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      1 /*
      2  * Copyright (C) 2006 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.example.android.home;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.os.Bundle;
     22 import android.util.Log;
     23 import android.view.MotionEvent;
     24 import android.view.View;
     25 import android.view.ViewGroup;
     26 import android.view.Window;
     27 import android.widget.AdapterView;
     28 import android.widget.BaseAdapter;
     29 import android.widget.Gallery;
     30 import android.widget.ImageView;
     31 import android.widget.Gallery.LayoutParams;
     32 
     33 import java.io.IOException;
     34 import java.io.InputStream;
     35 
     36 /**
     37  * Wallpaper picker for the Home application. User can choose from
     38  * a gallery of stock photos.
     39  */
     40 public class Wallpaper extends Activity implements
     41         AdapterView.OnItemSelectedListener, AdapterView.OnItemClickListener {
     42 
     43     private static final String LOG_TAG = "Home";
     44 
     45     private static final Integer[] THUMB_IDS = {
     46             R.drawable.bg_android_icon,
     47             R.drawable.bg_sunrise_icon,
     48             R.drawable.bg_sunset_icon,
     49     };
     50 
     51     private static final Integer[] IMAGE_IDS = {
     52             R.drawable.bg_android,
     53             R.drawable.bg_sunrise,
     54             R.drawable.bg_sunset,
     55     };
     56 
     57     private Gallery mGallery;
     58     private boolean mIsWallpaperSet;
     59 
     60     @Override
     61     public void onCreate(Bundle icicle) {
     62         super.onCreate(icicle);
     63         requestWindowFeature(Window.FEATURE_NO_TITLE);
     64 
     65         setContentView(R.layout.wallpaper);
     66 
     67         mGallery = (Gallery) findViewById(R.id.gallery);
     68         mGallery.setAdapter(new ImageAdapter(this));
     69         mGallery.setOnItemSelectedListener(this);
     70         mGallery.setOnItemClickListener(this);
     71     }
     72 
     73     @Override
     74     protected void onResume() {
     75         super.onResume();
     76         mIsWallpaperSet = false;
     77     }
     78 
     79     public void onItemSelected(AdapterView parent, View v, int position, long id) {
     80         getWindow().setBackgroundDrawableResource(IMAGE_IDS[position]);
     81     }
     82 
     83     public void onItemClick(AdapterView parent, View v, int position, long id) {
     84         selectWallpaper(position);
     85     }
     86 
     87     /*
     88      * When using touch if you tap an image it triggers both the onItemClick and
     89      * the onTouchEvent causing the wallpaper to be set twice. Synchronize this
     90      * method and ensure we only set the wallpaper once.
     91      */
     92     private synchronized void selectWallpaper(int position) {
     93         if (mIsWallpaperSet) {
     94             return;
     95         }
     96         mIsWallpaperSet = true;
     97         try {
     98             InputStream stream = getResources().openRawResource(IMAGE_IDS[position]);
     99             setWallpaper(stream);
    100             setResult(RESULT_OK);
    101             finish();
    102         } catch (IOException e) {
    103             Log.e(LOG_TAG, "Failed to set wallpaper " + e);
    104         }
    105     }
    106 
    107     public void onNothingSelected(AdapterView parent) {
    108     }
    109 
    110     @Override
    111     public boolean onTouchEvent(MotionEvent event) {
    112         selectWallpaper(mGallery.getSelectedItemPosition());
    113         return true;
    114     }
    115 
    116     public class ImageAdapter extends BaseAdapter {
    117 
    118         private Context mContext;
    119 
    120         public ImageAdapter(Context c) {
    121             mContext = c;
    122         }
    123 
    124         public int getCount() {
    125             return THUMB_IDS.length;
    126         }
    127 
    128         public Object getItem(int position) {
    129             return position;
    130         }
    131 
    132         public long getItemId(int position) {
    133             return position;
    134         }
    135 
    136         public View getView(final int position, View convertView, ViewGroup parent) {
    137             ImageView i = new ImageView(mContext);
    138 
    139             i.setImageResource(THUMB_IDS[position]);
    140             i.setAdjustViewBounds(true);
    141             i.setLayoutParams(new Gallery.LayoutParams(
    142                     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    143             i.setBackgroundResource(android.R.drawable.picture_frame);
    144             return i;
    145         }
    146 
    147     }
    148 
    149 }
    150 
    151 
    152