Android 四大组件之 Service

1 生命周期图

2 第一种 非绑定方式 startService

2.1 自定义 Service

package com.demoservice;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
public class FirstService extends Service {
    MediaPlayer mplayer;
    Binder binder=new Binder();
    @Override
    public IBinder onBind(Intent intent) {
        // TODO 自动生成的方法存根
        return binder;
    }
    @Override
    public void onCreate() {
        // TODO 自动生成的方法存根
        super.onCreate();
        mplayer=MediaPlayer.create(this, R.raw.music12);
        Log.i("demo", "onCreate");
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO 自动生成的方法存根
        Log.i("demo", "onStartCommand");
        mplayer.start();
        return super.onStartCommand(intent, flags, startId);
    }
    @Override
    public void onDestroy() {
        // TODO 自动生成的方法存根
        Log.i("demo", "onDestroy");
        mplayer.stop();
        super.onDestroy();
    }
}

2.2 注册 Service

<service
    android:name="com.demoservice.FirstService">
    <intent-filter >
        <action android:name="michael.FIRSTSERVICE"/>
    </intent-filter>
</service>

2.3 开启/关闭 Service

package com.demoservice;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
    Button btn_start,btn_stop;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_start=(Button)findViewById(R.id.btn_start);
        btn_stop=(Button)findViewById(R.id.btn_stop);
        
        final Intent intent=new Intent();
        intent.setAction("michael.FIRSTSERVICE");
        
        OnClickListener listener=new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                if(v == btn_start)
                {
                    startService(intent);
                }else if(v==btn_stop)
                {
                    stopService(intent);
                }
            }
        };    
        btn_start.setOnClickListener(listener);
        btn_stop.setOnClickListener(listener);
    }
}

3 第二种 绑定方式 bindService

3.1 自定义 Service

package com.SecondService;
import com.demoservice.R;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
public class SecondService extends Service {
    int count;
    boolean quit=false;
    MediaPlayer mplayer;
    MyBinder binder=new MyBinder();
    @Override
    public IBinder onBind(Intent intent) {
        // TODO 自动生成的方法存根
        Log.i("demo", "onBind");
        mplayer.start();
        
        new Thread()
        {
            @Override
            public void run() {
                while(!quit)
                {
                    try {Thread.sleep(1000);} catch (InterruptedException e) {e.printStackTrace();}
                    count++;
                    Log.i("demo", String.valueOf(count));
                }
            }
        }.start();
        return binder;
    }
    @Override
    public boolean onUnbind(Intent intent) {
        Log.i("demo", "onUnbind");
        quit=true;
        return super.onUnbind(intent);
    }
    @Override
    public void onRebind(Intent intent) {
        Log.i("demo", "onRebind");
        mplayer.start();
        super.onRebind(intent);
    }
    @Override
    public void onCreate() {
        super.onCreate();
        quit=false;
        mplayer=MediaPlayer.create(this, R.raw.music12);
        Log.i("demo", "onCreate");
    }
    @Override
    public void onDestroy() {
        Log.i("demo", "onDestroy");
        mplayer.stop();
        quit=true;
        super.onDestroy();
    }
    
    class MyBinder extends Binder
    {
        public SecondService getService()
        {
            return SecondService.this;
        }
        public int getCount()
        {
            return count;
        }
    }
}

3.2 注册 Service

<service
    android:name="com.SecondService.SecondService">
    <intent-filter >
        <action android:name="michael.SECONDSERVICE"/>
    </intent-filter>
</service>

3.3 绑定/解绑Service

package com.SecondService;
import com.demoservice.R;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
    SecondService mservice;
    ServiceConnection conn=new ServiceConnection() {
        
        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO 自动生成的方法存根
            Log.i("demo", "onServiceDisconnected");
            mservice=null;
        }
        
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO 自动生成的方法存根
            Log.i("demo", "onServiceConnecteds");
            mservice = ((SecondService.MyBinder)service).getService();
        }
    };
    
    Button btn_start,btn_stop,btn_get;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_start=(Button)findViewById(R.id.btn_start);
        btn_get=(Button)findViewById(R.id.btn_get);
        btn_stop=(Button)findViewById(R.id.btn_stop);
        final Intent intent=new Intent();
        intent.setAction("michael.SECONDSERVICE");
        
        OnClickListener listener=new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                // TODO 自动生成的方法存根
                if(v == btn_start)
                {
                    bindService(intent, conn, BIND_AUTO_CREATE);
                }else if(v==btn_stop)
                {
                    unbindService(conn);
                }else if(v==btn_get)
                {
                    btn_get.setText(String.valueOf(mservice.binder.getCount()));
                }
            }
        };    
        btn_start.setOnClickListener(listener);
        btn_stop.setOnClickListener(listener);
        btn_get.setOnClickListener(listener);
    }
}

注：转载请注明出处 :) 毕竟代码是一个一个敲出来的啊，O(∩_∩)O~