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为避免内存泄漏，正确写法应该是写个内部静态类+弱引用：
private static class MyHandler extends Handler {
private WeakReference<LoginActivity> activityWeakReference;
public MyHandler(LoginActivity activity) {
activityWeakReference = new WeakReference<>(activity);
}
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
LoginActivity activity = activityWeakReference.get();
if (activity != null) {
}
}
}