只需进行自定义ViewGroup
(或扩展现有的)并在画布绘制子对象之前缩放画布:
public class MirrorRelativeLayout extends RelativeLayout {
public MirrorRelativeLayout(Context context) {
super(context);
}
public MirrorRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MirrorRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void dispatchDraw(Canvas canvas) {
canvas.save();
// Scale the canvas in reverse in the x-direction, pivoting on
// the center of the view
canvas.scale(-1f, 1f, getWidth() / 2f, getHeight() / 2f);
super.dispatchDraw(canvas);
canvas.restore();
}
@Override
public void draw(Canvas canvas) {
canvas.save();
// Scale the canvas in reverse in the x-direction, pivoting on
// the center of the view
canvas.scale(-1f, 1f, getWidth() / 2f, getHeight() / 2f);
super.dispatchDraw(canvas);
canvas.restore();
}
}
然后将其ViewGroup
用作布局的根:
<com.your.packagename.MirrorRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:text="Mirror Text!"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</com.your.packagename.MirrorRelativeLayout>