Set RelativeLayout.ALIGN_PARENT_TOP/RelativeLayout.ALIGN_PARENT_BOTTOM using Java code

Example to set RelativeLayout.ALIGN_PARENT_TOP/RelativeLayout.ALIGN_PARENT_BOTTOM, using Java code, by calling addRule() of RelativeLayout.LayoutParams. To re-locate views in run-time.



Example:

package com.AndroidAlignParent;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class AndroidAlignParentActivity extends Activity {
 
 LinearLayout myLayout;
 
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       myLayout = (LinearLayout)findViewById(R.id.myLayout);
       Button btnAlignTop = (Button)findViewById(R.id.alignTop);
       Button btnAlignBottom = (Button)findViewById(R.id.alignBottom);
      
       btnAlignTop.setOnClickListener(new Button.OnClickListener(){

   public void onClick(View v) {
    // TODO Auto-generated method stub
    
    RelativeLayout.LayoutParams params
     = new RelativeLayout.LayoutParams(
       LayoutParams.FILL_PARENT,
       LayoutParams.WRAP_CONTENT);
    params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
    myLayout.setLayoutParams(params);
    
    Toast.makeText(AndroidAlignParentActivity.this,
      "ALIGN_PARENT_TOP",
      Toast.LENGTH_LONG).show();
   }});
      
       btnAlignBottom.setOnClickListener(new Button.OnClickListener(){

   public void onClick(View v) {
    // TODO Auto-generated method stub
    
    RelativeLayout.LayoutParams params
    = new RelativeLayout.LayoutParams(
      LayoutParams.FILL_PARENT,
      LayoutParams.WRAP_CONTENT);
    params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
    myLayout.setLayoutParams(params);
    
    Toast.makeText(AndroidAlignParentActivity.this,
      "ALIGN_PARENT_BOTTOM",
      Toast.LENGTH_LONG).show();
   }});
   }
}

<?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"
   >
<TextView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="@string/hello"
   />
<RelativeLayout
   android:id="@+id/parent"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:background="#FF333333"
   >
<LinearLayout
   android:id="@+id/myLayout"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:layout_alignParentBottom="true"
   android:background="#FF999999"
   >
<Button
   android:id="@+id/alignTop"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Align Parent Top"/>
<Button
   android:id="@+id/alignBottom"
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Align Parent Bottom"/>
</LinearLayout>
</RelativeLayout>
</LinearLayout>