/*
* Copyright (C) 2011 Google Inc.
* Licensed to 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.ex.photo.fragments;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.android.ex.photo.Intents;
import com.android.ex.photo.PhotoViewCallbacks;
import com.android.ex.photo.PhotoViewCallbacks.CursorChangedListener;
import com.android.ex.photo.PhotoViewCallbacks.OnScreenListener;
import com.android.ex.photo.PhotoViewController.ActivityInterface;
import com.android.ex.photo.R;
import com.android.ex.photo.adapters.PhotoPagerAdapter;
import com.android.ex.photo.loaders.PhotoBitmapLoaderInterface;
import com.android.ex.photo.loaders.PhotoBitmapLoaderInterface.BitmapResult;
import com.android.ex.photo.views.PhotoView;
import com.android.ex.photo.views.ProgressBarWrapper;
/**
* Displays a photo.
*/
public class PhotoViewFragment extends Fragment implements
LoaderManager.LoaderCallbacks<BitmapResult>,
OnClickListener,
OnScreenListener,
CursorChangedListener {
/**
* Interface for components that are internally scrollable left-to-right.
*/
public static interface HorizontallyScrollable {
/**
* Return {@code true} if the component needs to receive right-to-left
* touch movements.
*
* @param origX the raw x coordinate of the initial touch
* @param origY the raw y coordinate of the initial touch
*/
public boolean interceptMoveLeft(float origX, float origY);
/**
* Return {@code true} if the component needs to receive left-to-right
* touch movements.
*
* @param origX the raw x coordinate of the initial touch
* @param origY the raw y coordinate of the initial touch
*/
public boolean interceptMoveRight(float origX, float origY);
}
protected final static String STATE_INTENT_KEY =
"com.android.mail.photo.fragments.PhotoViewFragment.INTENT";
protected final static String ARG_INTENT = "arg-intent";
protected final static String ARG_POSITION = "arg-position";
protected final static String ARG_SHOW_SPINNER = "arg-show-spinner";
/** The URL of a photo to display */
protected String mResolvedPhotoUri;
protected String mThumbnailUri;
/** The intent we were launched with */
protected Intent mIntent;
protected PhotoViewCallbacks mCallback;
protected PhotoPagerAdapter mAdapter;
protected BroadcastReceiver mInternetStateReceiver;
protected PhotoView mPhotoView;
protected ImageView mPhotoPreviewImage;
protected TextView mEmptyText;
protected ImageView mRetryButton;
protected ProgressBarWrapper mPhotoProgressBar;
protected int mPosition;
/** Whether or not the fragment should make the photo full-screen */
protected boolean mFullScreen;
/**
* True if the PhotoViewFragment should watch the network state in order to restart loaders.
*/
protected boolean mWatchNetworkState;
/** Whether or not this fragment will only show the loading spinner */
protected boolean mOnlyShowSpinner;
/** Whether or not the progress bar is showing valid information about the progress stated */
protected boolean mProgressBarNeeded = true;
protected View mPhotoPreviewAndProgress;
protected boolean mThumbnailShown;
/** Whether or not there is currently a connection to the internet */
protected boolean mConnected;
/** Whether or not we can display the thumbnail at fullscreen size */
protected boolean mDisplayThumbsFullScreen;
/** Public no-arg constructor for allowing the framework to handle orientation changes */
public PhotoViewFragment() {
// Do nothing.
}
/**
* Create a {@link PhotoViewFragment}.
