Convert image to PDF in Android

Download source code from here(Convert Image to pdf in android programattically)

MainActivity.java

package com.deepshikha.convertbitmap; import android.Manifest; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.pdf.PdfDocument; import android.net.Uri; import android.provider.MediaStore; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.DisplayMetrics; import android.util.Log; import android.view.Display; import android.view.View; import android.view.WindowManager; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; public class MainActivity extends AppCompatActivity implements View.OnClickListener { public static final int GALLERY_PICTURE = 1; Button btn_select, btn_convert; ImageView iv_image; boolean boolean_permission; boolean boolean_save; Bitmap bitmap; public static final int REQUEST_PERMISSIONS = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); listener(); fn_permission(); } private void init() { btn_select = (Button) findViewById(R.id.btn_select); btn_convert = (Button) findViewById(R.id.btn_convert); iv_image = (ImageView) findViewById(R.id.iv_image); } private void listener() { btn_select.setOnClickListener(this); btn_convert.setOnClickListener(this); } @Override public void onClick(View view) { switch (view.getId()) { case R.id.btn_select: Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, GALLERY_PICTURE); break; case R.id.btn_convert: if (boolean_save){ Intent intent1=new Intent(getApplicationContext(),PDFViewActivity.class); startActivity(intent1); }else { createPdf(); } break; } } private void createPdf(){ WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); Display display = wm.getDefaultDisplay(); DisplayMetrics displaymetrics = new DisplayMetrics(); this.getWindowManager().getDefaultDisplay().getMetrics(displaymetrics); float hight = displaymetrics.heightPixels ; float width = displaymetrics.widthPixels ; int convertHighet = (int) hight, convertWidth = (int) width; // Resources mResources = getResources(); // Bitmap bitmap = BitmapFactory.decodeResource(mResources, R.drawable.screenshot); PdfDocument document = new PdfDocument(); PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(bitmap.getWidth(), bitmap.getHeight(), 1).create(); PdfDocument.Page page = document.startPage(pageInfo); Canvas canvas = page.getCanvas(); Paint paint = new Paint(); paint.setColor(Color.parseColor("#ffffff")); canvas.drawPaint(paint); bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), true); paint.setColor(Color.BLUE); canvas.drawBitmap(bitmap, 0, 0 , null); document.finishPage(page); // write the document content String targetPdf = "/sdcard/test.pdf"; File filePath = new File(targetPdf); try { document.writeTo(new FileOutputStream(filePath)); btn_convert.setText("Check PDF"); boolean_save=true; } catch (IOException e) { e.printStackTrace(); Toast.makeText(this, "Something wrong: " + e.toString(), Toast.LENGTH_LONG).show(); } // close the document document.close(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == GALLERY_PICTURE && resultCode == RESULT_OK) { if (resultCode == RESULT_OK) { Uri selectedImage = data.getData(); String[] filePathColumn = {MediaStore.Images.Media.DATA}; Cursor cursor = getContentResolver().query( selectedImage, filePathColumn, null, null, null); cursor.moveToFirst(); int columnIndex = cursor.getColumnIndex(filePathColumn[0]); String filePath = cursor.getString(columnIndex); cursor.close(); bitmap = BitmapFactory.decodeFile(filePath); iv_image.setImageBitmap(bitmap); btn_convert.setClickable(true); } } } private void fn_permission() { if ((ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)|| (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) { if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, android.Manifest.permission.READ_EXTERNAL_STORAGE))) { } else { ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.READ_EXTERNAL_STORAGE}, REQUEST_PERMISSIONS); } if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE))) { } else { ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_PERMISSIONS); } } else { boolean_permission = true; } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode == REQUEST_PERMISSIONS) { if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { boolean_permission = true; } else { Toast.makeText(getApplicationContext(), "Please allow the permission", Toast.LENGTH_LONG).show(); } } } } 

Thanks!

A much simpler way.

Just pass context and list of file It will create a PDF file in cache dir Add your own logic to share/open PDF Works fast and reliable method

• No library needed (Uses android internal android.graphics.pdf.PdfDocument classes)
• Works in background, Doesn''t freeze UI
• No need to declare and grant storage permission :)

private static void createPdf(Context context,ArrayList<File> data){ File pdfFile = new File(context.getExternalCacheDir().getAbsolutePath() + File.separator + "TemperoryPDF_"+System.currentTimeMillis()+".pdf"); Toast.makeText(context, "Creating PDF,Please wait..", Toast.LENGTH_SHORT).show(); new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... voids) { PdfDocument document = new PdfDocument(); try { for(File item:data) { Bitmap bitmap = BitmapFactory.decodeFile(item.getAbsolutePath()); PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(bitmap.getWidth(), bitmap.getHeight(), 1).create(); PdfDocument.Page page = document.startPage(pageInfo); Canvas canvas = page.getCanvas(); Paint paint = new Paint(); paint.setColor(Color.parseColor("#ffffff")); canvas.drawPaint(paint); bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), true); canvas.drawBitmap(bitmap, 0, 0, null); document.finishPage(page); } document.writeTo(new FileOutputStream(pdfFile)); } catch (IOException e) { e.printStackTrace(); }finally { document.close(); } return null; } @Override protected void onPostExecute(Void unused) { super.onPostExecute(unused); if(pdfFile.exists() && pdfFile.length()>0) { FileUtil.openFile(context, pdfFile.getAbsolutePath()); // See: https://gist.github.com/omkar-tenkale/34d3aa1966653e6949d1ddaee1ba3355 }else { Toast.makeText(context, "Something went wrong creating the PDF :(", Toast.LENGTH_SHORT).show(); } } }.execute(); }