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.FileNotFoundException; 20 import java.io.FileOutputStream; 21 import java.io.IOException; 22 import java.util.ArrayList; 23 import java.util.List; 24 25 import android.app.Activity; 26 import android.content.Context; 27 import android.graphics.pdf.PdfDocument.Page; 28 import android.net.Uri; 29 import android.os.AsyncTask; 30 import android.os.Bundle; 31 import android.os.CancellationSignal; 32 import android.os.CancellationSignal.OnCancelListener; 33 import android.os.ParcelFileDescriptor; 34 import android.print.PageRange; 35 import android.print.PrintAttributes; 36 import android.print.PrintDocumentAdapter; 37 import android.print.PrintDocumentInfo; 38 import android.print.PrintManager; 39 import android.print.pdf.PrintedPdfDocument; 40 import android.support.v4.print.PrintHelper; 41 import android.util.SparseIntArray; 42 import android.view.Menu; 43 import android.view.MenuItem; 44 import android.view.View; 45 46 /** 47 * Simple sample of how to use the print APIs. 48 */ 49 public class PrintActivity extends Activity { 50 51 public static final String LOG_TAG = "PrintActivity"; 52 53 private static final int PAGE_COUNT = 5; 54 55 @Override 56 protected void onCreate(Bundle savedInstanceState) { 57 super.onCreate(savedInstanceState); 58 setContentView(R.layout.activity_main); 59 } 60 61 @Override 62 public boolean onCreateOptionsMenu(Menu menu) { 63 super.onCreateOptionsMenu(menu); 64 getMenuInflater().inflate(R.menu.activity_main, menu); 65 return true; 66 } 67 68 @Override 69 public boolean onOptionsItemSelected(MenuItem item) { 70 switch (item.getItemId()) { 71 case R.id.menu_print: 72 printView(); 73 return true; 74 case R.id.menu_print_uri_portrait_force: 75 case R.id.menu_print_uri_portrait: 76 case R.id.menu_print_uri_landscape: 77 try { 78 PrintHelper ph = new PrintHelper(this); 79 Uri uri = null; 80 switch (item.getItemId()) { 81 case R.id.menu_print_uri_portrait_force: 82 ph.setOrientation(PrintHelper.ORIENTATION_PORTRAIT); 83 /* fall through */ 84 case R.id.menu_print_uri_portrait: 85 uri = Uri.parse("android.resource://foo.bar.print/raw/portrait"); 86 break; 87 case R.id.menu_print_uri_landscape: 88 uri = Uri.parse("android.resource://foo.bar.print/raw/landscape"); 89 break; 90 } 91 92 ph.printBitmap("Print Uri", uri); 93 } catch (FileNotFoundException e) { 94 e.printStackTrace(); 95 } 96 return true; 97 default: 98 return super.onOptionsItemSelected(item); 99 } 100 } 101 102 private void printView() { 103 PrintManager printManager = (PrintManager) getSystemService(Context.PRINT_SERVICE); 104 final View view = findViewById(R.id.content); 105 106 printManager.print("Print_View", 107 new PrintDocumentAdapter() { 108 private static final int RESULT_LAYOUT_FAILED = 1; 109 private static final int RESULT_LAYOUT_FINISHED = 2; 110 111 private PrintAttributes mPrintAttributes; 112 113 @Override 114 public void onLayout(final PrintAttributes oldAttributes, 115 final PrintAttributes newAttributes, 116 final CancellationSignal cancellationSignal, 117 final LayoutResultCallback callback, 118 final Bundle metadata) { 119 120 new AsyncTask<Void, Void, Integer>() { 121 @Override 122 protected void onPreExecute() { 123 // First register for cancellation requests. 124 cancellationSignal.setOnCancelListener(new OnCancelListener() { 125 @Override 126 public void onCancel() { 127 cancel(true); 128 } 129 }); 130 mPrintAttributes = newAttributes; 131 } 132 133 @Override 134 protected Integer doInBackground(Void... params) { 135 try { 136 // Pretend we do some layout work. 137 for (int i = 0; i < PAGE_COUNT; i++) { 138 // Be nice and respond to cancellation. 139 if (isCancelled()) { 140 return null; 141 } 142 pretendDoingLayoutWork(); 143 } 144 return RESULT_LAYOUT_FINISHED; 145 } catch (Exception e) { 146 return RESULT_LAYOUT_FAILED; 147 } 148 } 149 150 @Override 151 protected void onPostExecute(Integer result) { 152 // The task was not cancelled, so handle the layout result. 