Several methods to center layout in Android

In Android layout files, if you want a component (layout or View) to be centered within another layout (component), there are several methods to achieve this:

1. android:layout_gravity
2. android:gravity
3. android:layout_centerInParent
   

layout_gravity

android:layout_gravity, used to specify the position of the current component (layout or View) within its parent component (layout). The parent layout should be a LinearLayout or its descendant.

The possible values of layout_gravity are:

1. top
2. bottom
3. left
4. right
5. center_vertical
6. fill_vertical
7. center_horizontal
8. fill_horizontal
9. center
10. fill
11. clip_vertical
12. clip_horizontal
13. start
14. end
    

The values related to centering have been bolded. The specific meanings of various values, see:

https://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html .

gravity

android:gravity is a property of View, used to specify the position of the child components of View. It is applicable to all Views and layouts. It has many values, for specific information, see: https://developer.android.com/reference/android/view/Gravity.html .

Values related to centering:

1. center
2. center_horizontal
3. center_vertical
   

When you set a layout android:gravity="center", its child components will be centered. When you set a View android:gravity="center", its content will be centered, taking TextView as an example, the text will be centered.

layout_centerInParent

android:layout_centerInParent is a layout attribute of RelativeLayout. If the parent layout of a component (layout or View) is RelativeLayout, this attribute can be used to center. Its value is true or false.

Similar ones include:

1. android:layout_centerHorizontal
2. android:layout_centerVertical
   

For specific meaning and usage, see: https://developer.android.com/reference/android/widget/RelativeLayout.LayoutParams.html .

This is the summary of several methods for centering the layout of Android, and more related information will be supplemented later, thank you for your support to this site!

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