SettingsFragment.java

/*
 * Copyright (C) 2016 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.
 */

package com.example.android.tvleanback.ui;

import android.content.Intent;
import android.os.Bundle;
import android.support.v14.preference.PreferenceFragment;
import android.support.v17.preference.LeanbackPreferenceFragment;
import android.support.v17.preference.LeanbackSettingsFragment;
import android.support.v7.preference.DialogPreference;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;

import com.example.android.tvleanback.R;

public class SettingsFragment extends LeanbackSettingsFragment
        implements DialogPreference.TargetFragment {
    private final static String PREFERENCE_RESOURCE_ID = "preferenceResource";
    private final static String PREFERENCE_ROOT = "root";
    private PreferenceFragment mPreferenceFragment;

    @Override
    public void onPreferenceStartInitialScreen() {
        mPreferenceFragment = buildPreferenceFragment(R.xml.settings, null);
        startPreferenceFragment(mPreferenceFragment);
    }

    @Override
    public boolean onPreferenceStartFragment(PreferenceFragment preferenceFragment,
        Preference preference) {
        return false;
    }

    @Override
    public boolean onPreferenceStartScreen(PreferenceFragment preferenceFragment,
        PreferenceScreen preferenceScreen) {
        PreferenceFragment frag = buildPreferenceFragment(R.xml.settings,
            preferenceScreen.getKey());
        startPreferenceFragment(frag);
        return true;
    }

    @Override
    public Preference findPreference(CharSequence charSequence) {
        return mPreferenceFragment.findPreference(charSequence);
    }

    private PreferenceFragment buildPreferenceFragment(int preferenceResId, String root) {
        PreferenceFragment fragment = new PrefFragment();
        Bundle args = new Bundle();
        args.putInt(PREFERENCE_RESOURCE_ID, preferenceResId);
        args.putString(PREFERENCE_ROOT, root);
        fragment.setArguments(args);
        return fragment;
    }

    private class PrefFragment extends LeanbackPreferenceFragment {

        @Override
        public void onCreatePreferences(Bundle bundle, String s) {
            String root = getArguments().getString(PREFERENCE_ROOT, null);
            int prefResId = getArguments().getInt(PREFERENCE_RESOURCE_ID);
            if (root == null) {
                addPreferencesFromResource(prefResId);
            } else {
                setPreferencesFromResource(prefResId, root);
            }
        }

        @Override
        public boolean onPreferenceTreeClick(Preference preference) {
            if (preference.getKey().equals(getString(R.string.pref_key_login))) {
                // Open an AuthenticationActivity
                startActivity(new Intent(getActivity(), AuthenticationActivity.class));
            }
            return super.onPreferenceTreeClick(preference);
        }
    }
}