Implementasi PreferenceActivity (ActionBarCompat, PreferenceFragment)

advanced_preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- This is an advanced example showing the custom preference types and manually handling
     preference clicks. -->
<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- My custom preference type.  This just replaces the actual widget
         portion of the preference, if the whole preference wanted to be
         replaced we would use the layout attribute instead of the widgetLayout
         attribute. -->
    <com.sample.myapp.MyPreference
        android:key="my_preference"
        android:title="@string/title_my_preference"
        android:summary="@string/summary_my_preference"
        android:defaultValue="100" />

    <CheckBoxPreference
        android:key="advanced_checkbox_preference"
        android:title="@string/title_advanced_toggle_preference"
        android:summaryOn="@string/summary_on_advanced_toggle_preference"
        android:summaryOff="@string/summary_off_advanced_toggle_preference" />

</PreferenceScreen>

Apaini_PreferenceActivity.MD

PreferenceActivity support ActionBarCompat and PreferenceFragment.

fragmented_preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2010 The Android Open Source Project
     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.
-->

<!-- This is a primitive example showing the different types of preferences available. -->

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory
        android:title="@string/inline_preferences">

        <CheckBoxPreference
            android:key="checkbox_preference"
            android:title="@string/title_checkbox_preference"
            android:summary="@string/summary_checkbox_preference" />
        <!-- API Level 14
                <SwitchPreference
                        android:key="checkbox_preference"
                        android:title="@string/title_switch_preference"
                        android:summary="@string/summary_switch_preference" />
        -->
    </PreferenceCategory>

    <PreferenceCategory
        android:title="@string/dialog_based_preferences">

        <EditTextPreference
            android:key="edittext_preference"
            android:title="@string/title_edittext_preference"
            android:summary="@string/summary_edittext_preference"
            android:dialogTitle="@string/dialog_title_edittext_preference" />

        <ListPreference
            android:key="list_preference"
            android:title="@string/title_list_preference"
            android:summary="@string/summary_list_preference"
            android:entries="@array/entries_list_preference"
            android:entryValues="@array/entryvalues_list_preference"
            android:dialogTitle="@string/dialog_title_list_preference" />

    </PreferenceCategory>

    <PreferenceCategory
        android:title="@string/launch_preferences">

        <!-- This PreferenceScreen tag sends the user to a new fragment of
             preferences.  If running in a large screen, they can be embedded
             inside of the overall preferences UI. -->
        <PreferenceScreen
            android:fragment="com.sample.myapp.SettingsActivity$Prefs1FragmentInner"
            android:title="@string/title_fragment_preference"
            android:summary="@string/summary_fragment_preference">
            <!-- Arbitrary key/value pairs can be included for fragment arguments -->
            <extra android:name="someKey" android:value="somePrefValue" />
        </PreferenceScreen>

        <!-- This PreferenceScreen tag sends the user to a completely different
             activity, switching out of the current preferences UI. -->
        <PreferenceScreen
            android:title="@string/title_intent_preference"
            android:summary="@string/summary_intent_preference">

            <intent android:action="android.intent.action.VIEW"
                android:data="http://www.android.com" />

        </PreferenceScreen>

    </PreferenceCategory>

    <PreferenceCategory
        android:title="@string/preference_attributes">

        <CheckBoxPreference
            android:key="parent_checkbox_preference"
            android:title="@string/title_parent_preference"
            android:summary="@string/summary_parent_preference" />

        <!-- The visual style of a child is defined by this styled theme attribute. -->
        <CheckBoxPreference
            android:key="child_checkbox_preference"
            android:dependency="parent_checkbox_preference"
            android:layout="?android:attr/preferenceLayoutChild"
            android:title="@string/title_child_preference"
            android:summary="@string/summary_child_preference" />

    </PreferenceCategory>

</PreferenceScreen>

fragmented_preferences_inner.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2010 The Android Open Source Project
     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.
-->

<!-- This is a primitive example showing the different types of preferences available. -->

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">
    <CheckBoxPreference
        android:key="next_screen_checkbox_preference"
        android:title="@string/title_next_screen_toggle_preference"
        android:summary="@string/summary_next_screen_toggle_preference" />
</PreferenceScreen>

MainActivity.java

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
    }
    
    ...
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            ...
            case R.id.action_settings:
                Intent intentSettings = new Intent(this, SettingsActivity.class);
                /**
                 * Uncomment below to open specific fragment
                 */
                //intentSettings.putExtra( PreferenceActivity.EXTRA_SHOW_FRAGMENT, SettingsActivity.Prefs1Fragment.class.getName() );
                //intentSettings.putExtra( PreferenceActivity.EXTRA_NO_HEADERS, true );
                startActivity(intentSettings);
                return true;
            default:
                return false;
        }
    }
}

MyPreference.java

package com.sample.myapp;

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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.
 */

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.View;
import android.widget.TextView;

/**
 * This is an example of a custom preference type. The preference counts the
 * number of clicks it has received and stores/retrieves it from the storage.
 */
public class MyPreference extends Preference {
    private int mClickCounter;

