测试系统:DEEPIN LINUX 15.6
测试软件:ANDROID STUDIO 3.1.3
测试机器:i6200扫描枪
Activity(JAVA)使用:
// 用来计算返回键的点击间隔时间
private long exitTime = 0;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (
keyCode == KeyEvent.KEYCODE_BACK
&& event.getAction() == KeyEvent.ACTION_DOWN
) {
if ((System.currentTimeMillis() - exitTime) > 2000) {
//弹出提示,可以有多种方式
Toast.makeText(getApplicationContext(), "再按一次退出程序", Toast.LENGTH_SHORT).show();
exitTime = System.currentTimeMillis();
} else {
finish();
}
return true;
}
return super.onKeyDown(keyCode, event);
}