Android 手机电池电量的应用

1、android 手机电池电量的应用原理概述：手机电池电量的猎取在应用程序的开发中也很常用，系统中手机电池电量发生变幻的消息是通过intent广播来实现的，常用的intent的action有 intent.action_battery_changed（电池电量发生转变时）、intent.action_battery_low（电池电量达到下限时）、和intent.action_battery_okay（电池电量从低复原到高时）。当需要在程序中猎取电池电量的信息时，需要为应用程序注册broadcastreceiver组件，当特定的action大事发生时，系统将会发出相应的广播，应用程序就可以通过br

2、oadcastreceiver来接受广播，并举行相应的处理。main.xml布局文件android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent">android:layout_width="fill_parent"android:layout_height="wrap_content"android:texton="停止猎取电量信息"

3、android:textoff="猎取电量信息" />android:layout_width="fill_parent"android:layout_height="wrap_content" />复制代码batteryactivity类package com.ljq.activity;import android.app.activity;import android.content.broadcastreceiver;import android.content.context;import android.cont

4、ent.intent;import android.content.intentfilter;import android.os.bundle;import android.widget.compoundbutton;import android.widget.textview;import android.widget.togglebutton;import android.widget.compoundbutton.oncheckedchangelistener;public class batteryactivity extends activity private togglebutt

5、on tb=null;private textview tv=null;private batteryreceiver receiver=null;overridepublic void oncreate(bundle savedinstancestate) super.oncreate(savedinstancestate);setcontentview(r.layout.main);receiver=new batteryreceiver();tv=(textview)findviewbyid(r.id.tv);tb=(togglebutton)findviewbyid(r.id.tb);

6、tb.setoncheckedchangelistener(new oncheckedchangelistener()public void oncheckedchanged(compoundbutton compoundbutton, boolean ischecked) /猎取电池电量if(ischecked)intentfilter filter=new intentfilter(intent.action_battery_changed);registerreceiver(receiver, filter);/注册broadcastreceiverelse /停止猎取电池电量unreg

7、isterreceiver(receiver);tv.settext(null););private class batteryreceiver extends broadcastreceiveroverridepublic void onreceive(context context, intent intent) int current=intent.getextras().getint("level");/获得当前电量int total=intent.getextras().getint("scale");/获得总电量int percent=current*100/total;tv.settext("现在的电量是"+percent+"%。&quo