偶然看到微信这个面对面发红包，看到上面的文字是反向的，这感觉还挺好，对方也能看的明白
最简单实现：在TextView中添加
android:rotation="180"
即可
Paste_Image.png
源码：
View.java
case com.android.internal.R.styleable.View_rotation:
rotation = a.getFloat(attr, 0);
transformSet = true;
/**
* Sets the degrees that the view is rotated around the pivot point. Increasing values
* result in clockwise rotation.
*
* @param rotation The degrees of rotation.
*
* @see #getRotation()
* @see #getPivotX()
* @see #getPivotY()
* @see #setRotationX(float)
* @see #setRotationY(float)
*
* @attr ref android.R.styleable#View_rotation
*/
public void setRotation(float rotation) {
if (rotation != getRotation()) {
// Double-invalidation is necessary to capture view's old and new areas
invalidateViewProperty(true, false);
mRenderNode.setRotation(rotation);
invalidateViewProperty(false, true);
invalidateParentIfNeededAndWasQuickRejected();
notifySubtreeAccessibilityStateChangedIfNeeded();
}
}
RenderNode.java
private static native boolean nSetRotation(long renderNode, float rotation);
用心设计
