无意中看见的。。。。https://blog.csdn.net/u010350891/article/details/83415761
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if((getIntent().getFlags() & Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT) != 0)
{
finish();
return;
}
setContentView(R.layout.activity_loading);
}
.
//点击返回键返回桌面而不是退出程序
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
Intent home = new Intent(Intent.ACTION_MAIN);
home.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
home.addCategory(Intent.CATEGORY_HOME);
startActivity(home);
return true;
}
return super.onKeyDown(keyCode, event);
}