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POAndroid: Banding on gradient background for navigation bar. setDither not working
 

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    <p>For some reason I can't get the background of my navbar to render smoothly. What am I doing wrong here? Here is my main activity xml file:</p> <pre><code>&lt;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" tools:context=".MainActivity" &gt; &lt;ImageView android:id="@+id/HomeBackground" android:layout_width="match_parent" android:layout_height="match_parent" android:contentDescription="@string/homescreen_desc" android:src="@drawable/homescreen" android:scaleType="centerCrop" /&gt; &lt;RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_above="@+id/NavigationBar"&gt;&lt;/RelativeLayout&gt; &lt;include android:layout_gravity="bottom" layout="@layout/navigation_main" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Here's the navigation bar that it loads:</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/NavigationBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:layout_alignParentBottom="true" android:padding="5dp" android:background="@drawable/gradient_bar_bg"&gt; &lt;LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"&gt; &lt;ImageButton android:id="@+id/home_button" android:contentDescription="@string/home_btn_txt" android:layout_width="40dp" android:layout_height="40dp" android:src="@drawable/home" android:scaleType="centerInside" android:tint="#176fe6" android:layout_marginLeft="15dp" android:layout_marginRight="15dp" android:background="@android:color/transparent"/&gt; &lt;ImageButton android:id="@+id/explore_button" android:contentDescription="@string/explore_btn_txt" android:layout_width="40dp" android:layout_height="40dp" android:src="@drawable/compass1" android:scaleType="centerInside" android:tint="#176fe6" android:layout_marginLeft="15dp" android:layout_marginRight="15dp" android:background="@android:color/transparent"/&gt; &lt;ImageButton android:id="@+id/info_button" android:contentDescription="@string/info_btn_txt" android:layout_width="40dp" android:layout_height="40dp" android:src="@drawable/info2" android:scaleType="centerInside" android:tint="#176fe6" android:layout_marginLeft="15dp" android:layout_marginRight="15dp" android:background="@android:color/transparent"/&gt; &lt;ImageButton android:id="@+id/social_button" android:contentDescription="@string/social_btn_txt" android:layout_width="40dp" android:layout_height="40dp" android:src="@drawable/chat" android:scaleType="centerInside" android:tint="#176fe6" android:layout_marginLeft="15dp" android:layout_marginRight="15dp" android:background="@android:color/transparent"/&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>Here's the gradient drawable:</p> <pre><code>&lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;item&gt; &lt;shape android:shape="rectangle"&gt; &lt;solid android:color="#004097" /&gt; &lt;/shape&gt; &lt;/item&gt; &lt;item android:top="2dp"&gt; &lt;shape&gt; &lt;gradient android:angle="90" android:startColor="#FF004097" android:endColor="#FF0153ca" android:type="linear" /&gt; &lt;/shape&gt; &lt;/item&gt; &lt;/layer-list&gt; </code></pre> <p>Finally, here's the activity:</p> <pre><code>package org.childrensmuseum.visittcmindy; import android.app.Activity; import android.os.Bundle; import android.view.Menu; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); getWindow().setFormat(PixelFormat.RGBA_8888); findViewById(R.id.NavigationBar).getBackground().setDither(true); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } } </code></pre>
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    1. COWell, I installed it to my phone, and the banding is gone. It only seems to be in the emulator. The only other difference is the emulator is running 4.2 simulating a Galaxy Nexus. My phone is an old Droid Incredible (1st generation) running Gingerbread. I'm getting a Galaxy S4 soon. I'll just have to see if the problem persists on that phone.
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