Relativelayout of Android interface layout

The parameters of the Android relalivelayout layout are defined:

Android:layout_above= "@id/xxx"-puts the control on top of the given ID control
android:layout_below= "@id/xxx"-places the control under the given ID control

android:layout_toleftof= "@id/xxx"-Aligns the right edge of the control with the left edge of the given ID control
android:layout_torightof= "@id/xxx"-aligns the left edge of the control with the right edge of the given ID control

android:layout_alignleft= "@id/xxx"-aligns the left edge of the control with the left edge of the given ID control
android:layout_aligntop= "@id/xxx"-aligns the top edge of the control with the top edge of the given ID control
android:layout_alignright= "@id/xxx"-Aligns the right edge of the control with the right edge of the given ID control
android:layout_alignbottom= "@id/xxx"-Aligns the bottom edge of the control with the bottom edge of the given ID control
Android:layout_alignparentleft= "true"-aligns the left edge of the control with the left edge of the parent control
Android:layout_alignparenttop= "true"-aligns the top edge of the control with the top edge of the parent control
Android:layout_alignparentright= "true"-aligns the right edge of the control with the right edge of the parent control
Android:layout_alignparentbottom= "true"-aligns the bottom edge of the control with the bottom edge of the parent control
Android:layout_centerinparent= "true"--places the control in the center of the parent control
Android:layout_centerhorizontal= "true"--places the control in the center of the horizontal direction
Android:layout_centervertical= "true"--places the control in the center of the vertical direction

Programming Examples:

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Define Layout Activity_main.xml

<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android"

Android:id= "@+id/r1"

Android:layout_width= "Fill_parent"

android:layout_height= "Fill_parent"

android:background= "#edab4a" >

<button

Android:id= "@+id/shang"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

Android:layout_alignparenttop= "true"

Android:layout_centerhorizontal= "true"

android:text= "@string/shang"/>

<button

Android:id= "@+id/xia"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

Android:layout_alignparentbottom= "true"

Android:layout_centerhorizontal= "true"

android:text= "@string/xia"/>

<button

Android:id= "@+id/zuo"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

Android:layout_alignparentleft= "true"

Android:layout_centervertical= "true"

android:text= "@string/zuo"/>

<button

Android:id= "@+id/you"

Android:layout_width= "Wrap_content"

android:layout_height= "Wrap_content"

Android:layout_alignparentright= "true"

Android:layout_centervertical= "true"

android:text= "@string/you"/>

<imagebutton

android:contentdescription= "@string/wutu"

Android:id= "@+id/start"

Android:layout_width= "60dip"

android:layout_height= "100dip"

Android:layout_centerinparent= "true"

android:src= "@drawable/fengjing"/>

</RelativeLayout>

string Resource Sring.xml

<?xml version= "1.0" encoding= "Utf-8"?>

<resources>

<string name= "App_name" >RelativeLayout</string>

<string name= "Action_settings" >Settings</string>

<string name= "Hello_world" >hello world!</string>

<string name= "Shang" > on </string>

<string name= "Xia" > Under </string>

<string name= "Zuo" > Left </string>

<string name= "You" > right </string>

<string name= "Wutu" > No diagram </string>

<string name= "shuoming" > Picture description </string>

</resources>

Main activity Mainactivity.java

Package com.malakana.relativelayout;

Import Android.os.Bundle;

Import Android.view.View;

Import Android.view.View.OnClickListener;

Import Android.view.ViewGroup;

Import Android.widget.Button;

Import Android.widget.EditText;

Import Android.widget.ImageView;

Import Android.widget.RelativeLayout;

Import android.app.Activity;

public class Mainactivity extends Activity {

Relativelayout R1;

Button Shang;

Button Xia;

Button Zuo;

Button you;

ImageView Currbutton;

ImageView start;

@Override

protected void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.activity_main);

R1 = (relativelayout) Findviewbyid (R.ID.R1);

Shang = (Button) Findviewbyid (R.id.shang);

Xia = (Button) Findviewbyid (R.id.xia);

Zuo = (Button) Findviewbyid (R.id.zuo);

you = (Button) Findviewbyid (r.id.you);

Start = (ImageView) Findviewbyid (R.id.start);

Currbutton = start;

Shang.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View arg0) {

TODO auto-generated Method Stub

EditText temp = new EditText (mainactivity.this);

Temp.settext (r.string.shuoming);

Set Control position

Relativelayout.layoutparams lp_1 =

New Relativelayout.layoutparams (

viewgroup.layoutparams.wrap_content,95);

Lp_1.addrule (Relativelayout.above,currbutton.getid ()); ABOVE above the Currbutton

Lp_1.addrule (Relativelayout.center_horizontal,currbutton.getid ());

To add a control to a layout

R1.addview (temp,lp_1);

}});

Xia.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View arg0) {

TODO auto-generated Method Stub

EditText temp = new EditText (mainactivity.this);

Temp.settext (r.string.shuoming);

Set Control position

Relativelayout.layoutparams lp_1 =

New Relativelayout.layoutparams (

viewgroup.layoutparams.wrap_content,95);

Lp_1.addrule (Relativelayout.below,currbutton.getid ()); BELOW under the Currbutton

Lp_1.addrule (Relativelayout.center_horizontal,currbutton.getid ());

To add a control to a layout

R1.addview (temp,lp_1);

}});

Zuo.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View arg0) {

TODO auto-generated Method Stub

EditText temp = new EditText (mainactivity.this);

Temp.settext (r.string.shuoming);

Set Control position

Relativelayout.layoutparams lp_1 =

New Relativelayout.layoutparams (

viewgroup.layoutparams.wrap_content,95);

Lp_1.addrule (Relativelayout.left_of,currbutton.getid ()); Left_of aligns the right edge of the control and the left edge of the Currbutton

Lp_1.addrule (Relativelayout.center_vertical,currbutton.getid ()); Place the control in the center of the vertical direction

To add a control to a layout

R1.addview (temp,lp_1);

}});

You.setonclicklistener (New Onclicklistener () {

@Override

public void OnClick (View arg0) {

TODO auto-generated Method Stub

EditText temp = new EditText (mainactivity.this);

Temp.settext (r.string.shuoming);

Set Control position

Relativelayout.layoutparams lp_1 =

New Relativelayout.layoutparams (

viewgroup.layoutparams.wrap_content,95);

Lp_1.addrule (Relativelayout.right_of,currbutton.getid ()); Right_of aligns the left edge of the control with the right edge of the Currbutton

Lp_1.addrule (Relativelayout.center_vertical,currbutton.getid ()); Place the control in the center of the vertical direction

To add a control to a layout

R1.addview (temp,lp_1);

}});

}

}

：

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Relativelayout of Android interface layout