android 显示电池电量

原文引入：http://blog.csdn.net/it_farmer2010/article/details/6334051

没事的时候，记得多学一点，每天进步一点点，好让自己跟上这个每天在变化的技术环境，话不多说，上代码。

直接上代码吧。

package com.jli.battery;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.BitmapFactory;
import android.os.BatteryManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;

public class Main extends Activity {
private ImageView tvBatteryChanged;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvBatteryChanged = (ImageView)findViewById(R.id.test);
//注册一个接受广播类型
registerReceiver(new BatteryBroadcastReceiver(), new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
}

/**接受电量改变广播*/
class BatteryBroadcastReceiver extends BroadcastReceiver{
int intLevel = 0;
int intScale = 0;
String BatteryV=null;//电压
String BatteryT=null;//温度
String BatteryStatus=null;//电池状态
String BatteryStatus2=null;//电池充电方式
String BatteryTemp=null; //电池键康状态

@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)){
intLevel = intent.getIntExtra("level", 0);
intScale = intent.getIntExtra("scale", 100);
int curPower = (intLevel * 100 / intScale)/25;// 计算当前电量
switch (curPower) {
case 0:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power0));
break;
case 1:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power1));
break;
case 2:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power2));
break;
case 3:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power3));
break;
case 4:
tvBatteryChanged.setImageBitmap(BitmapFactory.decodeResource(Main.this.getResources(), R.drawable.power4));
break;
}
String action = intent.getAction();
/*
* 如果捕捉到的action是ACTION_BATTERY_CHANGED， 就运行onBatteryInfoReceiver()
*/
if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
Log.d("Battery V", "" + intent.getIntExtra("voltage", 0));    // 电池伏数
Log.d("Battery T", "" + intent.getIntExtra("temperature", 0));     // 电池温度
BatteryV = "当前电压为：" + intent.getIntExtra("voltage", 0);
BatteryT = "当前温度为：" + (intent.getIntExtra("temperature", 0)*0.1);
switch (intent.getIntExtra("status",BatteryManager.BATTERY_STATUS_UNKNOWN)) {
case BatteryManager.BATTERY_STATUS_CHARGING:
BatteryStatus = "充电状态";
break;
case BatteryManager.BATTERY_STATUS_DISCHARGING:
BatteryStatus = "放电状态";
break;
case BatteryManager.BATTERY_STATUS_NOT_CHARGING:
BatteryStatus = "未充电";
break;
case BatteryManager.BATTERY_STATUS_FULL:
BatteryStatus = "充满电";
break;
case BatteryManager.BATTERY_STATUS_UNKNOWN:
BatteryStatus = "未知道状态";
break;
}
switch (intent.getIntExtra("plugged", BatteryManager.BATTERY_PLUGGED_AC)) {
case BatteryManager.BATTERY_PLUGGED_AC:
BatteryStatus2 = "AC充电";
break;
case BatteryManager.BATTERY_PLUGGED_USB:
BatteryStatus2 = "USB充电";
break;
}
switch (intent.getIntExtra("health", BatteryManager.BATTERY_HEALTH_UNKNOWN)) {
case BatteryManager.BATTERY_HEALTH_UNKNOWN:
BatteryTemp = "未知错误";
break;
case BatteryManager.BATTERY_HEALTH_GOOD:
BatteryTemp = "状态良好";
break;
case BatteryManager.BATTERY_HEALTH_DEAD:
BatteryTemp = "电池没有电";
break;
case BatteryManager.BATTERY_HEALTH_OVER_VOLTAGE:
BatteryTemp = "电池电压过高";
break;
case BatteryManager.BATTERY_HEALTH_OVERHEAT:
BatteryTemp =  "电池过热";
break;
}
}

ListView lv = (ListView)findViewById(R.id.batteryListView);
String [] batterys={BatteryV,BatteryT,"电池状态："+BatteryStatus,"电池充电方式："+BatteryStatus2,"电池键康状态："+BatteryTemp};
lv.setAdapter(new ArrayAdapter(Main.this, android.R.layout.simple_list_item_1,batterys));

}
}

}

}

然后要在AndroidManifest.xml 申请电池检测权限。

<uses-permission android:name="android.permission.BATTERY_STATS" />

最后看一下效果图吧。



注：最上边的那个ImageView 是展示的一张图片，跟据当前电量检测不同显示 的。