Android:gravity and Android:layout_gravity Properties

The LinearLayout has two very similar properties:

Android:gravity and Android:layout_gravity.

The difference between them is:

The Android:gravity property is the qualification for the content in the view. For example, a button above the text. You can set the text relative to the view's left, right, and so on.

Android:layout_gravity is used to set the location of the view relative to the parent view. For example, a button in the LinearLayout, you want to put the button in the LinearLayout left, on the right and so on can be set by this property.

That is, android:gravity is used to set the alignment of the content in the view relative to the view component.

The android:layout_gravity is used to set the alignment of the view component with respect to the container.

The principle is a bit similar to Android:paddingleft and Android:layout_marginleft. If both properties are set at the same time on the button.

Android:paddingleft= the content set on the 30px button is 30 pixels from the left edge of the button
Android:layout_marginleft= "30px" The entire button is set from the left side of the content 30 pixels

To get back to the point below, we can set the android:gravity= "center" to let the text in the EditText be centered in the EditText component, while we set the android:layout_gravity= of EditText " Right "to let the EditText component appear in the LinearLayout. Look at the effect:

As we can see, in EditText, where the text is already centered, and the EditText component itself is aligned to the right side of the linearlayout.

Attach the layout file:

[XHTML]View Plaincopyprint?

2. <LinearLayout
4. xmlns:android="http://schemas.android.com/apk/res/android"
6. android:orientation="vertical"
8. android:layout_width="fill_parent"
10. android:layout_height="fill_parent">
12. <EditText
14. android:layout_width="wrap_content"
16. android:gravity="center"
18. android:layout_height="wrap_content"
20. android:text="one"
22. android:layout_gravity="right"/>
24. </linearlayout>

Then the above is set by the way the layout file. , I believe everyone has written, so how to use Java code to set the location of the component?

Still consider achieving the above effect.

By looking at the SDK, there is a setgravity method that, as the name implies, is the way to set the alignment of the text in the button component.

Carefully find a lap, did not find Setlayoutgravity method, a little disappointed. But think about it too, if this is the way to put the button in a container that does not support the Layout_gravity property, how good!

So thought, this attribute may be in layout, so carefully looked at LinearLayout Layoutparams, sure enough to find, there is a gravity attribute, I believe this is used to set the component relative to the position of the container itself, yes, it should be him.

Practice found, if so, attach the code, you see for yourselves.

The code is relatively simple, but it took me a little time to find them.

[Java]View Plaincopyprint?

2. Button button = New button (this);
4. Button.settext ("one");
6. Linearlayout.layoutparams LP = New Linearlayout.layoutparams (LAYOUTPARAMS.WRAP_CONTENT,LAYOUTPARAMS.WRAP_  CONTENT);
8. This is equivalent to the Android:layout_gravity property in the layout file
10. lp.gravity = Gravity.right;
12. BUTTON.SETLAYOUTPARAMS (LP);
14. This is equivalent to the Android:gravity property in the layout file
16. Button.setgravity (Gravity.center);
20. LinearLayout linear = new LinearLayout (this);
22. Note that for linearlayout layouts, it is necessary to set landscape or portrait! Otherwise you will not see the effect.
24. Linear.setorientation (linearlayout.vertical);
26. Linear.addview (button);
28. Setcontentview (linear);

Or it can also:

[Java]View Plaincopyprint?

2. Button button = New button (this);
4. Button.settext ("one");
6. This is equivalent to the Android:gravity property in the layout file
8. Button.setgravity (Gravity.center);
12. LinearLayout linear = new LinearLayout (this);
14. Note that for linearlayout layouts, it is necessary to set landscape or portrait! Otherwise you will not see the effect.
16. Linear.setorientation (linearlayout.vertical);
20. Linearlayout.layoutparams LP = New Linearlayout.layoutparams (LAYOUTPARAMS.WRAP_CONTENT,LAYOUTPARAMS.WRAP_  CONTENT);
22. This is equivalent to the Android:layout_gravity property in the layout file
24. lp.gravity = Gravity.right;
28. Linear.addview (button, LP);
30. Setcontentview (linear);

Well, it's not going to be the same as above. That's all I'm talking about.

Also, to set the location in Relativelayout, use the Addrule method, as follows:

[Java]View Plaincopyprint?

1. params = new Relativelayout.layoutparams (Layoutparams.wrap_content, layoutparams.wrap_content);
2. Params.addrule (relativelayout.center_in_parent);
3. Mcontainer.addview (Progress,params);

If you find this article helpful, please leave a message to support, thank you very much!

Android:gravity and Android:layout_gravity Properties