导读：代码如下 private long exitTime; @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent KEYCODE_BACK event getAction() == KeyEvent ...
代码如下
private long exitTime;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK
&& event.getAction() == KeyEvent.ACTION_DOWN) {
if ((System.currentTimeMillis() - exitTime) > 2000) // System.currentTimeMillis()无论何时调用，肯定大于2000
{
Toast toast = Toast.makeText(getApplicationContext(),
getResources().getString(R.string.press_again_exit),
Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
exitTime = System.currentTimeMillis();
} else {
finish();
System.exit(0);
}
return true;
}
return super.onKeyDown(keyCode, event);
}
