Java tutorial
/* * Copyright (c) 2017 Washington State Department of Transportation * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> * */ package gov.wa.wsdot.android.wsdot.ui.camera; import android.annotation.SuppressLint; import android.arch.lifecycle.ViewModelProvider; import android.arch.lifecycle.ViewModelProviders; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.net.Uri; import android.os.Bundle; import android.provider.MediaStore; import android.support.design.widget.Snackbar; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.AsyncTaskLoader; import android.support.v4.content.Loader; import android.support.v4.view.MenuItemCompat; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.ShareActionProvider; import android.util.Log; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL; import javax.inject.Inject; import gov.wa.wsdot.android.wsdot.R; import gov.wa.wsdot.android.wsdot.di.Injectable; public class CameraImageFragment extends Fragment implements LoaderCallbacks<Drawable>, SwipeRefreshLayout.OnRefreshListener, Injectable { private static final String TAG = CameraImageFragment.class.getSimpleName(); private String mUrl; private ImageView mImage; private String mTitle; private int mId; private boolean showStar = true; private String mCameraName; private ShareActionProvider shareAction; private boolean mIsStarred = false; private SwipeRefreshLayout mSwipeRefreshLayout; static final private int MENU_ITEM_STAR = Menu.FIRST; CameraViewModel viewModel; @Inject ViewModelProvider.Factory viewModelFactory; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); Bundle args = getArguments(); showStar = args.getBoolean("show_star", true); mId = args.getInt("id"); mCameraName = "cameraImage" + mId + ".jpg"; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { ViewGroup mRootView = (ViewGroup) inflater.inflate(R.layout.camera_dialog, null); // For some reason, if we omit this, NoSaveStateFrameLayout thinks we are // FILL_PARENT / WRAP_CONTENT, making the progress bar stick to the top of the activity. mRootView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); mSwipeRefreshLayout = mRootView.findViewById(R.id.swipe_container); mSwipeRefreshLayout.setOnRefreshListener(this); mSwipeRefreshLayout.setColorSchemeResources(R.color.holo_blue_bright, R.color.holo_green_light, R.color.holo_orange_light, R.color.holo_red_light); mImage = mRootView.findViewById(R.id.image); viewModel = ViewModelProviders.of(this, viewModelFactory).get(CameraViewModel.class); viewModel.getResourceStatus().observe(this, resourceStatus -> { if (resourceStatus != null) { switch (resourceStatus.status) { case LOADING: mSwipeRefreshLayout.setRefreshing(true); break; case SUCCESS: mSwipeRefreshLayout.setRefreshing(false); break; case ERROR: mSwipeRefreshLayout.setRefreshing(false); Toast.makeText(this.getContext(), "connection error", Toast.LENGTH_LONG).show(); } } }); viewModel.getCamera(mId).observe(this, camera -> { if (camera != null) { mTitle = camera.getTitle(); mUrl = camera.getUrl(); mIsStarred = camera.getIsStarred() != 0; getLoaderManager().initLoader(0, null, this); if (camera.getMilepost() != null) { ((TextView) mRootView.findViewById(R.id.milepost)) .setText(String.format("milepost %s", camera.getMilepost())); } if (!camera.getDirection().equals("null")) { String directionString; switch (camera.getDirection()) { case "N": directionString = "This camera faces north"; break; case "S": directionString = "This camera faces south"; break; case "E": directionString = "This camera faces east"; break; case "W": directionString = "This camera faces west"; break; default: directionString = "This camera could be pointing in a number of directions for operational reasons."; break; } mRootView.findViewById(R.id.direction).setVisibility(View.VISIBLE); ((TextView) mRootView.findViewById(R.id.direction)).setText(directionString); } else { mRootView.findViewById(R.id.direction).setVisibility(View.GONE); } } }); return mRootView; } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.share_action_provider, menu); // Set file with share history to the provider and set the share intent. MenuItem menuItem_Share = menu.findItem(R.id.action_share); shareAction = (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem_Share); shareAction.setShareHistoryFileName(ShareActionProvider.DEFAULT_SHARE_HISTORY_FILE_NAME); if (showStar) { MenuItem menuItem_Star = menu.add(0, MENU_ITEM_STAR, menu.size(), R.string.description_star); MenuItemCompat.setShowAsAction(menuItem_Star, MenuItemCompat.SHOW_AS_ACTION_IF_ROOM); if (mIsStarred) { menu.getItem(MENU_ITEM_STAR).setIcon(R.drawable.ic_menu_star_on); } else { menu.getItem(MENU_ITEM_STAR).setIcon(R.drawable.ic_menu_star); } } } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case MENU_ITEM_STAR: toggleStar(item); return true; } return super.onOptionsItemSelected(item); } private void toggleStar(MenuItem item) { Snackbar added_snackbar = Snackbar.make(getView(), R.string.add_favorite, Snackbar.LENGTH_SHORT); Snackbar removed_snackbar = Snackbar.make(getView(), R.string.remove_favorite, Snackbar.LENGTH_SHORT); if (mIsStarred) { item.setIcon(R.drawable.ic_menu_star); item.setTitle("Favorite checkbox, not checked"); viewModel.setIsStarredFor(mId, 0); removed_snackbar.show(); mIsStarred = false; } else { item.setIcon(R.drawable.ic_menu_star_on); item.setTitle("Favorite checkbox, checked"); viewModel.setIsStarredFor(mId, 1); added_snackbar.show(); mIsStarred = true; } } private Intent createShareIntent() { File f = new File(getActivity().getFilesDir(), mCameraName); ContentValues values = new ContentValues(2); values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg"); values.put(MediaStore.Images.Media.DATA, f.getAbsolutePath()); Uri uri = getActivity().getContentResolver().insert(MediaStore.Images.Media.INTERNAL_CONTENT_URI, values); Intent shareIntent = new Intent(Intent.ACTION_SEND); shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET); shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); shareIntent.setType("image/jpeg"); shareIntent.putExtra(Intent.EXTRA_TEXT, mTitle); shareIntent.putExtra(Intent.EXTRA_SUBJECT, mTitle); shareIntent.putExtra(Intent.EXTRA_STREAM, uri); return shareIntent; } public Loader<Drawable> onCreateLoader(int id, Bundle args) { mSwipeRefreshLayout.setRefreshing(true); return new CameraImageLoader(getActivity(), mCameraName, mUrl); } public void onLoadFinished(Loader<Drawable> loader, Drawable data) { mSwipeRefreshLayout.setRefreshing(false); mImage.setImageDrawable(data); try { //shareAction.setShareIntent(createShareIntent()); } catch (NullPointerException e) { Log.e(TAG, "createShareIntent() returned NULL: " + e.getStackTrace()); } } public void onLoaderReset(Loader<Drawable> loader) { mSwipeRefreshLayout.setRefreshing(false); } public static class CameraImageLoader extends AsyncTaskLoader<Drawable> { String cameraName; String url; public CameraImageLoader(Context context, String cameraName, String url) { super(context); this.cameraName = cameraName; this.url = url; } @SuppressLint("WorldReadableFiles") @SuppressWarnings("deprecation") @Override public Drawable loadInBackground() { FileOutputStream fos = null; Bitmap image = null; try { HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection(); connection.setRequestProperty("User-agent", "Mozilla/4.0"); connection.connect(); InputStream input = connection.getInputStream(); image = BitmapFactory.decodeStream(input); if (image == null) { image = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.camera_offline); } fos = getContext().openFileOutput(cameraName, Context.MODE_PRIVATE); image.compress(Bitmap.CompressFormat.JPEG, 75, fos); fos.flush(); fos.close(); } catch (Exception e) { Log.e("CameraImageFragment", "Error retrieving camera image", e); } finally { if (image == null) { image = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.camera_offline); } } return new BitmapDrawable(image); } @Override public void deliverResult(Drawable data) { super.deliverResult(data); } @Override protected void onStartLoading() { super.onStartLoading(); forceLoad(); } @Override protected void onStopLoading() { super.onStopLoading(); // Attempt to cancel the current load task if possible. cancelLoad(); } @Override public void onCanceled(Drawable data) { super.onCanceled(data); } @Override protected void onReset() { super.onReset(); // Ensure the loader is stopped onStopLoading(); } } public void onRefresh() { getLoaderManager().restartLoader(0, null, this); } }