Java tutorial
package learn; /** * Created by Naseebah on 13/04/16. */ /* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.app.Activity; import android.app.AlertDialog; import android.app.Fragment; import android.app.ProgressDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.graphics.pdf.PdfRenderer; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.os.ParcelFileDescriptor; import android.util.Base64; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import com.firebase.client.DataSnapshot; import com.firebase.client.Firebase; import com.firebase.client.FirebaseError; import com.firebase.client.Query; import com.firebase.client.ValueEventListener; import com.itextpdf.text.DocumentException; import com.itextpdf.text.Image; import com.itextpdf.text.pdf.PdfContentByte; import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.PdfStamper; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; /** * This fragment has a big {@ImageView} that shows PDF pages, and 2 {@link android.widget.Button}s to move between * pages. We use a {@link android.graphics.pdf.PdfRenderer} to render PDF pages as {@link android.graphics.Bitmap}s. */ public class PdfRendererBasicFragment extends Fragment implements View.OnClickListener, View.OnTouchListener { public int counter = 0; /** * Key string for saving the state of current page index. */ private static final String STATE_CURRENT_PAGE_INDEX = "current_page_index"; /** * File descriptor of the PDF. */ private ParcelFileDescriptor mFileDescriptor; /** * {@link android.graphics.pdf.PdfRenderer} to render the PDF. */ private PdfRenderer mPdfRenderer; /** * Page that is currently shown on the screen. */ private PdfRenderer.Page mCurrentPage; /** * {@link android.widget.ImageView} that shows a PDF page as a {@link android.graphics.Bitmap} */ private ImageView mImageView; /** * {@link android.widget.Button} to move to the previous page. */ private Button mButtonPrevious; /** * {@link android.widget.Button} to move to the next page. */ private Button mButtonNext; /** * Button to share */ private Button mShare; /** * Button to select signature */ private Button mSelectSignature; /** * Button to sign Document */ private Button mSign; /** * signature image view */ private ImageView mSignatureImage; /** * file Document */ private File file; /** * progress dialog */ private ProgressDialog progress; /** * user signature */ public byte[] signatureByte; /** * temp path for new file */ public String newP = Environment.getExternalStorageDirectory().getAbsolutePath() + "/signon/l.pdf"; /** * file digest */ private String messagedigest; /** * file digest */ private String path; /** * stamp file */ private PdfReader pdfReader; /** * sign all button */ private Button mSignAll; public PdfRendererBasicFragment() { } @Override public void onResume() { super.onResume(); if (isBlankOrNull(session.base64)) { mSign.setEnabled(false); mSignAll.setEnabled(false); mSignatureImage.setVisibility(View.GONE); } changeImageView(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_pdf_render_basic, container, false); } @Override public void onViewCreated(final View view, Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); // Retain view references. mImageView = (ImageView) view.findViewById(R.id.image); mButtonPrevious = (Button) view.findViewById(R.id.previous); mButtonNext = (Button) view.findViewById(R.id.next); mShare = (Button) view.findViewById(R.id.share); mSelectSignature = (Button) view.findViewById(R.id.select); mSign = (Button) view.findViewById(R.id.sign); mSign.setEnabled(false); mSignatureImage = (ImageView) view.findViewById(R.id.signatureImage); mSignAll = (Button) view.findViewById(R.id.signall); mSignAll.setEnabled(false); changeImageView(); // Bind events. mButtonPrevious.setOnClickListener(this); mButtonNext.setOnClickListener(this); mImageView.setOnTouchListener(this); mShare.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent intent = new Intent(Intent.ACTION_SEND); intent.setType("application/pdf"); Uri uri = Uri.parse("file://" + file.getPath()); intent.putExtra(Intent.EXTRA_STREAM, uri); try { startActivity(Intent.createChooser(intent, "Share File")); } catch (Exception e) { Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_LONG).show(); } } }); mSelectSignature.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { //signature select Intent pickContactIntent = new Intent(getActivity(), SignatureSelectActivity.class); startActivity(pickContactIntent); } }); mSign.