153 switch (result) { 154 case RESULT_LAYOUT_FINISHED: { 155 PrintDocumentInfo info = new PrintDocumentInfo 156 .Builder("print_view.pdf") 157 .setContentType(PrintDocumentInfo 158 .CONTENT_TYPE_DOCUMENT) 159 .setPageCount(PAGE_COUNT) 160 .build(); 161 callback.onLayoutFinished(info, false); 162 } break; 163 164 case RESULT_LAYOUT_FAILED: { 165 callback.onLayoutFailed(null); 166 } break; 167 } 168 } 169 170 @Override 171 protected void onCancelled(Integer result) { 172 // Task was cancelled, report that. 173 callback.onLayoutCancelled(); 174 } 175 176 private void pretendDoingLayoutWork() throws Exception { 177 178 } 179 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 180 } 181 182 @Override 183 public void onWrite(final PageRange[] pages, 184 final ParcelFileDescriptor destination, 185 final CancellationSignal canclleationSignal, 186 final WriteResultCallback callback) { 187 188 new AsyncTask<Void, Void, Integer>() { 189 private static final int RESULT_WRITE_FAILED = 1; 190 private static final int RESULT_WRITE_FINISHED = 2; 191 192 private final SparseIntArray mWrittenPages = new SparseIntArray(); 193 private final PrintedPdfDocument mPdfDocument = new PrintedPdfDocument( 194 PrintActivity.this, mPrintAttributes); 195 196 @Override 197 protected void onPreExecute() { 198 // First register for cancellation requests. 199 canclleationSignal.setOnCancelListener(new OnCancelListener() { 200 @Override 201 public void onCancel() { 202 cancel(true); 203 } 204 }); 205 206 for (int i = 0; i < PAGE_COUNT; i++) { 207 // Be nice and respond to cancellation. 208 if (isCancelled()) { 209 return; 210 } 211 212 // Write the page only if it was requested. 213 if (containsPage(pages, i)) { 214 mWrittenPages.append(mWrittenPages.size(), i); 215 Page page = mPdfDocument.startPage(i); 216 // The page of the PDF backed canvas size is in pixels (1/72") and 217 // smaller that the view. We scale down the drawn content and to 218 // fit. This does not lead to losing data as PDF is a vector format. 219 final float scale = (float) Math.min(mPdfDocument.getPageWidth(), 220 mPdfDocument.getPageHeight()) / Math.max(view.getWidth(), view.getHeight()); 221 page.getCanvas().scale(scale, scale); 222 view.draw(page.getCanvas()); 223 mPdfDocument.finishPage(page); 224 } 225 } 226 } 227 228 @Override 229 protected Integer doInBackground(Void... params) { 230 // Write the data and return success or failure. 231 try { 232 mPdfDocument.writeTo(new FileOutputStream( 233 destination.getFileDescriptor())); 234 return RESULT_WRITE_FINISHED; 235 } catch (IOException ioe) { 236 return RESULT_WRITE_FAILED; 237 } 238 } 239 240 @Override 241 protected void onPostExecute(Integer result) { 242 // The task was not cancelled, so handle the write result. 243 switch (result) { 244 case RESULT_WRITE_FINISHED: { 245 PageRange[] pageRanges = computePageRanges(mWrittenPages); 246 callback.onWriteFinished(pageRanges); 247 } break; 248 249 case RESULT_WRITE_FAILED: { 250 callback.onWriteFailed(null); 251 } break; 252 } 253 254 mPdfDocument.close(); 255 } 256 257 @Override 258 protected void onCancelled(Integer result) { 259 // Task was cancelled, report that. 260 callback.onWriteCancelled(); 261 mPdfDocument.close(); 262 } 263 }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, (Void[]) null); 264 } 265 266 private PageRange[] computePageRanges(SparseIntArray writtenPages) { 267 List<PageRange> pageRanges = new ArrayList<PageRange>(); 268 269 int start = -1; 270 int end = -1; 271 final int writtenPageCount = writtenPages.size(); 272 for (int i = 0; i < writtenPageCount; i++) { 273 if (start < 0) { 274 start = writtenPages.valueAt(i); 275 } 276 int oldEnd = end = start; 277 while (i < writtenPageCount && (end - oldEnd) <= 1) { 278 oldEnd = end; 279 end = writtenPages.valueAt(i); 280 i++; 281 } 282 PageRange pageRange = new PageRange(start, end); 283 pageRanges.add(pageRange); 284 start = end = -1; 285 } 286 287 PageRange[] pageRangesArray = new PageRange[pageRanges.size()]; 288 pageRanges.toArray(pageRangesArray); 289 return pageRangesArray; 290 } 291 292 private boolean containsPage(PageRange[] pageRanges, int page) { 293 final int pageRangeCount = pageRanges.length; 294 for (int i = 0; i < pageRangeCount; i++) { 295 if (pageRanges[i].getStart() <= page 296 && pageRanges[i].getEnd() >= page) { 297 return true; 298 } 299 } 300 return false; 301 } 302 }, null); 303 } 304 } 305
