Develop Reference

Can't show bitmap in ImageView

I try show a bitmap from the gallery. this is my URL
file:///storage/emulated/0/DCIM/Camera/IMG_20161103_180603.jpg
I know how to get bitmap using onActivityResult(), but I don't know how to get a bitmap
this is my source
final ImageView imageView=(ImageView)findViewById(R.id.imageView);
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
final Bitmap bitmap = BitmapFactory.decodeFile("file:///storage/emulated/0/DCIM/Camera/IMG_20161103_180603.jpg", options);
runOnUiThread(new Runnable() {
#Override
public void run() {
imageView.setImageBitmap(bitmap);
}
});
How can I solve my problem?

please refer below code
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
//Get our saved file into a bitmap object:
File file = new File(Environment.getExternalStorageDirectory()+File.separator + "DCIM"+ File.separator + "Camera "+File.separator + "IMG_20161103_180603.jpg");
Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
imageView.setImageBitmap(bitmap);

I had the same problem caused by large image size which couldn't be processed at run time. Solved it using this.
// Decodes image and scales it to reduce memory consumption
public static Bitmap decodeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 200;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE &&
o.outHeight / scale / 2 >= REQUIRED_SIZE) {
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return null;
}
where File f will be retrieved using https://stackoverflow.com/a/20559418/3758972
just put the size of thumbnail you want (typically the size of your imageview) in REQUIRED_SIZE and you are done. It will give you a scaled image which you can set to your imageview.

decodeFile( "file:///storage/emulated/0/DCIM/Camera/IMG_20161103_180603.jpg
Change to:
decodeFile( "/storage/emulated/0/DCIM/Camera/IMG_20161103_180603.jpg

NullPointerException rescaling bitmap from file Android

I'm facing this problem since a month with no solution:
I need to convert a file into a bitmap and rescaling it.
I'm using the following method, taken from android guide: Loading Large Bitmaps Efficiently
public Bitmap decodeSampledBitmapFromFile(String path, int reqSize) {
// First decode with inJustDecodeBounds=true to check dimensions
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
options.inMutable = true;
BitmapFactory.decodeFile(path, options);
// Calculate inSampleSize
double ratio = (double) options.outHeight / options.outWidth;
boolean portrait = true;
if (ratio < 1) {
portrait = false;
}
double floatSampleSize = options.outHeight / (double)reqSize;
options.inSampleSize = (int) Math.floor(floatSampleSize);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
Bitmap resultBitmap = BitmapFactory.decodeFile(path, options);
if(floatSampleSize % options.inSampleSize != 0){
if(portrait) {
resultBitmap = Bitmap.createScaledBitmap(resultBitmap, (int)(reqSize/ratio), reqSize, true);
} else {
resultBitmap = Bitmap.createScaledBitmap(resultBitmap, reqSize, (int)(ratio*reqSize), true);
}
}
return resultBitmap;
}
I've got the same NullPointerException but i can't reproduce it:
NullPointerException (#Utilities:decodeSampledBitmapFromFile:397) {AsyncTask #2}
NullPointerException (#Utilities:decodeSampledBitmapFromFile:399) {AsyncTask #3}
lines 397 and 399 are:
resultBitmap = Bitmap.createScaledBitmap(resultBitmap, (int)(reqSize/ratio), reqSize, true);
resultBitmap = Bitmap.createScaledBitmap(resultBitmap, reqSize, (int)(ratio*reqSize), true);
in this device models:
ST21a
U9500
M7
U8950-1
GT-I9305
Someone can help me to solve this?
is BitmapFactory.decodeFile returns null?
thank you so much

Try this hope works for you
public Bitmap decodeFile(String path, int reqSize) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, o);
// The new size we want to scale to
final int REQUIRED_SIZE = reqSize;
// Find the correct scale value. It should be the power of 2.
int scale = 1;
while (o.outWidth / scale / 2 >= REQUIRED_SIZE && o.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeFile(path, o2);
} catch (Throwable e) {
e.printStackTrace();
}
return null;
}

How to put image to PDF using iText without losing image quality?

