Android 双击退出应用程序
Android About 1,141 words双击退出程序
方式一:
private boolean isExit;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
isExit = false;
}
};
@Override
public void onBackPressed() {
if (mFm.getBackStackEntryCount() != 0) {//添加fragment时会用到
super.onBackPressed();
return;
}
if (!isExit) {
isExit = true;
Toast.makeText(MainActivity.this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
mHandler.sendEmptyMessageDelayed(0, 2000);
} else {
finish();
}
}
方式二:
private long currentBackPressedTime = 0;
// 退出间隔
private static final int BACK_PRESSED_INTERVAL = 2000;
//重写onBackPressed()方法,继承自退出的方法
@Override
public void onBackPressed() {
// 判断时间间隔
if (System.currentTimeMillis() - currentBackPressedTime > BACK_PRESSED_INTERVAL) {
currentBackPressedTime = System.currentTimeMillis();
Toast.makeText(this, "再按一次返回键退出程序", Toast.LENGTH_SHORT).show();
} else {
// 退出
super.onBackPressed();
}
}
退出到桌面
不是真实退出程序。
调用activity
的moveTaskToBack(boolean nonRoot);
方法。
moveTaskToBack(true);
Views: 3,964 · Posted: 2019-04-09
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