آموزش ساخت فایل PDF در اندروید با زبان جاوا

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
    <!--Button for generating the PDF file-->
    <Button
        android:id="@+id/idBtnGeneratePDF"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Generate PDF" />
     
</RelativeLayout>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

public class MainActivity extends AppCompatActivity {
 
    // variables for our buttons.
    Button generatePDFbtn;
     
    // declaring width and height
    // for our PDF file.
    int pageHeight = 1120;
    int pagewidth = 792;
     
    // creating a bitmap variable
    // for storing our images
    Bitmap bmp, scaledbmp;
     
    // constant code for runtime permissions
    private static final int PERMISSION_REQUEST_CODE = 200;
     
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         
        // initializing our variables.
        generatePDFbtn = findViewById(R.id.idBtnGeneratePDF);
        bmp = BitmapFactory.decodeResource(getResources(), R.drawable.gfgimage);
        scaledbmp = Bitmap.createScaledBitmap(bmp, 140, 140, false);
 
        // below code is used for
          // checking our permissions.
        if (checkPermission()) {
            Toast.makeText(this, "Permission Granted", Toast.LENGTH_SHORT).show();
        } else {
            requestPermission();
        }
 
        generatePDFbtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // calling method to
                  // generate our PDF file.
                generatePDF();
            }
        });
    }
 
    private void generatePDF() {
        // creating an object variable
        // for our PDF document.
        PdfDocument pdfDocument = new PdfDocument();
         
        // two variables for paint "paint" is used
        // for drawing shapes and we will use "title"
        // for adding text in our PDF file.
        Paint paint = new Paint();
        Paint title = new Paint();
         
        // we are adding page info to our PDF file
        // in which we will be passing our pageWidth,
        // pageHeight and number of pages and after that
        // we are calling it to create our PDF.
        PdfDocument.PageInfo mypageInfo = new PdfDocument.PageInfo.Builder(pagewidth, pageHeight, 1).create();
         
        // below line is used for setting
        // start page for our PDF file.
        PdfDocument.Page myPage = pdfDocument.startPage(mypageInfo);
         
        // creating a variable for canvas
        // from our page of PDF.
        Canvas canvas = myPage.getCanvas();
         
        // below line is used to draw our image on our PDF file.
        // the first parameter of our drawbitmap method is
        // our bitmap
        // second parameter is position from left
        // third parameter is position from top and last
        // one is our variable for paint.
        canvas.drawBitmap(scaledbmp, 56, 40, paint);
 
        // below line is used for adding typeface for
        // our text which we will be adding in our PDF file.
        title.setTypeface(Typeface.create(Typeface.DEFAULT, Typeface.NORMAL));
         
        // below line is used for setting text size
        // which we will be displaying in our PDF file.
        title.setTextSize(15);
         
        // below line is sued for setting color
        // of our text inside our PDF file.
        title.setColor(ContextCompat.getColor(this, R.color.purple_200));
         
        // below line is used to draw text in our PDF file.
        // the first parameter is our text, second parameter
        // is position from start, third parameter is position from top
        // and then we are passing our variable of paint which is title.
        canvas.drawText("A portal for IT professionals.", 209, 100, title);
        canvas.drawText("Geeks for Geeks", 209, 80, title);
 
        // similarly we are creating another text and in this
        // we are aligning this text to center of our PDF file.
        title.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL));
        title.setColor(ContextCompat.getColor(this, R.color.purple_200));
        title.setTextSize(15);
         
        // below line is used for setting
        // our text to center of PDF.
        title.setTextAlign(Paint.Align.CENTER);
        canvas.drawText("This is sample document which we have created.", 396, 560, title);
 
        // after adding all attributes to our
        // PDF file we will be finishing our page.
        pdfDocument.finishPage(myPage);
         
        // below line is used to set the name of
        // our PDF file and its path.
        File file = new File(Environment.getExternalStorageDirectory(), "GFG.pdf");
 
        try {
            // after creating a file name we will
            // write our PDF file to that location.
            pdfDocument.writeTo(new FileOutputStream(file));
             
            // below line is to print toast message
            // on completion of PDF generation.
            Toast.makeText(MainActivity.this, "PDF file generated successfully.", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            // below line is used
            // to handle error
            e.printStackTrace();
        }
        // after storing our pdf to that
        // location we are closing our PDF file.
        pdfDocument.close();
    }
 
    private boolean checkPermission() {
        // checking of permissions.
        int permission1 = ContextCompat.checkSelfPermission(getApplicationContext(), WRITE_EXTERNAL_STORAGE);
        int permission2 = ContextCompat.checkSelfPermission(getApplicationContext(), READ_EXTERNAL_STORAGE);
        return permission1 == PackageManager.PERMISSION_GRANTED && permission2 == PackageManager.PERMISSION_GRANTED;
    }
 
    private void requestPermission() {
        // requesting permissions if not provided.
        ActivityCompat.requestPermissions(this, new String[]{WRITE_EXTERNAL_STORAGE, READ_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
    }
 
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0) {
                 
                // after requesting permissions we are showing
                // users a toast message of permission granted.
                boolean writeStorage = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                boolean readStorage = grantResults[1] == PackageManager.PERMISSION_GRANTED;
 
                if (writeStorage && readStorage) {
                    Toast.makeText(this, "Permission Granted..", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(this, "Permission Denined.", Toast.LENGTH_SHORT).show();
                    finish();
                }
            }
        }
    }
}