Android编程实现添加低电流提醒功能的方法

Intent.ACTION_BATTERY_CHANGEDplugType = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);if(mLowElectricityRemind == null){  mLowElectricityRemind = new LowElectricityRemind(BatteryMeterView.this.getContext());}mLowElectricityRemind.changePlugType(plugType);

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;  }}