问题描述
我正在为 android 编写一个聊天程序.
I am programming a chat program for android.
我将联系人列表作为一项活动，将聊天窗口作为第二项活动.我使用 startActivity 切换到聊天活动，但聊天活动每次都会重新加载.因此屏幕被清除.
I have the contact list as one activity and the chat windows as a second activity. I use startActivity to switch to the chat activity, but the chat activity gets reloaded every time. Therefore the screen gets cleared.
有没有办法切换到正在运行的活动而无需重新启动它?
Is there a way to switch to a running activity without having to restart it?
private Intent myIntent = null;
…
if (myIntent == null)
myIntent = new Intent(HanasuAndroidActivity.activity, ChatWindow.class);
this.startActivity(myIntent);
推荐答案
将 FLAG_ACTIVITY_REORDER_TO_FRONT 添加到您的 Intent.这会将现有的活动实例(如果存在)带到前台，如果不存在则创建一个新实例.
Add FLAG_ACTIVITY_REORDER_TO_FRONT to your Intent. That will bring the existing activity instance to the foreground if it exists or create a new one if it does not exist.
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