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 foo.bar.print; 18 19 import java.io.FileOutputStream; 20 import java.io.IOException; 21 import java.util.ArrayList; 22 import java.util.List; 23 24 import android.app.Activity; 25 import android.content.Context; 26 import android.graphics.pdf.PdfDocument.Page; 27 import android.os.AsyncTask; 28 import android.os.Bundle; 29 import android.os.CancellationSignal; 30 import android.os.CancellationSignal.OnCancelListener; 31 import android.os.ParcelFileDescriptor; 32 import android.print.PageRange; 33 import android.print.PrintAttributes; 34 import android.print.PrintDocumentAdapter; 35 import android.print.PrintDocumentInfo; 36 import android.print.PrintManager; 37 import android.print.pdf.PrintedPdfDocument; 38 import android.util.SparseIntArray; 39 import android.view.Menu; 40 import android.view.MenuItem; 41 import android.view.View; 42 43 /** 44 * Simple sample of how to use the print APIs. 45 */ 46 public class PrintActivity extends Activity { 47 48 public static final String LOG_TAG = "PrintActivity"; 49 50 private static final int PAGE_COUNT = 5; 51 52 @Override 53 protected void onCreate(Bundle savedInstanceState) { 54 super.onCreate(savedInstanceState); 55 setContentView(R.layout.activity_main); 56 } 57 58 @Override 59 public boolean onCreateOptionsMenu(Menu menu) { 60 super.onCreateOptionsMenu(menu); 61 getMenuInflater().inflate(R.menu.activity_main, menu); 62 return true; 63 } 64 65 @Override 66 public boolean onOptionsItemSelected(MenuItem item) { 67 if (item.getItemId() == R.id.menu_print) { 68 printView(); 69 return true; 70 } 71 return super.onOptionsItemSelected(item); 72 } 73 74 private void printView() { 75 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE); 76 final View view = findViewById(R.id.content); 77 78 printManager.print("Print_View", 79 new PrintDocumentAdapter() { 80 private static final int RESULT_LAYOUT_FAILED = 1; 81 private static final int RESULT_LAYOUT_FINISHED = 2; 82 83 private PrintAttributes mPrintAttributes; 84 85 @Override 86 public void onLayout(final PrintAttributes oldAttributes, 87 final PrintAttributes newAttributes, 88 final CancellationSignal cancellationSignal, 89 final LayoutResultCallback callback, 90 final Bundle metadata) { 91 92 new AsyncTask<Void, Void, Integer>() { 93 @Override 94 protected void onPreExecute() { 95 // First register for cancellation requests. 96 cancellationSignal.setOnCancelListener(new OnCancelListener() { 97 @Override 98 public void onCancel() { 99 cancel(true); 100 } 101 }); 102 mPrintAttributes = newAttributes; 103 } 104 105 @Override 106 protected Integer doInBackground(Void... params) { 107 try { 108 // Pretend we do some layout work. 109 for (int i = 0; i < PAGE_COUNT; i++) { 110 // Be nice and respond to cancellation. 111 if (isCancelled()) { 112 return null; 113 } 114 pretendDoingLayoutWork(); 115 } 116 return RESULT_LAYOUT_FINISHED; 117 } catch (Exception e) { 118 return RESULT_LAYOUT_FAILED; 119 } 120 } 121 122 @Override 123 protected void onPostExecute(Integer result) { 124 // The task was not cancelled, so handle the layout result. 125 switch (result) { 126 case RESULT_LAYOUT_FINISHED: { 127 PrintDocumentInfo info = new PrintDocumentInfo 128 .Builder("print_view.pdf") 129 .setContentType(PrintDocumentInfo 130 .CONTENT_TYPE_DOCUMENT) 131 .setPageCount(PAGE_COUNT) 132 .build(); 133 callback.onLayoutFinished(info, false); 134 } break; 135 136 case RESULT_LAYOUT_FAILED: { 137 callback.onLayoutFailed(null); 138 } break; 139 } 140 } 141 142 @Override 143 protected void onCancelled(Integer result) { 144 // Task was cancelled, report that. 145 callback.onLayoutCancelled(); 146 } 147 148 private void pretendDoingLayoutWork() throws Exception { 149 150 } 151 