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POcustom ProgressBarPreference issue in Android
 

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    <p>I'm trying to implement a custom ProgressBarPreference, adding at the bottom of a default preference a ProgressBar and a TextView, and granting the methods of the progressbar like setProgress() or setMax() for changing it. Here's my code works except the updating the progress within onCreate or onResume for example, how can I allow to set the progress in those points ? (actually is giving a null pointer exception over mProgressBar):</p> <p>ProgressBarPreference.java</p> <pre><code>public class ProgressBarPreference extends Preference { public ProgressBarPreference(Context context) { super(context); } public ProgressBarPreference(Context context, AttributeSet attrs) { super(context, attrs); } public ProgressBarPreference(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } ProgressBar mProgressBar; @Override protected View onCreateView(ViewGroup parent) { LayoutInflater li = (LayoutInflater) Manager.appcontext.getSystemService(Service.LAYOUT_INFLATER_SERVICE); View myLayout=li.inflate(R.layout.progressbarpreference, null, false); ((ViewGroup)myLayout.findViewById(R.id.preference_super_container)).addView(super.onCreateView(parent)); mProgressBar=(ProgressBar) myLayout.findViewById(R.id.preference_progress_bar); return myLayout; } public void setProgress(int value){ mProgressBar.setProgress(value); } } </code></pre> <p>progressbarpreference.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;LinearLayout android:id="@+id/preference_super_container" android:layout_height="wrap_content" android:layout_width="fill_parent" android:orientation="vertical" &gt;&lt;/LinearLayout&gt; &lt;RelativeLayout android:id="@+id/relativeLayout1" android:layout_height="wrap_content" android:layout_width="fill_parent" android:paddingLeft="20sp" android:paddingRight="20sp" &gt; &lt;TextView android:layout_alignParentRight="true" android:text="0 new of 100" android:id="@+id/preference_progress_label" android:layout_height="wrap_content" android:layout_width="wrap_content" android:gravity="center" android:layout_centerVertical="true" android:paddingLeft="15sp" android:textColor="#FFFFFF" &gt;&lt;/TextView&gt; &lt;ProgressBar style="?android:attr/progressBarStyleHorizontal" android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/preference_progress_bar" android:layout_centerVertical="true" android:progress="50" android:layout_toLeftOf="@id/preference_progress_label" android:layout_alignParentLeft="true" &gt;&lt;/ProgressBar&gt; &lt;/RelativeLayout&gt; &lt;/LinearLayout&gt; </code></pre>
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