</application>
这一定是必须的,毫无疑问。
答案 1 :(得分:0)
希望我能帮助你。
1.使用 startForeground()(我没有尝试过这种方式)
2.将此代码放在startService()下: bindService(Intent,ServiceConnection,BIND_IMPORTAN)。当然,你需要实现。(我使用它,在我的情况下有效)。