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 com.google.android.apps.mytracks.fragments; import com.google.android.apps.mytracks.io.sendtogoogle.SendRequest; import com.google.android.apps.mytracks.util.IntentUtils; import com.nogago.android.tracks.ConfirmSharingActivity; import com.nogago.android.tracks.R; 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.os.Bundle; import android.support.v4.app.DialogFragment; 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; /** * A DialogFragment to choose an activity. * * @author Jimmy Shih */ public class ChooseActivityDialogFragment extends DialogFragment { public static final String CHOOSE_ACTIVITY_DIALOG_TAG = "chooseActivityDialog"; private static final String KEY_TRACK_ID = "trackId"; private static final String KEY_TRACK_URL = "trackUrl"; private PackageManager packageManager; public static ChooseActivityDialogFragment newInstance(long trackId, String trackUrl) { Bundle bundle = new Bundle(); bundle.putLong(KEY_TRACK_ID, trackId); bundle.putString(KEY_TRACK_URL, trackUrl); ChooseActivityDialogFragment chooseActivityDialogFragment = new ChooseActivityDialogFragment(); chooseActivityDialogFragment.setArguments(bundle); return chooseActivityDialogFragment; } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { packageManager = getActivity().getPackageManager(); List<DisplayInfo> displayInfos = getDisplayInfos(); ArrayAdapter<DisplayInfo> arrayAdapter = new ArrayAdapter<DisplayInfo>(getActivity(), 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; if (convertView == null) { view = getActivity().getLayoutInflater().inflate(R.layout.choose_activity_list_item, parent, false); } else { view = convertView; } DisplayInfo displayInfo = getItem(position); TextView text1 = (TextView) view.findViewById(R.id.choose_activity_list_item_text1); TextView text2 = (TextView) view.findViewById(R.id.choose_activity_list_item_text2); ImageView icon = (ImageView) view.findViewById(R.id.choose_activity_list_item_icon); text1.setText(displayInfo.primaryLabel); if (displayInfo.secondaryLabel != null) { text2.setVisibility(View.VISIBLE); text2.setText(displayInfo.secondaryLabel); } else { text2.setVisibility(View.GONE); } icon.setImageDrawable(displayInfo.icon); return view; } }; return new AlertDialog.Builder(getActivity()) .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; String packageName = activityInfo.applicationInfo.packageName; String className = activityInfo.name; long trackId = getArguments().getLong(KEY_TRACK_ID); String trackUrl = getArguments().getString(KEY_TRACK_URL); if (trackUrl == null) { SendRequest sendRequest = new SendRequest(trackId); sendRequest.setSendMaps(true); sendRequest.setNewMap(true); sendRequest.setSharingAppPackageName(packageName); sendRequest.setSharingAppClassName(className); Intent intent = IntentUtils.newIntent(getActivity(), ConfirmSharingActivity.class) .putExtra(SendRequest.SEND_REQUEST_KEY, sendRequest); startActivity(intent); dismiss(); } else { Intent intent = IntentUtils.newShareUrlIntent(getActivity(), trackId, trackUrl, packageName, className); startActivity(intent); getActivity().finish(); } } }).setTitle(R.string.share_track_picker_title).create(); } /** * Gets the display info. */ private List<DisplayInfo> getDisplayInfos() { List<DisplayInfo> displayInfos = new ArrayList<DisplayInfo>(); Intent intent = ShareCompat.IntentBuilder.from(getActivity()).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)); } } } }