android.view.View#getZ ( )源码实例Demo

@Override
public int compare(View lhs, View rhs) {
    final float lz;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        lz = lhs.getZ();
    }else {
        lz = 0;
    }
    final float rz;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        rz = rhs.getZ();
    }else {
        rz = 0;
    }
    if (lz > rz) {
        return -1;
    } else if (lz < rz) {
        return 1;
    }
    return 0;
}
 

/**
 * 找到parent中处于指定坐标下最顶部的child(Z值最大，最后面添加)
 *
 * @param parent
 * @param x
 * @param y
 * @return
 */
public static View findTopChildUnder(ViewGroup parent, int x, int y)
{
    if (Build.VERSION.SDK_INT < 21)
        return parent.getChildAt(parent.getChildCount() - 1);

    final List<View> list = findChildrenUnder(parent, x, y);
    if (list.isEmpty())
        return null;

    View target = list.remove(0);
    for (View item : list)
    {
        if (item.getZ() > target.getZ())
            target = item;
    }

    return target;
}
 

public void updateView(View v) {
    if (v != null) {
        this.alpha = v.getAlpha();
        this.x = v.getX();
        this.y = v.getY();
        this.z = atLeastLollipop ? v.getZ() : 0;
        this.width = v.getWidth();
        this.height = v.getHeight();
        this.expansionScaleX = v.getScaleX();
        this.expansionScaleY = v.getScaleY();
        this.dispositionAngle = v.getRotation();
        this.dispositionAngleX = v.getRotationX();
        this.dispositionAngleY = v.getRotationY();
    }
}
 

@Override
public float getValue(View view) {
  if (isZSupported()) {
    return view.getZ();
  } else {
    return 0;
  }
}
 

public static float getZ(View view) {
    return view.getZ();
}