Android SweepGradient Example

Here is source code of the Program to Demonstrate Gradient Drawables in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

A GradientDrawable lets you design complex gradient fills. Each gradient defines a smooth transition between two or three colors in a linear, radial, or sweep pattern. Gradient Drawables are defi ned using the gradient tag as a subnode within a Shape Drawable definition (such as those defi ned in the preceding section). Each Gradient Drawable requires at least a startColor and endColor attribute and supports an optional middleColor. Using the type attribute you can define your gradient as one of the following:
1.Linear
2.Radial
3.Sweep

The following code shows a Sweep gradient within a ring , add the gradient.xml file in your /res/drawable directory.

Main Activity

package com.example.round_shape;
 
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.main, menu);
        return true;
    }
 
}

Actvity_Main

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/hello_world"
        android:background="@drawable/gradient"
         />
 
</RelativeLayout>

Gradient.xml

<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:innerRadiusRatio="3"
    android:shape="ring"
    android:thicknessRatio="8"
    android:useLevel="false" >
 
    <gradient
        android:centerColor="#000000"
        android:endColor="#ffffff"
        android:startColor="#ffffff"
        android:type="sweep"
        android:useLevel="false" />
 
</shape>

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