Table of contents
Relative to the layout of a certain control
Layout introduction
Operation:
Enter the default xml file, first delete the components inside, then adjust it to split form, click on the display box, right-click to enter the convent view, and the following selection box will appear.
Note: Failure to delete components may result in the following selection box appearing
Intervention：
LinearLayout represents a linear layout, that is, the included controls are arranged linearly.
RelativeLayout represents a relative layout, that is, the included controls can appear anywhere in the layout through relative positioning.
FrameLayout represents the frame layout, that is, the included controls are in the default position (upper left corner).
Linear LayoutLinearLayout
Note: height and width must be set towrap_content. If set to match_parent, overwriting will occur. .
Arrangement
Remove the default TextView control and add the following properties to the LinearLayout control:
android:orientation="horizontal"1.android:orientation = "horizontal"Specify the arrangement of controls in the layout as Horizontalarrangement
2.android:orientation = "vertical"Specify the arrangement of controls in the layout as Verticallyarrange
3. If not set, thendefault levelarrangement
ButtonButton settings
Add three buttons:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button1"
android:text="1"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="2"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button3"
android:text="3"
/>The control is displayed horizontally by default:
Generally, the length and width of a control cannot be set to 0.
When height or width is set to 0, the weight needs to be set so that its width or length is not controlled by height or width, but its proportion is controlled by the weight. as follows:
Show only one button setting:
<Button
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="2"
android:gravity="left"
android:layout_weight="2"
/>In the example, the width is set to 0dp, while the lower part is set to left alignment and the weight is 3. After setting several other buttons, the width is allocated according to the weight proportion.
gravity is used to set the alignment of the control, layout_weight sets the weight of the control.
Set the width of the three controls to 0dp, the alignment to left, and the proportions to 3, 2, and 1, as shown below:
Input box EditText settings
EditText control is used to set the input box, where:hint is used to set the prompt text of the input box
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/edittext1"
android:hint="pls input something"
android:layout_weight="1"
/>Effect: (EditText and Button overall proportion distribution)
RelativeLayout
relatively overall layout
| Field | Effect |
| layout_alignParentTop |
above view |
| layout_alignParentButtom | below the view |
| layout_alignParentLeft | on the left side of the view |
| layout_alignParentRight | on the right side of the view |
| layout_centerInParent | in the middle of the view |
Set five buttons
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:text="1"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:text="2"
/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="3"
/>
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:text="4"
/>
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:text="5"
/>Effect:
Relative to the layout of a certain control
| Field | Effect |
| layout_above | above the specified control |
| layout_below | below the specified control |
| layout_toLeftOf | Located to the left of the specified control |
| layout_toRightOf | Located to the right of the specified control |
| layout_centerInParent | in the middle of the view |
Set five buttons
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@id/button3"
android:layout_toLeftOf="@id/button3"
android:text="1"
/>
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@id/button3"
android:layout_toRightOf="@id/button3"
android:text="2"
/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="3"
/>
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/button3"
android:layout_toLeftOf="@id/button3"
android:text="4"
/>
<Button
android:id="@+id/button5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/button3"
android:layout_toRightOf="@id/button3"
android:text="5"
/>Effect:
frame layout
Default layout, all controls are in the default position (upper left corner)