Develop Reference

Android create PDF from expandable List View content

I was using RecyclerView to create PDF previously. I want to add share and print functionality for which I want to create PDF with content in it. The method I was using was
public static void generatePDF(RecyclerView view, boolean isShareTrue, Context context, boolean isWeekly) {
RecyclerView.Adapter adapter = view.getAdapter();
Bitmap bigBitmap = null;
if (adapter != null) {
int size = adapter.getItemCount();
int height = 0;
Paint paint = new Paint();
int iHeight = 0;
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;
LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
for (int i = 0; i < size; i++) {
RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
adapter.onBindViewHolder(holder, i);
holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
Bitmap drawingCache = holder.itemView.getDrawingCache();
if (drawingCache != null) {
bitmaCache.put(String.valueOf(i), drawingCache);
}
height += holder.itemView.getMeasuredHeight();
}
bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
bigCanvas.drawColor(Color.WHITE);
Document document = new Document(PageSize.A4);
File file;
if (isWeekly)
file = new File(Environment.getExternalStorageDirectory(), "Weekly_list_" + AppPreferences.INSTANCE.getUserId() + ".pdf");
else
file = new File(Environment.getExternalStorageDirectory(), "Open_Cycle_List_" + AppPreferences.INSTANCE.getUserId() + ".pdf");
try {
PdfWriter.getInstance(document, new FileOutputStream(file));
} catch (DocumentException | FileNotFoundException e) {
e.printStackTrace();
}
for (int i = 0; i < size; i++) {
try {
//Adding the content to the document
Bitmap bmp = bitmaCache.get(String.valueOf(i));
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
Image image = Image.getInstance(stream.toByteArray());
float scaler = ((document.getPageSize().getWidth() - document.leftMargin()
- document.rightMargin() - 0) / image.getWidth()) * 100; // 0 means you have no indentation. If you have any, change it.
image.scalePercent(scaler);
image.setAlignment(com.itextpdf.text.Image.ALIGN_CENTER | com.itextpdf.text.Image.ALIGN_TOP);
if (!document.isOpen()) {
document.open();
}
document.add(image);
} catch (Exception ex) {
Log.e("TAG-ORDER PRINT ERROR", ex.getMessage());
}
}
if (document.isOpen()) {
document.close();
}
if (isShareTrue) {
Intent intentShareFile = new Intent(Intent.ACTION_SEND);
if (file.exists()) {
Uri pdfUri;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
pdfUri = FileProvider.getUriForFile(context, context.getPackageName() + ".provider", file);
} else {
pdfUri = Uri.fromFile(file);
}
intentShareFile.setType("application/pdf");
intentShareFile.putExtra(Intent.EXTRA_STREAM, pdfUri);
intentShareFile.putExtra(Intent.EXTRA_SUBJECT, "Sharing File...");
intentShareFile.putExtra(Intent.EXTRA_TEXT, "Sharing File...");
context.startActivity(Intent.createChooser(intentShareFile, "Share File"));
}
} else {
Toast.makeText(context, "PDF Generated successfully", Toast.LENGTH_LONG).show();
}
}
}
Now I have replaced recycler view with ExpandableListView and my print and share functionality is not working.
I want to create PDF with ExpandableListView content.

Listview to pdf in android

I have a custom listview and I want to make pdf from the whole listview. I refered many posts and implemented below code which converts my listview to pdf. But problem is its not containing the whole listview item. Only first few items are available in the pdf.
My function to convert listview to pdf is
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String state = Environment.getExternalStorageState();
if (!Environment.MEDIA_MOUNTED.equals(state)) {
}
File pdfDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOCUMENTS), "MyProject");
if (!pdfDir.exists()){
pdfDir.mkdir();
}
Bitmap screen = getWholeListViewItemsToBitmap();
File pdfFile = new File(pdfDir, "myPdfFile_new.pdf");
try {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(pdfFile));
document.open();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
screen.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
addImage(document,byteArray);
document.close();
}
catch (Exception e){
e.printStackTrace();
}
}
});
addImage method
private static void addImage(Document document,byte[] byteArray)
{
Image image = null;
try
{
image = Image.getInstance(byteArray);
}
catch (BadElementException e)
{
e.printStackTrace();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
try
{
document.add(image);
} catch (DocumentException e) {
e.printStackTrace();
}
}
method to get list items
public Bitmap getWholeListViewItemsToBitmap() {
ListView listview = StockReportActivity.category_list;
ListAdapter adapter = listview.getAdapter();
int itemscount = adapter.getCount();
int allitemsheight = 0;
List<Bitmap> bmps = new ArrayList<Bitmap>();
for (int i = 0; i < itemscount; i++) {
View childView = adapter.getView(i, null, listview);
childView.measure(View.MeasureSpec.makeMeasureSpec(listview.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
childView.setDrawingCacheEnabled(true);
childView.buildDrawingCache();
bmps.add(childView.getDrawingCache());
allitemsheight+=childView.getMeasuredHeight();
}
Bitmap bigbitmap = Bitmap.createBitmap(listview.getMeasuredWidth(), allitemsheight, Bitmap.Config.ARGB_8888);
Canvas bigcanvas = new Canvas(bigbitmap);
Paint paint = new Paint();
int iHeight = 0;
for (int i = 0; i < bmps.size(); i++) {
Bitmap bmp = bmps.get(i);
bigcanvas.drawBitmap(bmp, 0, iHeight, paint);
iHeight+=bmp.getHeight();
bmp.recycle();
bmp=null;
}
return bigbitmap;
}
My listview contains large number of items in it, so how can i convert the whole listview to pdf. All your suggestions are appreciated

