src/com/android/wallpaper/picker/PreviewFragment.java - platform/packages/apps/WallpaperPicker2 - Git at Google

 /*
  * Copyright (C) 2017 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.wallpaper.picker;

 import static com.android.wallpaper.widget.BottomActionBar.BottomAction.APPLY;

 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.ColorStateList;
 import android.content.res.Resources.NotFoundException;
 import android.content.res.TypedArray;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.ContextThemeWrapper;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Toast;

 import androidx.annotation.CallSuper;
 import androidx.annotation.IdRes;
 import androidx.annotation.IntDef;
 import androidx.annotation.LayoutRes;
 import androidx.annotation.Nullable;
 import androidx.core.widget.ContentLoadingProgressBar;
 import androidx.fragment.app.FragmentActivity;

 import com.android.wallpaper.R;
 import com.android.wallpaper.model.LiveWallpaperInfo;
 import com.android.wallpaper.model.WallpaperInfo;
 import com.android.wallpaper.module.Injector;
 import com.android.wallpaper.module.InjectorProvider;
 import com.android.wallpaper.module.UserEventLogger;
 import com.android.wallpaper.module.WallpaperPersister.Destination;
 import com.android.wallpaper.module.WallpaperPreferences;
 import com.android.wallpaper.module.WallpaperSetter;
 import com.android.wallpaper.widget.BottomActionBar;

 import java.util.Date;
 import java.util.List;

 /**
  * Base Fragment to display the UI for previewing an individual wallpaper
  */
 public abstract class PreviewFragment extends AppbarFragment implements
         SetWallpaperDialogFragment.Listener, SetWallpaperErrorDialogFragment.Listener,
         LoadWallpaperErrorDialogFragment.Listener {

     /**
      * User can view wallpaper and attributions in full screen, but "Set wallpaper" button is
      * hidden.
      */
     static final int MODE_VIEW_ONLY = 0;

     /**
      * User can view wallpaper and attributions in full screen and click "Set wallpaper" to set the
      * wallpaper with pan and crop position to the device.
      */
     static final int MODE_CROP_AND_SET_WALLPAPER = 1;

     /**
      * Possible preview modes for the fragment.
      */
     @IntDef({
             MODE_VIEW_ONLY,
             MODE_CROP_AND_SET_WALLPAPER})
     public @interface PreviewMode {
     }

     public static final String ARG_WALLPAPER = "wallpaper";
     public static final String ARG_PREVIEW_MODE = "preview_mode";
     public static final String ARG_VIEW_AS_HOME = "view_as_home";
     public static final String ARG_TESTING_MODE_ENABLED = "testing_mode_enabled";

     /**
      * Creates and returns new instance of {@link ImagePreviewFragment} with the provided wallpaper
      * set as an argument.
      */
     public static PreviewFragment newInstance(WallpaperInfo wallpaperInfo, @PreviewMode int mode,
             boolean viewAsHome, boolean testingModeEnabled) {
         Bundle args = new Bundle();
         args.putParcelable(ARG_WALLPAPER, wallpaperInfo);
         args.putInt(ARG_PREVIEW_MODE, mode);
         args.putBoolean(ARG_VIEW_AS_HOME, viewAsHome);
         args.putBoolean(ARG_TESTING_MODE_ENABLED, testingModeEnabled);

         PreviewFragment fragment = wallpaperInfo instanceof LiveWallpaperInfo
                 ? new LivePreviewFragment() : new ImagePreviewFragment();
         fragment.setArguments(args);
         return fragment;
     }

     private static final String TAG_LOAD_WALLPAPER_ERROR_DIALOG_FRAGMENT =
             "load_wallpaper_error_dialog";
     private static final String TAG_SET_WALLPAPER_ERROR_DIALOG_FRAGMENT =
             "set_wallpaper_error_dialog";
     private static final int UNUSED_REQUEST_CODE = 1;
     private static final String TAG = "PreviewFragment";

     @PreviewMode
     protected int mPreviewMode;

     protected boolean mViewAsHome;

     /**
      * When true, enables a test mode of operation -- in which certain UI features are disabled to
      * allow for UI tests to run correctly. Works around issue in ProgressDialog currently where the
      * dialog constantly keeps the UI thread alive and blocks a test forever.
      */
     protected boolean mTestingModeEnabled;

     protected WallpaperInfo mWallpaper;
     protected WallpaperSetter mWallpaperSetter;
     protected UserEventLogger mUserEventLogger;
     protected BottomActionBar mBottomActionBar;
     protected ContentLoadingProgressBar mLoadingProgressBar;

     protected Intent mExploreIntent;
     protected CharSequence mActionLabel;

