PDF Viewer UI and java

Designing a PDF viewer UI in Android Studio with Java involves creating an intuitive and functional layout for users to view and interact with PDF files. Below are the key components and a sample implementation:

1. UI Layout:

Use XML to design the user interface in activity_main.xml.

Include the following essential components:

A RecyclerView or ViewPager for page navigation (optional).

A PDFView (from libraries like com.github.barteksc:android-pdf-viewer).

Navigation buttons (e.g., Next, Previous, Zoom In/Out).

A search bar for finding text (optional).

2. Dependencies:

Add a PDF library like

Android PDF Viewer by Barteksc

Update your build.gradle file:

gradle

 implementation 'com.github.barteksc:android-pdf-viewer:3.2.0-beta.1'

3. Java Code:

Load a PDF file and handle interactions.

Handle permissions to read external storage if necessary.

XML Layout (activity_main.xml)

XML

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

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <!-- PDF Viewer -->

    <com.github.barteksc.pdfviewer.PDFView

        android:id="@+id/pdfView"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

    <!-- Navigation Buttons -->

    <LinearLayout

        android:id="@+id/nav_buttons"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true"

        android:orientation="horizontal"

        android:padding="10dp">

        <Button

            android:id="@+id/btnPrevious"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Previous" />

        <Button

            android:id="@+id/btnNext"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Next" />

    </LinearLayout>

</RelativeLayout>

Java Code (MainActivity.java)

Java

 import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import com.github.barteksc.pdfviewer.PDFView;

public class MainActivity extends AppCompatActivity {

    private PDFView pdfView;

    private Button btnPrevious, btnNext;

    private int currentPage = 0;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // Initialize components

        pdfView = findViewById(R.id.pdfView);

        btnPrevious = findViewById(R.id.btnPrevious);

        btnNext = findViewById(R.id.btnNext);

        // Load PDF from assets folder

        pdfView.fromAsset("sample.pdf")

                .enableSwipe(true)

                .swipeHorizontal(false)

                .onPageChange((page, pageCount) -> currentPage = page)

                .load();

        // Previous button

        btnPrevious.setOnClickListener(v -> {

            if (currentPage > 0) {

                currentPage--;

                pdfView.jumpTo(currentPage, true);

            }

        });

        // Next button

        btnNext.setOnClickListener(v -> {

            if (currentPage < pdfView.getPageCount() - 1) {

                currentPage++;

                pdfView.jumpTo(currentPage, true);

            }

        });

    }

}

How It Works

1. The PDFView component from the Barteksc library is used to display PDF files.

2. Buttons allow navigation between pages.

3. The PDF is loaded from the assets folder.

Additional Features

Zoom Functionality: The library supports pinch-to-zoom. Add explicit zoom controls if needed.

Search: Implement a search feature to allow users to find text within the PDF.

Permissions: Use runtime permissions to access external storage if you need to load PDFs from the device.

This example provides a basic setup for building a PDF viewer in Android Studio using Java. You can further customize the design and functionality as needed!

buy source code ZIP file