/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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 android.app;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ComponentInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.PaintDrawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Displays a list of all activities which can be performed
* for a given intent. Launches when clicked.
*
*/
public abstract class LauncherActivity extends ListActivity {
Intent mIntent;
PackageManager mPackageManager;
IconResizer mIconResizer;
/**
* An item in the list
*/
public static class ListItem {
public ResolveInfo resolveInfo;
public CharSequence label;
public Drawable icon;
public String packageName;
public String className;
public Bundle extras;
ListItem(PackageManager pm, ResolveInfo resolveInfo, IconResizer resizer) {
this.resolveInfo = resolveInfo;
label = resolveInfo.loadLabel(pm);
ComponentInfo ci = resolveInfo.activityInfo;
if (ci == null) ci = resolveInfo.serviceInfo;
if (label == null && ci != null) {
label = resolveInfo.activityInfo.name;
}
if (resizer != null) {
icon = resizer.createIconThumbnail(resolveInfo.loadIcon(pm));
}
packageName = ci.applicationInfo.packageName;
className = ci.name;
}
public ListItem() {
}
}
/**
* Adapter which shows the set of activities that can be performed for a given intent.
*/
private class ActivityAdapter extends BaseAdapter implements Filterable {
private final Object lock = new Object();
private ArrayList<ListItem> mOriginalValues;
protected final IconResizer mIconResizer;
protected final LayoutInflater mInflater;
protected List<ListItem> mActivitiesList;
private Filter mFilter;
public ActivityAdapter(IconResizer resizer) {
mIconResizer = resizer;
mInflater = (LayoutInflater) LauncherActivity.this.getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
mActivitiesList = makeListItems();
}
public Intent intentForPosition(int position) {
if (mActivitiesList == null) {
return null;
}
Intent intent = new Intent(mIntent);
ListItem item = mActivitiesList.get(position);
intent.setClassName(item.packageName, item.className);
if (item.extras != null) {
intent.putExtras(item.extras);
}
return intent;
}
public ListItem itemForPosition(int position) {
if (mActivitiesList == null) {
return null;
}
return mActivitiesList.get(position);
}
public int getCount() {
return mActivitiesList != null ? mActivitiesList.size() : 0;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
View view;
if (convertView == null) {
view = mInflater.inflate(
com.android.internal.R.layout.activity_list_item_2, parent, false);
} else {
view = convertView;
}
bindView(view, mActivitiesList.get(position));
return view;
}
private void bindView(View view, ListItem item) {
TextView text = (TextView) view;
text.setText(item.label);
if (item.icon == null) {
item.icon = mIconResizer.createIconThumbnail(
item.resolveInfo.loadIcon(getPackageManager()));
}
text.setCompoundDrawablesWithIntrinsicBounds(item.icon, null, null, null);
}
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ArrayFilter();
}
return mFilter;
}
/**
* An array filters constrains the content of the array adapter with a prefix. Each
* item that does not start with the supplied prefix is removed from the list.
*/
private class ArrayFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence prefix) {
FilterResults results = new FilterResults();
if (mOriginalValues == null) {
synchronized (lock) {
mOriginalValues = new ArrayList<ListItem>(mActivitiesList);
}
}
if (prefix == null || prefix.length() == 0) {
synchronized (lock) {
ArrayList<ListItem> list = new ArrayList(mOriginalValues);
results.values = list;
results.count = list.size();
}
} else {
final String prefixString = prefix.toString().toLowerCase();
ArrayList<ListItem> values = mOriginalValues;
int count = values.size();
ArrayList<ListItem> newValues = new ArrayList(count);
for (int i = 0; i < count; i++) {
ListItem item = values.get(i);
String[] words = item.label.toString().toLowerCase().split(" ");
int wordCount = words.length;
for (int k = 0; k < wordCount; k++) {
final String word = words[k];
if (word.startsWith(prefixString)) {
newValues.add(item);
break;
}
}
}
results.values = newValues;
results.count = newValues.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
//noinspection unchecked
mActivitiesList = (List<ListItem>) results.values;
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
}
/**
* Utility class to resize icons to match default icon size.
*/
public class IconResizer {
// Code is borrowed from com.android.launcher.Utilities.
private int mIconWidth = -1;
private int mIconHeight = -1;
private final Rect mOldBounds = new Rect();
private Canvas mCanvas = new Canvas();
public IconResizer() {
mCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
Paint.FILTER_BITMAP_FLAG));
final Resources resources = LauncherActivity.this.getResources();
mIconWidth = mIconHeight = (int) resources.getDimension(
android.R.dimen.app_icon_size);
}
/**
* Returns a Drawable representing the thumbnail of the specified Drawable.
* The size of the thumbnail is defined by the dimension
* android.R.dimen.launcher_application_icon_size.
*
* This method is not thread-safe and should be invoked on the UI thread only.
*
* @param icon The icon to get a thumbnail of.
*
* @return A thumbnail for the specified icon or the icon itself if the
* thumbnail could not be created.
*/
public Drawable createIconThumbnail(Drawable icon) {
int width = mIconWidth;
int height = mIconHeight;
final int iconWidth = icon.getIntrinsicWidth();
final int iconHeight = icon.getIntrinsicHeight();
if (icon instanceof PaintDrawable) {
PaintDrawable painter = (PaintDrawable) icon;
painter.setIntrinsicWidth(width);
painter.setIntrinsicHeight(height);
}
if (width > 0 && height > 0) {
if (width < iconWidth || height < iconHeight) {
final float ratio = (float) iconWidth / iconHeight;
if (iconWidth > iconHeight) {
height = (int) (width / ratio);
} else if (iconHeight > iconWidth) {
width = (int) (height * ratio);
}
final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
final Canvas canvas = mCanvas;
canvas.setBitmap(thumb);
// Copy the old bounds to restore them later
// If we were to do oldBounds = icon.getBounds(),
// the call to setBounds() that follows would
// change the same instance and we would lose the
// old bounds
mOldBounds.set(icon.getBounds());
final int x = (mIconWidth - width) / 2;
final int y = (mIconHeight - height) / 2;
icon.setBounds(x, y, x + width, y + height);
icon.draw(canvas);
icon.setBounds(mOldBounds);
icon = new BitmapDrawable(getResources(), thumb);
} else if (iconWidth < width && iconHeight < height) {
final Bitmap.Config c = Bitmap.Config.ARGB_8888;
final Bitmap thumb = Bitmap.createBitmap(mIconWidth, mIconHeight, c);
final Canvas canvas = mCanvas;
canvas.setBitmap(thumb);
mOldBounds.set(icon.getBounds());
final int x = (width - iconWidth) / 2;
final int y = (height - iconHeight) / 2;
icon.setBounds(x, y, x + iconWidth, y + iconHeight);
icon.draw(canvas);
icon.setBounds(mOldBounds);
icon = new BitmapDrawable(getResources(), thumb);
}
}
return icon;
}
}
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
mPackageManager = getPackageManager();
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setProgressBarIndeterminateVisibility(true);
onSetContentView();
mIconResizer = new IconResizer();
mIntent = new Intent(getTargetIntent());
mIntent.setComponent(null);
mAdapter = new ActivityAdapter(mIconResizer);
setListAdapter(mAdapter);
getListView().setTextFilterEnabled(true);
setProgressBarIndeterminateVisibility(false);
}
/**
* Override to call setContentView() with your own content view to
* customize the list layout.
*/
protected void onSetContentView() {
setContentView(com.android.internal.R.layout.activity_list);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
Intent intent = intentForPosition(position);
startActivity(intent);
}
/**
* Return the actual Intent for a specific position in our
* {@link android.widget.ListView}.
* @param position The item whose Intent to return
*/
protected Intent intentForPosition(int position) {
ActivityAdapter adapter = (ActivityAdapter) mAdapter;
return adapter.intentForPosition(position);
}
/**
* Return the {@link ListItem} for a specific position in our
* {@link android.widget.ListView}.
* @param position The item to return
*/
protected ListItem itemForPosition(int position) {
ActivityAdapter adapter = (ActivityAdapter) mAdapter;
return adapter.itemForPosition(position);
}
/**
* Get the base intent to use when running
* {@link PackageManager#queryIntentActivities(Intent, int)}.
*/
protected Intent getTargetIntent() {
return new Intent();
}
/**
* Perform query on package manager for list items. The default
* implementation queries for activities.
*/
protected List<ResolveInfo> onQueryPackageManager(Intent queryIntent) {
return mPackageManager.queryIntentActivities(queryIntent, /* no flags */ 0);
}
/**
* Perform the query to determine which results to show and return a list of them.
*/
public List<ListItem> makeListItems() {
// Load all matching activities and sort correctly
List<ResolveInfo> list = onQueryPackageManager(mIntent);
Collections.sort(list, new ResolveInfo.DisplayNameComparator(mPackageManager));
ArrayList<ListItem> result = new ArrayList(list.size());
int listSize = list.size();
for (int i = 0; i < listSize; i++) {
ResolveInfo resolveInfo = list.get(i);
result.add(new ListItem(mPackageManager, resolveInfo, null));
}
return result;
}
}