Slider on my PreferenceScreen

Question

I want my preference menu to have something to change the duration of a vibration.

There is no slider tag for prefs.xml, so what is the best way to do this?

Answer 1

I improved the link provided by Macarse, so that the value is saved only on ok button click, and so that you can use @string/... values in the XML file.

Here is the code:

/* The following code was written by Matthew Wiggins   * and is released under the APACHE 2.0 license   *   * http://www.apache.org/licenses/LICENSE-2.0  *   * Improvements :  * - save the value on positive button click, not on seekbar change  * - handle @string/... values in xml file  */  package fr.atcm.carpooling.views.utils;  import android.app.AlertDialog; import android.content.Context; import android.os.Bundle; import android.preference.DialogPreference; import android.util.AttributeSet; import android.view.Gravity; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; import android.widget.SeekBar; import android.widget.TextView;   public class SeekBarPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener, OnClickListener {     // ------------------------------------------------------------------------------------------     // Private attributes :     private static final String androidns="http://schemas.android.com/apk/res/android";      private SeekBar mSeekBar;     private TextView mSplashText,mValueText;     private Context mContext;      private String mDialogMessage, mSuffix;     private int mDefault, mMax, mValue = 0;     // ------------------------------------------------------------------------------------------        // ------------------------------------------------------------------------------------------     // Constructor :     public SeekBarPreference(Context context, AttributeSet attrs) {          super(context,attrs);          mContext = context;          // Get string value for dialogMessage :         int mDialogMessageId = attrs.getAttributeResourceValue(androidns, "dialogMessage", 0);         if(mDialogMessageId == 0) mDialogMessage = attrs.getAttributeValue(androidns, "dialogMessage");         else mDialogMessage = mContext.getString(mDialogMessageId);          // Get string value for suffix (text attribute in xml file) :         int mSuffixId = attrs.getAttributeResourceValue(androidns, "text", 0);         if(mSuffixId == 0) mSuffix = attrs.getAttributeValue(androidns, "text");         else mSuffix = mContext.getString(mSuffixId);          // Get default and max seekbar values :         mDefault = attrs.getAttributeIntValue(androidns, "defaultValue", 0);         mMax = attrs.getAttributeIntValue(androidns, "max", 100);     }     // ------------------------------------------------------------------------------------------        // ------------------------------------------------------------------------------------------     // DialogPreference methods :     @Override      protected View onCreateDialogView() {          LinearLayout.LayoutParams params;         LinearLayout layout = new LinearLayout(mContext);         layout.setOrientation(LinearLayout.VERTICAL);         layout.setPadding(6,6,6,6);          mSplashText = new TextView(mContext);         mSplashText.setPadding(30, 10, 30, 10);         if (mDialogMessage != null)             mSplashText.setText(mDialogMessage);         layout.addView(mSplashText);          mValueText = new TextView(mContext);         mValueText.setGravity(Gravity.CENTER_HORIZONTAL);         mValueText.setTextSize(32);         params = new LinearLayout.LayoutParams(                 LinearLayout.LayoutParams.FILL_PARENT,                  LinearLayout.LayoutParams.WRAP_CONTENT);         layout.addView(mValueText, params);          mSeekBar = new SeekBar(mContext);         mSeekBar.setOnSeekBarChangeListener(this);         layout.addView(mSeekBar, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));          if (shouldPersist())             mValue = getPersistedInt(mDefault);          mSeekBar.setMax(mMax);         mSeekBar.setProgress(mValue);          return layout;     }      @Override      protected void onBindDialogView(View v) {         super.onBindDialogView(v);         mSeekBar.setMax(mMax);         mSeekBar.setProgress(mValue);     }      @Override     protected void onSetInitialValue(boolean restore, Object defaultValue)       {         super.onSetInitialValue(restore, defaultValue);         if (restore)              mValue = shouldPersist() ? getPersistedInt(mDefault) : 0;             else                  mValue = (Integer)defaultValue;     }     // ------------------------------------------------------------------------------------------        // ------------------------------------------------------------------------------------------     // OnSeekBarChangeListener methods :     @Override     public void onProgressChanged(SeekBar seek, int value, boolean fromTouch)     {         String t = String.valueOf(value);         mValueText.setText(mSuffix == null ? t : t.concat(" " + mSuffix));     }      @Override     public void onStartTrackingTouch(SeekBar seek) {}     @Override     public void onStopTrackingTouch(SeekBar seek) {}      public void setMax(int max) { mMax = max; }     public int getMax() { return mMax; }      public void setProgress(int progress) {          mValue = progress;         if (mSeekBar != null)             mSeekBar.setProgress(progress);      }     public int getProgress() { return mValue; }     // ------------------------------------------------------------------------------------------        // ------------------------------------------------------------------------------------------     // Set the positive button listener and onClick action :      @Override     public void showDialog(Bundle state) {          super.showDialog(state);          Button positiveButton = ((AlertDialog) getDialog()).getButton(AlertDialog.BUTTON_POSITIVE);         positiveButton.setOnClickListener(this);     }      @Override     public void onClick(View v) {          if (shouldPersist()) {              mValue = mSeekBar.getProgress();             persistInt(mSeekBar.getProgress());             callChangeListener(Integer.valueOf(mSeekBar.getProgress()));         }          ((AlertDialog) getDialog()).dismiss();     }     // ------------------------------------------------------------------------------------------ } 