     /**
      * Staged error dialog fragments that were unable to be shown when the hosting activity didn't
      * allow committing fragment transactions.
      */
     private SetWallpaperErrorDialogFragment mStagedSetWallpaperErrorDialogFragment;
     private LoadWallpaperErrorDialogFragment mStagedLoadWallpaperErrorDialogFragment;

     protected static int getAttrColor(Context context, int attr) {
         TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
         int colorAccent = ta.getColor(0, 0);
         ta.recycle();
         return colorAccent;
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         Context appContext = getContext().getApplicationContext();
         Injector injector = InjectorProvider.getInjector();

         mUserEventLogger = injector.getUserEventLogger(appContext);
         mWallpaper = getArguments().getParcelable(ARG_WALLPAPER);

         //noinspection ResourceType
         mPreviewMode = getArguments().getInt(ARG_PREVIEW_MODE);
         mViewAsHome = getArguments().getBoolean(ARG_VIEW_AS_HOME);
         mTestingModeEnabled = getArguments().getBoolean(ARG_TESTING_MODE_ENABLED);
         mWallpaperSetter = new WallpaperSetter(injector.getWallpaperPersister(appContext),
                 injector.getPreferences(appContext), mUserEventLogger, mTestingModeEnabled);

         setHasOptionsMenu(true);

         Activity activity = getActivity();
         List<String> attributions = getAttributions(activity);
         if (attributions.size() > 0 && attributions.get(0) != null) {
             activity.setTitle(attributions.get(0));
         }
     }

     @Override
     @CallSuper
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         View view = inflater.inflate(getLayoutResId(), container, false);
         setUpToolbar(view);

         mLoadingProgressBar = view.findViewById(getLoadingIndicatorResId());
         mLoadingProgressBar.show();
         return view;
     }

     @Override
     protected void onBottomActionBarReady(BottomActionBar bottomActionBar) {
         mBottomActionBar = bottomActionBar;
         // TODO: Extract the common code here.
     }

     protected List<String> getAttributions(Context context) {
         return mWallpaper.getAttributions(context);
     }

     @LayoutRes
     protected abstract int getLayoutResId();

     @IdRes
     protected abstract int getLoadingIndicatorResId();

     protected int getDeviceDefaultTheme() {
         return android.R.style.Theme_DeviceDefault;
     }

     @Override
     public void onResume() {
         super.onResume();

         WallpaperPreferences preferences =
                 InjectorProvider.getInjector().getPreferences(getActivity());
         preferences.setLastAppActiveTimestamp(new Date().getTime());

         // Show the staged 'load wallpaper' or 'set wallpaper' error dialog fragments if there is
         // one that was unable to be shown earlier when this fragment's hosting activity didn't
         // allow committing fragment transactions.
         if (mStagedLoadWallpaperErrorDialogFragment != null) {
             mStagedLoadWallpaperErrorDialogFragment.show(
                     requireFragmentManager(), TAG_LOAD_WALLPAPER_ERROR_DIALOG_FRAGMENT);
             mStagedLoadWallpaperErrorDialogFragment = null;
         }
         if (mStagedSetWallpaperErrorDialogFragment != null) {
             mStagedSetWallpaperErrorDialogFragment.show(
                     requireFragmentManager(), TAG_SET_WALLPAPER_ERROR_DIALOG_FRAGMENT);
             mStagedSetWallpaperErrorDialogFragment = null;
         }
     }

     protected void setUpExploreIntentAndLabel(@Nullable Runnable callback) {
         Context context = getContext();
         if (context == null) {
             return;
         }

         WallpaperInfoHelper.loadExploreIntent(context, mWallpaper,
                 (actionLabel, exploreIntent) -> {
                     mActionLabel = actionLabel;
                     mExploreIntent = exploreIntent;
                     if (callback != null) {
                         callback.run();
                     }
                 }
         );
     }