    // This is the constructor called by the inflater
    public MyPreference(Context context, AttributeSet attrs) {
        super(context, attrs);

        setWidgetLayoutResource(R.layout.preference_widget_mypreference);
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);

        // Set our custom views inside the layout
        final TextView myTextView = (TextView) view.findViewById(R.id.mypreference_widget);
        if (myTextView != null) {
            myTextView.setText(String.valueOf(mClickCounter));
        }
    }

    @Override
    protected void onClick() {
        int newValue = mClickCounter + 1;
        // Give the client a chance to ignore this change if they deem it
        // invalid
        if (!callChangeListener(newValue)) {
            // They don't want the value to be set
            return;
        }

        // Increment counter
        mClickCounter = newValue;

        // Save to persistent storage (this method will make sure this
        // preference should be persistent, along with other useful checks)
        persistInt(mClickCounter);

        // Data has changed, notify so UI can be refreshed!
        notifyChanged();
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        // This preference type's value type is Integer, so we read the default
        // value from the attributes as an Integer.
        return a.getInteger(index, 0);
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        if (restoreValue) {
            // Restore state
            mClickCounter = getPersistedInt(mClickCounter);
        } else {
            // Set state
            int value = (Integer) defaultValue;
            mClickCounter = value;
            persistInt(value);
        }
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        /*
         * Suppose a client uses this preference type without persisting. We
         * must save the instance state so it is able to, for example, survive
         * orientation changes.
         */

        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            // No need to save instance state since it's persistent
            return superState;
        }

        // Save the instance state
        final SavedState myState = new SavedState(superState);
        myState.clickCounter = mClickCounter;
        return myState;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (!state.getClass().equals(SavedState.class)) {
            // Didn't save state for us in onSaveInstanceState
            super.onRestoreInstanceState(state);
            return;
        }

        // Restore the instance state
        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        mClickCounter = myState.clickCounter;
        notifyChanged();
    }

    /**
     * SavedState, a subclass of {@link BaseSavedState}, will store the state
     * of MyPreference, a subclass of Preference.
     * <p>
     * It is important to always call through to super methods.
     */
    private static class SavedState extends BaseSavedState {
        int clickCounter;

        public SavedState(Parcel source) {
            super(source);

            // Restore the click counter
            clickCounter = source.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);

            // Save the click counter
            dest.writeInt(clickCounter);
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {
                    public SavedState createFromParcel(Parcel in) {
                        return new SavedState(in);
                    }

                    public SavedState[] newArray(int size) {
                        return new SavedState[size];
                    }
                };
    }

}

preference_dependencies.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 The Android Open Source Project
     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.
-->

<!-- This is a primitive example showing how some preferences can depend on other preferences. -->
<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">

    <PreferenceCategory
        android:title="@string/example_preference_dependency">

        <CheckBoxPreference
            android:key="wifi"
            android:title="@string/title_wifi" />

        <EditTextPreference
            android:layout="?android:attr/preferenceLayoutChild"
            android:title="@string/title_wifi_settings"
            android:dependency="wifi" />

    </PreferenceCategory>

</PreferenceScreen>

preference_headers.xml

<?xml version="1.0" encoding="utf-8"?>
<preference-headers
    xmlns:android="http://schemas.android.com/apk/res/android">

    <header android:fragment="com.sample.myapp.SettingsActivity$Prefs1Fragment"
        android:icon="@mipmap/ic_settings_applications"
        android:title="Prefs 1"
        android:summary="An example of some preferences." />

    <header android:fragment="com.sample.myapp.SettingsActivity$Prefs2Fragment"
        android:icon="@mipmap/ic_settings_display"
        android:title="Prefs 2"
        android:summary="Some other preferences you can see.">
        <!-- Arbitrary key/value pairs can be included with a header as
             arguments to its fragment. -->
        <extra android:name="someKey" android:value="someHeaderValue" />
    </header>

    <header android:icon="@mipmap/ic_settings_display"
        android:title="Intent"
        android:summary="Launches an Intent.">
        <intent android:action="android.intent.action.VIEW"
            android:data="http://www.android.com" />
    </header>

</preference-headers>

SettingsActivity.java

public class SettingsActivity extends PreferenceActivity {
    private AppCompatDelegate mDelegate;
    private ActionBar bar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        getDelegate().installViewFactory();
        getDelegate().onCreate(savedInstanceState);
        super.onCreate(savedInstanceState);

        // Add a button to the header list.
        if (hasHeaders()) {
            Button button = new Button(this);
            button.setText("Some action");
            setListFooter(button);
        }

        bar = getSupportActionBar();
        bar.setDisplayHomeAsUpEnabled(true);
        bar.setTitle("Settings");
        bar.setElevation(0);
        
    }

    public void setActionBarTitle(String title){
        getSupportActionBar().setTitle(title);
    }

