Display PDF in assets folder (inside APK)

The example "Display PDF using PdfRenderer" show how to display PDF stored in sdcard, this example show how to display PDF stored in assets inside APK.

First, you have to create assets folder and copy your PDF into it.


Then you have to edit aaptOptions in build.gradle (Module: app), not to compass "pdf" file.

    aaptOptions {
        noCompress "pdf"
    }

Layout file, refer to the example "Create PDF using PdfDocument".

MainActivity.java

package com.blogspot.android_er.androidpdf;

import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
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.IOException;

public class MainActivity extends AppCompatActivity {

    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 {

        //open file in assets

        AssetManager assetManager = getAssets();
        AssetFileDescriptor assetFileDescriptor = 
                assetManager.openFd("test.pdf");
        ParcelFileDescriptor fileDescriptor = 
                assetFileDescriptor.getParcelFileDescriptor();

        //open file from sdcard
        /*
        String targetPdf = "/sdcard/test.pdf";
        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(1);
        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();

        assetFileDescriptor.close();
    }
}

Remark: If you reported with the error "java.io.IOException: not create document. Error:", read next post.

Create PDF using PdfDocument

android.graphics.pdf.PdfDocument enables generating a PDF document from native Android content. This example show how to create a two page PDF file using PdfDocument, store as "/sdcard/test.pdf". Then use last example Display PDF using PdfRenderer to view it.

(remark: if you use last example to view the PDF file, you have to change targetPdf = "/sdcard/test.pdf".)


MainActivity.java

package com.blogspot.android_er.androidcreatepdf;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.pdf.PdfDocument;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {

    Button btnCreate;

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

        btnCreate = (Button)findViewById(R.id.create);
        btnCreate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                createPdf();
            }
        });

    }

    private void createPdf(){
        // create a new document
        PdfDocument document = new PdfDocument();

        // crate a page description
        PdfDocument.PageInfo pageInfo = 
                new PdfDocument.PageInfo.Builder(100, 100, 1).create();

        // start a page
        PdfDocument.Page page = document.startPage(pageInfo);

        Canvas canvas = page.getCanvas();

        Paint paint = new Paint();
        paint.setColor(Color.RED);

        canvas.drawCircle(50, 50, 30, paint);

        // finish the page
        document.finishPage(page);

        // Create Page 2
        pageInfo = new PdfDocument.PageInfo.Builder(500, 500, 2).create();
        page = document.startPage(pageInfo);
        canvas = page.getCanvas();
        paint = new Paint();
        paint.setColor(Color.BLUE);
        canvas.drawCircle(200, 200, 100, paint);
        document.finishPage(page);

        // write the document content
        String targetPdf = "/sdcard/test.pdf";
        File filePath = new File(targetPdf);
        try {
            document.writeTo(new FileOutputStream(filePath));
            Toast.makeText(this, "Done", Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            e.printStackTrace();
            Toast.makeText(this, "Something wrong: " + e.toString(),
                    Toast.LENGTH_LONG).show();
        }

        // close the document
        document.close();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    android:orientation="vertical"
    tools:context="com.blogspot.android_er.androidcreatepdf.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"/>

    <Button
        android:id="@+id/create"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Create PDF"/>
</LinearLayout>

uses-permission of "android.permission.WRITE_EXTERNAL_STORAGE" is needed in AndroidManifest.xml.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.blogspot.android_er.androidcreatepdf">

    <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.WRITE_EXTERNAL_STORAGE"/>

</manifest>

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
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    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 xmlns:android="http://schemas.android.com/apk/res/android"
    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