     /**
      * Configure loading indicator with a MaterialProgressDrawable.
      */
     protected void setUpLoadingIndicator() {
         mLoadingProgressBar.setProgressTintList(ColorStateList.valueOf(getAttrColor(
                 new ContextThemeWrapper(requireContext(), getDeviceDefaultTheme()),
                 android.R.attr.colorAccent)));
         mLoadingProgressBar.show();
     }

     protected abstract boolean isLoaded();

     @Override
     public void onSet(int destination) {
         setCurrentWallpaper(destination);
     }

     @Override
     public void onDialogDismissed(boolean withItemSelected) {
         mBottomActionBar.deselectAction(APPLY);
     }

     @Override
     public void onClickTryAgain(@Destination int wallpaperDestination) {
         setCurrentWallpaper(wallpaperDestination);
     }

     @Override
     public void onClickOk() {
         FragmentActivity activity = getActivity();
         if (activity != null) {
             activity.finish();
         }
     }

     @Override
     public void onDestroy() {
         super.onDestroy();
         mWallpaperSetter.cleanUp();
     }

     @Override
     public CharSequence getDefaultTitle() {
         return getContext().getString(R.string.preview);
     }

     protected void onSetWallpaperClicked(View button) {
         mWallpaperSetter.requestDestination(getActivity(), getFragmentManager(), this,
                 mWallpaper instanceof LiveWallpaperInfo);
     }

     protected void onExploreClicked(View button) {
         if (getContext() == null) {
             return;
         }
         Context context = getContext();
         mUserEventLogger.logActionClicked(mWallpaper.getCollectionId(context),
                 mWallpaper.getActionLabelRes(context));

         startActivity(mExploreIntent);
     }

     /**
      * Sets current wallpaper to the device based on current zoom and scroll state.
      *
      * @param destination The wallpaper destination i.e. home vs. lockscreen vs. both.
      */
     protected abstract void setCurrentWallpaper(@Destination int destination);

     protected void finishActivity(boolean success) {
         Activity activity = requireActivity();
         if (success) {
             try {
                 Toast.makeText(activity,
                         R.string.wallpaper_set_successfully_message, Toast.LENGTH_SHORT).show();
             } catch (NotFoundException e) {
                 Log.e(TAG, "Could not show toast " + e);
             }
             activity.setResult(Activity.RESULT_OK);
         }
         activity.overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
         activity.finish();
     }

     protected void showSetWallpaperErrorDialog(@Destination int wallpaperDestination) {
         SetWallpaperErrorDialogFragment newFragment = SetWallpaperErrorDialogFragment.newInstance(
                 R.string.set_wallpaper_error_message, wallpaperDestination);
         newFragment.setTargetFragment(this, UNUSED_REQUEST_CODE);

         // Show 'set wallpaper' error dialog now if it's safe to commit fragment transactions,
         // otherwise stage it for later when the hosting activity is in a state to commit fragment
         // transactions.
         BasePreviewActivity activity = (BasePreviewActivity) requireActivity();
         if (activity.isSafeToCommitFragmentTransaction()) {
             newFragment.show(requireFragmentManager(), TAG_SET_WALLPAPER_ERROR_DIALOG_FRAGMENT);
         } else {
             mStagedSetWallpaperErrorDialogFragment = newFragment;
         }
     }

     /**
      * Shows 'load wallpaper' error dialog now or stage it to be shown when the hosting activity is
      * in a state that allows committing fragment transactions.
      */
     protected void showLoadWallpaperErrorDialog() {
         LoadWallpaperErrorDialogFragment dialogFragment =
                 LoadWallpaperErrorDialogFragment.newInstance();
         dialogFragment.setTargetFragment(this, UNUSED_REQUEST_CODE);

         // Show 'load wallpaper' error dialog now or stage it to be shown when the hosting
         // activity is in a state that allows committing fragment transactions.
         BasePreviewActivity activity = (BasePreviewActivity) getActivity();
         if (activity != null && activity.isSafeToCommitFragmentTransaction()) {
             dialogFragment.show(requireFragmentManager(), TAG_LOAD_WALLPAPER_ERROR_DIALOG_FRAGMENT);
         } else {
             mStagedLoadWallpaperErrorDialogFragment = dialogFragment;
         }
     }

