android service基本知识(demo版)

完成service服务需要如下几步:

<1> : 重写Serivce子类,即写一个继承Service类(extends Service);

public class MyService extends Service{
...
}

 

<2> : 在AndroidMainfest.xml文件中添加service,基本上和Activity差不多:

<service 
            android:name=".MyService">
            <intent-filter>
                <action android:name="com.example.androidservicedemo0.MY_SERVICE"/>
            </intent-filter>
        </service>

<3> : 如果是不介意activity结束后,service仍然继续运行,只需要使用:

....

final Intent intent=new Intent();
        intent.setAction("com.example.androidservicedemo0.BIND_SERVICE");

....
startService(intent);

停止服务:

stopService(intent);

 

如果希望activity结束后,service也随之结束,需要绑定服务.

activity或者service之间要通信,传递参数,可以使用Binder接口,自己实现这个接口.

实现上面demo如下:

主类:

package com.example.androidservicedemo0;

import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import .Activity;
import .Service;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    private Button mStartButton,mStopButton;
    private Button mBindButton,mUnBindButton;
    private Button mSerivceStatusButton;

    BindService.MBinder binder;

    private final String TAG="MainActivity";

    private ServiceConnection conn=new ServiceConnection(){

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            // TODO Auto-generated method stub
            Log.i(TAG,"service connection .");
            binder=(BindService.MBinder)service;
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub
            Log.i(TAG,"service disconnection .");
        }

    };

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

        final Intent intent=new Intent();
        intent.setAction("com.example.androidservicedemo0.BIND_SERVICE");

        mStartButton=(Button)findViewById(.button1);
        mStartButton.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startService(intent);
            }

        });

        mStopButton=(Button)findViewById(.button2);
        mStopButton.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                stopService(intent);
            }

        });

        mBindButton=(Button)findViewById(.button3);
        mBindButton.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                bindService(intent,conn,Service.BIND_AUTO_CREATE);
            }

        });
        mUnBindButton=(Button)findViewById(.button4);
        mUnBindButton.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                unbindService(conn);
            }

        });
        mSerivceStatusButton=(Button)findViewById(.button5);
        mSerivceStatusButton.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "counter : "+binder.getCounter(), Toast.LENGTH_SHORT).show();
            }

        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

服务类:

package com.example.androidservicedemo0;

import .Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

public class BindService extends Service{

    private final String TAG="BindService";

    private MBinder mBinder=new MBinder();
    private int mCounter;
    private boolean quit;

    public class MBinder extends Binder{
        public int getCounter(){

            return mCounter;

        }
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // TODO Auto-generated method stub
        Log.i(TAG,"unbind service .");
        return super.onUnbind(intent);
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        Log.i(TAG,"bind service .");
        return mBinder;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        Log.i(TAG,"service create .");
        new Thread(){
            public void run(){
                while(!quit){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    mCounter++;
                }

            }
        }.start();

    }

    @Override
    public void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        Log.i(TAG,"stop service .");
        this.quit=true;
    }

    @Override
    @Deprecated
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub
        super.onStart(intent, startId);
        Log.i(TAG,"service start .");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        Log.i(TAG,"service start command .");
        mCounter=0;
        return super.onStartCommand(intent, flags, startId);
    }


}

AndroidMainfest.xml文件配置如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http:///apk/res/android"
    package="com.example.androidservicedemo0"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <service 
            android:name=".BindService">
            <intent-filter>
                <action android:name="com.example.androidservicedemo0.BIND_SERVICE"/>
            </intent-filter>
        </service>

        <activity
            android:name="com.example.androidservicedemo0.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>

</manifest>

布局文件:

<RelativeLayout xmlns:android="http:///apk/res/android"
    xmlns:tools="http:///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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginLeft="39dp"
        android:layout_marginTop="22dp"
        android:text="start service" />

    <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="stop service" />

    <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="bind service" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button3"
        android:layout_below="@+id/button3"
        android:layout_marginTop="96dp"
        android:text="unbind service" />

    <Button
        android:id="@+id/button5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button3"
        android:layout_alignRight="@+id/button1"
        android:layout_centerVertical="true"
        android:text="service status" />

</RelativeLayout>