title: How to set alpha value for my Relative layout?
body: <p>Hi I'm trying to set alpha value for my relative layout but, i am getting error how to solve this help me.....</p>
  
  <p>I have three layout in my xml layout 1st layout using for background 2nd layout using for header 3rd layout using for footer. I wish to set alpha value 2 &amp; 3rd layout so i am trying many ways still i have no idea please tell how to set alpha value </p>
  
  <p>xml code:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="wrap_content"
      android:layout_height="fill_parent"
      android:layout_alignParentLeft="true"
      android:orientation="vertical" 
      android:background="@drawable/blue"&gt;
  
      &lt;RelativeLayout
          xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="fill_parent"
          android:layout_height="60px"
          android:orientation="horizontal"
          android:layout_alignParentTop="true"
          android:background="@drawable/gradient_black"
          android:id="@+id/ttest"&gt;
         &lt;ImageView
              android:id="@+id/imageView1"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
  
          /&gt;
  
          &lt;TextView
              android:id="@+id/header_text"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:layout_centerVertical="true"
              android:layout_marginLeft="6dp"
              android:layout_toRightOf="@+id/imageView1"
              android:text="settings"
              android:textColor="@color/white"
              android:textSize="20sp" /&gt;
  
      &lt;/RelativeLayout&gt;
  
      &lt;RelativeLayout
          xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="fill_parent"
          android:layout_height="55px"
  
          android:background="@drawable/gradient_black"
          android:gravity="bottom"
          android:orientation="horizontal"
          android:layout_alignParentBottom="true" &gt;
    &lt;ImageView
              android:id="@+id/imageView2"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="ssss"
          /&gt;  
  
      &lt;/RelativeLayout&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>code:</p>
  
  <pre><code>public class DesignActivity extends Activity {
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
  
          int width = getWindowManager().getDefaultDisplay().getWidth();
          int height = getWindowManager().getDefaultDisplay().getHeight();
  
  
          ImageView imgHead = (ImageView)findViewById(R.id.imageView1);
  
          ImageView imgbottom = (ImageView)findViewById(R.id.imageView2);
  
  
          imgbottom.setImageResource(R.drawable.back);
          imgbottom.setLayoutParams(new RelativeLayout.LayoutParams(width/8, height/8));
  
  
          imgHead.setImageResource(R.drawable.b);
          imgHead.setLayoutParams(new RelativeLayout.LayoutParams(width/8, height/8));
       //   RelativeLayout relative = (RelativeLayout)findViewById(R.id.ttest);
  
      }
  }
  </code></pre>