     /**
      * Returns whether layout direction is RTL (or false for LTR). Since native RTL layout support
      * was added in API 17, returns false for versions lower than 17.
      */
     protected boolean isRtl() {
         return getResources().getConfiguration().getLayoutDirection()
                     == View.LAYOUT_DIRECTION_RTL;
     }
 }
	/*
	* Copyright (C) 2017 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.wallpaper.picker;

	import static com.android.wallpaper.widget.BottomActionBar.BottomAction.APPLY;

	import android.app.Activity;
	import android.content.Context;
	import android.content.Intent;
	import android.content.res.ColorStateList;
	import android.content.res.Resources.NotFoundException;
	import android.content.res.TypedArray;
	import android.os.Bundle;
	import android.util.Log;
	import android.view.ContextThemeWrapper;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.Toast;

	import androidx.annotation.CallSuper;
	import androidx.annotation.IdRes;
	import androidx.annotation.IntDef;
	import androidx.annotation.LayoutRes;
	import androidx.annotation.Nullable;
	import androidx.core.widget.ContentLoadingProgressBar;
	import androidx.fragment.app.FragmentActivity;

	import com.android.wallpaper.R;
	import com.android.wallpaper.model.LiveWallpaperInfo;
	import com.android.wallpaper.model.WallpaperInfo;
	import com.android.wallpaper.module.Injector;
	import com.android.wallpaper.module.InjectorProvider;
	import com.android.wallpaper.module.UserEventLogger;
	import com.android.wallpaper.module.WallpaperPersister.Destination;
	import com.android.wallpaper.module.WallpaperPreferences;
	import com.android.wallpaper.module.WallpaperSetter;
	import com.android.wallpaper.widget.BottomActionBar;

	import java.util.Date;
	import java.util.List;

	/**
	* Base Fragment to display the UI for previewing an individual wallpaper
	*/
	public abstract class PreviewFragment extends AppbarFragment implements
	SetWallpaperDialogFragment.Listener, SetWallpaperErrorDialogFragment.Listener,
	LoadWallpaperErrorDialogFragment.Listener {

	/**
	* User can view wallpaper and attributions in full screen, but "Set wallpaper" button is
	* hidden.
	*/
	static final int MODE_VIEW_ONLY = 0;

	/**
	* User can view wallpaper and attributions in full screen and click "Set wallpaper" to set the
	* wallpaper with pan and crop position to the device.
	*/
	static final int MODE_CROP_AND_SET_WALLPAPER = 1;

	/**
	* Possible preview modes for the fragment.
	*/
	@IntDef({
	MODE_VIEW_ONLY,
	MODE_CROP_AND_SET_WALLPAPER})
	public @interface PreviewMode {
	}

	public static final String ARG_WALLPAPER = "wallpaper";
	public static final String ARG_PREVIEW_MODE = "preview_mode";
	public static final String ARG_VIEW_AS_HOME = "view_as_home";
	public static final String ARG_TESTING_MODE_ENABLED = "testing_mode_enabled";

	/**
	* Creates and returns new instance of {@link ImagePreviewFragment} with the provided wallpaper
	* set as an argument.
	*/
	public static PreviewFragment newInstance(WallpaperInfo wallpaperInfo, @PreviewMode int mode,
	boolean viewAsHome, boolean testingModeEnabled) {
	Bundle args = new Bundle();
	args.putParcelable(ARG_WALLPAPER, wallpaperInfo);
	args.putInt(ARG_PREVIEW_MODE, mode);
	args.putBoolean(ARG_VIEW_AS_HOME, viewAsHome);
	args.putBoolean(ARG_TESTING_MODE_ENABLED, testingModeEnabled);

	PreviewFragment fragment = wallpaperInfo instanceof LiveWallpaperInfo
	? new LivePreviewFragment() : new ImagePreviewFragment();
	fragment.setArguments(args);
	return fragment;
	}

	private static final String TAG_LOAD_WALLPAPER_ERROR_DIALOG_FRAGMENT =
	"load_wallpaper_error_dialog";
	private static final String TAG_SET_WALLPAPER_ERROR_DIALOG_FRAGMENT =
	"set_wallpaper_error_dialog";
	private static final int UNUSED_REQUEST_CODE = 1;
	private static final String TAG = "PreviewFragment";

	@PreviewMode
	protected int mPreviewMode;

	protected boolean mViewAsHome;