You can get the number of items displayed on screen in recyclerView, so create bitmap for first set of views, after that you can dynamically scroll to item below the last item displayed (i.e noOfItemDisplayed+1), again get bitmap, likewise all get all bitmaps into ArrayList<Bitmap> from which you can create pdf file, refer to code below to create pdf from arraylist of bitmaps:
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void createPdf() throws IOException {
PdfDocument document = new PdfDocument();
PdfDocument.Page page = null;
// crate a page description
for (int i = 0; i < bitmaps.size(); i++) {
Bitmap bitmap = bitmaps.get(i);
PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(1400, 1979, i).create();
// start a page
page = document.startPage(pageInfo);
if (page == null) {
return;
}
Canvas canvas = page.getCanvas();
canvas.drawBitmap(bitmap, 0, 0, null);
document.finishPage(page);
}
// finish the page
// write the document content
fileHandler = new FileHandler(this, getString(R.string.app_name));
File pdf = fileHandler.getNewFileToWrite(AppConstants.FileExtensions.PDF); //crete and get file
try {
document.writeTo(new FileOutputStream(pdf));
} catch (IOException e) {
logger.error(e);
}
// close the document
document.close();
}

Now you can create a Bitmap for all childviews in the ListView.
After that, please process Bitmap as you like.
public List<Bitmap> getWholeListViewItemsToBitmap(ListView lv, Adapter adapter) {
List<Bitmap> listBitmap = new ArrayList<Bitmap>();
int itemsCount = adapter.getCount();
int lvViewLines = lv.getChildCount();
for(int from = 0; from < itemsCount; from+= lvViewLines) {
int to = from + lvViewLines;
for(int i = from; i < to && i < itemsCount; i++) {
View childView = adapter.getView(i, null, lv);
childView.measure(View.MeasureSpec.makeMeasureSpec(lv.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
childView.setDrawingCacheEnabled(true);
childView.buildDrawingCache();
listBitmap.add(childView.getDrawingCache());
}
lv.setScrollY(lvViewLines);
}
return listBitmap;
}

How to capture invisible content of Tab and Recyclerview in Android?

I have a layout which contain TabLayout and ViewPager, I have 3 tab.layout code is look like
<android.support.v4.widget.NestedScrollView
android:id="#+id/nest_scrollview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
android:background="#color/tab_background"
app:tabIndicatorColor="#color/colorPrimary" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
now I would like to take screen shot, it should take all tab and it's contain.
I used below code for take screen shot, but it's only take visible part on screen.
public Bitmap takeScreenshot() {
View rootView = findViewById(android.R.id.content).getRootView();
rootView.setDrawingCacheEnabled(true);
return rootView.getDrawingCache();
}
public void saveBitmap(Bitmap bitmap) {
imagePath = new File(Environment.getExternalStorageDirectory() + "/screenshot.png");
FileOutputStream fos;
try {
fos = new FileOutputStream(imagePath);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
Log.e("GREC", e.getMessage(), e);
} catch (IOException e) {
Log.e("GREC", e.getMessage(), e);
}
}