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { //signature final File test = new File(path); ////////////////check hash////////////////////////////// Firebase ref = new Firebase("https://torrid-heat-4458.firebaseio.com/documents/"); Query queryRef = ref.orderByKey().equalTo(session.docKey); System.out.println(session.docKey); ValueEventListener listener = new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { if (counter == 0) { if (dataSnapshot.exists()) { for (DataSnapshot child : dataSnapshot.getChildren()) { if (child.getKey().equals(session.docKey)) { messagedigest = child.child("messagedigest").getValue(String.class); System.out.println(messagedigest + " " + "message Di"); System.out.println("now " + SHA512.calculateSHA512(test)); if (SHA512.checkSHA512(messagedigest, test)) { merge(mCurrentPage.getIndex() + 1); File f2 = new File(newP); f2.renameTo(test); new HDWFTP_Upload_Update(getActivity()).execute(path); } else { AlertDialog alert = new AlertDialog.Builder(getActivity()) .setMessage("You Altered the file") .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // do nothing } }) .show(); } } break; } } counter++; } } @Override public void onCancelled(FirebaseError firebaseError) { } }; queryRef.addValueEventListener(listener); } }); mSignAll.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { //signature final File test = new File(path); ////////////////check hash////////////////////////////// Firebase ref = new Firebase("https://torrid-heat-4458.firebaseio.com/documents/"); Query queryRef = ref.orderByKey().equalTo(session.docKey); System.out.println(session.docKey); ValueEventListener listener = new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { if (counter == 0) { if (dataSnapshot.exists()) { for (DataSnapshot child : dataSnapshot.getChildren()) { if (child.getKey().equals(session.docKey)) { messagedigest = child.child("messagedigest").getValue(String.class); System.out.println(messagedigest + " " + "message Di"); System.out.println("now " + SHA512.calculateSHA512(test)); if (SHA512.checkSHA512(messagedigest, test)) { System.out.println("step 14: " + mSignatureImage.getX() + "," + mSignatureImage.getY()); merge(-1); File f2 = new File(newP); System.out.println("path " + f2.getPath()); f2.renameTo(test); new HDWFTP_Upload_Update(getActivity()).execute(path); } else { AlertDialog alert = new AlertDialog.Builder(getActivity()) .setMessage("You Altered the file") .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // do nothing } }) .show(); } } break; } } counter++; } } @Override public void onCancelled(FirebaseError firebaseError) { } }; queryRef.addValueEventListener(listener); } }); // Show the first page by default. int index = 0; // If there is a savedInstanceState (screen orientations, etc.), we restore the page index. if (null != savedInstanceState) { index = savedInstanceState.getInt(STATE_CURRENT_PAGE_INDEX, 0); } showPage(index); } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { openRenderer(activity); } catch (IOException e) { e.printStackTrace(); Toast.makeText(activity, "Error! " + e.getMessage(), Toast.LENGTH_SHORT).show(); activity.finish(); } } @Override public void onDetach() { try { closeRenderer(); } catch (IOException e) { e.printStackTrace(); } super.onDetach(); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); if (null != mCurrentPage) { outState.putInt(STATE_CURRENT_PAGE_INDEX, mCurrentPage.getIndex()); } } float x = 0.0f; float y = 0.0f; boolean moving = false; public static boolean isBlankOrNull(String str) { return (str == null || "".equals(str.trim())); } @Override public boolean onTouch(View v, MotionEvent event) { mImageView.getParent().requestDisallowInterceptTouchEvent(true); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: if (isBlankOrNull(session.base64)) { Toast.makeText(getActivity(), "Please select a signature", Toast.LENGTH_LONG).show(); mSignatureImage.setVisibility(View.GONE); mSign.setEnabled(false); mSignAll.setEnabled(false); } else { mSign.setEnabled(true); if (mPdfRenderer.getPageCount() > 1) mSignAll.setEnabled(true); mSignatureImage.setVisibility(ImageView.VISIBLE); } moving = true; break; case MotionEvent.ACTION_MOVE: if (moving) { x = event.getX(); y = event.getY(); mSignatureImage.setX(x); mSignatureImage.setY(y); } break; case MotionEvent.ACTION_UP: moving = false; break; } return true; } /** * Sets up a {@link android.graphics.pdf.PdfRenderer} and related resources. */ private void openRenderer(Context context) throws IOException { // In this sample, we read a PDF from the assets directory. // This is the PdfRenderer we use to render the PDF. Bundle extras = getActivity().getIntent().getExtras(); if (extras != null) { path = extras.getString("path"); file = new File(path); System.out.println(file.getAbsoluteFile()); mFileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY); System.out.println(mFileDescriptor.toString()); mPdfRenderer = new PdfRenderer(mFileDescriptor); } } /** * Closes the {@link android.graphics.pdf.PdfRenderer} and related resources. * * @throws java.io.IOException When the PDF file cannot be closed. */ private void closeRenderer() throws IOException { if (null != mCurrentPage) { mCurrentPage.close(); } mPdfRenderer.close(); mFileDescriptor.close(); } /** * Shows the specified page of PDF to the screen. * * @param index The page index. */ private void showPage(int index) { if (mPdfRenderer.getPageCount() <= index) { return; } // Make sure to close the current page before opening another one. if (null != mCurrentPage) { mCurrentPage.close(); } // Use `openPage` to open a specific page in PDF. mCurrentPage = mPdfRenderer.openPage(index); // Important: the destination bitmap must be ARGB (not RGB). Bitmap bitmap = Bitmap.createBitmap(mCurrentPage.getWidth(), mCurrentPage.getHeight(), Bitmap.Config.ARGB_8888); // Here, we render the page onto the Bitmap. // To render a portion of the page, use the second and third parameter. Pass nulls to get // the default result. // Pass either RENDER_MODE_FOR_DISPLAY or RENDER_MODE_FOR_PRINT for the last parameter. mCurrentPage.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY); // We are ready to show the Bitmap to user. mImageView.setImageBitmap(bitmap); updateUi(); } /** * Updates the state of 2 control buttons in response to the current page index. */ private void updateUi() { int index = mCurrentPage.getIndex(); int pageCount = mPdfRenderer.getPageCount(); mButtonPrevious.setEnabled(0 != index); mButtonNext.setEnabled(index + 1 < pageCount); getActivity().setTitle(getString(R.string.app_name_with_index, index + 1, pageCount)); } /** * Gets the number of pages in the PDF. This method is marked as public for testing. * * @return The number of pages. */ public int getPageCount() { return mPdfRenderer.getPageCount(); } @Override public void onClick(View view) { switch (view.getId()) { case R.id.previous: { // Move to the previous page showPage(mCurrentPage.getIndex() - 1); break; } case R.id.next: { // Move to the next page showPage(mCurrentPage.getIndex() + 1); break; } } } public void changeImageView() { Firebase ref = new Firebase("https://torrid-heat-4458.firebaseio.com/signature"); Query queryRef = ref.orderByChild("signerID").equalTo(session.userkey); ValueEventListener listener = new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { if (dataSnapshot.exists()) { for (DataSnapshot child : dataSnapshot.getChildren()) { if (child.getKey().equals(session.base64)) { signatureByte = Base64.decode(child.child("signatureBase64").getValue(String.class), Base64.NO_WRAP); Bitmap img = BitmapFactory.decodeByteArray(signatureByte, 0, signatureByte.length); mSignatureImage.setImageBitmap(img); } } } } @Override public void onCancelled(FirebaseError firebaseError) { } }; queryRef.addValueEventListener(listener); } public void merge(int pageNum) { try { Image image = Image.getInstance(signatureByte); pdfReader = new PdfReader(path); //fix y Matrix matrix = mSignatureImage.getImageMatrix(); // Get the values of the matrix float[] values = new float[9]; matrix.getValues(values); float relativeX = (mSignatureImage.getX() - values[2]) / values[0]; float relativeY = (mSignatureImage.getY() - values[5]) / values[4]; x = relativeX; y = relativeY; if (pageNum != -1) { y = pdfReader.getCropBox(pageNum).getHeight() - y; y -= mSign.getHeight(); } PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileOutputStream(newP)); if (pageNum == -1) { y = pdfReader.getCropBox(1).getHeight() - y; y -= mSign.getHeight(); for (int i = 1; i <= pdfReader.getNumberOfPages(); i++) { //put content under PdfContentByte content;// = pdfStamper.getUnderContent(i); // image.setAbsolutePosition(x, y); // content.addImage(image); //put content over content = pdfStamper.getOverContent(i); image.setAbsolutePosition(x, y); content.addImage(image); //Text over the existing page /*BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED); content.beginText(); content.setFontAndSize(bf, 18); content.showTextAligned(PdfContentByte.ALIGN_LEFT, "Page No: " + i, 430, 15, 0); content.endText();*/ } } else { PdfContentByte content = pdfStamper.getOverContent(pageNum); image.setAbsolutePosition(x, y); content.addImage(image); } pdfStamper.close(); } catch (Exception e) { e.printStackTrace(); } } }