最近下了几个apk,貌似连续点击两次返回按钮退出程序已经成为主流了。于是就在网上看了下别人写的,然后我就无语了,这么个功能竟然一长串代码。于是我就自己写了个,效果是一样的:
private long firstTime;
private long secondTime;
private long spaceTime;
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
firstTime = System.currentTimeMillis();
spaceTime = firstTime - secondTime;
secondTime = firstTime;
Log.i("Lynn", "spaceTime" + spaceTime);
if (spaceTime > 2000) {
Toast.makeText(MainActivity.this, "再按一次退出程序",
Toast.LENGTH_SHORT).show();
return false;
} else {
MainActivity.this.finish();
}
}
return super.onKeyDown(keyCode, event);
}