	/**
	* When true, enables a test mode of operation -- in which certain UI features are disabled to
	* allow for UI tests to run correctly. Works around issue in ProgressDialog currently where the
	* dialog constantly keeps the UI thread alive and blocks a test forever.
	*/
	protected boolean mTestingModeEnabled;

	protected WallpaperInfo mWallpaper;
	protected WallpaperSetter mWallpaperSetter;
	protected UserEventLogger mUserEventLogger;
	protected BottomActionBar mBottomActionBar;
	protected ContentLoadingProgressBar mLoadingProgressBar;

	protected Intent mExploreIntent;
	protected CharSequence mActionLabel;

	/**
	* Staged error dialog fragments that were unable to be shown when the hosting activity didn't
	* allow committing fragment transactions.
	*/
	private SetWallpaperErrorDialogFragment mStagedSetWallpaperErrorDialogFragment;
	private LoadWallpaperErrorDialogFragment mStagedLoadWallpaperErrorDialogFragment;

	protected static int getAttrColor(Context context, int attr) {
	TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
	int colorAccent = ta.getColor(0, 0);
	ta.recycle();
	return colorAccent;
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	Context appContext = getContext().getApplicationContext();
	Injector injector = InjectorProvider.getInjector();

	mUserEventLogger = injector.getUserEventLogger(appContext);
	mWallpaper = getArguments().getParcelable(ARG_WALLPAPER);

	//noinspection ResourceType
	mPreviewMode = getArguments().getInt(ARG_PREVIEW_MODE);
	mViewAsHome = getArguments().getBoolean(ARG_VIEW_AS_HOME);
	mTestingModeEnabled = getArguments().getBoolean(ARG_TESTING_MODE_ENABLED);
	mWallpaperSetter = new WallpaperSetter(injector.getWallpaperPersister(appContext),
	injector.getPreferences(appContext), mUserEventLogger, mTestingModeEnabled);

	setHasOptionsMenu(true);

	Activity activity = getActivity();
	List<String> attributions = getAttributions(activity);
	if (attributions.size() > 0 && attributions.get(0) != null) {
	activity.setTitle(attributions.get(0));
	}
	}

	@Override
	@CallSuper
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	View view = inflater.inflate(getLayoutResId(), container, false);
	setUpToolbar(view);

	mLoadingProgressBar = view.findViewById(getLoadingIndicatorResId());
	mLoadingProgressBar.show();
	return view;
	}

	@Override
	protected void onBottomActionBarReady(BottomActionBar bottomActionBar) {
	mBottomActionBar = bottomActionBar;
	// TODO: Extract the common code here.
	}

	protected List<String> getAttributions(Context context) {
	return mWallpaper.getAttributions(context);
	}

	@LayoutRes
	protected abstract int getLayoutResId();

	@IdRes
	protected abstract int getLoadingIndicatorResId();

	protected int getDeviceDefaultTheme() {
	return android.R.style.Theme_DeviceDefault;
	}

	@Override
	public void onResume() {
	super.onResume();

	WallpaperPreferences preferences =
	InjectorProvider.getInjector().getPreferences(getActivity());
	preferences.setLastAppActiveTimestamp(new Date().getTime());

	// Show the staged 'load wallpaper' or 'set wallpaper' error dialog fragments if there is
	// one that was unable to be shown earlier when this fragment's hosting activity didn't
	// allow committing fragment transactions.
	if (mStagedLoadWallpaperErrorDialogFragment != null) {
	mStagedLoadWallpaperErrorDialogFragment.show(
	requireFragmentManager(), TAG_LOAD_WALLPAPER_ERROR_DIALOG_FRAGMENT);
	mStagedLoadWallpaperErrorDialogFragment = null;
	}
	if (mStagedSetWallpaperErrorDialogFragment != null) {
	mStagedSetWallpaperErrorDialogFragment.show(
	requireFragmentManager(), TAG_SET_WALLPAPER_ERROR_DIALOG_FRAGMENT);
	mStagedSetWallpaperErrorDialogFragment = null;
	}
	}

	protected void setUpExploreIntentAndLabel(@Nullable Runnable callback) {
	Context context = getContext();
	if (context == null) {
	return;
	}

	WallpaperInfoHelper.loadExploreIntent(context, mWallpaper,
	(actionLabel, exploreIntent) -> {
	mActionLabel = actionLabel;
	mExploreIntent = exploreIntent;
	if (callback != null) {
	callback.run();
	}
	}
	);
	}

