Android编程实现添加低电流提醒功能的方法
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2023-12-18 12:53:58
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.a...
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; } }
更多关于android相关内容感兴趣的读者可查看本站专题:《android硬件相关操作与应用总结》、《android文件操作技巧汇总》、《android开发入门与进阶教程》、《android资源操作技巧汇总》、《android视图view技巧总结》及《android控件用法总结》
希望本文所述对大家android程序设计有所帮助。
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