Service实时向Activity传递数据案例

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：