move PreferenceController into settingLib/core

package com.android.settingslib.core;

import android.content.Context;

import android.support.v7.preference.Preference;

import android.support.v7.preference.PreferenceScreen;

import java.util.List;

/**

 * A controller that manages event for preference.

 */

public abstract class AbstractPreferenceController {

  protected final Context mContext;

  public AbstractPreferenceController(Context context) {

    mContext = context;

  }

  /**

   * Displays preference in this controller.

   */

  public void displayPreference(PreferenceScreen screen) {

      if (isAvailable()) {

          if (this instanceof Preference.OnPreferenceChangeListener) {

              final Preference preference = screen.findPreference(getPreferenceKey());

              preference.setOnPreferenceChangeListener(

                      (Preference.OnPreferenceChangeListener) this);

          }

      } else {

          removePreference(screen, getPreferenceKey());

      }

  }

  /**

   * Updates the current status of preference (summary, switch state, etc)

   */

  public void updateState(Preference preference) {

  }

  /**

   * Updates non-indexable keys for search provider.

   *

   * Called by SearchIndexProvider#getNonIndexableKeys

   */

  public void updateNonIndexableKeys(List<String> keys) {

      if (!isAvailable()) {

          keys.add(getPreferenceKey());

      }

  }

  /**

   * Returns true if preference is available (should be displayed)

   */

  public abstract boolean isAvailable();

  /**

   * Handles preference tree click

   *

   * @param preference the preference being clicked

   * @return true if click is handled

   */

  public boolean handlePreferenceTreeClick(Preference preference) {

      return false;

  }

  /**

   * Returns the key for this preference.

   */

  public abstract String getPreferenceKey();

  /**

   * Removes preference from screen.

   */

  protected final void removePreference(PreferenceScreen screen, String key) {

      Preference pref = screen.findPreference(key);

      if (pref != null) {

          screen.removePreference(pref);

      }

  }

}

    platform-robolectric-prebuilt

LOCAL_STATIC_JAVA_LIBRARIES := \

    android-support-v4 \

    android-support-v7-recyclerview \

    android-support-v7-preference \

    android-support-v7-appcompat \

    android-support-v14-preference \

    platform-system-robolectric \

    truth-prebuilt

/*

 * 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.android.settingslib.core;

import android.content.Context;

import android.support.v7.preference.Preference;

import android.support.v7.preference.PreferenceScreen;

import com.android.settingslib.TestConfig;

import com.android.settingslib.core.AbstractPreferenceController;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.mockito.Mock;

import org.mockito.MockitoAnnotations;

import org.robolectric.annotation.Config;

import org.robolectric.RobolectricTestRunner;

import static org.mockito.Matchers.any;

import static org.mockito.Mockito.never;

import static org.mockito.Mockito.verify;

import static org.mockito.Mockito.when;

@RunWith(RobolectricTestRunner.class)

@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)

public class PreferenceControllerTest {

    @Mock

    private Context mContext;

    @Mock

    private PreferenceScreen mScreen;

    @Mock

    private Preference mPreference;

    private TestPrefController mTestPrefController;

    @Before

    public void setUp() {

        MockitoAnnotations.initMocks(this);

        mTestPrefController = new TestPrefController(mContext);

    }

    @Test

    public void removeExistingPref_shouldBeRemoved() {

        when(mScreen.findPreference(TestPrefController.KEY_PREF)).thenReturn(mPreference);

        mTestPrefController.removePreference(mScreen, TestPrefController.KEY_PREF);

        verify(mScreen).removePreference(mPreference);

    }

    @Test

    public void removeNonExistingPref_shouldNotRemoveAnything() {

        mTestPrefController.removePreference(mScreen, TestPrefController.KEY_PREF);

        verify(mScreen, never()).removePreference(any(Preference.class));

    }

    @Test

    public void displayPref_ifAvailable() {

        mTestPrefController.isAvailable = true;

        mTestPrefController.displayPreference(mScreen);

        verify(mScreen, never()).removePreference(any(Preference.class));

    }

    @Test

    public void doNotDisplayPref_ifNotAvailable() {

        when(mScreen.findPreference(TestPrefController.KEY_PREF)).thenReturn(mPreference);

        mTestPrefController.isAvailable = false;

        mTestPrefController.displayPreference(mScreen);

        verify(mScreen).removePreference(any(Preference.class));

    }

    private class TestPrefController extends AbstractPreferenceController {

        private static final String KEY_PREF = "test_pref";

        public boolean isAvailable;

        public TestPrefController(Context context) {

            super(context);

        }

        @Override

        public boolean handlePreferenceTreeClick(Preference preference) {

            return false;

        }

        @Override

        public boolean isAvailable() {

            return isAvailable;

        }

        @Override

        public String getPreferenceKey() {

            return KEY_PREF;

        }

    }

}