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 152 } 153 154 @Override 155 public void onWrite(final PageRange[] pages, 156 final ParcelFileDescriptor destination, 157 final CancellationSignal canclleationSignal, 158 final WriteResultCallback callback) { 159 160 new AsyncTask<Void, Void, Integer>() { 161 private static final int RESULT_WRITE_FAILED = 1; 162 private static final int RESULT_WRITE_FINISHED = 2; 163 164 private final SparseIntArray mWrittenPages = new SparseIntArray(); 165 private final PrintedPdfDocument mPdfDocument = new PrintedPdfDocument( 166 PrintActivity.this, mPrintAttributes); 167 168 @Override 169 protected void onPreExecute() { 170 // First register for cancellation requests. 171 canclleationSignal.setOnCancelListener(new OnCancelListener() { 172 @Override 173 public void onCancel() { 174 cancel(true); 175 } 176 }); 177 178 for (int i = 0; i < PAGE_COUNT; i++) { 179 // Be nice and respond to cancellation. 180 if (isCancelled()) { 181 return; 182 } 183 184 // Write the page only if it was requested. 185 if (containsPage(pages, i)) { 186 mWrittenPages.append(mWrittenPages.size(), i); 187 Page page = mPdfDocument.startPage(i); 188 // The page of the PDF backed canvas size is in pixels (1/72") and 189 // smaller that the view. We scale down the drawn content and to 190 // fit. This does not lead to losing data as PDF is a vector format. 191 final float scale = (float) Math.min(mPdfDocument.getPageWidth(), 192 mPdfDocument.getPageHeight()) / Math.max(view.getWidth(), view.getHeight()); 193 page.getCanvas().scale(scale, scale); 194 view.draw(page.getCanvas()); 195 mPdfDocument.finishPage(page); 196 } 197 } 198 } 199 200 @Override 201 protected Integer doInBackground(Void... params) { 202 // Write the data and return success or failure. 203 try { 204 mPdfDocument.writeTo(new FileOutputStream( 205 destination.getFileDescriptor())); 206 return RESULT_WRITE_FINISHED; 207 } catch (IOException ioe) { 208 return RESULT_WRITE_FAILED; 209 } 210 } 211 212 @Override 213 protected void onPostExecute(Integer result) { 214 // The task was not cancelled, so handle the write result. 215 switch (result) { 216 case RESULT_WRITE_FINISHED: { 217 PageRange[] pageRanges = computePageRanges(mWrittenPages); 218 callback.onWriteFinished(pageRanges); 219 } break; 220 221 case RESULT_WRITE_FAILED: { 222 callback.onWriteFailed(null); 223 } break; 224 } 225 226 mPdfDocument.close(); 227 } 228 229 @Override 230 protected void onCancelled(Integer result) { 231 // Task was cancelled, report that. 232 callback.onWriteCancelled(); 233 mPdfDocument.close(); 234 } 235 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 236 } 237 238 private PageRange[] computePageRanges(SparseIntArray writtenPages) { 239 List<PageRange> pageRanges = new ArrayList<PageRange>(); 240 241 int start = -1; 242 int end = -1; 243 final int writtenPageCount = writtenPages.size(); 244 for (int i = 0; i < writtenPageCount; i++) { 245 if (start < 0) { 246 start = writtenPages.valueAt(i); 247 } 248 int oldEnd = end = start; 249 while (i < writtenPageCount && (end - oldEnd) <= 1) { 250 oldEnd = end; 251 end = writtenPages.valueAt(i); 252 i++; 253 } 254 PageRange pageRange = new PageRange(start, end); 255 pageRanges.add(pageRange); 256 start = end = -1; 257 } 258 259 PageRange[] pageRangesArray = new PageRange[pageRanges.size()]; 260 pageRanges.toArray(pageRangesArray); 261 return pageRangesArray; 262 } 263 264 private boolean containsPage(PageRange[] pageRanges, int page) { 265 final int pageRangeCount = pageRanges.length; 266 for (int i = 0; i < pageRangeCount; i++) { 267 if (pageRanges[i].getStart() <= page 268 && pageRanges[i].getEnd() >= page) { 269 return true; 270 } 271 } 272 return false; 273 } 274 }, null); 275 } 276 } 277
