22 电量变化广播

• 权限

 <!--检测电量的权限  -->
    <uses-permission android:name="android.permission.BATTERY_STATS"/>

意图

public static final String ACTION_BATTERY_CHANGED = “android.intent.action.BATTERY_CHANGED”;

结构:

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.qf.day22_broadcastreceiver_demo6"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <!--检测电量的权限  -->
    <uses-permission android:name="android.permission.BATTERY_STATS"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.qf.day22_broadcastreceiver_demo6.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>
    </application>

</manifest>

MainActivity.java

package com.qf.day22_broadcastreceiver_demo6;

import android.app.Activity;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;

public class MainActivity extends Activity {

    private MyBatteryReceiver myBatteryReceiver = new MyBatteryReceiver();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //检测电源变化的 action
        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(myBatteryReceiver, intentFilter);
    }



}

MyBatteryReceiver.java

package com.qf.day22_broadcastreceiver_demo6;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

public class MyBatteryReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub

        if(Intent.ACTION_BATTERY_CHANGED.equals(intent.getAction())){

            //获取电量等级
            int level = intent.getIntExtra("level", 0);

            //获取总的电量
            int total = intent.getIntExtra("scale", 0);

            //当前展示的电量
            int current = (level*100)/total;

            Log.e("AAA", "=level="+level+"=total=总电量:"+total+"=current=当前电量:"+current+"%");

        }

    }

}