Service实时向Activity传递数据案例

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转自

http://www.cnblogs.com/linjiqin/p/3147764.html

演示一个案例，需求如下：
在Service组件中创建一个线程，该线程用来生产数值，每隔1秒数值自动加1，然后把更新后的数值在界面上实时显示。

步骤如下：
1、新建一个android项目工程，取名为demo。
2、新建一个Service类，用来实时生产数值，供界面实时显示。

package com.ljq.activity;

 

import android.app.Service;

import android.content.Intent;

import android.os.IBinder;

import android.util.Log;

 

public class CountService extends Service {

 private int count = 0;

 private boolean threadDisable=false;

 

 @Override

 public void onCreate() {

  super.onCreate();

   

  new Thread(new Runnable() {

   @Override

   public void run() {

    while (!threadDisable) {

     try {

      Thread.sleep(1000);

     } catch (InterruptedException e) {

      e.printStackTrace();

     }

     count++;

     Log.v("CountService", "Count is " + count);

      

     //发送广播

     Intent intent=new Intent();

     intent.putExtra("count", count);

     intent.setAction("com.ljq.activity.CountService");

     sendBroadcast(intent);

    }

   }

  }).start();

 

 }

 

 @Override

 public IBinder onBind(Intent intent) {

  return null;

 }

 

 @Override

 public void onDestroy() {

  super.onDestroy();

  count=0;

  threadDisable = true;

  Log.v("CountService", "on destroy");

 }

 

 

}

3、新建一个Activity类，显示数据。

package com.ljq.activity;

 

import android.app.Activity;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

 

public class MainActivity extends Activity {

 private EditText editText=null;

 private MyReceiver receiver=null;

  

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

         

        editText=(EditText)findViewById(R.id.editText);

         

        //启动服务

        startService(new Intent(MainActivity.this, CountService.class));

         

  //注册广播接收器

  receiver=new MyReceiver();

  IntentFilter filter=new IntentFilter();

  filter.addAction("com.ljq.activity.CountService");

  MainActivity.this.registerReceiver(receiver,filter);

    }

     

    @Override

 protected void onDestroy() {

     //结束服务

        stopService(new Intent(MainActivity.this, CountService.class));

  super.onDestroy(); 

 }

     

    /**

     * 获取广播数据

     *

     * @author jiqinlin

     *

     */

    public class MyReceiver extends BroadcastReceiver {

     @Override

     public void onReceive(Context context, Intent intent) {

      Bundle bundle=intent.getExtras();

      int count=bundle.getInt("count");

      editText.setText(count+"");   

     }

    }

 

      

     

 

}

4、main.xml布局文件

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 android:orientation="vertical"

 android:layout_width="fill_parent"

 android:layout_height="fill_parent">

    <EditText android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:cursorVisible="false"

        android:editable="false"

        android:id="@+id/editText"/>

 

</LinearLayout>

5、清单文件

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

      package="com.ljq.activity"

      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 =".CountService" />

 

    </application>

    <uses-sdk android:minSdkVersion="7" />

 

</manifest>