Linear layout of Android Development

I. Basic Knowledge:

Id = "@ + id/edtInput", which is a bridge between the UI and code

Layout_width = "fill_parent", automatically filled to the screen width

Layout_width = "wrap_content", automatically filled into the control size

 

Controls in LinearLayout are arranged horizontally or vertically:

Orientation = "horizontal": horizontal arrangement;

Orientation = "vertical": vertical arrangement

 

Use android: layout_weight to specify the percentage (weight ).

In the case of nested LinearLayout, The sublinearlayout must be set with the permission value. Otherwise, the default situation is that the sublinearlayout without the permission value occupies the entire screen.

 

Android: id -- specify the corresponding ID for the control

Android: text -- specify the text displayed in the control. Note that strings in the strings. xml file should be used as much as possible here.

Android: grimace -- specifies the basic position of the control, such as center and right.

Android: textSize -- specifies the font size in the control.

Android: background -- specifies the background color used by the control. The RGB naming method is used.

Android: width -- specify the width of the control

Android: height -- specify the height of the control

Android: padding * -- specifies the padding of the control, that is, the content in the control.

Android: sigleLine -- if set to true, the control content is displayed in the same row.

 

Ii. Code display:

1. "Acticity_05srcyanacticity_05MainActivity.java"

[Java]

Package yan. acticity_05;

 

Import android. OS. Bundle;

Import android. app. Activity;

Import android. view. Menu;

 

Public class MainActivity extends Activity {

 

@ Override

Protected void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. activity_main );

}

 

@ Override

Public boolean onCreateOptionsMenu (Menu menu ){

// Inflate the menu; this adds items to the action bar if it is present.

GetMenuInflater (). inflate (R. menu. activity_main, menu );

Return true;

}

 

}

Package yan. acticity_05;

Import android. OS. Bundle;

Import android. app. Activity;

Import android. view. Menu;

Public class MainActivity extends Activity {

@ Override

Protected void onCreate (Bundle savedInstanceState ){

Super. onCreate (savedInstanceState );

SetContentView (R. layout. activity_main );

}

@ Override

Public boolean onCreateOptionsMenu (Menu menu ){

// Inflate the menu; this adds items to the action bar if it is present.

GetMenuInflater (). inflate (R. menu. activity_main, menu );

Return true;

}

}

 

2. "Acticity_05reslayoutactivity_main.xml"

[Html]

<? Xml version = "1.0" encoding = "UTF-8"?>

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"

Android: orientation = "vertical"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

>

<! --

Code editing prompt shortcut: Alt +/

 

Id = "@ + id/edtInput", which is a bridge between the UI and code

Layout_width = "fill_parent", automatically filled to the screen width

Layout_width = "wrap_content", automatically filled into the control size

Controls in LinearLayout are arranged horizontally or vertically:

Orientation = "horizontal": horizontal arrangement;

Orientation = "vertical": vertical arrangement

Android: id -- specify the corresponding ID for the control

Android: text -- specify the text displayed in the control. Note that strings in the strings. xml file should be used as much as possible here.

Android: grimace -- specifies the basic position of the control, such as center and right.

Android: textSize -- specifies the font size in the control.

Android: background -- specifies the background color used by the control. The RGB naming method is used.

Android: width -- specify the width of the control

Android: height -- specify the height of the control

Android: padding * -- specifies the padding of the control, that is, the content in the control.

Android: sigleLine -- if set to true, the control content is displayed in the same row.

-->

<EditText

Android: id = "@ + id/edtInput"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: text = "@ + string/hello_world"

/>

 

<Button

Android: id = "@ + id/myButton"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

/>

 

<TextView

Android: id = "@ + id/firstText"

Android: text = "TextView first line"

Android: gravity = "center_vertical"

Android: textSize = "15pt"

Android: background = "# aa0000"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: layout_weight = "10000"

Android: singleLine = "true"/>

<TextView

Android: id = "@ + id/secondText"

Android: text = "TextView Row 2"

Android: gravity = "center_vertical"

Android: textSize = "15pt"

Android: background = "# tianaa"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: layout_weight = "1"/>

</LinearLayout>

<? Xml version = "1.0" encoding = "UTF-8"?>

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"

Android: orientation = "vertical"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"

>

<! --

Code editing prompt shortcut: Alt +/

Id = "@ + id/edtInput", which is a bridge between the UI and code

Layout_width = "fill_parent", automatically filled to the screen width

Layout_width = "wrap_content", automatically filled into the control size

Controls in LinearLayout are arranged horizontally or vertically:

Orientation = "horizontal": horizontal arrangement;

Orientation = "vertical": vertical arrangement

Android: id -- specify the corresponding ID for the control

Android: text -- specify the text displayed in the control. Note that strings in the strings. xml file should be used as much as possible here.

Android: grimace -- specifies the basic position of the control, such as center and right.

Android: textSize -- specifies the font size in the control.

Android: background -- specifies the background color used by the control. The RGB naming method is used.

Android: width -- specify the width of the control

Android: height -- specify the height of the control

Android: padding * -- specifies the padding of the control, that is, the content in the control.

Android: sigleLine -- if set to true, the control content is displayed in the same row.

-->

<EditText

Android: id = "@ + id/edtInput"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: text = "@ + string/hello_world"

/>

<Button

Android: id = "@ + id/myButton"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

/>

<TextView

Android: id = "@ + id/firstText"

Android: text = "TextView first line"

Android: gravity = "center_vertical"

Android: textSize = "15pt"

Android: background = "# aa0000"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: layout_weight = "10000"

Android: singleLine = "true"/>

<TextView

Android: id = "@ + id/secondText"

Android: text = "TextView Row 2"

Android: gravity = "center_vertical"

Android: textSize = "15pt"

Android: background = "# tianaa"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: layout_weight = "1"/>

</LinearLayout>

 

Iii. effect display: