Java tutorial
/* * ServeStream: A HTTP stream browser/player for Android * Copyright 2013 William Seemann * * 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 net.sourceforge.servestream.fragment; import java.util.ArrayList; import java.util.List; import net.sourceforge.servestream.R; import net.sourceforge.servestream.activity.BluetoothOptionsActivity; import net.sourceforge.servestream.adapter.BrowseAdapter; import net.sourceforge.servestream.bean.UriBean; import net.sourceforge.servestream.database.StreamDatabase; import net.sourceforge.servestream.transport.TransportFactory; import net.sourceforge.servestream.utils.DetermineActionTask; import net.sourceforge.servestream.utils.LoadingDialog; import net.sourceforge.servestream.utils.OverflowClickListener; import net.sourceforge.servestream.utils.LoadingDialog.LoadingDialogListener; import net.sourceforge.servestream.utils.MusicUtils; import net.sourceforge.servestream.utils.WebpageParserTask; import android.annotation.SuppressLint; import android.app.AlertDialog; import android.bluetooth.BluetoothAdapter; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; import android.net.Uri; import android.os.AsyncTask; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.support.v4.app.ListFragment; import android.support.v7.widget.PopupMenu; import android.util.SparseArray; import android.view.ContextMenu; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.LayoutInflater; import android.view.MenuItem.OnMenuItemClickListener; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import android.widget.Toast; public class BrowseFragment extends ListFragment implements DetermineActionTask.MusicRetrieverPreparedListener, LoadingDialogListener, OverflowClickListener { private final static String LOADING_DIALOG = "loading_dialog"; public static final int MESSAGE_SHOW_DIRECTORY_CONTENTS = 1; public static final int MESSAGE_PARSE_WEBPAGE = 2; private int mStepsBack; private UriBean[] mDirectory; private WebpageParserTask mWebpageParserTask; private SparseArray<UriBean> mPreviousDirectory = new SparseArray<UriBean>(); private BrowseAdapter mAdapter; private UriBean mSelectedMenuItem; @SuppressLint("HandlerLeak") private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { BrowseFragment.this.handleMessage(msg); } }; @SuppressLint("HandlerLeak") private Handler mQueueHandler = new Handler() { @Override public void handleMessage(Message msg) { MusicUtils.addToCurrentPlaylist(BrowseFragment.this.getActivity(), (long[]) msg.obj); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); setHasOptionsMenu(true); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_browse, container, false); ListView list = (ListView) view.findViewById(android.R.id.list); list.setEmptyView(view.findViewById(android.R.id.empty)); return view; } @Override public void onViewCreated(View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); ListView list = getListView(); list.setFastScrollEnabled(true); list.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { UriBean uri = (UriBean) parent.getItemAtPosition(position); browseTo(uri); } }); registerForContextMenu(list); if (mAdapter == null) { mAdapter = new BrowseAdapter(getActivity(), new ArrayList<UriBean>(), this); } list.setAdapter(mAdapter); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); if (getArguments().getString("target_uri") != null) { Uri uri = Uri.parse(getArguments().getString("target_uri")); browseTo(uri); getArguments().putString("target_uri", null); } } @Override public void onResume() { super.onResume(); if (mWebpageParserTask != null && mWebpageParserTask.getStatus() != AsyncTask.Status.FINISHED) { showDialog(LOADING_DIALOG); } } @Override public void onPause() { super.onPause(); dismissDialog(LOADING_DIALOG); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { // create menu to handle stream URLs // create menu to handle deleting and sharing lists final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; final UriBean uri = (UriBean) getListView().getAdapter().getItem(info.position); try { final String streamURL = uri.getUri().toString(); // set the menu title to the name attribute of the URL link menu.setHeaderTitle(uri.getNickname()); // save the URL android.view.MenuItem save = menu.add(R.string.save_label); save.setOnMenuItemClickListener(new OnMenuItemClickListener() { public