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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings;
     18 
     19 import android.app.Activity;
     20 import android.app.AlertDialog.Builder;
     21 import android.content.Context;
     22 import android.content.pm.ApplicationInfo;
     23 import android.content.pm.PackageManager;
     24 import android.content.pm.PackageManager.NameNotFoundException;
     25 import android.graphics.drawable.Drawable;
     26 import android.preference.ListPreference;
     27 import android.util.AttributeSet;
     28 import android.view.LayoutInflater;
     29 import android.view.View;
     30 import android.view.ViewGroup;
     31 import android.widget.ArrayAdapter;
     32 import android.widget.CheckedTextView;
     33 import android.widget.ImageView;
     34 import android.widget.ListAdapter;
     35 
     36 /**
     37  * Extends ListPreference to allow us to show the icons for a given list of applications. We do this
     38  * because the names of applications are very similar and the user may not be able to determine what
     39  * app they are selecting without an icon.
     40  */
     41 public class AppListPreference extends ListPreference {
     42     private Drawable[] mEntryDrawables;
     43 
     44     public class AppArrayAdapter extends ArrayAdapter<CharSequence> {
     45         private Drawable[] mImageDrawables = null;
     46         private int mSelectedIndex = 0;
     47 
     48         public AppArrayAdapter(Context context, int textViewResourceId,
     49                 CharSequence[] objects, Drawable[] imageDrawables, int selectedIndex) {
     50             super(context, textViewResourceId, objects);
     51             mSelectedIndex = selectedIndex;
     52             mImageDrawables = imageDrawables;
     53         }
     54 
     55         @Override
     56         public View getView(int position, View convertView, ViewGroup parent) {
     57             LayoutInflater inflater = ((Activity)getContext()).getLayoutInflater();
     58             View view = inflater.inflate(R.layout.app_preference_item, parent, false);
     59             CheckedTextView checkedTextView = (CheckedTextView)view.findViewById(R.id.app_label);
     60             checkedTextView.setText(getItem(position));
     61             if (position == mSelectedIndex) {
     62                 checkedTextView.setChecked(true);
     63             }
     64             ImageView imageView = (ImageView)view.findViewById(R.id.app_image);
     65             imageView.setImageDrawable(mImageDrawables[position]);
     66             return view;
     67         }
     68     }
     69 
     70     public AppListPreference(Context context, AttributeSet attrs,
     71             int defStyleAttr, int defStyleRes) {
     72         super(context, attrs, defStyleAttr, defStyleRes);
     73     }
     74 
     75     public AppListPreference(Context context, AttributeSet attrs) {
     76         super(context, attrs);
     77     }
     78 
     79     public void setPackageNames(String[] packageNames, String defaultPackageName) {
     80         // Look up all package names in PackageManager. Skip ones we can't find.
     81         int foundPackages = 0;
     82         PackageManager pm = getContext().getPackageManager();
     83         ApplicationInfo[] appInfos = new ApplicationInfo[packageNames.length];
     84         for (int i = 0; i < packageNames.length; i++) {
     85             try {
     86                 appInfos[i] = pm.getApplicationInfo(packageNames[i], 0);
     87                 foundPackages++;
     88             } catch (NameNotFoundException e) {
     89                 // Leave appInfos[i] uninitialized; it will be skipped in the list.
     90             }
     91         }
     92 
     93         // Show the label and icon for each application package.
     94         CharSequence[] applicationNames = new CharSequence[foundPackages];
     95         mEntryDrawables = new Drawable[foundPackages];
     96         int index = 0;
     97         int selectedIndex = -1;
     98         for (ApplicationInfo appInfo : appInfos) {
     99             if (appInfo != null) {
    100                 applicationNames[index] = appInfo.loadLabel(pm);
    101                 mEntryDrawables[index] = appInfo.loadIcon(pm);
    102                 if (defaultPackageName != null &&
    103                         appInfo.packageName.contentEquals(defaultPackageName)) {
    104                     selectedIndex = index;
    105                 }
    106                 index++;
    107             }
    108         }
    109         setEntries(applicationNames);
    110         setEntryValues(packageNames);
    111         if (selectedIndex != -1) {
    112             setValueIndex(selectedIndex);
    113         } else {
    114             setValue(null);
    115         }
    116     }
    117 
    118     @Override
    119     protected void onPrepareDialogBuilder(Builder builder) {
    120         int selectedIndex = findIndexOfValue(getValue());
    121         ListAdapter adapter = new AppArrayAdapter(getContext(),
    122             R.layout.app_preference_item, getEntries(), mEntryDrawables, selectedIndex);
    123         builder.setAdapter(adapter, this);
    124         super.onPrepareDialogBuilder(builder);
    125     }
    126 }
    127