I am using this code:
Bitmap itemImage = reduceImageAtFilePathFromGallery(imageName);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
itemImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
imageAnswer = Image.getInstance(stream.toByteArray());
private Bitmap reduceImageAtFilePathFromGallery(String filePath) {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 256;
// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp < REQUIRED_SIZE && height_tmp < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
Bitmap bitmap = BitmapFactory.decodeFile(filePath, o2);
return bitmap;
}
But the image's quality becomes bad.
Then, I also tried below code:
Image imageAnswer = getAndResizeImage(imageName);
private Image getAndResizeImage(String imageFilename){
final File imageFile = new File(imageFilename);
if (imageFile.exists()) {
Bitmap b = null;
try {
File f = new File(imageFilename);
b = BitmapFactory.decodeFile(f.getAbsolutePath());
//calculate how many bytes our image consists of.
int bytes = getSizeInBytes(b);
ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer
b.copyPixelsToBuffer(buffer); //Move the byte data to the buffer
byte[] array = buffer.array(); //Get the underlying array containing the data.
Image image = Image.getInstance(array);
return image;
} catch (Exception e) {
e.printStackTrace();
return null;
}
return null;
}
and it gives this error:
09-09 15:08:58.368: W/S
ystem.err(1385): java.io.IOException: The byte array is not a
recognized imageformat. 09-09 15:08:58.378: W/System.err(1385): at
com.itextpdf.text.Image.getInstance(Image.java:442) 09-09
on this line of code:
Image image = Image.getInstance(array);
Is there any way I can have good quality of image on PDF using iText?

Use JPEG compress format rather PNG
itemImage.compress(Bitmap.CompressFormat.JPEG, 100, stream);

Out of Memory Error Bitmap With ImageView In Android 4.0 and Above

I am Getting error on my code : Out of Memory Error
Below is my code :
public class ViewFullImage extends Activity {
//Bitmap bitmap;
private Bitmap bitmap;
private ImageView iv;
private String ImgFile_Name;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.view_draw_picture);
Log.v("","===================== viewFullImage.java================");
try{
String path = "mfc/cam_img/";
int s_id=getIntent().getIntExtra("s_id", -1);
int intentKey=getIntent().getIntExtra("iv", -1);
iv = (ImageView)findViewById(R.id.iv_display);
File Dir= Environment.getExternalStorageDirectory();
File imageDirectory = new File(Dir,path);
File file = new File(imageDirectory, "img_"+s_id+"_"+intentKey+".jpg");
ImgFile_Name = file.getAbsolutePath();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = false;
options.inSampleSize = 1;
BitmapFactory.decodeFile(file.getAbsolutePath(),options);
int h = options.outHeight;
int w = options.outWidth;
Log.v("","This is h : "+h);
Log.v("","This is w : "+w);
bitmap = BitmapFactory.decodeFile(ImgFile_Name,options);
iv = (ImageView)findViewById(R.id.image);
if(h<w)
{
iv.setImageBitmap(rotateBitmap(bitmap));
}
else{
iv.setImageBitmap(bitmap);
}
}catch (Exception e) {
// TODO: handle exception
Log.v("","Exception : "+e);
}
}
Bitmap rotateBitmap(Bitmap bitmap)
{
Matrix matrix = new Matrix();
matrix.postRotate(90);
Bitmap bitmap1 = Bitmap.createBitmap(bitmap, 0, 0,
bitmap.getWidth(), bitmap.getHeight(),
matrix, true);
bitmap.recycle();
bitmap=null;
return bitmap1;
}
}
In this class i am trying to displaying image from sdcard. I am calling this Activity from other activities Like :
Intent intent =new Intent(cxt,ViewFullImage.class);
intent.putExtra("iv", 8);
intent.putExtra("s_id", s_id);
startActivity(intent);
Please somebody tell where i m doing mistack.....

You aren't doing anything wrong, you can't just allocate an image (or even a large string) in Android without knowing if it's going to fit in memory.
The problem happens in Android 4 devices because there is more 4.0 devices out there with only 16MB heaps. The memory heap is the memory where you will open your image in.
To solve this issue you should scale your image if required (depending both on the heap size and image size). Below is the code for how to decode with scaling:
public static Bitmap decodeSampleImage(File f, int width, int height) {
try {
System.gc(); // First of all free some memory
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// The new size we want to scale to
final int requiredWidth = width;
final int requiredHeight = height;
// Find the scale value (as a power of 2)
int sampleScaleSize = 1;
while (o.outWidth / sampleScaleSize / 2 >= requiredWidth && o.outHeight / sampleScaleSize / 2 >= requiredHeight)
sampleScaleSize *= 2;
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = sampleScaleSize;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (Exception e) {
Log.d(TAG, e.getMessage()); // We don't want the application to just throw an exception
}
return null;
}
The other thing is, if you don't free some memory (System.gc()) and you click/switch between many pictures you may run out of memory anyway. If you run out of memory you don't want to blow the app, instead manage the case where the Bitmap is null. You can improve the Exception's catch cases for that as well.
Hope it helps.

Increase image sizes get from cache android

Hi I download images from url & save them in cache. Then load those images from cache into carousel view.
but the problem is when phone resolution(720X1124) is high image size become small.
Here I give the code of images save & show them from cach...
private Bitmap getBitmap(String url)
{
File f=fileCache.getFile(url);
//from SD cache
Bitmap b = decodeFile(f);
if(b!=null)
return b;
//from web
try {
Bitmap bitmap=null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
conn.setConnectTimeout(300000000);
conn.setReadTimeout(300000000);
conn.setInstanceFollowRedirects(true);
InputStream inputstream=conn.getInputStream();
OutputStream outputstream = new FileOutputStream(f);
Utils.CopyStream(inputstream, outputstream);
outputstream.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex){
ex.printStackTrace();
if(ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
public void getDimension(int width,int height){
widthScreen=width;
heightScreen=height;
}
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
//decode image size
final int IMAGE_MAX_SIZE = 120000000; // 1.2MP
BitmapFactory.Options scaleOptions = new BitmapFactory.Options();
scaleOptions.inJustDecodeBounds = true;
FileInputStream stream1=new FileInputStream(f);
BitmapFactory.decodeStream(stream1,null,scaleOptions);
stream1.close();
// find the correct scale value as a power of 2.
int scale = 1;
while (scaleOptions.outWidth / scale / 2 >= widthScreen
&& scaleOptions.outHeight / scale / 2 >= heightScreen) {
scale *= 2;
}
Bitmap bitmap = null;
if (scale > 1) {
scale--;
// scale to max possible inSampleSize that still yields an image
// larger than target
scaleOptions = new BitmapFactory.Options();
scaleOptions.inSampleSize = scale;
bitmap = BitmapFactory.decodeStream(stream1, null, scaleOptions);
int width=widthScreen;
int height=heightScreen;
double y=height;
double x=width;
Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, (int) x,
(int) y, true);
bitmap.recycle();
bitmap = scaledBitmap;
System.gc();
} else {
bitmap = BitmapFactory.decodeStream(stream1);
}
if((widthScreen>=450)&& (heightScreen>=750) ) {
sample=1;
}
else{
sample=2;
}
//decode with inSampleSize
BitmapFactory.Options scalOption = new BitmapFactory.Options();
scalOption.inSampleSize=sample;
FileInputStream stream2=new FileInputStream(f);
Bitmap bitMap=BitmapFactory.decodeStream(stream2, null, scalOption);
stream2.close();
return bitMap;
} catch (FileNotFoundException e) {
}
catch (IOException e) {
e.printStackTrace();
}
return null;
}
how to increase the image sizes according phone resolution. I have tired more days to overcome this problem. But it doesn't work. So give me right instruction.......
thanks............

You need to define your layout for the different screen sizes / resolutions.
See Supporting Multiple Screens.

try to load images with this image loader library

public int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height < reqHeight || width < reqWidth) {
if (width > height) {
inSampleSize = Math.round((float) height / (float) reqHeight);
} else {
inSampleSize = Math.round((float) width / (float) reqWidth);
}
}
return inSampleSize;
}
put this method in my code and call this method as following way ,
private Bitmap decodeFile(File f) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
Matrix matrix = new Matrix();
// matrix.postScale(scaleWidth, scaleHeight);
matrix.postRotate(45);
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
//calculateInSampleSize1(o, widthScreen,heightScreen);
o2.inSampleSize=calculateInSampleSize(o, widthScreen,heightScreen);;
FileInputStream stream2 = new FileInputStream(f);
o2.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}