boolean onMenuItemClick(android.view.MenuItem arg0) { // prompt user to make sure they really want this new AlertDialog.Builder(BrowseFragment.this.getActivity()) .setMessage(getString(R.string.url_save_confirmation_msg, streamURL)) .setPositiveButton(R.string.confirm_label, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { saveUri(uri); BrowseFragment.this.getActivity() .sendBroadcast(new Intent(UrlListFragment.UPDATE_LIST)); } }).setNegativeButton(android.R.string.cancel, null).create().show(); return true; } }); // view the URL android.view.MenuItem view = menu.add(R.string.view_url_label); view.setOnMenuItemClickListener(new OnMenuItemClickListener() { public boolean onMenuItemClick(android.view.MenuItem arg0) { // display the URL new AlertDialog.Builder(BrowseFragment.this.getActivity()).setMessage(streamURL) .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { return; } }).create().show(); return true; } }); } catch (Exception ex) { ex.printStackTrace(); } // add to playlist android.view.MenuItem add = menu.add(R.string.add_to_playlist_label); add.setOnMenuItemClickListener(new OnMenuItemClickListener() { public boolean onMenuItemClick(android.view.MenuItem item) { MusicUtils.addToCurrentPlaylistFromURL(BrowseFragment.this.getActivity(), uri, mQueueHandler); return true; } }); // share the URL android.view.MenuItem share = menu.add(R.string.share_label); share.setOnMenuItemClickListener(new OnMenuItemClickListener() { public boolean onMenuItemClick(android.view.MenuItem item) { String url = uri.getUri().toString(); String appName = getString(R.string.app_name); Intent intent = new Intent(Intent.ACTION_SEND); intent.setType("text/plain"); intent.putExtra(Intent.EXTRA_TEXT, getString(R.string.share_signature, url, appName)); startActivity(Intent.createChooser(intent, getString(R.string.share_label))); return true; } }); } private void browseTo(Uri uri) { mStepsBack = 0; mDirectory = new UriBean[1000]; mDirectory[mStepsBack] = TransportFactory.getTransport(uri.getScheme()).createUri(uri); refreshList(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.browse, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case (R.id.menu_item_refresh): refreshList(); return true; case (R.id.menu_search): getActivity().onSearchRequested(); default: return super.onOptionsItemSelected(item); } } @SuppressWarnings("unchecked") private void handleMessage(Message message) { switch (message.what) { case MESSAGE_SHOW_DIRECTORY_CONTENTS: showDirectoryContents((List<UriBean>) message.obj); break; case MESSAGE_PARSE_WEBPAGE: mPreviousDirectory.put(mStepsBack, (UriBean) message.obj); mStepsBack++; mPreviousDirectory.put(mStepsBack, null); mDirectory[mStepsBack] = (UriBean) message.obj; refreshList(); break; } } private void showDirectoryContents(List<UriBean> contents) { mAdapter.clear(); for (int i = 0; i < contents.size(); i++) { mAdapter.add(contents.get(i)); } mAdapter.notifyDataSetChanged(); selectInList(mPreviousDirectory.get(mStepsBack)); dismissDialog(LOADING_DIALOG); } /** * This function browses up one level * according to the field: currentDirectory */ private void upOneLevel() { if (mStepsBack > 0) { mStepsBack--; refreshList(); } } @SuppressLint("NewApi") private void browseTo(UriBean uri) { showDialog(LOADING_DIALOG); DetermineActionTask determineActionTask = new DetermineActionTask(getActivity(), uri, this); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { determineActionTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); } else { determineActionTask.execute(); } } @SuppressLint("NewApi") private void refreshList() { if (mDirectory == null) { return; } showDialog(LOADING_DIALOG); mWebpageParserTask = new WebpageParserTask(mHandler, mDirectory[mStepsBack]); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { mWebpageParserTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR); } else { mWebpageParserTask.execute(); } } private void selectInList(UriBean uri) { if (uri == null) { return; } for (int i = 0; i < mAdapter.getCount(); i++) { UriBean it = (UriBean) mAdapter.getItem(i); if (it.equals(uri)) { getListView().setSelection(i); break; } } } public void onBackKeyPressed() { if (mStepsBack > 0) { upOneLevel(); } else { getActivity().finish(); } } public ArrayList<UriBean> getUris() { ArrayList<UriBean> uris = new ArrayList<UriBean>(); for (int i = 0; i < mAdapter.getItems().size(); i++) { uris.add(mAdapter.getItem(i)); } return uris; } /** * Adds a stream URL to the stream database if it doesn't exist * * @param targetStream The stream URL to add to the database */ private void saveUri(UriBean targetUri) { if (targetUri != null) { StreamDatabase db = new StreamDatabase(this.getActivity()); db.saveUri(targetUri); db.close(); } } private void showUrlNotOpenedToast() { Toast.makeText(this.getActivity(), R.string.url_not_opened_message, Toast.LENGTH_SHORT).show(); } @Override public void onMusicRetrieverPrepared(String action, UriBean uri, long[] list) { if (action.equals(DetermineActionTask.URL_ACTION_UNDETERMINED)) { dismissDialog(LOADING_DIALOG); showUrlNotOpenedToast(); } else if (action.equals(DetermineActionTask.URL_ACTION_BROWSE)) { mPreviousDirectory.put(mStepsBack, uri); mStepsBack++; mPreviousDirectory.put(mStepsBack, null); mDirectory[mStepsBack] = uri; refreshList(); } else if (action.equals(DetermineActionTask.URL_ACTION_PLAY)) { dismissDialog(LOADING_DIALOG); MusicUtils.playAll(BrowseFragment.this.getActivity(), list, 0); } } private void showDialog(String tag) { // DialogFragment.show() will take care of adding the fragment // in a transaction. We also want to remove any currently showing // dialog, so make our own transaction and take care of that here. FragmentTransaction ft = getChildFragmentManager().beginTransaction(); Fragment prev = getChildFragmentManager().findFragmentByTag(tag); if (prev != null) { ft.remove(prev); } DialogFragment newFragment = null; // Create and show the dialog. if (tag.equals(LOADING_DIALOG)) { newFragment = LoadingDialog.newInstance(this, getString(R.string.opening_url_message)); } ft.add(0, newFragment, tag); ft.commit(); } private void dismissDialog(String tag) { FragmentTransaction ft = getChildFragmentManager().beginTransaction(); DialogFragment prev = (DialogFragment) getChildFragmentManager().findFragmentByTag(tag); if (prev != null) { prev.dismiss(); ft.remove(prev); ft.commit(); } } @Override public void onLoadingDialogCancelled(DialogFragment dialog) { if (mWebpageParserTask != null && mWebpageParserTask.getStatus() != AsyncTask.Status.FINISHED) { mWebpageParserTask.cancel(false); } } private void showPopup(View v, UriBean uri) { mSelectedMenuItem = uri; PopupMenu popup = new PopupMenu(getActivity(), v); Menu menu = popup.getMenu(); MenuInflater inflater = popup.getMenuInflater(); inflater.inflate(R.menu.browse_uri_actions, menu); BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); if (bluetoothAdapter == null) { menu.removeItem(R.id.menu_autostart_on_bluetooth); } popup.setOnMenuItemClickListener(mPopupMenuOnMenuItemClickListener); popup.show(); } private PopupMenu.OnMenuItemClickListener mPopupMenuOnMenuItemClickListener = new PopupMenu.OnMenuItemClickListener() { @Override public boolean onMenuItemClick(MenuItem item) { Intent intent; switch (item.getItemId()) { case R.id.menu_item_save: saveUri(mSelectedMenuItem); BrowseFragment.this.getActivity().sendBroadcast(new Intent(UrlListFragment.UPDATE_LIST)); return true; case R.id.menu_item_view_url: final String streamURL = mSelectedMenuItem.getUri().toString(); new AlertDialog.Builder(BrowseFragment.this.getActivity()).setMessage(streamURL) .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { return; } }).create().show(); return true; case R.id.menu_item_add_to_playlist_label: MusicUtils.addToCurrentPlaylistFromURL(getActivity(), mSelectedMenuItem, mQueueHandler); return true; case R.id.menu_item_share: String url = mSelectedMenuItem.getUri().toString(); String appName = getString(R.string.app_name); intent = new Intent(Intent.ACTION_SEND); intent.setType("text/plain"); intent.putExtra(Intent.EXTRA_TEXT, getString(R.string.share_signature, url, appName)); startActivity(Intent.createChooser(intent, getString(R.string.share_label))); return true; case R.id.menu_autostart_on_bluetooth: SharedPreferences prefs = getActivity().getSharedPreferences(BluetoothOptionsActivity.PREFS_NAME, Context.MODE_PRIVATE); Editor editor = prefs.edit(); editor.putString(BluetoothOptionsActivity.PREF_AUTOSTART_STREAM, mSelectedMenuItem.getUri().toString()); editor.commit(); return true; default: return false; } } }; @Override public void onClick(View view, UriBean uri) { showPopup(view, uri); } }