安卓倒记时

packagecom.example.countdown;

importandroid.graphics.Color;

importandroid.os.Handler;

importandroid.support.v7.app.AppCompatActivity;

importandroid.os.Bundle;

importandroid.text.Spannable;

importandroid.text.SpannableString;

importandroid.text.SpannableStringBuilder;

importandroid.text.Spanned;

importandroid.text.style.ForegroundColorSpan;

importandroid.widget.TextView;

importjava.text.ParseException;

importjava.text.SimpleDateFormat;

importjava.util.Date;

public classMainActivityextendsAppCompatActivity {

privateTextViewtextView;

privateHandlerhandler;

SimpleDateFormatsimpleDateFormat=newSimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");

@Override

protected voidonCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

textView= (TextView) findViewById(R.id.tv_time);

handler=newHandler();

handler.postDelayed(runnable,1000);

}

privateRunnablerunnable=newRunnable() {

private longnewTimes;

private longtimes;

privateDatedate;

@Override

public voidrun() {

try{

date=simpleDateFormat.parse("2017年06月30日 17:00:00");

times= System.currentTimeMillis();

newTimes=date.getTime() -times;

newTimes=newTimes/1000;

textView.setText(setTimeStringColor(timeStringLength(newTimes/3600)+"时"+timeStringLength(newTimes/60%60)+"分"+timeStringLength(newTimes%60)+"秒"));

handler.postDelayed(runnable,1000);

}catch(ParseException e) {

e.printStackTrace();

}

}

};

privateString timeStringLength(longtime) {

String time_str = time+"";

if(time_str.length() <2){

time_str ="0"+ time_str;

}

returntime_str;

}

privateSpannableStringBuilder setTimeStringColor(String time) {

SpannableStringBuilder time_str =newSpannableStringBuilder(time);

ForegroundColorSpan one =newForegroundColorSpan(Color.RED);

ForegroundColorSpan two =newForegroundColorSpan(Color.BLACK);

ForegroundColorSpan three =newForegroundColorSpan(Color.RED);

ForegroundColorSpan four =newForegroundColorSpan(Color.BLACK);

ForegroundColorSpan five =newForegroundColorSpan(Color.RED);

ForegroundColorSpan six =newForegroundColorSpan(Color.BLACK);

time_str.setSpan(one,0,2,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

time_str.setSpan(two,2,3,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

time_str.setSpan(three,3,5,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

time_str.setSpan(four,5,6,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

time_str.setSpan(five,6,8,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

time_str.setSpan(six,8,9,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

returntime_str;

}

}