* @param intent
* @param position
* @param onlyShowSpinner
*/
public static PhotoViewFragment newInstance(
Intent intent, int position, boolean onlyShowSpinner) {
final PhotoViewFragment f = new PhotoViewFragment();
initializeArguments(intent, position, onlyShowSpinner, f);
return f;
}
public static void initializeArguments(
Intent intent, int position, boolean onlyShowSpinner, PhotoViewFragment f) {
final Bundle b = new Bundle();
b.putParcelable(ARG_INTENT, intent);
b.putInt(ARG_POSITION, position);
b.putBoolean(ARG_SHOW_SPINNER, onlyShowSpinner);
f.setArguments(b);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mCallback = getCallbacks();
if (mCallback == null) {
throw new IllegalArgumentException(
"Activity must be a derived class of PhotoViewActivity");
}
mAdapter = mCallback.getAdapter();
if (mAdapter == null) {
throw new IllegalStateException("Callback reported null adapter");
}
// Don't call until we've setup the entire view
setViewVisibility();
}
protected PhotoViewCallbacks getCallbacks() {
return ((ActivityInterface) getActivity()).getController();
}
@Override
public void onDetach() {
mCallback = null;
super.onDetach();
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Bundle bundle = getArguments();
if (bundle == null) {
return;
}
mIntent = bundle.getParcelable(ARG_INTENT);
mDisplayThumbsFullScreen = mIntent.getBooleanExtra(
Intents.EXTRA_DISPLAY_THUMBS_FULLSCREEN, false);
mPosition = bundle.getInt(ARG_POSITION);
mOnlyShowSpinner = bundle.getBoolean(ARG_SHOW_SPINNER);
mProgressBarNeeded = true;
if (savedInstanceState != null) {
final Bundle state = savedInstanceState.getBundle(STATE_INTENT_KEY);
if (state != null) {
mIntent = new Intent().putExtras(state);
}
}
if (mIntent != null) {
mResolvedPhotoUri = mIntent.getStringExtra(Intents.EXTRA_RESOLVED_PHOTO_URI);
mThumbnailUri = mIntent.getStringExtra(Intents.EXTRA_THUMBNAIL_URI);
mWatchNetworkState = mIntent.getBooleanExtra(Intents.EXTRA_WATCH_NETWORK, false);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.photo_fragment_view, container, false);
initializeView(view);
return view;
}
protected void initializeView(View view) {
mPhotoView = (PhotoView) view.findViewById(R.id.photo_view);
mPhotoView.setMaxInitialScale(mIntent.getFloatExtra(Intents.EXTRA_MAX_INITIAL_SCALE, 1));
mPhotoView.setOnClickListener(this);
mPhotoView.setFullScreen(mFullScreen, false);
mPhotoView.enableImageTransforms(false);
mPhotoPreviewAndProgress = view.findViewById(R.id.photo_preview);
mPhotoPreviewImage = (ImageView) view.findViewById(R.id.photo_preview_image);
mThumbnailShown = false;
final ProgressBar indeterminate =
(ProgressBar) view.findViewById(R.id.indeterminate_progress);
final ProgressBar determinate =
(ProgressBar) view.findViewById(R.id.determinate_progress);
mPhotoProgressBar = new ProgressBarWrapper(determinate, indeterminate, true);
mEmptyText = (TextView) view.findViewById(R.id.empty_text);
mRetryButton = (ImageView) view.findViewById(R.id.retry_button);
// Don't call until we've setup the entire view
setViewVisibility();
}
@Override
public void onResume() {
super.onResume();
mCallback.addScreenListener(mPosition, this);
mCallback.addCursorListener(this);
if (mWatchNetworkState) {
if (mInternetStateReceiver == null) {
mInternetStateReceiver = new InternetStateBroadcastReceiver();
}
getActivity().registerReceiver(mInternetStateReceiver,
new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
ConnectivityManager connectivityManager = (ConnectivityManager)
getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
if (activeNetInfo != null) {
mConnected = activeNetInfo.isConnected();
} else {
// Best to set this to false, since it won't stop us from trying to download,
// only allow us to try re-download if we get notified that we do have a connection.
mConnected = false;
}
}
if (!isPhotoBound()) {
mProgressBarNeeded = true;
mPhotoPreviewAndProgress.setVisibility(View.VISIBLE);
getLoaderManager().initLoader(PhotoViewCallbacks.BITMAP_LOADER_THUMBNAIL,
null, this);
// FLAG: If we are displaying thumbnails at fullscreen size, then we
// could defer the loading of the fullscreen image until the thumbnail
// has finished loading, or even until the user attempts to zoom in.
