Java tutorial
/* * ArtistryMuse is an application that allows artist to share projects * they have created along with the inspirations behind them for others to * discover and enjoy. * Copyright (C) 2017 David A. Todd * * 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 com.concavenp.artistrymuse.fragments; import android.content.Context; import android.content.SharedPreferences; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.content.res.ResourcesCompat; import android.support.v4.graphics.drawable.RoundedBitmapDrawable; import android.support.v4.graphics.drawable.RoundedBitmapDrawableFactory; import android.util.Log; import android.widget.ImageView; import android.widget.TextView; import com.bumptech.glide.Glide; import com.bumptech.glide.load.engine.DiskCacheStrategy; import com.bumptech.glide.request.target.BitmapImageViewTarget; import com.concavenp.artistrymuse.R; import com.concavenp.artistrymuse.StorageDataType; import com.concavenp.artistrymuse.interfaces.OnInteractionListener; import com.firebase.ui.storage.images.FirebaseImageLoader; import com.google.firebase.database.DatabaseReference; import com.google.firebase.database.FirebaseDatabase; import com.google.firebase.storage.FirebaseStorage; import com.google.firebase.storage.StorageReference; import static android.content.Context.MODE_PRIVATE; /** * Created by dave on 3/25/2017. * * */ public abstract class BaseFragment extends Fragment implements SharedPreferences.OnSharedPreferenceChangeListener { /** * The logging tag string to be associated with log data for this class */ @SuppressWarnings("unused") private static final String TAG = BaseFragment.class.getSimpleName(); protected OnInteractionListener mInteractionListener; protected DatabaseReference mDatabase; protected StorageReference mStorageRef; protected FirebaseImageLoader mImageLoader; protected SharedPreferences mSharedPreferences; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Initialize the Firebase Database connection mDatabase = FirebaseDatabase.getInstance().getReference(); // Initialize the Firebase Storage connection mStorageRef = FirebaseStorage.getInstance().getReference(); // Create the Firebase image loader mImageLoader = new FirebaseImageLoader(); // Get ready to read from local storage for this app loadSharedPreferences(getContext()); } public void refresh() { // Do nothing } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { // Just for the UID changes if (key.equals(getResources().getString(R.string.application_uid_key))) { // All of the overriding subclasses will be informed to refresh their data refresh(); } } @Override public void onAttach(Context context) { super.onAttach(context); // Re-attach to the parent Activity interface if (context instanceof OnInteractionListener) { mInteractionListener = (OnInteractionListener) context; } else { throw new RuntimeException(context.toString() + " must implement OnInteractionListener"); } // Register as a listener to SharedPreference ArtistryMuseUID changes loadSharedPreferences(context); mSharedPreferences.registerOnSharedPreferenceChangeListener(this); } @Override public void onDetach() { super.onDetach(); // Detach from the parent Activity interface(s) mInteractionListener = null; // Unregister as a listener to SharedPreference ArtistryMuseUID changes mSharedPreferences.unregisterOnSharedPreferenceChangeListener(this); } protected String getUid() { // Get the UID from the SharedPreferences return mSharedPreferences.getString(getResources().getString(R.string.application_uid_key), getResources().getString(R.string.default_application_uid_value)); } protected String buildFileReference(String uid, String imageUid, StorageDataType type) { String fileReference = null; // Verify there is image data to work with if ((imageUid != null) && (!imageUid.isEmpty())) { // Verify there is user data to work with if ((uid != null) && (!uid.isEmpty())) { fileReference = type.getType() + getResources().getString(R.string.firebase_separator) + uid + getResources().getString(R.string.firebase_separator) + imageUid + getResources().getString(R.string.firebase_image_type); } else { Log.e(TAG, "Unexpected null project UID"); } } else { Log.e(TAG, "Unexpected null image UID"); } return fileReference; } protected StorageReference buildStorageReference(String uid, String imageUid, StorageDataType type) { StorageReference result = null; String fileReference = buildFileReference(uid, imageUid, type); // It is possible for the file reference string to be null, so check for it if ((fileReference != null) && (!fileReference.isEmpty())) { result = mStorageRef.child(fileReference); } return result; } protected void populateImageView(String fileReference, ImageView imageView) { // For safety, check as well (I've seen it) ... if (imageView != null) { // It is possible for the file reference string to be null, so check for it if ((fileReference != null) && (!fileReference.isEmpty())) { StorageReference storageReference = mStorageRef.child(fileReference); // Download directly from StorageReference using Glide Glide.with(getContext()).using(mImageLoader).load(storageReference).fitCenter() .diskCacheStrategy(DiskCacheStrategy.ALL).into(imageView); } } } protected void populateCircularImageView(StorageReference storageReference, final ImageView imageView) { // For safety, check as well (I've seen it) ... if (imageView != null) { // It is possible for the file reference string to be null, so check for it if (storageReference != null) { // Download directly from StorageReference using Glide Glide.with(this).using(mImageLoader).load(storageReference).asBitmap().centerCrop() .diskCacheStrategy(DiskCacheStrategy.ALL).into(createBitmapImageViewTarget(imageView)); } } } protected void populateTextView(String text, TextView textView) { // For safety, check as well (I've seen it) ... if (textView != null) { // Verify there is text to work with and empty out if nothing is there. if ((text != null) && (!text.isEmpty())) { textView.setText(text); } else { textView.setText(""); } } } /** * A lazy loader of the SharedPreferences. * * @param context - The context for which to aquire the SharedPreferences */ private void loadSharedPreferences(Context context) { // Check to see if this has been done before if (mSharedPreferences == null) { mSharedPreferences = context.getSharedPreferences( getResources().getString(R.string.shared_preferences_filename), MODE_PRIVATE); } } private BitmapImageViewTarget createBitmapImageViewTarget(final ImageView imageView) { return new BitmapImageViewTarget(imageView) { @Override protected void setResource(Bitmap bitmap) { int bitmapWidth = bitmap.getWidth(); int bitmapHeight = bitmap.getHeight(); int borderWidthHalf = 5; int bitmapSquareWidth = Math.min(bitmapWidth, bitmapHeight); int newBitmapSquare = bitmapSquareWidth + borderWidthHalf; Bitmap roundedBitmap = Bitmap.createBitmap(newBitmapSquare, newBitmapSquare, Bitmap.Config.ARGB_8888); // Initialize a new Canvas to draw empty bitmap Canvas canvas = new Canvas(roundedBitmap); // Calculation to draw bitmap at the circular bitmap center position int x = borderWidthHalf + bitmapSquareWidth - bitmapWidth; int y = borderWidthHalf + bitmapSquareWidth - bitmapHeight; canvas.drawBitmap(bitmap, x, y, null); // Initializing a new Paint instance to draw circular border Paint borderPaint = new Paint(); borderPaint.setStyle(Paint.Style.STROKE); borderPaint.setStrokeWidth(borderWidthHalf * 2); borderPaint.setColor(ResourcesCompat.getColor(getResources(), R.color.myApp_accent_700, null)); canvas.drawCircle(canvas.getWidth() / 2, canvas.getWidth() / 2, newBitmapSquare / 2, borderPaint); RoundedBitmapDrawable circularBitmapDrawable = RoundedBitmapDrawableFactory.create(getResources(), roundedBitmap); circularBitmapDrawable.setCircular(true); imageView.setImageDrawable(circularBitmapDrawable); } }; } }