[Fixes #499] Add new feature - Converting PDF pages to images

app/src/main/java/swati4star/createpdf/activity/MainActivity.java

@@ -31,6 +31,7 @@
 import swati4star.createpdf.fragment.HomeFragment;
 import swati4star.createpdf.fragment.ImageToPdfFragment;
 import swati4star.createpdf.fragment.MergeFilesFragment;
+import swati4star.createpdf.fragment.PdfToImageFragment;
 import swati4star.createpdf.fragment.QrBarcodeScanFragment;
 import swati4star.createpdf.fragment.RemovePagesFragment;
 import swati4star.createpdf.fragment.SettingsFragment;
@@ -307,6 +308,9 @@ public boolean onNavigationItemSelected(@NonNull MenuItem item) {
             case R.id.nav_extract_images:
                 fragment = new ExtractImagesFragment();
                 break;
+            case R.id.nav_pdf_to_images:
+                fragment = new PdfToImageFragment();
+                break;
             case R.id.nav_remove_pages:
                 fragment = new RemovePagesFragment();
                 bundle.putString(BUNDLE_DATA, REMOVE_PAGES);

app/src/main/java/swati4star/createpdf/fragment/HomeFragment.java

@@ -49,6 +49,8 @@ public class HomeFragment extends Fragment implements View.OnClickListener {
     MyCardView rearrangePages;
     @BindView(R.id.extract_images)
     MyCardView extractImages;
+    @BindView(R.id.pdf_to_images)
+    MyCardView mPdfToImages;
     @BindView(R.id.add_password)
     MyCardView addPassword;
     @BindView(R.id.remove_password)
@@ -72,6 +74,7 @@ public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
         removePages.setOnClickListener(this);
         rearrangePages.setOnClickListener(this);
         extractImages.setOnClickListener(this);
+        mPdfToImages.setOnClickListener(this);
         addPassword.setOnClickListener(this);
         removePassword.setOnClickListener(this);
         rotatePdf.setOnClickListener(this);
@@ -135,6 +138,10 @@ public void onClick(View v) {
                 fragment = new ExtractImagesFragment();
                 setNavigationViewSelection(10);
                 break;
+            case R.id.pdf_to_images:
+                fragment = new PdfToImageFragment();
+                setNavigationViewSelection(11);
+                break;
             case R.id.remove_pages:
                 fragment = new RemovePagesFragment();
                 bundle.putString(BUNDLE_DATA, REMOVE_PAGES);

