Convert a Pdf page into Bitmap in Android Java

Question

I need to convert PDFfile(PDF page) into a Bitmap(or Image file) in Android.

1.Used Pdfbox jar from Apache. But it uses some java classes that is not supported in android. 2. Tried Itext jar which converts image to pdf(I need its reverse operation) Like that I have tried many jars. But no positive result.

byte[] bytes;     try {          File file = new File(this.getFilesDir().getAbsolutePath()+"/2010Q2_SDK_Overview.pdf");         FileInputStream is = new FileInputStream(file);          // Get the size of the file         long length = file.length();         bytes = new byte[(int) length];         int offset = 0;         int numRead = 0;         while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {             offset += numRead;         }           ByteBuffer buffer = ByteBuffer.NEW(bytes);         String data = Base64.encodeToString(bytes, Base64.DEFAULT);         PDFFile pdf_file = new PDFFile(buffer);         PDFPage page = pdf_file.getPage(2);          RectF rect = new RectF(0, 0, (int) page.getBBox().width(),                 (int) page.getBBox().height());       //  Bitmap bufferedImage = Bitmap.createBitmap((int)rect.width(), (int)rect.height(),          //        Bitmap.Config.ARGB_8888);          Bitmap image = page.getImage((int)rect.width(), (int)rect.height(), rect);         FileOutputStream os = new FileOutputStream(this.getFilesDir().getAbsolutePath()+"/pdf.jpg");         image.compress(Bitmap.CompressFormat.JPEG, 80, os);         // ((ImageView) findViewById(R.id.testView)).setImageBitmap(image); 

I am getting the Image File,

Instead of,

package com.test123;  import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream;  import com.sun.pdfview.PDFFile; import com.sun.pdfview.PDFPage; import net.sf.andpdf.nio.ByteBuffer;  import android.app.Activity; import android.graphics.Bitmap; import android.graphics.RectF; import android.os.Bundle; import android.util.Base64;  public class Test123Activity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          byte[] bytes;         try {              File file = new File(this.getFilesDir().getAbsolutePath()+"/2010Q2_SDK_Overview.pdf");             FileInputStream is = new FileInputStream(file);              // Get the size of the file             long length = file.length();             bytes = new byte[(int) length];             int offset = 0;             int numRead = 0;             while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {                 offset += numRead;             }               ByteBuffer buffer = ByteBuffer.NEW(bytes);             String data = Base64.encodeToString(bytes, Base64.DEFAULT);             PDFFile pdf_file = new PDFFile(buffer);             PDFPage page = pdf_file.getPage(2);              RectF rect = new RectF(0, 0, (int) page.getBBox().width(),                     (int) page.getBBox().height());           //  Bitmap bufferedImage = Bitmap.createBitmap((int)rect.width(), (int)rect.height(),              //        Bitmap.Config.ARGB_8888);              Bitmap image = page.getImage((int)rect.width(), (int)rect.height(), rect);             FileOutputStream os = new FileOutputStream(this.getFilesDir().getAbsolutePath()+"/pdf.jpg");             image.compress(Bitmap.CompressFormat.JPEG, 80, os);              //((ImageView) findViewById(R.id.testView)).setImageBitmap(image);          } catch (Exception e) {             e.printStackTrace();         }     } } 

Else, any other way to display pdf file in android using function inbuilt within application?

Answer 1

I solved this issue. it's as simple as letting the device have time to render each page.

To fix this all you have to do is change

PDFPage page = pdf_file.getPage(2); 

to

PDFPage page = pdf_file.getPage(2, true); 

Firstly to view a PDF in Android you have to convert the PDF into images then display them to the user. (I am going to use a webview)

So to do this we need this library. It is my edited version of this git.

After you have imported the library into your project you need to create your activity.

The XML:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent">      <WebView             android:id="@+id/webView1"             android:layout_width="match_parent"             android:layout_height="match_parent"/>  </LinearLayout> 

The java:

//Imports: import android.app.Activity; import android.app.ProgressDialog; import android.content.Intent; import android.graphics.Bitmap; import android.os.AsyncTask; import android.os.Bundle; import android.os.Environment; import android.util.Base64; import android.util.Log; import android.view.View; import android.view.ViewTreeObserver; import android.webkit.WebView; import com.sun.pdfview.PDFFile; import com.sun.pdfview.PDFImage; import com.sun.pdfview.PDFPage; import com.sun.pdfview.PDFPaint; import net.sf.andpdf.nio.ByteBuffer; import net.sf.andpdf.refs.HardReference; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.RandomAccessFile; import java.nio.channels.FileChannel;  //Globals: private WebView wv; private int ViewSize = 0;  //OnCreate Method: @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     //Settings     PDFImage.sShowImages = true; // show images     PDFPaint.s_doAntiAlias = true; // make text smooth     HardReference.sKeepCaches = true; // save images in cache      //Setup webview     wv = (WebView)findViewById(R.id.webView1);     wv.getSettings().setBuiltInZoomControls(true);//show zoom buttons     wv.getSettings().setSupportZoom(true);//allow zoom     //get the width of the webview     wv.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener()     {         @Override         public void onGlobalLayout()         {             ViewSize = wv.getWidth();             wv.getViewTreeObserver().removeGlobalOnLayoutListener(this);         }     });      try     {         File file = new File(Environment.getExternalStorageDirectory().getPath() + "/randompdf.pdf");         RandomAccessFile f = new RandomAccessFile(file, "r");         byte[] data = new byte[(int)f.length()];         f.readFully(data);         pdfLoadImages(data);     }     catch(Exception ignored)     {     } }  //Load Images: private void pdfLoadImages(final byte[] data) {     try     {         // run async         new AsyncTask<Void, Void, String>()         {             // create and show a progress dialog             ProgressDialog progressDialog = ProgressDialog.show(MainActivity.this, "", "Opening...");              @Override             protected void onPostExecute(String html)             {                 //after async close progress dialog                 progressDialog.dismiss();                 //load the html in the webview                 wv.loadDataWithBaseURL("", html, "text/html","UTF-8", "");             }              @Override             protected String doInBackground(Void... params)             {                 try                 {                     //create pdf document object from bytes                     ByteBuffer bb = ByteBuffer.NEW(data);                     PDFFile pdf = new PDFFile(bb);                     //Get the first page from the pdf doc                     PDFPage PDFpage = pdf.getPage(1, true);                     //create a scaling value according to the WebView Width                     final float scale = ViewSize / PDFpage.getWidth() * 0.95f;                     //convert the page into a bitmap with a scaling value                     Bitmap page = PDFpage.getImage((int)(PDFpage.getWidth() * scale), (int)(PDFpage.getHeight() * scale), null, true, true);                     //save the bitmap to a byte array                     ByteArrayOutputStream stream = new ByteArrayOutputStream();                     page.compress(Bitmap.CompressFormat.PNG, 100, stream);                     byte[] byteArray = stream.toByteArray();                     stream.reset();                     //convert the byte array to a base64 string                     String base64 = Base64.encodeToString(byteArray, Base64.NO_WRAP);                     //create the html + add the first image to the html                     String html = "<!DOCTYPE html><html><body bgcolor=\"#b4b4b4\"><img src=\"data:image/png;base64,"+base64+"\" hspace=10 vspace=10><br>";                     //loop though the rest of the pages and repeat the above                     for(int i = 2; i <= pdf.getNumPages(); i++)                     {                         PDFpage = pdf.getPage(i, true);                         page = PDFpage.getImage((int)(PDFpage.getWidth() * scale), (int)(PDFpage.getHeight() * scale), null, true, true);                         page.compress(Bitmap.CompressFormat.PNG, 100, stream);                         byteArray = stream.toByteArray();                         stream.reset();                         base64 = Base64.encodeToString(byteArray, Base64.NO_WRAP);                         html += "<img src=\"data:image/png;base64,"+base64+"\" hspace=10 vspace=10><br>";                     }                     stream.close();                     html += "</body></html>";                     return html;                 }                 catch (Exception e)                 {                     Log.d("error", e.toString());                 }                 return null;             }         }.execute();         System.gc();// run GC     }     catch (Exception e)     {         Log.d("error", e.toString());     } }