1 /* 2 * Copyright (C) 2010 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.browser; 18 19 import android.app.ProgressDialog; 20 import android.app.WallpaperManager; 21 import android.content.Context; 22 import android.content.DialogInterface; 23 import android.graphics.Bitmap; 24 import android.graphics.BitmapFactory; 25 import android.graphics.Canvas; 26 import android.graphics.drawable.Drawable; 27 import android.util.Log; 28 import android.view.MenuItem; 29 import android.view.MenuItem.OnMenuItemClickListener; 30 import java.io.BufferedInputStream; 31 import java.io.ByteArrayInputStream; 32 import java.io.IOException; 33 import java.io.InputStream; 34 import java.net.MalformedURLException; 35 import java.net.URL; 36 37 /** 38 * Handle setWallpaper requests 39 * 40 */ 41 public class WallpaperHandler extends Thread 42 implements OnMenuItemClickListener, DialogInterface.OnCancelListener { 43 44 private static final String LOGTAG = "WallpaperHandler"; 45 // This should be large enough for BitmapFactory to decode the header so 46 // that we can mark and reset the input stream to avoid duplicate network i/o 47 private static final int BUFFER_SIZE = 128 * 1024; 48 49 private Context mContext; 50 private String mUrl; 51 private ProgressDialog mWallpaperProgress; 52 private boolean mCanceled = false; 53 WallpaperHandler(Context context, String url)54 public WallpaperHandler(Context context, String url) { 55 mContext = context; 56 mUrl = url; 57 } 58 59 @Override onCancel(DialogInterface dialog)60 public void onCancel(DialogInterface dialog) { 61 mCanceled = true; 62 } 63 64 @Override onMenuItemClick(MenuItem item)65 public boolean onMenuItemClick(MenuItem item) { 66 if (mUrl != null && getState() == State.NEW) { 67 // The user may have tried to set a image with a large file size as 68 // their background so it may take a few moments to perform the 69 // operation. 70 // Display a progress spinner while it is working. 71 mWallpaperProgress = new ProgressDialog(mContext); 72 mWallpaperProgress.setIndeterminate(true); 73 mWallpaperProgress.setMessage(mContext.getResources() 74 .getText(R.string.progress_dialog_setting_wallpaper)); 75 mWallpaperProgress.setCancelable(true); 76 mWallpaperProgress.setOnCancelListener(this); 77 mWallpaperProgress.show(); 78 start(); 79 } 80 return true; 81 } 82 83 @Override run()84 public void run() { 85 WallpaperManager wm = WallpaperManager.getInstance(mContext); 86 Drawable oldWallpaper = wm.getDrawable(); 87 InputStream inputstream = null; 88 try { 89 // TODO: This will cause the resource to be downloaded again, when 90 // we should in most cases be able to grab it from the cache. To fix 91 // this we should query WebCore to see if we can access a cached 92 // version and instead open an input stream on that. This pattern 93 // could also be used in the download manager where the same problem 94 // exists. 95 inputstream = openStream(); 96 if (inputstream != null) { 97 if (!inputstream.markSupported()) { 98 inputstream = new BufferedInputStream(inputstream, BUFFER_SIZE); 99 } 100 inputstream.mark(BUFFER_SIZE); 101 BitmapFactory.Options options = new BitmapFactory.Options(); 102 options.inJustDecodeBounds = true; 103 // We give decodeStream a wrapped input stream so it doesn't 104 // mess with our mark (currently it sets a mark of 1024) 105 BitmapFactory.decodeStream( 106 new BufferedInputStream(inputstream), null, options); 107 int maxWidth = wm.getDesiredMinimumWidth(); 108 int maxHeight = wm.getDesiredMinimumHeight(); 109 // Give maxWidth and maxHeight some leeway 110 maxWidth *= 1.25; 111 maxHeight *= 1.25; 112 int bmWidth = options.outWidth; 113 int bmHeight = options.outHeight; 114 115 int scale = 1; 116 while (bmWidth > maxWidth || bmHeight > maxHeight) { 117 scale <<= 1; 118 bmWidth >>= 1; 119 bmHeight >>= 1; 120 } 121 options.inJustDecodeBounds = false; 122 options.inSampleSize = scale; 123 try { 124 inputstream.reset(); 125 } catch (IOException e) { 126 // BitmapFactory read more than we could buffer 127 // Re-open the stream 128 inputstream.close(); 129 inputstream = openStream(); 130 } 131 Bitmap scaledWallpaper = BitmapFactory.decodeStream(inputstream, 132 null, options); 133 if (scaledWallpaper != null) { 134 wm.setBitmap(scaledWallpaper); 135 } else { 136 Log.e(LOGTAG, "Unable to set new wallpaper, " + 137 "decodeStream returned null."); 138 } 139 } 140 } catch (IOException e) { 141 Log.e(LOGTAG, "Unable to set new wallpaper"); 142 // Act as though the user canceled the operation so we try to 143 // restore the old wallpaper. 144 mCanceled = true; 145 } finally { 146 if (inputstream != null) { 147 try { 148 inputstream.close(); 149 } catch (IOException e) { 150 // Ignore 151 } 152 } 153 } 154 155 if (mCanceled) { 156 // Restore the old wallpaper if the user cancelled whilst we were 157 // setting 158 // the new wallpaper. 159 int width = oldWallpaper.getIntrinsicWidth(); 160 int height = oldWallpaper.getIntrinsicHeight(); 161 Bitmap bm = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565); 162 Canvas canvas = new Canvas(bm); 163 oldWallpaper.setBounds(0, 0, width, height); 164 oldWallpaper.draw(canvas); 165 canvas.setBitmap(null); 166 try { 167 wm.setBitmap(bm); 168 } catch (IOException e) { 169 Log.e(LOGTAG, "Unable to restore old wallpaper."); 170 } 171 mCanceled = false; 172 } 173 174 if (mWallpaperProgress.isShowing()) { 175 mWallpaperProgress.dismiss(); 176 } 177 } 178 179 /** 180 * Opens the input stream for the URL that the class should 181 * use to set the wallpaper. Abstracts the difference between 182 * standard URLs and data URLs. 183 * @return An open InputStream for the data at the URL 184 * @throws IOException if there is an error opening the URL stream 185 * @throws MalformedURLException if the URL is malformed 186 */ openStream()187 private InputStream openStream() throws IOException, MalformedURLException { 188 InputStream inputStream = null; 189 if (DataUri.isDataUri(mUrl)) { 190 DataUri dataUri = new DataUri(mUrl); 191 inputStream = new ByteArrayInputStream(dataUri.getData()); 192 } else { 193 URL url = new URL(mUrl); 194 inputStream = url.openStream(); 195 } 196 return inputStream; 197 } 198 } 199