getLoaderManager().initLoader(PhotoViewCallbacks.BITMAP_LOADER_PHOTO,
null, this);
}
}
@Override
public void onPause() {
// Remove listeners
if (mWatchNetworkState) {
getActivity().unregisterReceiver(mInternetStateReceiver);
}
mCallback.removeCursorListener(this);
mCallback.removeScreenListener(mPosition);
resetPhotoView();
super.onPause();
}
@Override
public void onDestroyView() {
// Clean up views and other components
if (mPhotoView != null) {
mPhotoView.clear();
mPhotoView = null;
}
super.onDestroyView();
}
public String getPhotoUri() {
return mResolvedPhotoUri;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (mIntent != null) {
outState.putParcelable(STATE_INTENT_KEY, mIntent.getExtras());
}
}
@Override
public Loader<BitmapResult> onCreateLoader(int id, Bundle args) {
if(mOnlyShowSpinner) {
return null;
}
String uri = null;
switch (id) {
case PhotoViewCallbacks.BITMAP_LOADER_THUMBNAIL:
uri = mThumbnailUri;
break;
case PhotoViewCallbacks.BITMAP_LOADER_PHOTO:
uri = mResolvedPhotoUri;
break;
}
return mCallback.onCreateBitmapLoader(id, args, uri);
}
@Override
public void onLoadFinished(Loader<BitmapResult> loader, BitmapResult result) {
// If we don't have a view, the fragment has been paused. We'll get the cursor again later.
// If we're not added, the fragment has detached during the loading process. We no longer
// need the result.
if (getView() == null || !isAdded()) {
return;
}
final Drawable data = result.getDrawable(getResources());
final int id = loader.getId();
switch (id) {
case PhotoViewCallbacks.BITMAP_LOADER_THUMBNAIL:
if (mDisplayThumbsFullScreen) {
displayPhoto(result);
} else {
if (isPhotoBound()) {
// There is need to do anything with the thumbnail
// image, as the full size image is being shown.
return;
}
if (data == null) {
// no preview, show default
mPhotoPreviewImage.setImageResource(R.drawable.default_image);
mThumbnailShown = false;
} else {
// show preview
mPhotoPreviewImage.setImageDrawable(data);
mThumbnailShown = true;
}
mPhotoPreviewImage.setVisibility(View.VISIBLE);
if (getResources().getBoolean(R.bool.force_thumbnail_no_scaling)) {
mPhotoPreviewImage.setScaleType(ImageView.ScaleType.CENTER);
}
enableImageTransforms(false);
}
break;
case PhotoViewCallbacks.BITMAP_LOADER_PHOTO:
displayPhoto(result);
break;
default:
break;
}
if (mProgressBarNeeded == false) {
// Hide the progress bar as it isn't needed anymore.
mPhotoProgressBar.setVisibility(View.GONE);
}
if (data != null) {
mCallback.onNewPhotoLoaded(mPosition);
}
setViewVisibility();
}
private void displayPhoto(BitmapResult result) {
if (result.status == BitmapResult.STATUS_EXCEPTION) {
mProgressBarNeeded = false;
mEmptyText.setText(R.string.failed);
mEmptyText.setVisibility(View.VISIBLE);
mCallback.onFragmentPhotoLoadComplete(this, false /* success */);
} else {
mEmptyText.setVisibility(View.GONE);
final Drawable data = result.getDrawable(getResources());
bindPhoto(data);
mCallback.onFragmentPhotoLoadComplete(this, true /* success */);
}
}
/**
* Binds an image to the photo view.
*/
private void bindPhoto(Drawable drawable) {
if (drawable != null) {
if (mPhotoView != null) {
mPhotoView.bindDrawable(drawable);
}
enableImageTransforms(true);
mPhotoPreviewAndProgress.setVisibility(View.GONE);
mProgressBarNeeded = false;
}
}
public Drawable getDrawable() {
return (mPhotoView != null ? mPhotoView.getDrawable() : null);
}
/**
* Enable or disable image transformations. When transformations are enabled, this view
* consumes all touch events.
*/
public void enableImageTransforms(boolean enable) {
mPhotoView.enableImageTransforms(enable);
}
/**
* Resets the photo view to it's default state w/ no bound photo.
