前言

遇到一个手机电量管理软件开发案例，主界面需要显示当前手机的实时电量。但是我在翻了一些文档之后没有查到监听电量的方法。和广大网友一样退而求其次，选择监听电量状态。

一、导入此类

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;import com.yw.clean.utlis.LogUtils;public class BatteryListener {private Context mContext;private BatteryBroadcastReceiver receiver;private BatteryStateListener mBatteryStateListener;public BatteryListener(Context context) {mContext = context;receiver = new BatteryBroadcastReceiver();}public void register(BatteryStateListener listener) {mBatteryStateListener = listener;if (receiver != null) {IntentFilter filter = new IntentFilter();filter.addAction(Intent.ACTION_BATTERY_CHANGED);filter.addAction(Intent.ACTION_BATTERY_LOW);filter.addAction(Intent.ACTION_BATTERY_OKAY);filter.addAction(Intent.ACTION_POWER_CONNECTED);filter.addAction(Intent.ACTION_POWER_DISCONNECTED);mContext.registerReceiver(receiver, filter);}}public void unregister() {if (receiver != null) {mContext.unregisterReceiver(receiver);}}private class BatteryBroadcastReceiver extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {if (intent != null) {String acyion = intent.getAction();switch (acyion) {case Intent.ACTION_BATTERY_CHANGED://电量发生改变if (mBatteryStateListener != null) {LogUtils.e( "BatteryBroadcastReceiver --> onReceive--> ACTION_BATTERY_CHANGED");mBatteryStateListener.onStateChanged();}break;case Intent.ACTION_BATTERY_LOW://电量低if (mBatteryStateListener != null) {LogUtils.e( "BatteryBroadcastReceiver --> onReceive--> ACTION_BATTERY_LOW");mBatteryStateListener.onStateLow();}break;case Intent.ACTION_BATTERY_OKAY://电量充满if (mBatteryStateListener != null) {LogUtils.e("BatteryBroadcastReceiver --> onReceive--> ACTION_BATTERY_OKAY");mBatteryStateListener.onStateOkay();}break;case Intent.ACTION_POWER_CONNECTED://接通电源if (mBatteryStateListener != null) {LogUtils.e("BatteryBroadcastReceiver --> onReceive--> ACTION_POWER_CONNECTED");mBatteryStateListener.onStatePowerConnected();}break;case Intent.ACTION_POWER_DISCONNECTED://拔出电源if (mBatteryStateListener != null) {LogUtils.e("BatteryBroadcastReceiver --> onReceive--> ACTION_POWER_DISCONNECTED");mBatteryStateListener.onStatePowerDisconnected();}break;}}}}public interface BatteryStateListener {public void onStateChanged();public void onStateLow();public void onStateOkay();public void onStatePowerConnected();public void onStatePowerDisconnected();}}

如果你没有那个LogUtis，删掉相关引用就好，不影响什么。

二、使用步骤

代码如下（示例）：

public class MyActivity extends AppCompatActivity {BatteryListener batteryListener;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);}@Overrideprotected void onStart() {super.onStart();batteryListener = new BatteryListener(this);batteryListener.register(new BatteryListener.BatteryStateListener() {@Overridepublic void onStateChanged() {}@Overridepublic void onStateLow() {}@Overridepublic void onStateOkay() {}@Overridepublic void onStatePowerConnected() {}@Overridepublic void onStatePowerDisconnected() {}});}@Overrideprotected void onDestroy() {super.onDestroy();batteryListener.unregister();}
}

三、获取电量百分比

1、导入此类

public class BatteryUtils {/*** 主动获取当前电池是否在充电 , 即数据线是否插在手机上* @return*/public static boolean isBatteryCharging(Context context){boolean isBatteryCharging = false;// 主动发送包含是否正在充电状态的广播 , 该广播会持续发送IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);// 注册广播接受者Intent intent = context.registerReceiver(null, intentFilter);// 获取充电状态int batteryChargeState = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1);// 判定是否是 AC 交流电充电boolean isAc = batteryChargeState == BatteryManager.BATTERY_PLUGGED_AC;// 判断是否是 USB 充电boolean isUsb = batteryChargeState == BatteryManager.BATTERY_PLUGGED_USB;// 判断是否是 无线充电boolean isWireless = batteryChargeState == BatteryManager.BATTERY_PLUGGED_WIRELESS;// 如何上述任意一种为 true , 说明当前正在充电isBatteryCharging = isAc || isUsb || isWireless;return isBatteryCharging;}/*** 获取当前电量百分比* @param context 上下文* @return 电量百分比*/public static float getBatteryPct(Context context){// 主动发送包含是否正在充电状态的广播 , 该广播会持续发送IntentFilter intentFilter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);// 注册广播接受者Intent batteryStatus = context.registerReceiver(null, intentFilter);int level = batteryStatus.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);int scale = batteryStatus.getIntExtra(BatteryManager.EXTRA_SCALE, -1);return level * 100 / (float)scale;}}

2、使用

int batteryPct = (int) BatteryUtils.getBatteryPct(this);

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文章目录

前言

一、导入此类

二、使用步骤

三、获取电量百分比

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