Android Android how to click the prompt and press the exit again or double-click to exit

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The prompt "Press once more to exit the application" is realized for the first time. If it is pressed again within 1.5 seconds, it will exit. If it exceeds 1.5 seconds, it will prompt again "Press once more to exit the application";

btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (count==0) {Toast.makeText(Main.this, "Press again to exit app," Toast.LENGTH_SHORT).show();count=1; t1 = System.currentTimeMillis();}else if (count==1) {t2 = System.currentTimeMillis();if (t2-t1