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POHow to set onChangeListener for seekBar which is in preferences?
 

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  1. POHow to set onChangeListener for seekBar which is in preferences?
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    <p>How can I set OnChangeListener for seekbar which is in preferences(pic <a href="http://img825.imageshack.us/img825/6729/prefscreen.png" rel="nofollow">http://img825.imageshack.us/img825/6729/prefscreen.png</a>)? I already tried this code but it will return with null pointer exception:</p> <p>PreferenceActivity:</p> <pre><code>import android.os.Bundle; import android.preference.Preference; import android.preference.PreferenceActivity; import android.widget.SeekBar; public class peferences extends PreferenceActivity { private SeekBar SensitivitySeekBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.preferences); SensitivitySeekBar = (SeekBar)findViewById(R.id.SeekBar2); SensitivitySeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub } }); } </code></pre> <p>Preferences.xml:</p> <pre><code>&lt;PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;PreferenceCategory android:title="@string/pref_accelerometer_title" android:key="preference_accelerometer" &gt; &lt;CheckBoxPreference android:key="pref_key_x_axis" android:summary="@string/preference_x_axis_summary" android:title="Use x-axis" android:defaultValue="true" android:order="1" android:enabled="true"/&gt; &lt;CheckBoxPreference android:title="Use y-axis" android:key="pref_key_y_axis" android:summary="@string/preference_y_axis_summary" android:order="2" android:enabled="true" android:defaultValue="true"/&gt; &lt;CheckBoxPreference android:summary="@string/preference_z_axis_summary" android:title="Use z-axis" android:key="pref_key_z_axis" android:order="3" android:enabled="true" android:defaultValue="true"/&gt; &lt;CheckBoxPreference android:title="Accelerometer value" android:key="pref_accelerometer_value" android:summary="@string/preference_show_accelerometer_value"/&gt; &lt;Preference android:layout="@layout/seekbar" android:order="4" android:key="seekbar"/&gt; &lt;/PreferenceCategory&gt; &lt;/PreferenceScreen&gt; </code></pre> <p>Layout for seekbar:</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;TextView android:id="@+id/Sensitivity_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="10dp" android:layout_marginTop="15dp" android:text="@string/preference_sensitivity_title" android:textAppearance="?android:attr/textAppearanceMedium" /&gt; &lt;TextView android:id="@+id/Sensitivity_summary" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/Sensitivity_title" android:layout_below="@+id/Sensitivity_title" android:text="@string/preference_sensitivity_summary" /&gt; &lt;SeekBar android:id="@+id/seekBar2" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/Sensitivity_summary" android:max="5000" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>Log:</p> <pre><code>12-26 22:55:35.204: D/dalvikvm(24291): GC_CONCURRENT freed 329K, 4% free 9212K/9572K, paused 4ms+5ms, total 29ms 12-26 22:55:36.626: D/AndroidRuntime(24291): Shutting down VM 12-26 22:55:36.626: W/dalvikvm(24291): threadid=1: thread exiting with uncaught exception (group=0x4154e930) 12-26 22:55:36.634: E/AndroidRuntime(24291): FATAL EXCEPTION: main 12-26 22:55:36.634: E/AndroidRuntime(24291): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bluetoothc/com.example.bluetoothc.peferences}: java.lang.NullPointerException 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.ActivityThread.access$600(ActivityThread.java:141) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.os.Handler.dispatchMessage(Handler.java:99) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.os.Looper.loop(Looper.java:137) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-26 22:55:36.634: E/AndroidRuntime(24291): at java.lang.reflect.Method.invokeNative(Native Method) 12-26 22:55:36.634: E/AndroidRuntime(24291): at java.lang.reflect.Method.invoke(Method.java:511) 12-26 22:55:36.634: E/AndroidRuntime(24291): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-26 22:55:36.634: E/AndroidRuntime(24291): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-26 22:55:36.634: E/AndroidRuntime(24291): at dalvik.system.NativeStart.main(Native Method) 12-26 22:55:36.634: E/AndroidRuntime(24291): Caused by: java.lang.NullPointerException 12-26 22:55:36.634: E/AndroidRuntime(24291): at com.example.bluetoothc.peferences.onCreate(peferences.java:23) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.Activity.performCreate(Activity.java:5104) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 12-26 22:55:36.634: E/AndroidRuntime(24291): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 12-26 22:55:36.634: E/AndroidRuntime(24291): ... 11 more 12-26 22:55:39.001: I/Process(24291): Sending signal. PID: 24291 SIG: 9 </code></pre>
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      1. POHow to set onChangeListener for seekBar which is in preferences?
      1. USMikhaili
    2. COthat is not how you add a `SeekBar` to a preference xml. you're getting a null pointer because the SeekBar doesn't in fact exist in the view created from the xml. here's an example of how it can be done: http://robobunny.com/wp/2011/08/13/android-seekbar-preference/
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      1. USmango
 

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