嗨,我最近做了一个简单的秒表应用程序,它工作正常。但是,当我切换屏幕并将其打开时,计时器会显示最后一次的时间值。例如,如果定时器显示给我00:00:10,则将(5秒钟)的屏幕重新打开并显示相同的值,并开始增加时间值。当屏幕关闭时,android stopwatch停止工作
任何建议为什么?
感谢
if (savedInstanceState != null) {
seconds = savedInstanceState.getInt("seconds");
running = savedInstanceState.getBoolean("running");
wasRunning = savedInstanceState.getBoolean("wasRunning");
}
runTimer();
}
public void onClickStart(View view){
running = true;
}
public void onClickStop(View view){
running = false;
}
public void onClickReset(View view){
running = false;
seconds = 0;
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putInt("seconds", seconds);
savedInstanceState.putBoolean("running", running);
savedInstanceState.putBoolean("wasRunning",wasRunning);
}
@Override
protected void onPause(){
super.onPause();
wasRunning = running;
running = false;
}
@Override
protected void onResume(){
super.onResume();
if(wasRunning){
running = true;
}
}
@Override
protected void onStop(){
super.onStop();
wasRunning = running;
running = false;
}
@Override
protected void onStart(){
super.onStart();
if(wasRunning){
running = true;
}
}
private void runTimer(){
final TextView timeView = (TextView)findViewById(R.id.time_view);
final Handler handler = new Handler();
handler.post(new Runnable() {
@Override
public void run() {
int hours = seconds/3600;
int minutes = (seconds%3600)/60;
int secs = seconds%60;
String time = String.format("%d:%02d:%02d",hours,minutes,secs);
timeView.setText(time);
if(running){
seconds++;
}
handler.postDelayed(this,1000);
}
});
}
好,那么纠正我,如果我错了,为了保持秒表运行,而屏幕是或应用程序在后台我需要删除这些方法? – MariusBrave
是的,你必须。但尝试使用'服务'.https://developer.android.com/guide/components/services.html –
谢谢生病检查出 – MariusBrave