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can someone give me a good explanation regarding Z order. Firstly, I don't understand what it is and(something like the definition)and secondly how an element of a Z order looks like. I hope I am explicit enough.
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In Android starting from API level 21, items in the layout file get their Z order both from how they are ordered within the file, as described in correct answer, and from their elevation, a higher elevation value means the item gets a higher Z order.
Z-Index for Annotation Stacking Order on AndroidA z-index of 0 means that the annotation is all the way at the back, while the highest z-index means that the annotation is at the front.
FrameLayout is designed to block out an area on the screen to display a single item. Generally, FrameLayout should be used to hold a single child view, because it can be difficult to organize child views in a way that's scalable to different screen sizes without the children overlapping each other.
What is Android View? A View is a simple building block of a user interface. It is a small rectangular box that can be TextView, EditText, or even a button. It occupies the area on the screen in a rectangular area and is responsible for drawing and event handling.
Z order determines how objects lay on each other - that is which one is on top. This is good example for HTML (with example pictures). In android is simpler (that is in my opinion conception is simpler, but usage could be less easy) since there is no explicit z index. If you use xml layout z order is determined by order of declaration views declaration in xml but if you prefer you can also change order from java code.
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Starting on Android API level 21 the Z order is also affected by the android:elevation for a more detailed explanation see my answer here https://stackoverflow.com/a/38536318/2168700
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