EDIT :

Here is a screenshot :

EDIT : on arlomedia's demand, here are all the needed pieces of code (I just recreated a new projet, it is perfectly working. I corrected some bugs in SeekBarPreference class, so don't forget to re-copy/paste it) :

MainActivity :

package fr.at.testsliderpref;  import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem;  public class MainActivity extends Activity {      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);     }       @Override     public boolean onCreateOptionsMenu(Menu menu) {          getMenuInflater().inflate(R.menu.main, menu);         return true;     }      @Override     public boolean onMenuItemSelected(int featureId, MenuItem item) {          switch(item.getItemId()) {              case R.id.menu_settings : {                  startActivity(new Intent(this, SettingsActivity.class));                  break;             }         }          return true;         } } 

SettingsActivity :

package fr.at.testsliderpref;  import android.content.SharedPreferences; import android.content.SharedPreferences.OnSharedPreferenceChangeListener; import android.os.Bundle; import android.preference.PreferenceActivity; import android.preference.PreferenceFragment; import android.preference.PreferenceManager; import fr.at.testsliderpref.utils.SeekBarPreference;  public class SettingsActivity extends PreferenceActivity {      @Override     protected void onCreate(Bundle savedInstanceState) {          // Call super :         super.onCreate(savedInstanceState);          // Set the activity's fragment :         getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();     }       public static class SettingsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener {          private SeekBarPreference _seekBarPref;          @Override         public void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              // Load the preferences from an XML resource             addPreferencesFromResource(R.xml.activity_settings);               // Get widgets :             _seekBarPref = (SeekBarPreference) this.findPreference("SEEKBAR_VALUE");              // Set listener :             getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);              // Set seekbar summary :             int radius = PreferenceManager.getDefaultSharedPreferences(this.getActivity()).getInt("SEEKBAR_VALUE", 50);             _seekBarPref.setSummary(this.getString(R.string.settings_summary).replace("$1", ""+radius));         }          @Override         public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {              // Set seekbar summary :             int radius = PreferenceManager.getDefaultSharedPreferences(this.getActivity()).getInt("SEEKBAR_VALUE", 50);             _seekBarPref.setSummary(this.getString(R.string.settings_summary).replace("$1", ""+radius));         }     } } 

layout > activity_main.xml :

<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"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context=".MainActivity" >      <TextView         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="@string/textview_text" />  </RelativeLayout> 

menu > main.xml :

<menu xmlns:android="http://schemas.android.com/apk/res/android" >      <item         android:id="@+id/menu_settings"         android:title="@string/menu_settings"         android:icon="@android:drawable/ic_menu_preferences"/>  </menu> 

xml > activity_settings.xml :

<?xml version="1.0" encoding="utf-8"?> <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >          <fr.at.testsliderpref.utils.SeekBarPreference             android:defaultValue="50"             android:dialogMessage="@string/settings_dialog_message"             android:key="SEEKBAR_VALUE"             android:max="100"             android:summary="@string/settings_summary"             android:text="@string/settings_unit"             android:title="@string/settings_title" />  </PreferenceScreen> 

values > strings.xml :

<?xml version="1.0" encoding="utf-8"?> <resources>      <string name="app_name">TestSliderPref</string>     <string name="textview_text">SeekBarPreference test</string>      <string name="menu_settings">Settings</string>     <string name="settings_dialog_message">Here comes a message</string>     <string name="settings_summary">Current value is $1</string>     <string name="settings_unit">Km</string>     <string name="settings_title">Here comes the title</string>  </resources> 

Don't forget to add your SettingsActivity to the manifest, and it should be OK.

Answer 2

You could create your own Preference class that extends DialogPreference and shows a SeekBar as the dialog view.