Android 手機(jī)電池電量的應(yīng)用

1、android 手機(jī)電池電量的應(yīng)用原理概述：手機(jī)電池電量的獵取在應(yīng)用程序的開(kāi)發(fā)中也很常用，系統(tǒng)中手機(jī)電池電量發(fā)生變幻的消息是通過(guò)intent廣播來(lái)實(shí)現(xiàn)的，常用的intent的action有 intent.action_battery_changed（電池電量發(fā)生轉(zhuǎn)變時(shí)）、intent.action_battery_low（電池電量達(dá)到下限時(shí)）、和intent.action_battery_okay（電池電量從低復(fù)原到高時(shí)）。當(dāng)需要在程序中獵取電池電量的信息時(shí)，需要為應(yīng)用程序注冊(cè)broadcastreceiver組件，當(dāng)特定的action大事發(fā)生時(shí)，系統(tǒng)將會(huì)發(fā)出相應(yīng)的廣播，應(yīng)用程序就可以通過(guò)br

2、oadcastreceiver來(lái)接受廣播，并舉行相應(yīng)的處理。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="停止獵取電量信息"

3、android:textoff="獵取電量信息" />android:layout_width="fill_parent"android:layout_height="wrap_content" />復(fù)制代碼batteryactivity類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) /獵取電池電量if(ischecked)intentfilter filter=new intentfilter(intent.action_battery_changed);registerreceiver(receiver, filter);/注冊(cè)broadcastreceiverelse /停止獵取電池電量unreg

7、isterreceiver(receiver);tv.settext(null););private class batteryreceiver extends broadcastreceiveroverridepublic void onreceive(context context, intent intent) int current=intent.getextras().getint("level");/獲得當(dāng)前電量int total=intent.getextras().getint("scale");/獲得總電量int percent=current*100/total;tv.settext("現(xiàn)在的電量是"+percent+"%。&quo