Android建立能与Activity进行相互通信的本地服务

最新推荐文章于 2023-04-09 17:20:14 发布

jaycee110905

最新推荐文章于 2023-04-09 17:20:14 发布

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本文介绍了一个简单的Android应用程序案例，展示了如何使用Service组件进行前后台的数据交互和服务绑定。具体包括定义服务接口、实现服务端和客户端的绑定逻辑以及通过Intent进行服务绑定等关键步骤。

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MyService.java

package cn.itcast.service;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;

public class MyService extends Service {
	private Binder binder = new MyBinder();
	
	public String getName(int id){
		return "传智播客";
	}
	
	@Override
	public IBinder onBind(Intent intent) {
		return binder;
	}
	
	private final class MyBinder extends Binder implements IService{
		public String getName(int id){
			return MyService.this.getName(23);
		}
	}

}

MainActivity.java

package cn.itcast.service;

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.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
    private MyServiceConnection conn;
    private IService myservice;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        conn = new MyServiceConnection();
        Intent intent = new Intent(this, MyService.class);
        bindService(intent, conn, BIND_AUTO_CREATE);
        Button button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {			
			@Override
			public void onClick(View v) {
				TextView resultView = (TextView) findViewById(R.id.result);
				resultView.setText(myservice.getName(56));
			}
		});
    }
    
    private final class MyServiceConnection implements ServiceConnection{
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			myservice = (IService)service;
		}

		@Override
		public void onServiceDisconnected(ComponentName name) {
			myservice = null;
		}
    }

	@Override
	protected void onDestroy() {
		unbindService(conn);
		super.onDestroy();
	}
    
}

IService.java

package cn.itcast.service;

public interface IService {
	public String getName(int id);
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.itcast.service"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".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>
		<service android:name=".MyService"/>
    </application>
    <uses-sdk android:minSdkVersion="8" />

</manifest>