因为多数启动服务不必同时处理多个请求(在多线程情景下会很危险),所以使用IntentService类实现服务是很好的选择。本经验将通过继承IntentService输出当前时间教大家如何使用IntentService。
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.basillee.asus.demo.MainActivity5">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="当前时间"
android:id="@+id/button_current_time"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
然后我们在编写一个CurrentTimeService类,继承IntentService
package com.basillee.asus.demo;
import android.app.IntentService;
import android.content.Intent;
import android.text.format.Time;
import android.util.Log;
public class CurrentTimeService extends IntentService {
public CurrentTimeService(){
super("CurrentTimeService");
}
@Override
protected void onHandleIntent(Intent intent) {
Time time=new Time();
time.setToNow();
String currentTime=time.format("%Y-%m-%d %H:%M:%S");
Log.i("CurrentTimeService",currentTime);
}
}
然后我们在Oncreate方法里面编写如下代码为button增加监听事件
package com.basillee.asus.demo;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity5 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity5);
Button button= (Button) findViewById(R.id.button_current_time);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startService(new Intent(MainActivity5.this, CurrentTimeService.class));
}
});
}
}
更多细节请看: http://jingyan.baidu.com/season/48891