*/
private void resetPhotoView() {
if (mPhotoView != null) {
mPhotoView.bindPhoto(null);
}
}
@Override
public void onLoaderReset(Loader<BitmapResult> loader) {
// Do nothing
}
@Override
public void onClick(View v) {
mCallback.toggleFullScreen();
}
@Override
public void onFullScreenChanged(boolean fullScreen) {
setViewVisibility();
}
@Override
public void onViewUpNext() {
resetViews();
}
@Override
public void onViewActivated() {
if (!mCallback.isFragmentActive(this)) {
// we're not in the foreground; reset our view
resetViews();
} else {
if (!isPhotoBound()) {
// Restart the loader
getLoaderManager().restartLoader(PhotoViewCallbacks.BITMAP_LOADER_THUMBNAIL,
null, this);
}
mCallback.onFragmentVisible(this);
}
}
/**
* Reset the views to their default states
*/
public void resetViews() {
if (mPhotoView != null) {
mPhotoView.resetTransformations();
}
}
@Override
public boolean onInterceptMoveLeft(float origX, float origY) {
if (!mCallback.isFragmentActive(this)) {
// we're not in the foreground; don't intercept any touches
return false;
}
return (mPhotoView != null && mPhotoView.interceptMoveLeft(origX, origY));
}
@Override
public boolean onInterceptMoveRight(float origX, float origY) {
if (!mCallback.isFragmentActive(this)) {
// we're not in the foreground; don't intercept any touches
return false;
}
return (mPhotoView != null && mPhotoView.interceptMoveRight(origX, origY));
}
/**
* Returns {@code true} if a photo has been bound. Otherwise, returns {@code false}.
*/
public boolean isPhotoBound() {
return (mPhotoView != null && mPhotoView.isPhotoBound());
}
/**
* Sets view visibility depending upon whether or not we're in "full screen" mode.
*/
private void setViewVisibility() {
final boolean fullScreen = mCallback == null ? false : mCallback.isFragmentFullScreen(this);
setFullScreen(fullScreen);
}
/**
* Sets full-screen mode for the views.
*/
public void setFullScreen(boolean fullScreen) {
mFullScreen = fullScreen;
}
@Override
public void onCursorChanged(Cursor cursor) {
if (mAdapter == null) {
// The adapter is set in onAttach(), and is guaranteed to be non-null. We have magically
// received an onCursorChanged without attaching to an activity. Ignore this cursor
// change.
return;
}
// FLAG: There is a problem here:
// If the cursor changes, and new items are added at an earlier position than
// the current item, we will switch photos here. Really we should probably
// try to find a photo with the same url and move the cursor to that position.
if (cursor.moveToPosition(mPosition) && !isPhotoBound()) {
mCallback.onCursorChanged(this, cursor);
final LoaderManager manager = getLoaderManager();
final Loader<BitmapResult> fakePhotoLoader = manager.getLoader(
PhotoViewCallbacks.BITMAP_LOADER_PHOTO);
if (fakePhotoLoader != null) {
final PhotoBitmapLoaderInterface loader = (PhotoBitmapLoaderInterface) fakePhotoLoader;
mResolvedPhotoUri = mAdapter.getPhotoUri(cursor);
loader.setPhotoUri(mResolvedPhotoUri);
loader.forceLoad();
}
if (!mThumbnailShown) {
final Loader<BitmapResult> fakeThumbnailLoader = manager.getLoader(
PhotoViewCallbacks.BITMAP_LOADER_THUMBNAIL);
if (fakeThumbnailLoader != null) {
final PhotoBitmapLoaderInterface loader = (PhotoBitmapLoaderInterface) fakeThumbnailLoader;
mThumbnailUri = mAdapter.getThumbnailUri(cursor);
loader.setPhotoUri(mThumbnailUri);
loader.forceLoad();
}
}
}
}
public int getPosition() {
return mPosition;
}
public ProgressBarWrapper getPhotoProgressBar() {
return mPhotoProgressBar;
}
public TextView getEmptyText() {
return mEmptyText;
}
public ImageView getRetryButton() {
return mRetryButton;
}
public boolean isProgressBarNeeded() {
return mProgressBarNeeded;
}
private class InternetStateBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// This is only created if we have the correct permissions, so
ConnectivityManager connectivityManager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
if (activeNetInfo == null || !activeNetInfo.isConnected()) {
mConnected = false;
return;
}
if (mConnected == false && !isPhotoBound()) {
if (mThumbnailShown == false) {
getLoaderManager().restartLoader(PhotoViewCallbacks.BITMAP_LOADER_THUMBNAIL,
null, PhotoViewFragment.this);
}
getLoaderManager().restartLoader(PhotoViewCallbacks.BITMAP_LOADER_PHOTO,
null, PhotoViewFragment.this);
mConnected = true;
mPhotoProgressBar.setVisibility(View.VISIBLE);
}
}
}
}
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