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。