The margin setting is invalid when the root layout of Android dynamically loads the sub layout.

Most Android controls have two attributes: padding and layout_margin. The difference is generally:

Padding:Control contentThe distance from the control edge.

Margin: ControlAway from its parent ControlThe distance from the edge.

Today, an experiment was conducted to dynamically load sub-la s from the root layout. The results show that the two attributes in the sub-layout can be displayed as expected, however, the padding set for the root layout does not have any effect on the loaded sub-layout.

The Code is as follows:

The root layout file name is activity_main.xml. The xml file defines the following content:

 
  
Tools: context = ". MainActivity">
 

In the above root layout, the layout defined in table_layout.xml is added. The definition content of this xml file is:

     
  
   
Android: textSize = "30sp"/>
  
 

Code segment for dynamic loading in source code:

// Create the layout LinearLayout subLayout = (LinearLayout) this. getLayoutInflater (). inflate (R. layout. table_layout, null); // enter the table name tableNameTextView = (TextView) subLayout. findViewById (R. id. tableLayout_tableName); tableNameTextView. setText ("tablename"); this. addContentView (subLayout, new LayoutParams (LayoutParams. MATCH_PARENT, LayoutParams. WRAP_CONTENT ));

However, after the above code is executed, the margin settings in the table_layout layout will be displayed normally, but the edge of table_layout in the activity_main layout is closely tied to the edge of activity_main, which means that the padding of activity_main has no effect.

I am entangled in nearly three problems, and finally set the root part and the sub-layout of the margin and padding, respectively, set top, right, bottom, left neither, the final solution made me feel incredible:

You only need to add a layout in the root layout, and use this layout as the root layout to dynamically load the sub-layout.

I don't know why the root layout with identical types will go wrong. Maybe the 'root' layout has some special restrictions.

The modified code is:

Activity_main.xml:

Source code:

LinearLayout subLayout = (LinearLayout) this. getLayoutInflater (). inflate (R. layout. table_layout, null); // enter the table name tableNameTextView = (TextView) subLayout. findViewById (R. id. tableLayout_tableName); tableNameTextView. setText ("tablename"); LinearLayout mainLayout = (LinearLayout) findViewById (R. id. mainLayout); // load the sublayout mainLayout using the newly added "root layout. addView (subLayout );

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