app/src/main/java/swati4star/createpdf/fragment/PdfToImageFragment.java

@@ -0,0 +1,277 @@
+package swati4star.createpdf.fragment;
+
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.design.widget.BottomSheetBehavior;
+import android.support.v4.app.Fragment;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.RelativeLayout;
+import android.widget.TextView;
+
+import com.afollestad.materialdialogs.MaterialDialog;
+import com.airbnb.lottie.LottieAnimationView;
+import com.dd.morphingbutton.MorphingButton;
+
+import java.io.File;
+import java.util.ArrayList;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import butterknife.OnClick;
+import swati4star.createpdf.R;
+import swati4star.createpdf.activity.ImagesPreviewActivity;
+import swati4star.createpdf.adapter.ExtractImagesAdapter;
+import swati4star.createpdf.adapter.MergeFilesAdapter;
+import swati4star.createpdf.interfaces.BottomSheetPopulate;
+import swati4star.createpdf.interfaces.ExtractImagesListener;
+import swati4star.createpdf.util.BottomSheetCallback;
+import swati4star.createpdf.util.BottomSheetUtils;
+import swati4star.createpdf.util.FileUtils;
+import swati4star.createpdf.util.MorphButtonUtility;
+import swati4star.createpdf.util.PdfToImages;
+import swati4star.createpdf.util.ViewFilesDividerItemDecoration;
+
+import static android.app.Activity.RESULT_OK;
+import static swati4star.createpdf.util.DialogUtils.createAnimationDialog;
+import static swati4star.createpdf.util.FileUriUtils.getFilePath;
+import static swati4star.createpdf.util.StringUtils.showSnackbar;
+
+public class PdfToImageFragment extends Fragment implements BottomSheetPopulate, MergeFilesAdapter.OnClickListener,
+        ExtractImagesListener, ExtractImagesAdapter.OnFileItemClickedListener {
+
+    private static final int INTENT_REQUEST_PICKFILE_CODE = 10;
+    private Activity mActivity;
+    private String mPath;
+    private Uri mUri;
+    private MorphButtonUtility mMorphButtonUtility;
+    private FileUtils mFileUtils;
+    private BottomSheetBehavior mSheetBehavior;
+    private BottomSheetUtils mBottomSheetUtils;
+    private ArrayList<String> mOutputFilePaths;
+    private MaterialDialog mMaterialDialog;
+
+    @BindView(R.id.lottie_progress)
+    LottieAnimationView mLottieProgress;
+    @BindView(R.id.bottom_sheet)
+    LinearLayout mLayoutBottomSheet;
+    @BindView(R.id.upArrow)
+    ImageView mUpArrow;
+    @BindView(R.id.selectFile)
+    MorphingButton mSelectFileButton;
+    @BindView(R.id.createImages)
+    MorphingButton mCreateImagesButton;
+    @BindView(R.id.created_images)
+    RecyclerView mCreatedImages;
+    @BindView(R.id.pdfToImagesText)
+    TextView mCreateImagesSuccessText;
+    @BindView(R.id.options)
+    LinearLayout options;
+    @BindView(R.id.layout)
+    RelativeLayout mLayout;
+    @BindView(R.id.recyclerViewFiles)
+    RecyclerView mRecyclerViewFiles;
+
+    /**
+     * inflates the layout for the fragment
+     * @param inflater reference to inflater object
+     * @param container parent for the inflated view
+     * @param savedInstanceState bundle with saved data, if any
+     * @return inflated view
+     */
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View rootView = inflater.inflate(R.layout.fragment_pdf_to_image, container, false);
+        ButterKnife.bind(this, rootView);
+        mSheetBehavior = BottomSheetBehavior.from(mLayoutBottomSheet);
+        mSheetBehavior.setBottomSheetCallback(new BottomSheetCallback(mUpArrow, isAdded()));
+        mLottieProgress.setVisibility(View.VISIBLE);
+        mBottomSheetUtils.populateBottomSheetWithPDFs(this);
+        resetView();
+        return rootView;
+    }
+
+    /**
+     * called when user chooses to share generated images
+     */
+    @OnClick(R.id.shareImages)
+    void onShareFilesClick() {
+        if (mOutputFilePaths != null) {
+            ArrayList<File> fileArrayList = new ArrayList<>();
+            for (String path : mOutputFilePaths) {
+                fileArrayList.add(new File(path));
+            }
+            mFileUtils.shareMultipleFiles(fileArrayList);
+        }
+    }
+
+    /**
+     * called on click of bottom sheet
+     */
+    @OnClick(R.id.viewFiles)
+    void onViewFilesClick() {
+        mBottomSheetUtils.showHideSheet(mSheetBehavior);
+    }
+
+    /**
+     * called when user chooses to view generated images
+     */
+    @OnClick(R.id.viewImages)
+    void onViewImagesClicked() {
+        mActivity.startActivity(ImagesPreviewActivity.getStartIntent(mActivity, mOutputFilePaths));
+    }
+
+    /**
+     * invoked when user chooses to select a pdf file
+     * initiates an intent to pick a pdf file
+     */
+    @OnClick(R.id.selectFile)
+    public void showFileChooser() {
+        startActivityForResult(mFileUtils.getFileChooser(),
+                INTENT_REQUEST_PICKFILE_CODE);
+    }
+
+    /**
+     * receives intent response for selecting a pdf file
+     */
+    public void onActivityResult(int requestCode, int resultCode, Intent data) throws NullPointerException {
