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