Android中Service实时向Activity传递数据实例分析

本文实例讲述了android中service实时向activity传递数据的方法。分享给大家供大家参考。具体如下：

这里演示一个案例，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>

效果如下：

希望本文所述对大家的android程序设计有所帮助。