参见英文答案 > How to prevent custom views from losing state across screen orientation changes                                    7个
我知道活动状态保存和恢复.
但我想要做的是保存和恢复视图的状态.
我有一个自定义视图和两个重写方法：

@Override
protected void onRestoreInstanceState(Parcelable state) {
    if (state instanceof Bundle) {
        Bundle bundle = (Bundle) state;
        currentLeftX = bundle.getInt(CURRENT_LEFT_X_PARAM, 0);
        currentTopY = bundle.getInt(CURRENT_TOP_Y_PARAM, 0);
    }
    super.onRestoreInstanceState(state);
}

@Override
protected Parcelable onSaveInstanceState() {
    super.onSaveInstanceState();
    Bundle bundle = new Bundle();
    bundle.putInt(CURRENT_LEFT_X_PARAM, currentLeftX);
    bundle.putInt(CURRENT_TOP_Y_PARAM, currentTopY);
    return bundle;
}

我希望这可以无缝工作,但遇到并且错误：

Caused by:
java.lang.IllegalArgumentException:
Wrong state class, expecting View
State but received class
android.os.Bundle instead. This
usually happens when two views of
different type have the same id in the
same hierarchy. This view’s id is
id/mapViewId. Make sure other views do
not use the same id.
at android.view.View.onRestoreInstanceState(View.java:6161)

但这种观点是我活动中唯一的观点.所以,我问：

保存视图状态的正确方法是什么？

解决方法:

你删除super.OnSaveInstanceState()的结果并返回你自己的结果.
然后在OnRestoreInstanceState(Parcelable)中返回您创建的那个.

解决方案是：

How to prevent custom views from losing state across screen orientation changes #2