android TextView onRestoreInstanceState取值错误

Question

我的代码是这样的：

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState savedState = new SavedState(superState);
        savedState.progress = mProgress;
        return savedState;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
            SavedState savedState = (SavedState) state;
            mProgress = savedState.progress;
            super.onRestoreInstanceState(savedState.getSuperState());
    }

当我在onSaveInstanceState中将mProgress值传递给savedState时，它的值是60，而在onRestoreInstanceState中，我得到的值是0。

如果我将onSavedInstanceState中的代码savedState.mProgress = mProgress修改为savedState.mProgress = 10，那么在onRestoreInstanceState中我会得到10。

太奇怪了。如果我把mProgress设为静态的，那么我会得到60。我不知道是怎么回事。

Answer 1

像这样使用，

@Override
protected void onCreate(Bundle savedInstanceState) {
    if (savedInstanceState != null) {
        mProgress = savedInstanceState.getInt("progress");            
    }
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("progress", mProgress);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    if (savedInstanceState != null) {
        mProgress = savedInstanceState.getInt("progress");            
    }
}