+        if (data == null || resultCode != RESULT_OK || data.getData() == null)
+            return;
+        if (requestCode == INTENT_REQUEST_PICKFILE_CODE) {
+            mUri = data.getData();
+            setTextAndActivateButtons(getFilePath(data.getData()));
+        }
+    }
+
+    /**
+     * invokes generation of images for pdf pages in the background
+     */
+    @OnClick(R.id.createImages)
+    public void parse() {
+        new PdfToImages(mPath, mUri, this).execute();
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        mActivity = (Activity) context;
+        mMorphButtonUtility = new MorphButtonUtility(mActivity);
+        mFileUtils = new FileUtils(mActivity);
+        mBottomSheetUtils = new BottomSheetUtils(mActivity);
+    }
+
+    /**
+     * handles choosing a file from bottom sheet list
+     * @param path path of the file on the device
+     */
+    @Override
+    public void onItemClick(String path) {
+        mUri = null;
+        mSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
+        setTextAndActivateButtons(path);
+    }
+
+    /**
+     * handles text and button states
+     * @param path path of the file on the device
+     */
+    private void setTextAndActivateButtons(String path) {
+        mCreatedImages.setVisibility(View.GONE);
+        options.setVisibility(View.GONE);
+        mCreateImagesSuccessText.setVisibility(View.GONE);
+        mPath = path;
+        mMorphButtonUtility.setTextAndActivateButtons(path,
+                mSelectFileButton, mCreateImagesButton);
+    }
+
+    /**
+     * handles opening a generated image for the given pdf
+     * @param path path of the file on the device
+     */
+    @Override
+    public void onFileItemClick(String path) {
+        mFileUtils.openImage(path);
+    }
+
+    /**
+     * initializes interactive views
+     */
+    @Override
+    public void resetView() {
+        mPath = null;
+        mMorphButtonUtility.initializeButton(mSelectFileButton, mCreateImagesButton);
+    }
+
+    /**
+     * displays progress indicator
+     */
+    @Override
+    public void extractionStarted() {
+        mMaterialDialog = createAnimationDialog(mActivity);
+        mMaterialDialog.show();
+    }
+
+    /**
+     * updates recycler view list items based with the generated images
+     * @param imageCount number of generated images
+     * @param outputFilePaths path for each generated image
+     */
+    @Override
+    public void updateView(int imageCount, ArrayList<String> outputFilePaths) {
+
+        mMaterialDialog.dismiss();
+        resetView();
+        if (imageCount == 0) {
+            showSnackbar(mActivity, R.string.extract_images_failed);
+            return;
+        }
+
+        String text = String.format(mActivity.getString(R.string.create_images_success), imageCount);
+        showSnackbar(mActivity, text);
+        mCreateImagesSuccessText.setVisibility(View.VISIBLE);
+        options.setVisibility(View.VISIBLE);
+        mOutputFilePaths = outputFilePaths;
+        ExtractImagesAdapter extractImagesAdapter = new ExtractImagesAdapter(mActivity, outputFilePaths, this);
+        // init recycler view for displaying generated image list
+        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(mActivity);
+        mCreateImagesSuccessText.setText(text);
+        mCreatedImages.setVisibility(View.VISIBLE);
+        mCreatedImages.setLayoutManager(mLayoutManager);
+        // set up adapter
+        mCreatedImages.setAdapter(extractImagesAdapter);
+        mCreatedImages.addItemDecoration(new ViewFilesDividerItemDecoration(mActivity));
+    }
+
+    /**
+     * populates bottom sheet list with pdf files
+     * @param paths paths for pdf files on the device
+     */
+    @Override
+    public void onPopulate(ArrayList<String> paths) {
+        if (paths == null || paths.size() == 0) {
+            mLayout.setVisibility(View.GONE);
+        } else {
+            // init recycler view for bottom sheet
+            mRecyclerViewFiles.setVisibility(View.VISIBLE);
+            MergeFilesAdapter mergeFilesAdapter = new MergeFilesAdapter(mActivity,
+                    paths, this);
+            RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(mActivity);
+            mRecyclerViewFiles.setLayoutManager(mLayoutManager);
+            // set up adapter
+            mRecyclerViewFiles.setAdapter(mergeFilesAdapter);
+            mRecyclerViewFiles.addItemDecoration(new ViewFilesDividerItemDecoration(mActivity));
+        }
+        mLottieProgress.setVisibility(View.GONE);
+    }
+}

app/src/main/java/swati4star/createpdf/util/FileUtils.java

@@ -315,7 +315,7 @@ public static String getFileDirectoryPath(String path) {
      * @param filename - name of the file
      * @param finalBitmap - bitmap to save
      */
-    static String saveImage(String filename, Bitmap finalBitmap) {
+    public static String saveImage(String filename, Bitmap finalBitmap) {
 
         if (checkIfBitmapIsWhite(finalBitmap))
             return null;