	/**
	* Configure loading indicator with a MaterialProgressDrawable.
	*/
	protected void setUpLoadingIndicator() {
	mLoadingProgressBar.setProgressTintList(ColorStateList.valueOf(getAttrColor(
	new ContextThemeWrapper(requireContext(), getDeviceDefaultTheme()),
	android.R.attr.colorAccent)));
	mLoadingProgressBar.show();
	}

	protected abstract boolean isLoaded();

	@Override
	public void onSet(int destination) {
	setCurrentWallpaper(destination);
	}

	@Override
	public void onDialogDismissed(boolean withItemSelected) {
	mBottomActionBar.deselectAction(APPLY);
	}

	@Override
	public void onClickTryAgain(@Destination int wallpaperDestination) {
	setCurrentWallpaper(wallpaperDestination);
	}

	@Override
	public void onClickOk() {
	FragmentActivity activity = getActivity();
	if (activity != null) {
	activity.finish();
	}
	}

	@Override
	public void onDestroy() {
	super.onDestroy();
	mWallpaperSetter.cleanUp();
	}

	@Override
	public CharSequence getDefaultTitle() {
	return getContext().getString(R.string.preview);
	}

	protected void onSetWallpaperClicked(View button) {
	mWallpaperSetter.requestDestination(getActivity(), getFragmentManager(), this,
	mWallpaper instanceof LiveWallpaperInfo);
	}

	protected void onExploreClicked(View button) {
	if (getContext() == null) {
	return;
	}
	Context context = getContext();
	mUserEventLogger.logActionClicked(mWallpaper.getCollectionId(context),
	mWallpaper.getActionLabelRes(context));

	startActivity(mExploreIntent);
	}

	/**
	* Sets current wallpaper to the device based on current zoom and scroll state.
	*
	* @param destination The wallpaper destination i.e. home vs. lockscreen vs. both.
	*/
	protected abstract void setCurrentWallpaper(@Destination int destination);

	protected void finishActivity(boolean success) {
	Activity activity = requireActivity();
	if (success) {
	try {
	Toast.makeText(activity,
	R.string.wallpaper_set_successfully_message, Toast.LENGTH_SHORT).show();
	} catch (NotFoundException e) {
	Log.e(TAG, "Could not show toast " + e);
	}
	activity.setResult(Activity.RESULT_OK);
	}
	activity.overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
	activity.finish();
	}

	protected void showSetWallpaperErrorDialog(@Destination int wallpaperDestination) {
	SetWallpaperErrorDialogFragment newFragment = SetWallpaperErrorDialogFragment.newInstance(
	R.string.set_wallpaper_error_message, wallpaperDestination);
	newFragment.setTargetFragment(this, UNUSED_REQUEST_CODE);

	// Show 'set wallpaper' error dialog now if it's safe to commit fragment transactions,
	// otherwise stage it for later when the hosting activity is in a state to commit fragment
	// transactions.
	BasePreviewActivity activity = (BasePreviewActivity) requireActivity();
	if (activity.isSafeToCommitFragmentTransaction()) {
	newFragment.show(requireFragmentManager(), TAG_SET_WALLPAPER_ERROR_DIALOG_FRAGMENT);
	} else {
	mStagedSetWallpaperErrorDialogFragment = newFragment;
	}
	}

	/**
	* Shows 'load wallpaper' error dialog now or stage it to be shown when the hosting activity is
	* in a state that allows committing fragment transactions.
	*/
	protected void showLoadWallpaperErrorDialog() {
	LoadWallpaperErrorDialogFragment dialogFragment =
	LoadWallpaperErrorDialogFragment.newInstance();
	dialogFragment.setTargetFragment(this, UNUSED_REQUEST_CODE);

	// Show 'load wallpaper' error dialog now or stage it to be shown when the hosting
	// activity is in a state that allows committing fragment transactions.
	BasePreviewActivity activity = (BasePreviewActivity) getActivity();
	if (activity != null && activity.isSafeToCommitFragmentTransaction()) {
	dialogFragment.show(requireFragmentManager(), TAG_LOAD_WALLPAPER_ERROR_DIALOG_FRAGMENT);
	} else {
	mStagedLoadWallpaperErrorDialogFragment = dialogFragment;
	}
	}

	/**
	* Returns whether layout direction is RTL (or false for LTR). Since native RTL layout support
	* was added in API 17, returns false for versions lower than 17.
	*/
	protected boolean isRtl() {
	return getResources().getConfiguration().getLayoutDirection()
	== View.LAYOUT_DIRECTION_RTL;
	}
	}