Android : Linear Gradient not being displayed in some android devices

I am creating a gradient using the Linear Gradient in android on a canvas object. I am using this gradient by including the class in my main layout xml. The code generating the gradient is:

public class BackgroundGradient extends View{

    private Resources res;
    private int [] colors;
  private float [] pos;
  private Paint paint;
  private Shader shader;

  public BackgroundGradient(Context context) {
    // TODO Auto-generated constructor stub
    super(context);
    init();
  }

  public BackgroundGradient(Context context, AttributeSet attrs) {
    // TODO Auto-generated constructor stub
    super(context,attrs);
    init();
  }

  public BackgroundGradient(Context context, AttributeSet attrs, int defStyle) {
    // TODO Auto-generated constructor stub
    super(context,attrs,defStyle);
    init();
  }

  private void init() {
    paint  = new Paint();
    res    = getResources();
    colors = new int[10];
    pos    = new float[10];

    int[] c = { //array of colors };

    float[] p = { //positions };

    for (int i = 0; i < 8; i++) {
      colors[i] = c[i];
      pos[i]    = p[i];
    }
  }

  @Override
  protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      this.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
  }
    shader = new LinearGradient(0,getHeight(),getWidth(), 0, colors, pos, Shader.TileMode.CLAMP);
    paint.setShader(shader); 
    canvas.rotate(20, 0, getHeight());
    canvas.drawPaint(paint);

  }

}

So, above is the file that I included in my activity_main.xml inside a frame layout. Content of activity_main :

<FrameLayout
    android:id="@+id/content_frame"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <include layout="@layout/bg_gradient" />


    <LinearLayout 
      android:layout_width="match_parent"
      android:layout_height="5dp"
      android:background="#000"
      android:orientation="horizontal">

      <TextView android:id="@+id/pager_strip"
        android:layout_width="100dp"
        android:layout_height="5dp"
        android:background="@color/mu_blue_6"/>

    </LinearLayout>
    <!-- other views -->  

  </FrameLayout>

Content of bg_gradient.xml:

    <?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
  <FrameLayout 
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <!-- 
    <Button
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        android:textColor="#000000"
        android:text="This is button" />  -->  

    <in.mubpack.b2o.ui.BackgroundGradient
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />
  </FrameLayout>
</merge>

I cannot figure out why the gradient is visible in some Android devices and not in others. Need help.!!