android - is my do loop code for java correct? -

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is correct? im modifying source code github : usb charge commander when battery goes down 20 percent charge when batter goes 80 wont , countdown timer every 5 mins set 20000 testing

    boolean startcountdown=true;     do{          new countdowntimer(20000, 1000) {          intent intent  = _context.registerreceiver(null, new intentfilter(intent.action_battery_changed));            int    level   = intent.getintextra(batterymanager.extra_level, 0);         int    scale   = intent.getintextra(batterymanager.extra_scale, 100);         int    percent = (level*100)/scale;          public void ontick(long millisuntilfinished) {}          public void onfinish() {                 if(percent <= 20){                         _iischarging = 1;                 }                 else if (percent >=80){                         _iischarging = 0;                 }                 else{                         _iischarging = 1;                 }             }         }.start();         }while(startcountdown);

there no way do/while loop end, it's infinite loop @ moment. boolean "startcountdown" needs way go value of false. example 

if (_iischarging == 0) {     startcountdown = false; }

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