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POStrange behavior of inflated buttons when changing one's color
 

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    <p>I am trying to implement a dynamic button inflation for my Android application, based on an input specified by the user in real time. When clicked, button changes its color from blue to red.</p> <p>The code responsible for this goes as follows:</p> <pre><code>LayoutInflater layoutsInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); LinearLayout linearLayout = (LinearLayout) findViewById(R.id.layout_for_buttons); // Let's say that now we need only 3 buttons: for (int i = 0; i &lt; 3; i++) { RelativeLayout buttonLayout = (RelativeLayout) layoutsInflater .inflate(R.layout.button_layout, linearLayout, false); Button button = (Button) buttonLayout.getChildAt(0); button.setText("Button " + i); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View buttonView) { Button button = (Button) buttonView; GradientDrawable gradientDrawable = (GradientDrawable) button .getBackground(); gradientDrawable.setColor(Color.RED); gradientDrawable.invalidateSelf(); } }); linearLayout.addView(buttonLayout); linearLayout.invalidate(); } </code></pre> <p>Layout that I append buttons to is a simple <code>LinearLayout</code>:</p> <pre><code>&lt;LinearLayout android:id="@+id/layout_for_buttons" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;/LinearLayout&gt; </code></pre> <p>Inflated <code>button_layout</code> is a <code>RelativeLayout</code> consisting of a <code>Button</code> and a <code>TextView</code>:</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="10sp" &gt; &lt;Button android:id="@+id/button_view" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="@drawable/button_bg" android:gravity="left" android:paddingBottom="7dip" android:paddingLeft="50sp" android:paddingTop="7dip" android:textColor="#FFFFFF" android:textSize="20sp" /&gt; &lt;TextView android:id="@+id/label_view" android:layout_width="24dip" android:layout_height="24dip" android:layout_marginLeft="13dip" android:layout_marginTop="8dip" android:gravity="center" android:text="Hi" android:textColor="#FFFFFF" android:textSize="20sp" android:textStyle="bold" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p><code>@drawable/button_bg</code> is a <code>shape</code> in blue color:</p> <pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:padding="10dp" android:shape="rectangle" &gt; &lt;solid android:color="#0000ff" /&gt; &lt;corners android:radius="10dp" /&gt; &lt;/shape&gt; </code></pre> <p>Now, when I run the application everything seems to be fine. After being clicked, first button unsurprisingly turns red:</p> <p><img src="https://i.stack.imgur.com/UgkXe.png" alt="enter image description here"></p> <p>When I close and re-run the application every single button is blue, and that is a behavior that matches up to my expectations. The problem is, when I <strong>re-run the application for the second time</strong>, every button turns red (as if it has been clicked):</p> <p><img src="https://i.stack.imgur.com/BAItG.png" alt="enter image description here"></p> <p>As it is written in a documentation, <code>inflate</code> method should <strong>inflate a new view hierarchy</strong> based on a given XML, so what could be responsible for this? I thought that the same <code>GradientDrawable</code> might be shared among every inflated button, but debugger shows that each button has its own <code>GradientDrawable</code> instance.</p>
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