Java tutorial
/* * Copyright 2012 Google Inc. * * 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 br.com.bioscada.apps.biotracks.fragments; import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.content.Intent; import android.content.pm.ActivityInfo; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.graphics.drawable.Drawable; import android.support.v4.app.FragmentActivity; import android.support.v4.app.ShareCompat; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.TextView; import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.List; import br.com.bioscada.apps.biotracks.R; import br.com.bioscada.apps.biotracks.util.IntentUtils; /** * A DialogFragment to choose an activity. * * @author Jimmy Shih */ public class ChooseActivityDialogFragment extends AbstractMyTracksDialogFragment { /** * Interface for caller of this dialog fragment. * * @author Jimmy Shih */ public interface ChooseActivityCaller { /** * Called when choose activity is done. */ public void onChooseActivityDone(String packageName, String className); } private static class ViewHolder { TextView text1; TextView text2; ImageView icon; } public static final String CHOOSE_ACTIVITY_DIALOG_TAG = "chooseActivityDialog"; private ChooseActivityCaller caller; private PackageManager packageManager; @Override public void onAttach(Activity activity) { super.onAttach(activity); try { caller = (ChooseActivityCaller) activity; } catch (ClassCastException e) { throw new ClassCastException( activity.toString() + " must implement " + ChooseActivityCaller.class.getSimpleName()); } } @Override protected Dialog createDialog() { FragmentActivity fragmentActivity = getActivity(); packageManager = fragmentActivity.getPackageManager(); List<DisplayInfo> displayInfos = getDisplayInfos(fragmentActivity); ArrayAdapter<DisplayInfo> arrayAdapter = new ArrayAdapter<DisplayInfo>(fragmentActivity, R.layout.choose_activity_list_item, R.id.choose_activity_list_item_text1, displayInfos) { @Override public View getView(int position, View convertView, ViewGroup parent) { View view; ViewHolder viewHolder; if (convertView == null) { view = getActivity().getLayoutInflater().inflate(R.layout.choose_activity_list_item, parent, false); viewHolder = new ViewHolder(); viewHolder.text1 = (TextView) view.findViewById(R.id.choose_activity_list_item_text1); viewHolder.text2 = (TextView) view.findViewById(R.id.choose_activity_list_item_text2); viewHolder.icon = (ImageView) view.findViewById(R.id.choose_activity_list_item_icon); view.setTag(viewHolder); } else { view = convertView; viewHolder = (ViewHolder) view.getTag(); } DisplayInfo displayInfo = getItem(position); viewHolder.text1.setText(displayInfo.primaryLabel); boolean hasSecondaryLabel = displayInfo.secondaryLabel != null; viewHolder.text2.setVisibility(hasSecondaryLabel ? View.VISIBLE : View.GONE); if (hasSecondaryLabel) { viewHolder.text2.setText(displayInfo.secondaryLabel); } viewHolder.icon.setImageDrawable(displayInfo.icon); return view; } }; return new AlertDialog.Builder(fragmentActivity) .setSingleChoiceItems(arrayAdapter, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { AlertDialog alertDialog = (AlertDialog) dialog; DisplayInfo displayInfo = (DisplayInfo) alertDialog.getListView().getItemAtPosition(which); ActivityInfo activityInfo = displayInfo.resolveInfo.activityInfo; dismiss(); caller.onChooseActivityDone(activityInfo.applicationInfo.packageName, activityInfo.name); } }).setTitle(R.string.share_track_share_url_title).create(); } @Override public void onCancel(DialogInterface dialog) { super.onCancel(dialog); caller.onChooseActivityDone(null, null); } /** * Gets the display info. */ private List<DisplayInfo> getDisplayInfos(FragmentActivity fragmentActivity) { List<DisplayInfo> displayInfos = new ArrayList<DisplayInfo>(); Intent intent = ShareCompat.IntentBuilder.from(fragmentActivity).setType(IntentUtils.TEXT_PLAIN_TYPE) .getIntent(); List<ResolveInfo> resolveInfos = packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY); if (resolveInfos != null && resolveInfos.size() > 0) { int size = resolveInfos.size(); ResolveInfo firstResolveInfo = resolveInfos.get(0); for (int i = 1; i < size; i++) { ResolveInfo resolveInfo = resolveInfos.get(i); if (firstResolveInfo.priority != resolveInfo.priority || firstResolveInfo.isDefault != resolveInfo.isDefault) { while (i < size) { resolveInfos.remove(i); size--; } } } if (size > 1) { ResolveInfo.DisplayNameComparator displayNameComparator = new ResolveInfo.DisplayNameComparator( packageManager); Collections.sort(resolveInfos, displayNameComparator); } firstResolveInfo = resolveInfos.get(0); int start = 0; CharSequence firstLabel = firstResolveInfo.loadLabel(packageManager); for (int i = 1; i < size; i++) { if (firstLabel == null) { firstLabel = firstResolveInfo.activityInfo.packageName; } ResolveInfo resolveInfo = resolveInfos.get(i); CharSequence label = resolveInfo.loadLabel(packageManager); if (label == null) { label = resolveInfo.activityInfo.packageName; } if (label.equals(firstLabel)) { continue; } processGroup(resolveInfos, displayInfos, start, i - 1); firstResolveInfo = resolveInfo; firstLabel = label; start = i; } // Process last group processGroup(resolveInfos, displayInfos, start, size - 1); } return displayInfos; } /** * Contains display info. * * @author Jimmy Shih */ private final class DisplayInfo { private ResolveInfo resolveInfo; private CharSequence primaryLabel; private CharSequence secondaryLabel; private Drawable icon; public DisplayInfo(ResolveInfo resolveInfo, CharSequence primaryLabel, CharSequence secondaryLabel, Drawable icon) { this.resolveInfo = resolveInfo; this.primaryLabel = primaryLabel; this.secondaryLabel = secondaryLabel; this.icon = icon; } } /** * Processes a group of items with the same label. * * @param resolveInfos list of resolve infos * @param displayInfos list of display infos * @param start start index * @param end end index */ private void processGroup(List<ResolveInfo> resolveInfos, List<DisplayInfo> displayInfos, int start, int end) { ResolveInfo startResolveInfo = resolveInfos.get(start); CharSequence primaryLabel = startResolveInfo.loadLabel(packageManager); Drawable icon = startResolveInfo.loadIcon(packageManager); int num = end - start + 1; if (num == 1) { // Only one, set the secondary label to null displayInfos.add(new DisplayInfo(startResolveInfo, primaryLabel, null, icon)); } else { // Decide package name or application name for the secondary label boolean usePackageName = false; CharSequence appName = startResolveInfo.activityInfo.applicationInfo.loadLabel(packageManager); if (appName == null) { usePackageName = true; } else { // Use HashSet to track duplicates HashSet<CharSequence> duplicates = new HashSet<CharSequence>(); duplicates.add(appName); for (int i = start + 1; i <= end; i++) { ResolveInfo resolveInfo = resolveInfos.get(i); CharSequence name = resolveInfo.activityInfo.applicationInfo.loadLabel(packageManager); if ((name == null) || (duplicates.contains(name))) { usePackageName = true; break; } else { duplicates.add(name); } } // Clear HashSet for later use duplicates.clear(); } for (int i = start; i <= end; i++) { ResolveInfo resolveInfo = resolveInfos.get(i); CharSequence secondaryLabel = usePackageName ? resolveInfo.activityInfo.packageName : resolveInfo.activityInfo.applicationInfo.loadLabel(packageManager); displayInfos.add(new DisplayInfo(resolveInfo, primaryLabel, secondaryLabel, icon)); } } } }