- @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()不管何时调用，肯定大于2000
- {
- Toast.makeText(getApplicationContext(), "再按一次退出程序",Toast.LENGTH_SHORT).show();
- exitTime = System.currentTimeMillis();
- }
- else
- {
- finish();
- System.exit(0);
- }
- return true;
- }
- return super.onKeyDown(keyCode, event);
- }