在智能手机的开发过程中，经常需要获取手机的电池信息。其实获取的方法很多，下面介绍下方法。
一：首先介绍获取电池容量。例如java反射方式获取。代码如下
package com.example.jamesfan.getbatterycapacity;import android.content.Context;public class BatteryInfo {public String getCapaCity(Context context) {Object mPowerProfile;double mBatteryCapacity = 0;String POWER_PROFILE_CLASS = "com.android.internal.os.PowerProfile";try {mPowerProfile = Class.forName(POWER_PROFILE_CLASS).getConstructor(Context.class).newInstance(context);mBatteryCapacity = (double) Class.forName(POWER_PROFILE_CLASS).getMethod("getBatteryCapacity").invoke(mPowerProfile);} catch (Exception e) {e.printStackTrace();}return String.valueOf(mBatteryCapacity + " mAh");}
如果是做项目，可以在如下默认文件中修改。一般第三方软件都是通过读取这里获取电池容量的。
文件路径:frameworks\base\core\res\res\xml\power_profile.xml
默认情况下是 1000 mAh，一般手机厂商会进行修改，便于第三方应用读取
<!-- This is the battery capacity in mAh (measured at nominal voltage) --><item name="battery.capacity">1000</item>
二：其次是通过广播方式接受电池信息。如下代码
package com.example.jamesfan.getbatterycapacity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.os.BatteryManager;import android.util.Log;import android.widget.Toast;public class BatteryReceiver extends BroadcastReceiver {int mCurrentLevel = 0;int m_total = 0;String m_strPercent;@Overridepublic void onReceive(Context context, Intent intent) {final String action = intent.getAction();if(action.equalsIgnoreCase(Intent.ACTION_BATTERY_CHANGED)){Log.i("james-fan","get battery change broad");}// mCurrentLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);//m_total = intent.getIntExtra(BatteryManager.EXTRA_STATUS, -1);mCurrentLevel = intent.getExtras().getInt("level");// 获得当前电量m_total = intent.getExtras().getInt("scale");// 获得总电量int percent = mCurrentLevel * 100 / m_total;m_strPercent =percent+ "%";}public int getCurrentLevel(){return mCurrentLevel;}public int getTotal(){return m_total;}public String getBatteryPercent(){return m_strPercent;}
三：接下来是主函数，广播采用的是动态注册方式。也可以采用静态注册方法。
package com.example.jamesfan.getbatterycapacity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {BatteryReceiver m_receiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);m_receiver = new BatteryReceiver();registerReceiver(m_receiver, intentFilter);Button showBatteryCapacity = (Button) findViewById(R.id.showBatteryCapacity);Button showBatteryInfo = (Button) findViewById(R.id.showBatteryInfo);//showBatteryCapacity.setOnClickListener(this);showBatteryCapacity.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {BatteryInfo batteryInfo = new BatteryInfo();String strBatteryInfo = batteryInfo.getCapaCity(MainActivity.this);Toast.makeText(MainActivity.this, strBatteryInfo, Toast.LENGTH_SHORT).show();}});showBatteryInfo.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {String str;str = "CurrentLevel =" + m_receiver.getCurrentLevel()+ " Total=" + m_receiver.getTotal()+ " percent=" + m_receiver.getBatteryPercent();Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();}});}@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(m_receiver);}}
