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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。
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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;
}
}
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