You can capture entire recyclerview using below code.
public class Utils {
public Utils() {
}
public Bitmap getScreenshotFromRecyclerView(RecyclerView view) {
Bitmap bigBitmap = null;
RecyclerView.Adapter adapter = view.getAdapter();
if (adapter != null) {
int size = adapter.getItemCount();
int height = 0;
Paint paint = new Paint();
int iHeight = 0;
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory / 8;
LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
for (int i = 0; i < size; i++) {
RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
adapter.onBindViewHolder(holder, i);
holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
holder.itemView.setDrawingCacheEnabled(true);
holder.itemView.buildDrawingCache();
Bitmap drawingCache = holder.itemView.getDrawingCache();
if (drawingCache != null) {
bitmaCache.put(String.valueOf(i), drawingCache);
}
// holder.itemView.setDrawingCacheEnabled(false);
// holder.itemView.destroyDrawingCache();
height += holder.itemView.getMeasuredHeight();
}
bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
Canvas bigCanvas = new Canvas(bigBitmap);
bigCanvas.drawColor(Color.WHITE);
for (int i = 0; i < size; i++) {
Bitmap bitmap = bitmaCache.get(String.valueOf(i));
bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
iHeight += bitmap.getHeight();
bitmap.recycle();
}
}
storeImage(bigBitmap, "myRecipeTest.jpg");
return bigBitmap;
}
/**
* Convert the bitmap into image and save it into the sdcard.
*
* #param imageData -Bitmap image.
* #param filename -Name of the image.
* #return
*/
public boolean storeImage(Bitmap imageData, String filename) {
// get path to external storage (SD card)
File sdIconStorageDir = new File(Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/myAppDir/");
// create storage directories, if they don't exist
sdIconStorageDir.mkdirs();
try {
String filePath = sdIconStorageDir.toString() + File.separator + filename;
FileOutputStream fileOutputStream = new FileOutputStream(filePath);
BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
Log.e("<== SHARE ==>", "storeImage: Image Saved at----" + filePath);
// choose another format if PNG doesn't suit you
imageData.compress(Bitmap.CompressFormat.PNG, 100, bos);
bos.flush();
bos.close();
} catch (FileNotFoundException e) {
Log.w("TAG", "Error saving image file: " + e.getMessage());
return false;
} catch (IOException e) {
Log.w("TAG", "Error saving image file: " + e.getMessage());
return false;
}
return true;
}
}

Accessing Full Frame Using ZXing on Android

We are developing an Android application and using ZXing for scanning QR codes. Is there a way to get full frame of decoded QR code using ZXing ?
Following method is added to PlanarYUVLuminanceSource class.
public void saveFrame() {
try {
YuvImage image = new YuvImage(yuvData, ImageFormat.NV21, getWidth(), getHeight(), null);
File file = new File(Environment.getExternalStorageDirectory().getPath() + "/frame.jpeg");
FileOutputStream fos = new FileOutputStream(file);
image.compressToJpeg(new Rect(0, 0, image.getWidth(), image.getHeight()), 100, fos);
} catch (FileNotFoundException e) {
Log.e(TAG, "FileNotFoundException!");
}
}
Called within DecodeHandler class as below,
private void decode(byte[] data, int width, int height) {
long start = System.currentTimeMillis();
Result rawResult = null;
PlanarYUVLuminanceSource source = CameraManager.get()
.buildLuminanceSource(data, width, height);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
rawResult = multiFormatReader.decodeWithState(bitmap);
} catch (ReaderException re) {
// continue
} finally {
multiFormatReader.reset();
}
if (rawResult != null) {
// Don't log the barcode contents for security.
long end = System.currentTimeMillis();
Log.d(TAG, "Found barcode in " + (end - start) + " ms");
Message message = Message.obtain(activity.getHandler(),
R.id.zxinglib_decode_succeeded, rawResult);
Bundle bundle = new Bundle();
bundle.putParcelable(DecodeThread.BARCODE_BITMAP,
source.renderCroppedGreyscaleBitmap());
source.saveFrame();
message.setData(bundle);
message.sendToTarget();
} else {
Message message = Message.obtain(activity.getHandler(),
R.id.zxinglib_decode_failed);
message.sendToTarget();
}
}
Here is result image,

