title: Custom seekbar (thumb size, color and background)
body: <p>I would like to have this seekbar in my Android project :
  <a href="https://i.stack.imgur.com/M1ylD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/M1ylD.png" alt="enter image description here"></a></p>
  
  <p>This is my seekbar :</p>
  
  <pre><code>&lt;SeekBar
          android:id="@+id/seekBar_luminosite"
          android:layout_width="@dimen/seekbar_width"
          android:layout_height="@dimen/seekbar_height"
          android:minHeight="15dp"
          android:minWidth="15dp"
          android:maxHeight="15dp"
          android:maxWidth="15dp"
          android:progress="@integer/luminosite_defaut"
          android:progressDrawable="@drawable/custom_seekbar"
          android:thumb="@drawable/custom_thumb" /&gt;
  </code></pre>
  
  <p>This is my custom_thumb.xml :</p>
  
  <pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="oval" &gt;
  
      &lt;gradient
          android:angle="270"
          android:endColor="@color/colorDekraOrange"
          android:startColor="@color/colorDekraOrange" /&gt;
  
      &lt;size
          android:height="35dp"
          android:width="35dp" /&gt;
  
  &lt;/shape&gt;
  </code></pre>
  
  <p>This is my custom_seekbar.xml :</p>
  
  <pre><code>&lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android" &gt;
  
      &lt;item
          android:id="@android:id/background"
          android:drawable="@drawable/seekbar"/&gt;
      &lt;item android:id="@android:id/progress"&gt;
          &lt;clip android:drawable="@color/colorDekraYellow" /&gt;
      &lt;/item&gt;
  
  &lt;/layer-list&gt;
  </code></pre>
  
  <p>This is my seekbar.png (background) :</p>
  
  <p><a href="https://i.stack.imgur.com/MAvD6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/MAvD6.png" alt="enter image description here"></a></p>
  
  <p>And this is the result :
  <a href="https://i.stack.imgur.com/ZhVC6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ZhVC6.png" alt="enter image description here"></a></p>
  
  <p>No shadow and no rounded borders in the bar...</p>
  
  <p>I really not understand how I can do.</p>