Android Open Source - GeoLog Preference List Fragment

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License

The source code is released under:
Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUC...
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Java Source Code

/*
 * Copyright (C) 2013 Jorrit "Chainfire" Jongma
 * Copyright (C) 2010 The Android Open Source Project
 * //from   w  w w . ja va 2  s  . c o  m
 * (based on AOSP PreferenceFragment.java with some mods)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package eu.chainfire.geolog.ui;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.Preference;
import android.preference.PreferenceManager;
import android.preference.PreferenceScreen;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ListView;

public abstract class PreferenceListFragment extends ListFragment {   
    private PreferenceManager mPreferenceManager;
    
    /**
     * The starting request code given out to preference framework.
     */
    private static final int FIRST_REQUEST_CODE = 100;
    
    private static final int MSG_BIND_PREFERENCES = 0;
    @SuppressLint("HandlerLeak")
  private Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                
                case MSG_BIND_PREFERENCES:
                    bindPreferences();
                    break;
            }
        }
    };
    private ListView lv = null;
    private int xmlId;
    
    public PreferenceListFragment(int xmlId){
        this.xmlId = xmlId;
    }
    //must be provided
    public PreferenceListFragment(){
        
    }
        
    @Override
    public void onDestroyView(){
        super.onDestroyView();
/*
 * yada, breaks animation
 *         ViewParent p = lv.getParent();
        if(p != null)
            ((ViewGroup)p).removeView(lv);
            */
    }

    @Override
    public void onCreate(Bundle b) {
        super.onCreate(b);
        mPreferenceManager = onCreatePreferenceManager();    
    }
    
    @Override
  public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    lv = getListView();
        lv.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);                  
        setListShown(true);

        PreferenceScreen screen = createPreferenceHierarchy(mPreferenceManager);
        if (screen != null) setPreferenceScreen(screen);
        postBindPreferences();
        
      //((OnPreferenceAttachedListener)getActivity()).onPreferenceAttached(getPreferenceScreen(), 0);
  }
    
  protected abstract PreferenceScreen createPreferenceHierarchy(PreferenceManager prefMan);

    @Override
    public void onStop(){
        super.onStop();
        try{
            Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityStop");
            m.setAccessible(true);
            m.invoke(mPreferenceManager);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        lv = null;
        try{
            Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityDestroy");
            m.setAccessible(true);
            m.invoke(mPreferenceManager);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        outState.putInt("xml", xmlId);
        super.onSaveInstanceState(outState);

    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        try{
            Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityResult", int.class, int.class, Intent.class);
            m.setAccessible(true);
            m.invoke(mPreferenceManager, requestCode, resultCode, data);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    /**
     * Posts a message to bind the preferences to the list view.
     * <p>
     * Binding late is preferred as any custom preference types created in
     * {@link #onCreate(Bundle)} are able to have their views recycled.
     */
    private void postBindPreferences() {
        if (mHandler.hasMessages(MSG_BIND_PREFERENCES)) return;
        mHandler.obtainMessage(MSG_BIND_PREFERENCES).sendToTarget();
    }
    
    private void bindPreferences() {
        final PreferenceScreen preferenceScreen = getPreferenceScreen();
        if (preferenceScreen != null) {
          try {
            if (lv == null) lv = getListView();
            preferenceScreen.bind(lv);
          } catch (Exception e) {            
          }
        }
    }
    
    /**
     * Creates the {@link PreferenceManager}.
     * 
     * @return The {@link PreferenceManager} used by this activity.
     */
    private PreferenceManager onCreatePreferenceManager() {
        try{
            Constructor<PreferenceManager> c = PreferenceManager.class.getDeclaredConstructor(Activity.class, int.class);
            c.setAccessible(true);
            PreferenceManager preferenceManager = c.newInstance(this.getActivity(), FIRST_REQUEST_CODE);
            return preferenceManager;
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }
    
    /**
     * Returns the {@link PreferenceManager} used by this activity.
     * @return The {@link PreferenceManager}.
     */
    public PreferenceManager getPreferenceManager() {
        return mPreferenceManager;
    }

    /**
     * Sets the root of the preference hierarchy that this activity is showing.
     * 
     * @param preferenceScreen The root {@link PreferenceScreen} of the preference hierarchy.
     */
    public void setPreferenceScreen(PreferenceScreen preferenceScreen){
        try{
            Method m = PreferenceManager.class.getDeclaredMethod("setPreferences", PreferenceScreen.class);
            m.setAccessible(true);
            boolean result = (Boolean) m.invoke(mPreferenceManager, preferenceScreen);
            if (result && preferenceScreen != null) {
                postBindPreferences();
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    
    /**
     * Gets the root of the preference hierarchy that this activity is showing.
     * 
     * @return The {@link PreferenceScreen} that is the root of the preference
     *         hierarchy.
     */
    public PreferenceScreen getPreferenceScreen(){
        try{
            Method m = PreferenceManager.class.getDeclaredMethod("getPreferenceScreen");
            m.setAccessible(true);
            return (PreferenceScreen) m.invoke(mPreferenceManager);
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }
    }
    
    /**
     * Adds preferences from activities that match the given {@link Intent}.
     * 
     * @param intent The {@link Intent} to query activities.
     */
    public void addPreferencesFromIntent(Intent intent) {
        throw new RuntimeException("too lazy to include this bs");
    }
    
    /**
     * Inflates the given XML resource and adds the preference hierarchy to the current
     * preference hierarchy.
     * 
     * @param preferencesResId The XML resource ID to inflate.
     */
    public void addPreferencesFromResource(int preferencesResId) {   
        try{
            Method m = PreferenceManager.class.getDeclaredMethod("inflateFromResource", Context.class, int.class, PreferenceScreen.class);
            m.setAccessible(true);
            PreferenceScreen prefScreen = (PreferenceScreen) m.invoke(mPreferenceManager, getActivity(), preferencesResId, getPreferenceScreen());
            setPreferenceScreen(prefScreen);
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    
    /**
     * Finds a {@link Preference} based on its key.
     * 
     * @param key The key of the preference to retrieve.
     * @return The {@link Preference} with the key, or null.
     * @see PreferenceGroup#findPreference(CharSequence)
     */
    public Preference findPreference(CharSequence key) {
        if (mPreferenceManager == null) {
            return null;
        }
        return mPreferenceManager.findPreference(key);
    }
    
    public interface OnPreferenceAttachedListener {
        public void onPreferenceAttached(PreferenceScreen root, int xmlId);
    }
    
}
Java Source Code List
