4.1.3.2 电池充电的监听 Broadcast-Receiver

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电池充电的广播接收，只能通过动态注册，不能通过静态注册：

public class MainActivity extends AppCompatActivity {

private BatteryReceiver batteryReceiver;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

batteryReceiver = new BatteryReceiver();

}

@Override

protected void onResume() {

super.onResume();

//1.创建IntentFilter,对应<intent-filter><action/>

//直接指定

IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);

//2.动态注册Context对象registerReceiver

//!!!哪个Context注册，那么，这个Receiver作用范围

registerReceiver(batteryReceiver, intentFilter);

}

@Override

protected void onPause() {

super.onPause();

//onPause 里面一定要取消注册：不然在退出的时候会报错：

unregisterReceiver(batteryReceiver);

}

@Override

protected void onDestroy() {

super.onDestroy();

batteryReceiver=null;

}

}

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package com.kodulf.broadcastrecevierdemo.receivers;

/**

* Created by Administrator on 15-12-15.

*/

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.os.BatteryManager;

import android.util.Log;

/**

* 动态注册的案例，

* 使用电池电量检测；

* ！！！注意，电池电量只能够使用动态注册，如果使用静态的就会把系统弄的太慢了。

*/

public class BatteryRecevier extends BroadcastReceiver {

private String TAG="BatteryRecevier";

@Override

public void onReceive(Context context, Intent intent) {

//1，定义action 内容，也就是电池变化的ACTION

String action = intent.getAction();

//电池电量变化，是Android 基本的状态，所以定义在Intent 中

//包含一个ACTION

if(action.equals(Intent.ACTION_BATTERY_CHANGED)){

//2.获取电量相关信息

//标准的广播信息，都存储在Intent 参数中，

//通过BatteryManager来获取；内部包含了常量定义

int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL,0);

int scale = intent.getIntExtra(BatteryManager.EXTRA_SCALE,0);

int health = intent.getIntExtra(BatteryManager.EXTRA_HEALTH,0);

int state = intent.getIntExtra(BatteryManager.EXTRA_STATUS,0);

int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED,0);

Log.d("TAG","level "+level);

Log.d("TAG","scale "+scale);

Log.d("TAG","health "+health);

Log.d("TAG","state "+state);

Log.d("TAG","plugged "+plugged);

//检测是否街上电源了

switch(plugged){

case BatteryManager.BATTERY_PLUGGED_AC:

//接上电源插座，交流电

break;

case BatteryManager.BATTERY_PLUGGED_USB:

//接上电脑USB充电

break;

case BatteryManager.BATTERY_PLUGGED_WIRELESS:

//无线充电

break;

}

//----------------------------------

//检测status

switch(state){

case BatteryManager.BATTERY_STATUS_CHARGING:

//充电中

break;

case BatteryManager.BATTERY_STATUS_DISCHARGING:

//耗电

break;

case BatteryManager.BATTERY_STATUS_FULL:

//充满电

break;

}

}

}

}