Android：调整视图大小而不丢失位置

我有这个布局

<RelativeLayout
        android:id="@+id/gameportView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <com.pepotegames.spotthedifferences.DifferenceView
            android:id="@+id/imageA"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_above="@+id/progressBar1"
            android:layout_centerHorizontal="true" />

        <ProgressBar
            android:id="@+id/progressBar1"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="match_parent"
            android:layout_height="16dp"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:max="1000"
            android:progress="0" />

        <com.pepotegames.spotthedifferences.DifferenceView
            android:id="@+id/imageB"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@+id/progressBar1"
            android:layout_centerHorizontal="true" />

    </RelativeLayout>

---

一切都很好，只是我把一套新的布局参数传递给了我的酒吧。那么，如何调整进度条的大小而不丢失android:layout\u centerHorizontal=“true”和android:layout\u centerVertical=“true”属性？

与其创建新的LayoutParams，不如尝试使用提取视图的当前LayoutParams，然后编辑所需的值。

使用以下方法-

imageA.setOnSizeChangedLister(new DifferenceView.OnSizeChangedListener(){
    @Override
    public void onResize(){
        level.scaleBy(imageA.getScale());

        RelativeLayout.LayoutParams existingLayoutParams = ((RelativeLayout.LayoutParams) bar.getLayoutParams());
        existingLayoutParams.width = imageA.getWidth();
        existingLayoutParams.height = imageA.getHeight();
        bar.setLayoutParams(existingLayoutParams);
    }
});

imageA.setOnSizeChangedLister(new DifferenceView.OnSizeChangedListener(){
    @Override
    public void onResize(){
        level.scaleBy(imageA.getScale());

        RelativeLayout.LayoutParams existingLayoutParams = ((RelativeLayout.LayoutParams) bar.getLayoutParams());
        existingLayoutParams.width = imageA.getWidth();
        existingLayoutParams.height = imageA.getHeight();
        bar.setLayoutParams(existingLayoutParams);
    }
});