Android添加低电流提醒功能 Android编程实现添加低电流提醒功能的方法
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本文实例讲述了Android编程实现添加低电流提醒功能的方法。分享给大家供大家参考,具体如下:
特殊需求,检测电流是否正常。
监听如下广播:
Intent.ACTION_BATTERY_CHANGED plugType = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0); if(mLowElectricityRemind == null){ mLowElectricityRemind = new LowElectricityRemind(BatteryMeterView.this.getContext()); } mLowElectricityRemind.changePlugType(plugType);
添加LowElectricityRemind类
package com.android.systemui; import android.content.Context; import android.content.DialogInterface; import android.os.BatteryManager; import android.os.Handler; import android.util.Slog; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import com.android.systemui.statusbar.phone.SystemUIDialog; /** * add low electricity remind * Created by fanlj on 2017-2-18. */ public class LowElectricityRemind { private static final String TAG = LowElectricityRemind.class.getSimpleName(); private static final int LOW_ELECTRICITY_REMIND_DELAYED = 50000; private static final long REMIND_INTERVAL = 3 * 1000 * 60; //Three minutes private static final int MAX_CURRENT_COUNT = 3; private static final boolean DEBUG = true; private boolean isFirstInitialize = true; private Context mContext; private Handler mHandler; private int[] mCurrent = new int[MAX_CURRENT_COUNT]; private File mCurrentNowFile = null; private SystemUIDialog mRemidDialog; private long mLastPlugCurrent = 0; private long mLastRemindTime = 0; //if mRemidDialog is showed, mLastRemindTime != 0 private boolean isIgnore = false; LowElectricityRemind(Context context){ mContext = context; mHandler = new Handler(); mCurrentNowFile = new File("/sys/class/power_supply/battery/current_now"); } public void changePlugType(int type){ if(DEBUG) { Slog.e(TAG, "change plug type to " + type); } mHandler.removeCallbacks(lowElectricityRemindRunnable); if(type == BatteryManager.BATTERY_PLUGGED_AC || (DEBUG && type == BatteryManager.BATTERY_PLUGGED_USB)){ if(DEBUG) { Slog.e(TAG, "start runnable"); } if(isFirstInitialize){ isFirstInitialize = false; } mHandler.postDelayed(lowElectricityRemindRunnable, LOW_ELECTRICITY_REMIND_DELAYED); } else { cleanAllCache(); } } private Runnable lowElectricityRemindRunnable = new Runnable() { @Override public void run() { if(!needShowRemindDialog(true)){ postDelayed(); return; } boolean isFull = true; int cbattNow = readCurrent(); if(mLastPlugCurrent == cbattNow){ postDelayed(); return; } mLastPlugCurrent = cbattNow; if(mCurrent[MAX_CURRENT_COUNT - 1] != 0){ int minIndex = 0; int maxIndex = 0; for (int i = MAX_CURRENT_COUNT; i > 1; i--){ int curr = mCurrent[i]; if(mCurrent[minIndex] > curr){ minIndex = i; } if(mCurrent[maxIndex] < curr){ maxIndex = i; } } if(cbattNow < 0){ //In the charging int min = mCurrent[minIndex]; int max = mCurrent[maxIndex]; if((min < 0 && min < cbattNow) || (min > 0 && min > cbattNow)){ //-1600 < -1400 900 > 800 if true, replace min value. mCurrent[minIndex] = cbattNow; } else if((max < 0 && max < cbattNow) || (max > 0 && max > cbattNow)){ //-1600 < -1400 900 > 800 mCurrent[maxIndex] = cbattNow; } } } else { for (int i = 0; i < MAX_CURRENT_COUNT; i++){ if(mCurrent[i] == 0){ mCurrent[i] = cbattNow; if(i != MAX_CURRENT_COUNT - 1) { isFull = false; } else { isFull = true; } break; } } } //if(isFull && needShowRemindDialog(false)){ if(isFull && needShowRemindDialog(true)){ if(mRemidDialog == null){ mRemidDialog = new SystemUIDialog(mContext); mRemidDialog.setTitle(R.string.charge_current_warning_title); mRemidDialog.setPositiveButton(R.string.charge_current_warning_yes, null); mRemidDialog.setNegativeButton(R.string.charge_current_warning_ignore, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { isIgnore = true; } }); } if(DEBUG && mRemidDialog.isShowing()){ mRemidDialog.dismiss(); } if(!mRemidDialog.isShowing()){ String message = mContext.getString(R.string.charge_current_warning_content); if(DEBUG){ message += "\n"; for (int i = 0; i < MAX_CURRENT_COUNT; i++){ message += mCurrent[i]; message += " "; } } mRemidDialog.setMessage(message); mRemidDialog.show(); } //clean all save cleanAllCache(); mLastRemindTime = System.currentTimeMillis(); } postDelayed(); } }; private void postDelayed(){ mHandler.removeCallbacks(lowElectricityRemindRunnable); mHandler.postDelayed(lowElectricityRemindRunnable, LOW_ELECTRICITY_REMIND_DELAYED); } private void cleanAllCache(){ for (int i = 0; i < MAX_CURRENT_COUNT; i++){ mCurrent[i] = 0; } mLastPlugCurrent = 0; } /** * read battery current * @return battery current */ private int readCurrent(){ int cbattNow = 0; FileReader fileReader; BufferedReader br; try { fileReader = new FileReader(mCurrentNowFile); br = new BufferedReader(fileReader); cbattNow = Integer.parseInt(br.readLine()); cbattNow = cbattNow / 1000; //uA to mA br.close(); fileReader.close(); if(DEBUG) { Slog.e(TAG, "last plug current : " + cbattNow); } } catch (FileNotFoundException e) { Slog.e(TAG, "Failure in reading battery current", e); } catch (IOException e) { Slog.e(TAG, "Failure in reading battery current", e); } return cbattNow; } private boolean needShowRemindDialog(boolean filterData){ if(isIgnore){ return false; } boolean isNeedShow = true; if(!filterData){ for (int i = 0; i < MAX_CURRENT_COUNT; i++){ if(mCurrent[i] <= 0){ isNeedShow = false; break; } } } if(isNeedShow){ long currTime = System.currentTimeMillis(); if(DEBUG){ Slog.e(TAG, "mLastRemindTime = " + mLastRemindTime + " currTime = " + currTime); } if(mLastRemindTime == 0){ isNeedShow = true; } else if(mLastRemindTime + REMIND_INTERVAL <= currTime){ isNeedShow = true; } else{ isNeedShow = false; } } if(DEBUG){ Slog.e(TAG, "need show remind dialog = " + isNeedShow); } return isNeedShow; } }
希望本文所述对大家Android程序设计有所帮助。
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