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。