Java tutorial
/** * Copyright (c) 2017 Giovanni Terlingen * <p/> * Permission is hereby granted, free of charge, to any person * obtaining a copy of this software and associated documentation * files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, * copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following * conditions: * <p/> * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * <p/> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. **/ package com.giovanniterlingen.windesheim.view.Adapters; import android.app.Activity; import android.content.DialogInterface; import android.os.Environment; import android.support.design.widget.Snackbar; import android.support.v4.content.res.ResourcesCompat; import android.support.v7.app.AlertDialog; import android.support.v7.widget.PopupMenu; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; import com.giovanniterlingen.windesheim.ApplicationLoader; import com.giovanniterlingen.windesheim.NotificationCenter; import com.giovanniterlingen.windesheim.R; import com.giovanniterlingen.windesheim.models.NatschoolContent; import com.giovanniterlingen.windesheim.view.DownloadsActivity; import java.io.File; import java.util.List; /** * A schedule app for students and teachers of Windesheim * * @author Giovanni Terlingen */ public abstract class NatschoolContentAdapter extends RecyclerView.Adapter<NatschoolContentAdapter.ViewHolder> { private final List<NatschoolContent> content; private final Activity activity; private final int[] icons = { R.drawable.ic_file_blue, R.drawable.ic_file_green, R.drawable.ic_file_red, R.drawable.ic_file_yellow }; protected NatschoolContentAdapter(Activity activity, List<NatschoolContent> content) { this.activity = activity; this.content = content; } protected abstract void onContentClick(NatschoolContent content, int position); @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(activity).inflate(R.layout.adapter_item_content, parent, false); return new ViewHolder(itemView); } @Override public void onBindViewHolder(final ViewHolder holder, final int position) { final TextView contentName = holder.contentName; final ImageView icon = holder.icon; final FrameLayout menuButton = holder.menuButton; final ImageView menuButtonImage = holder.menuButtonImage; contentName.setText(content.get(position).name); holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { onContentClick(content.get(holder.getAdapterPosition()), holder.getAdapterPosition()); } }); if (content.get(position).type == -1) { icon.setImageDrawable(ResourcesCompat.getDrawable(activity.getResources(), getDrawableByName(content.get(position).name), null)); menuButton.setVisibility(View.VISIBLE); menuButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { menuButtonImage.setImageDrawable( ResourcesCompat.getDrawable(activity.getResources(), R.drawable.overflow_open, null)); PopupMenu popupMenu = new PopupMenu(activity, menuButton); popupMenu.inflate(R.menu.menu_file); popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() { public boolean onMenuItemClick(MenuItem item) { if (item.getItemId() == R.id.delete_file) { showPromptDialog(holder.getAdapterPosition()); return true; } return true; } }); popupMenu.setOnDismissListener(new PopupMenu.OnDismissListener() { @Override public void onDismiss(PopupMenu menu) { menuButtonImage.setImageDrawable(ResourcesCompat.getDrawable(activity.getResources(), R.drawable.overflow_normal, null)); } }); popupMenu.show(); } }); } else if (content.get(position).url == null || (content.get(position).url.length() == 0)) { if (content.get(position).imageUrl != null) { icon.setImageDrawable( ResourcesCompat.getDrawable(activity.getResources(), R.drawable.ic_work, null)); } else { icon.setImageDrawable( ResourcesCompat.getDrawable(activity.getResources(), R.drawable.ic_folder, null)); } } else { if (content.get(position).type == 1 || content.get(position).type == 3 || content.get(position).type == 11) { icon.setImageDrawable( ResourcesCompat.getDrawable(activity.getResources(), R.drawable.ic_link, null)); } else if (content.get(position).type == 10) { icon.setImageDrawable(ResourcesCompat.getDrawable(activity.getResources(), getDrawableByName(content.get(position).url), null)); final TextView progressTextView = holder.progressTextView; final ProgressBar progressBar = holder.progressBar; final FrameLayout cancelButton = holder.cancelButton; if (content.get(position).downloading) { contentName.setVisibility(View.GONE); progressTextView.setVisibility(View.VISIBLE); progressBar.setVisibility(View.VISIBLE); if (content.get(position).progress == -1 && content.get(position).progressString == null) { progressTextView.setText(activity.getResources().getString(R.string.downloading)); progressBar.setIndeterminate(true); } else { progressTextView.setText(content.get(position).progressString); progressBar.setIndeterminate(false); progressBar.setMax(100); progressBar.setProgress(content.get(position).progress); } cancelButton.setVisibility(View.VISIBLE); cancelButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { NotificationCenter.getInstance().postNotificationName( NotificationCenter.downloadCancelled, content.get(holder.getAdapterPosition()).id); contentName.setVisibility(View.VISIBLE); progressTextView.setVisibility(View.GONE); progressBar.setVisibility(View.GONE); cancelButton.setVisibility(View.GONE); } }); } else { contentName.setVisibility(View.VISIBLE); progressTextView.setVisibility(View.GONE); progressBar.setVisibility(View.GONE); cancelButton.setVisibility(View.GONE); } } } } private void showPromptDialog(final int position) { new AlertDialog.Builder(activity).setTitle(activity.getResources().getString(R.string.confirmation)) .setMessage(activity.getResources().getString(R.string.delete_file_description)) .setPositiveButton(activity.getResources().getString(R.string.delete), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { File directory = Environment .getExternalStoragePublicDirectory(ApplicationLoader.applicationContext .getResources().getString(R.string.app_name)); File file = new File(directory, content.get(position).name); if (file.exists()) { file.delete(); } content.remove(position); notifyItemRemoved(position); if (content.size() == 0) { ((DownloadsActivity) activity).showEmptyTextview(); } Snackbar snackbar = Snackbar.make(activity.findViewById(R.id.coordinator_layout), activity.getResources().getString(R.string.file_deleted), Snackbar.LENGTH_SHORT); snackbar.show(); dialog.cancel(); } }) .setNegativeButton(activity.getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }) .show(); } private int getDrawableByName(String name) { if (name != null && name.length() != 0) { int color = -1; if (name.contains(".doc") || name.contains(".txt") || name.contains(".psd")) { color = 0; } else if (name.contains(".xls") || name.contains(".csv")) { color = 1; } else if (name.contains(".pdf") || name.contains(".ppt") || name.contains(".key")) { color = 2; } else if (name.contains(".zip") || name.contains(".rar") || name.contains(".ai") || name.contains(".mp3") || name.contains(".mov") || name.contains(".avi")) { color = 3; } if (color == -1) { int idx; String ext = (idx = name.lastIndexOf('.')) == -1 ? "" : name.substring(idx + 1); if (ext.length() != 0) { color = ext.charAt(0) % icons.length; } else { color = name.charAt(0) % icons.length; } } return icons[color]; } return icons[0]; } @Override public int getItemCount() { return content.size(); } public void updateItemStarted(int position, int itemId) { if (content.size() > position && content.get(position).id == itemId) { content.get(position).downloading = true; content.get(position).progress = -1; content.get(position).progressString = null; notifyItemChanged(position); return; } // item was not found on the original location for (int i = 0; i < content.size(); i++) { if (content.get(i).id == itemId) { content.get(i).downloading = true; content.get(i).progress = -1; content.get(i).progressString = null; notifyItemChanged(i); return; } } } public void updateItemProgress(int position, int itemId, int progress, String progressString) { if (content.size() > position && content.get(position).id == itemId) { content.get(position).downloading = true; content.get(position).progress = progress; content.get(position).progressString = progressString; notifyItemChanged(position); return; } // item was not found on the original location for (int i = 0; i < content.size(); i++) { if (content.get(i).id == itemId) { content.get(i).downloading = true; content.get(i).progress = progress; content.get(i).progressString = progressString; notifyItemChanged(i); return; } } } public void updateItemFinished(int position, int itemId) { if (content.size() > position && content.get(position).id == itemId) { content.get(position).downloading = false; notifyItemChanged(position); return; } // item was not found on the original location for (int i = 0; i < content.size(); i++) { if (content.get(i).id == itemId) { content.get(i).downloading = false; notifyItemChanged(i); return; } } } class ViewHolder extends RecyclerView.ViewHolder { final TextView contentName; final ImageView icon; final FrameLayout menuButton; final ImageView menuButtonImage; final TextView progressTextView; final ProgressBar progressBar; final FrameLayout cancelButton; ViewHolder(View view) { super(view); contentName = view.findViewById(R.id.content_name); icon = view.findViewById(R.id.content_icon); menuButton = view.findViewById(R.id.menu_button); menuButtonImage = view.findViewById(R.id.menu_button_image); progressTextView = view.findViewById(R.id.progress_text); progressBar = view.findViewById(R.id.progress_bar); cancelButton = view.findViewById(R.id.cancel_button); } } }