    /**
     * Populate the activity with the top-level headers.
     */
    @Override
    public void onBuildHeaders(List<Header> target) {
        loadHeadersFromResource(R.xml.preference_headers, target);
    }

    /**
     * This fragment shows the preferences for the first header.
     */
    public static class Prefs1Fragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            // Make sure default values are applied.  In a real app, you would
            // want this in a shared function that is used to retrieve the
            // SharedPreferences wherever they are needed.
            PreferenceManager.setDefaultValues(getActivity(),
                    R.xml.advanced_preferences, false);

            // Load the preferences from an XML resource
            addPreferencesFromResource(R.xml.fragmented_preferences);

            ((SettingsActivity) getActivity()).setActionBarTitle("Prefs1Fragment");

        }
    }

    /**
     * This fragment contains a second-level set of preference that you
     * can get to by tapping an item in the first preferences fragment.
     */
    public static class Prefs1FragmentInner extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            // Can retrieve arguments from preference XML.
            Log.i("args", "Arguments: " + getArguments());

            // Load the preferences from an XML resource
            addPreferencesFromResource(R.xml.fragmented_preferences_inner);
            ((SettingsActivity) getActivity()).initSummary(getPreferenceScreen());
            ((SettingsActivity) getActivity()).setActionBarTitle("Prefs1FragmentInner");
        }
        
        @Override
        public void onResume() {
            super.onResume();
            getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
        }

        @Override
        public void onPause() {
            getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
            super.onPause();
        }

        @Override
        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
            Preference pref = findPreference(key);
            ((SettingsActivity) getActivity()).updatePrefSummary(pref);
        }
    }

    /**
     * This fragment shows the preferences for the second header.
     */
    public static class Prefs2Fragment extends PreferenceFragment {
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            // Can retrieve arguments from headers XML.
            Log.i("args", "Arguments: " + getArguments());

            // Load the preferences from an XML resource
            addPreferencesFromResource(R.xml.preference_dependencies);

            ((SettingsActivity) getActivity()).setActionBarTitle("Prefs2Fragment");
        }
    }
    
    private void initSummary(Preference p) {
        if (p instanceof PreferenceGroup) {
            PreferenceGroup pGrp = (PreferenceGroup) p;
            for (int i = 0; i < pGrp.getPreferenceCount(); i++) {
                initSummary(pGrp.getPreference(i));
            }
        } else {
            updatePrefSummary(p);
        }
    }

    private void updatePrefSummary(Preference p) {
        if (p instanceof ListPreference) {
            ListPreference listPref = (ListPreference) p;
            p.setSummary(listPref.getEntry());
        }
        if (p instanceof EditTextPreference) {
            EditTextPreference editTextPref = (EditTextPreference) p;
            if (p.getTitle().toString().contains("assword"))
            {
                p.setSummary("******");
            } else {
                p.setSummary(editTextPref.getText());
            }
        }
        if (p instanceof MultiSelectListPreference) {
            EditTextPreference editTextPref = (EditTextPreference) p;
            p.setSummary(editTextPref.getText());
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                FragmentManager fm = getFragmentManager();
                if (fm.getBackStackEntryCount() > 0) {
                    Log.d("MainActivity", "popping backstack");
                    fm.popBackStack();
                } else {
                    Log.d("MainActivity", "nothing on backstack, calling super");
                    super.onBackPressed();
                }
                return(true);
        }

        return(super.onOptionsItemSelected(item));
    }
    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        getDelegate().onPostCreate(savedInstanceState);
    }

    public ActionBar getSupportActionBar() {
        return getDelegate().getSupportActionBar();
    }

    public void setSupportActionBar(@Nullable Toolbar toolbar) {
        getDelegate().setSupportActionBar(toolbar);
    }

    @Override
    public MenuInflater getMenuInflater() {
        return getDelegate().getMenuInflater();
    }

    @Override
    public void setContentView(@LayoutRes int layoutResID) {
        getDelegate().setContentView(layoutResID);
    }

    @Override
    public void setContentView(View view) {
        getDelegate().setContentView(view);
    }

    @Override
    public void setContentView(View view, ViewGroup.LayoutParams params) {
        getDelegate().setContentView(view, params);
    }

    @Override
    public void addContentView(View view, ViewGroup.LayoutParams params) {
        getDelegate().addContentView(view, params);
    }

    @Override
    protected void onPostResume() {
        super.onPostResume();
        getDelegate().onPostResume();
    }

    @Override
    protected void onTitleChanged(CharSequence title, int color) {
        super.onTitleChanged(title, color);
        getDelegate().setTitle(title);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        getDelegate().onConfigurationChanged(newConfig);
    }

    @Override
    protected void onStop() {
        super.onStop();
        getDelegate().onStop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        getDelegate().onDestroy();
    }

    public void invalidateOptionsMenu() {
        getDelegate().invalidateOptionsMenu();
    }

    private AppCompatDelegate getDelegate() {
        if (mDelegate == null) {
            mDelegate = AppCompatDelegate.create(this, null);
        }
        return mDelegate;
    }
}