上层接收电量变化广播，添加未充电判断，做出弹框或关机动作
SystemUI\src\com\android\systemui\power\PowerUI.java

@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (PowerManager.ACTION_POWER_SAVE_MODE_CHANGED.equals(action)) {ThreadUtils.postOnBackgroundThread(() -> {if (mPowerManager.isPowerSaveMode()) {mWarnings.dismissLowBatteryWarning();}});} else if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {//电量变化广播mHasReceivedBattery = true;final int oldBatteryLevel = mBatteryLevel;mBatteryLevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 100);final int oldBatteryStatus = mBatteryStatus;mBatteryStatus = intent.getIntExtra(BatteryManager.EXTRA_STATUS,BatteryManager.BATTERY_STATUS_UNKNOWN);					final int oldPlugType = mPlugType;mPlugType = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 1);final int oldInvalidCharger = mInvalidCharger;mInvalidCharger = intent.getIntExtra(BatteryManager.EXTRA_INVALID_CHARGER, 0);mLastBatteryStateSnapshot = mCurrentBatteryStateSnapshot;final boolean plugged = mPlugType != 0;final boolean oldPlugged = oldPlugType != 0;int oldBucket = findBatteryLevelBucket(oldBatteryLevel);int bucket = findBatteryLevelBucket(mBatteryLevel);/*** Unisoc: 5G resident reminder Feature decoupling(3/3)* AR: AR.599.001744.006995.022501* method: hook interface* Unisoc Code @{*/if(powerUIEx != null)powerUIEx.remind5GReside(mBatteryLevel,mHandler);/* @} */if (DEBUG) {Slog.d(TAG, "buckets   ....." + mLowBatteryAlertCloseLevel+ " .. " + mLowBatteryReminderLevels[0]+ " .. " + mLowBatteryReminderLevels[1]);Slog.d(TAG, "level          " + oldBatteryLevel + " --> " + mBatteryLevel);Slog.d(TAG, "status         " + oldBatteryStatus + " --> " + mBatteryStatus);Slog.d(TAG, "plugType       " + oldPlugType + " --> " + mPlugType);Slog.d(TAG, "invalidCharger " + oldInvalidCharger + " --> " + mInvalidCharger);Slog.d(TAG, "bucket         " + oldBucket + " --> " + bucket);Slog.d(TAG, "plugged        " + oldPlugged + " --> " + plugged);}if(mBatteryLevel==15 && !plugged){ //判断未充电，电量15时弹框提示//Toast.makeText(mContext, "Battery low. The device will power off when the battery drops to 10%.", Toast.LENGTH_LONG).show();	//也可以通过toast提示mWarnings.showMyLowBatteryWarning();	 		}if(mBatteryLevel<11 && !plugged){ //未充电，电量低于10关机try{Intent shutdownBatteryLevel = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);shutdownBatteryLevel.putExtra(Intent.EXTRA_KEY_CONFIRM,false);shutdownBatteryLevel.putExtra("shutdown_mode","battery");shutdownBatteryLevel.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);mContext.startActivityAsUser(shutdownBatteryLevel,UserHandle.CURRENT);}catch(Exception e){Slog.d(TAG, "batteryLevel e="+e.toString());}}mWarnings.update(mBatteryLevel, bucket, mScreenOffTime);........public interface WarningsUI {/*** Updates battery and screen info for determining whether to trigger battery warnings or* not.* @param batteryLevel The current battery level* @param bucket The current battery bucket* @param screenOffTime How long the screen has been off in millis*/void update(int batteryLevel, int bucket, long screenOffTime);void dismissLowBatteryWarning();void showMyLowBatteryWarning();// add 这个方法在PowerNotificationWarnings.java实现

SystemUI\src\com\android\systemui\power\PowerNotificationWarnings.java

    @Overridepublic void showInvalidChargerWarning() {mInvalidCharger = true;updateNotification();}// addpublic void showJzhkLowBatteryWarning() {final SystemUIDialog d = new SystemUIDialog(mContext);//d.setIconAttribute(android.R.attr.alertDialogIcon);d.setTitle("Warning");d.setCancelable(false);d.setMessage("Battery low. The device will power off when the battery drops to 10%.");d.setPositiveButton(com.android.internal.R.string.ok, null);d.setShowForAllUsers(true);d.show();}// add end