Finally I found a solution. It is based on renderCroppedGreyscaleBitmap() method of PlanarYUVLuminanceSource class. Here is how I changed decode() method.
private void decode(byte[] data, int width, int height) {
long start = System.currentTimeMillis();
Result rawResult = null;
PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
try {
rawResult = multiFormatReader.decodeWithState(bitmap);
} catch (ReaderException re) {
// continue
} finally {
multiFormatReader.reset();
}
if (rawResult != null) {
// Don't log the barcode contents for security.
long end = System.currentTimeMillis();
Log.d(TAG, "Found barcode in " + (end - start) + " ms");
// Grab & save frame
Bitmap wholeBmp = renderGrayScaleBitmap(data, width, height);
if(wholeBmp != null)
saveBitmap(wholeBmp, "frame.png");
else
Log.e(TAG, "Bitmap of frame is empty!");
Message message = Message.obtain(activity.getHandler(), R.id.zxinglib_decode_succeeded, rawResult);
Bundle bundle = new Bundle();
bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
message.setData(bundle);
message.sendToTarget();
} else {
Message message = Message.obtain(activity.getHandler(), R.id.zxinglib_decode_failed);
message.sendToTarget();
}
}
Create bitmap from decode data
private Bitmap renderGrayScaleBitmap(byte[] data, int width, int height) {
int[] pixels = new int[width * height];
int inputOffset = width;
for (int y = 0; y < height; y++) {
int outputOffset = y * width;
for (int x = 0; x < width; x++) {
int grey = data[inputOffset + x] & 0xff;
pixels[outputOffset + x] = 0xFF000000 | (grey * 0x00010101);
}
inputOffset += width;
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
Save bitmap to sdcard
private void saveBitmap(Bitmap bmp, String name) {
FileOutputStream out = null;
try {
String filename = Environment.getExternalStorageDirectory().toString() + "/" + name;
Log.i(TAG, "writtenPath=" + filename);
out = new FileOutputStream(filename);
bmp.compress(Bitmap.CompressFormat.PNG, 100, out);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

Loading image from cache using BitmapFactory.decodeStream() in Android

UPDATES: Even if i don't retrieve images from cache, i tried to retrieve via Drawable where i stored all the 18 images in the "drawable-mdpi" folder. Still, a blank screen was display.
I was able to retrieved images from the server and save the image (.GIF) into the cache. However, when i need to load that image from cache, the image doesn't show up on screen. Here is the codes that does the work:
File cacheDir = context.getCacheDir();
File cacheMap = new File(cacheDir, smallMapImageNames.get(i).toString());
if(cacheMap.exists()){
FileInputStream fis = null;
try {
fis = new FileInputStream(cacheMap);
Bitmap local = BitmapFactory.decodeStream(fis);
puzzle.add(local);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}else{
Drawable smallMap = LoadImageFromWebOperations(mapPiecesURL.get(i).toString());
if(i==0){
height1 = smallMap.getIntrinsicHeight();
width1 = smallMap.getIntrinsicWidth();
}
if (smallMap instanceof BitmapDrawable) {
Bitmap bitmap = ((BitmapDrawable)smallMap).getBitmap();
FileOutputStream fos = null;
try {
cacheMap.createNewFile();
fos = new FileOutputStream(cacheMap);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.flush();
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
puzzle.add(bitmap);
}
}
ArrayList to store the image names: smallMapImageNames (The image names can also be found in the URL)
ArrayList to store the URL of the images: mapPiecesURL
To sum it up i have 2 questions
1) how to load images from cache?
2) regarding the bitmap.compress(), the images from the server is .GIF format but i apply Bitmap.CompressFormat.PNG. So is there going to be any problem with this?
Can anyone please help me with this?
The two functions
private Bitmap getBitMap(Context context) {
// TODO Auto-generated method stub
WifiPositioningServices wifiPositioningServices = new WifiPositioningServices();
String[] mapURLandCalibratedPoint1 = wifiPositioningServices.GetMapURLandCalibratedPoint("ERLab-1_1.GIF","ERLab"); //list of map pieces url in the first 9 pieces
String[] mapURLandCalibratedPoint2 = wifiPositioningServices.GetMapURLandCalibratedPoint("ERLab-4_1.GIF","ERLab"); //list of map pieces url in the last 9 pieces
ArrayList<String> smallMapImageNames = new ArrayList<String>();
ArrayList<String> mapPiecesURL = new ArrayList<String>();
for(int i=0; i<mapURLandCalibratedPoint1.length; i++){
if(mapURLandCalibratedPoint1[i].length()>40){ //image url
int len = mapURLandCalibratedPoint1[i].length();
int subStrLen = len-13;
smallMapImageNames.add(mapURLandCalibratedPoint1[i].substring(subStrLen, len-3)+"JPEG");
mapPiecesURL.add(mapURLandCalibratedPoint1[i]);
}
else{
//perform other task
}
}
for(int i=0; i<mapURLandCalibratedPoint2.length; i++){
if(mapURLandCalibratedPoint2[i].length()>40){ //image url
int len = mapURLandCalibratedPoint2[i].length();
int subStrLen = len-13;
smallMapImageNames.add(mapURLandCalibratedPoint2[i].substring(subStrLen, len-3)+"JPEG");
mapPiecesURL.add(mapURLandCalibratedPoint2[i]);
}
else{
//perform other task
}
}
Bitmap result = Bitmap.createBitmap(1029, 617, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
ArrayList<Bitmap> puzzle = new ArrayList<Bitmap>();
int height1 = 0 ;
int width1 = 0;
File cacheDir = context.getCacheDir();
for(int i=0; i<18; i++){
File cacheMap = new File(cacheDir, smallMapImageNames.get(i).toString());
if(cacheMap.exists()){
//retrieved from cached
try {
FileInputStream fis = new FileInputStream(cacheMap);
Bitmap bitmap = BitmapFactory.decodeStream(fis);
puzzle.add(bitmap);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else{
//retrieve from server and cached it
Drawable smallMap = LoadImageFromWebOperations(mapPiecesURL.get(i).toString());
if(i==0){
height1 = smallMap.getIntrinsicHeight();
width1 = smallMap.getIntrinsicWidth();
}
if (smallMap instanceof BitmapDrawable) {
Bitmap bitmap = ((BitmapDrawable)smallMap).getBitmap();
FileOutputStream fos = null;
try {
cacheMap.createNewFile();
fos = new FileOutputStream(cacheMap);
bitmap.compress(CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
puzzle.add(bitmap);
}
}
}
Rect srcRect;
Rect dstRect;
int cnt =0;
for (int j = 0; j < 3; j++) {
int newHeight = height1 * (j % 3);
for (int k = 0; k < 3; k++) {
if (j == 0 && k == 0) {
srcRect = new Rect(0, 0, width1, height1);
dstRect = new Rect(srcRect);
} else {
int newWidth = width1 * k;
srcRect = new Rect(0, 0, width1, height1);
dstRect = new Rect(srcRect);
dstRect.offset(newWidth, newHeight);
}
canvas.drawBitmap(puzzle.get(cnt), srcRect, dstRect,null);
cnt++;
}
}
for(int a=0; a<3; a++){
int newHeight = height1 * (a % 3);
for (int k = 3; k < 6; k++) {
if (a == 0 && k == 0) {
srcRect = new Rect(0, 0, width1*3, height1);
dstRect = new Rect(srcRect);
} else {
int newWidth = width1 * k;
srcRect = new Rect(0, 0, width1, height1);
dstRect = new Rect(srcRect);
dstRect.offset(newWidth, newHeight);
}
canvas.drawBitmap(puzzle.get(cnt), srcRect, dstRect,
null);
cnt++;
}
}
return result;
}
private Drawable LoadImageFromWebOperations(String url) {
// TODO Auto-generated method stub
try
{
InputStream is = (InputStream) new URL(url).getContent();
Drawable d = Drawable.createFromStream(is, "src name");
return d;
}catch (Exception e) {
System.out.println("Exc="+e);
return null;
}
}
I am actually trying to display 18 pieces (3X6) of images to form up a floorplan. So to display the images, i use two for-loop to display it. the two .GIF images, ERLab-1_1.GIF and ERLab-4_1.GIF are the center piece of each group. For example, the first row of would be ERLab-0_0.GIF, ERLab-1_0.GIF, ERLab-2_0.GIF, ERLab-3_0.GIF, ERLab-4_0.GIF, ERLab-5_0.GIF. Second row would be XXX-X_1.GIF and XXX-X_2.GIF for the third row.
Lastly,
Bitmap resultMap = getBitMap(this.getContext());
bmLargeImage = Bitmap.createBitmap(1029 , 617, Bitmap.Config.ARGB_8888);
bmLargeImage = resultMap;
Then in the onDraw function would be drawing the image onto the canvas.

I just solved my own question.
In this line, canvas.drawBitmap(puzzle.get(cnt), srcRect, dstRect,null); within each of the for-loop which i am using it to draw the bitmap onto the canvas, i need to cast the each item in the ArrayList (puzzle) to Bitmap. Only then will the image get display.
I thought that if the ArrayList is definite as such, ArrayList<Bitmap> puzzle = new ArrayList<Bitmap>(); each items in the ArrayList would be of Bitmap type. But isn't that always true?