67 Android service 和 activity 的数据通信_androidserveice和actity-优快云博客

本文介绍了一个Android应用程序中Service组件的使用方式，包括Service的创建、绑定及与Activity之间的数据通信过程。通过示例代码详细展示了如何实现Activity与Service间的交互，如数据传递和回调等。

activity_main.xml (布局文件)

<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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25sp" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button2"
        android:layout_centerHorizontal="true"
        android:text="卸载srvice服务" />

    <Button
        android:id="@+id/button4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button2"
        android:layout_below="@+id/button3"
        android:text="service数据通信" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button3"
        android:layout_centerVertical="true"
        android:text="调用service方法" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/button2"
        android:layout_alignLeft="@+id/button2"
        android:text="绑定service" />

</RelativeLayout>

DownloadService extends Service

DownloadService.java

package com.example.android_service_activity;

import java.util.Random;

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

public class DownloadService extends Service {

	private final String TAG = "DownloadService";
	
    private Binder localBinder=new LocalBinder();
    //随机数
    private final Random random=new Random();
	public DownloadService() {

	}

	public class LocalBinder extends Binder {
		public DownloadService getService() {
			return DownloadService.this;
		}
		
		@Override
		protected boolean onTransact(int code, Parcel data, Parcel reply,
				int flags) throws RemoteException {
			// TODO Auto-generated method stub
			System.out.println("---->>从activice获取的值；"+data.readInt());
			System.out.println("---->>>从activice获取的值："+data.readString());
			
			reply.writeInt(getRandom());
			reply.writeString(" rose+ jack");
			return super.onTransact(code, data, reply, flags);
		}
	}
	/**
	 * 自定义获取随机数:提供给客户端调用，通常是Activity
	 * 
	 * @return 随机数
	 */
	public int getRandom()
	{
		return random.nextInt(100);
	}
	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		Log.i(TAG, "----->>>>>>>onCreate");
	}

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

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

	@Override
	public void onRebind(Intent intent) {
		// TODO Auto-generated method stu
		super.onRebind(intent);
		Log.i(TAG, "----->>>>>>>onRebind");
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		Log.i(TAG, "----->>>>>>>onDestroy");
	}

}

MainActivity.java

package com.example.android_service_activity;

import com.example.android_service_activity.DownloadService.LocalBinder;

import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

	Button button1, button2, button3, button4;
	TextView textView;
	private boolean flag;
	private DownloadService downloadService;

	
	private LocalBinder localBinder;//全局的变量
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		button1 = (Button) findViewById(R.id.button1);
		button2 = (Button) findViewById(R.id.button2);
		button3 = (Button) findViewById(R.id.button3);
		button4 = (Button) findViewById(R.id.button4);
		textView = (TextView) findViewById(R.id.textView1);

		button1.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				// 绑定service
//				bindService(downloadService, conn, flags)

			}
		});

		button2.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				if(flag){
				int value = downloadService.getRandom();
				textView.setText("" + value);
				}
			}
		});
		button3.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				//解绑
				unbindService(connection);
				flag=false;
				
			}
		});
		button4.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				//向service 传递数据
				Parcel parcel=Parcel.obtain();
				parcel.writeInt(23);
				parcel.writeString("Jack");
				
				//从service 获取数据
				Parcel reply=Parcel.obtain();
				try {
					localBinder.transact(Binder.LAST_CALL_TRANSACTION, parcel, reply, 0);
				} catch (RemoteException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
				System.out.println("------>>从service中回传的值"+reply.readInt());
				System.out.println("------>>从service中回传的值"+reply.readString());
			}
		});

	}

	@Override
	protected void onStart() {
		// TODO Auto-generated method stub
		super.onStart();
		// 绑定Service
		Intent intent = new Intent(MainActivity.this, DownloadService.class);
		bindService(intent, connection, Context.BIND_AUTO_CREATE);
	}

	// @Override
	// protected void onStop() {
	// // TODO Auto-generated method stub
	// super.onStop();
	// }

	public ServiceConnection connection = new ServiceConnection() {

		@Override
		public void onServiceDisconnected(ComponentName name) {
			// TODO Auto-generated method stub
			flag = false;
		}

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			// TODO Auto-generated method stub
			 localBinder = (LocalBinder) service;
			downloadService = localBinder.getService();
			flag = true;
		}
	};

	@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;
	}

}