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。
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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" );
}
}
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3、新建一个Activity类,显示数据。
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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+ "" );
}
}
}
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4、main.xml布局文件
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<? 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 >
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5、清单文件
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<? 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 >
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效果如下:
希望本文所述对大家的Android程序设计有所帮助。