android - 在Android中旋转90度后调整 View 的宽度和高度

Question

我想以编程方式添加 View 并将其旋转 90 度，但我不知道如何正确设置其尺寸。

这是我的占位符:

        <FrameLayout
            android:layout_width="40dp"
            android:layout_height="match_parent"
            android:id="@+id/placeholder"
            android:orientation="vertical"
            android:background="@color/green"
            android:layout_weight="1">

我的代码是这样的:

    FrameLayout placeholderView = (FrameLayout) findViewById(R.id.placeholder);

    View myView = new View(getApplicationContext());
    myView.setBackgroundColor(Color.RED);
    myView.setRotation(90);
    FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
    myView.setLayoutParams(layoutParams);
    placeholderView.addView(myView);

结果是宽度和高度都得到相同的值，所以 View 看起来像这样:

虽然我希望它在其父级的整个高度上扩展。

Answer 1

ViewGroup.LayoutParams.FILL_PARENT你好，你能试试这个吗 而不是这个:

myView.setRotation(90);
FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)

试试这个:

删除设置旋转

FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT);