LAPTOP i7

Display PDF using PdfRenderer

The class android.graphics.pdf.PdfRenderer enables rendering a PDF document. This example show how to:


MainActivity.java

package com.blogspot.android_er.androidpdf;

import android.graphics.Bitmap;
import android.graphics.pdf.PdfRenderer;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

 String targetPdf = "/sdcard/MagPi54.pdf";

 ImageView pdfView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 pdfView = (ImageView)findViewById(R.id.pdfview);

 try {
 openPDF();
 } catch (IOException e) {
 e.printStackTrace();
 Toast.makeText(this,
 "Something Wrong: " + e.toString(),
 Toast.LENGTH_LONG).show();
 }
 }

 private void openPDF() throws IOException {
 File file = new File(targetPdf);

 ParcelFileDescriptor fileDescriptor = null;
 fileDescriptor = ParcelFileDescriptor.open(
 file, ParcelFileDescriptor.MODE_READ_ONLY);

 //min. API Level 21
 PdfRenderer pdfRenderer = null;
 pdfRenderer = new PdfRenderer(fileDescriptor);

 final int pageCount = pdfRenderer.getPageCount();
 Toast.makeText(this,
 "pageCount = " + pageCount,
 Toast.LENGTH_LONG).show();

 //Display page 0
 PdfRenderer.Page rendererPage = pdfRenderer.openPage(0);
 int rendererPageWidth = rendererPage.getWidth();
 int rendererPageHeight = rendererPage.getHeight();
 Bitmap bitmap = Bitmap.createBitmap(
 rendererPageWidth,
 rendererPageHeight,
 Bitmap.Config.ARGB_8888);
 rendererPage.render(bitmap, null, null,
 PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);

 pdfView.setImageBitmap(bitmap);
 rendererPage.close();

 pdfRenderer.close();
 fileDescriptor.close();
 }
}

layout/activity_main.xml, add a ImageView to display the PDF:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 
 
 android_id="@+id/activity_main"
 android_layout_width="match_parent"
 android_layout_height="match_parent"
 android_paddingBottom="@dimen/activity_vertical_margin"
 android_paddingLeft="@dimen/activity_horizontal_margin"
 android_paddingRight="@dimen/activity_horizontal_margin"
 android_paddingTop="@dimen/activity_vertical_margin"
 android_orientation="vertical"
 tools_context="com.blogspot.android_er.androidpdf.MainActivity">

 <TextView
 android_layout_width="wrap_content"
 android_layout_height="wrap_content"
 android_layout_margin="20dp"
 android_layout_gravity="center_horizontal"
 android_autoLink="web"
 android_text="http://android-er.blogspot.com/"
 android_textStyle="bold"/>

 <ImageView
 android_id="@+id/pdfview"
 android_layout_width="match_parent"
 android_layout_height="match_parent" />
</LinearLayout>

uses-permission of "android.permission.READ_EXTERNAL_STORAGE" is needed in AndroidManifest.xml to read file from sdcard.

<?xml version="1.0" encoding="utf-8"?>
<manifest 
 package="com.blogspot.android_er.androidpdf">

 <application
 android_allowBackup="true"
 android_icon="@mipmap/ic_launcher"
 android_label="@string/app_name"
 android_supportsRtl="true"
 android_theme="@style/AppTheme">
 <activity android_name=".MainActivity">
 <intent-filter>
 <action android_name="android.intent.action.MAIN" />

 <category android_name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>
 <uses-permission android_name="android.permission.READ_EXTERNAL_STORAGE"/>

</manifest>

Next:
- Display PDF in assets folder (inside APK)

Related:
- Create PDF using PdfDocument