When I save and load a jpg image (with a white background) to external storage, it looks like this:
The code:
Save:
try {
outStream = new FileOutputStream(fileUri);
image.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
outStream.flush();
outStream.close();
} catch (Exception e) {
Log.e("cache", e.getMessage());
e.printStackTrace();
}
Load:
Bitmap bm = BitmapFactory.decodeFile(fileUri.toString());
What am I doing wrong? Thanks.
This is the code I use (should work for you):
Save Bitmap:
public void writeBitmapToMemory(String filename, Bitmap bitmap) {
FileOutputStream fos;
// Use the compress method on the Bitmap object to write image to the OutputStream
try {
fos = game.openFileOutput(filename, Context.MODE_PRIVATE);
// Writing the bitmap to the output stream
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
}
And to read:
public Bitmap readBitmapFromMemory(String filename) {
Bitmap defautBitmap = null;
File filePath = game.getFileStreamPath(filename);
FileInputStream fi;
try {
fi = new FileInputStream(filePath);
defautBitmap = BitmapFactory.decodeStream(fi);
}
catch (FileNotFoundException e) {
e.printStackTrace();
}
return defautBitmap;
}
Related
I am new to android so please excuse me for this noob question.
i wanted to save bmp in my external storage after some research i found out that i need to compress the bmp and then use the flush method of FileOutputStream which will save the bmp in my desired location but how does this work and is there any way to use write function by converting the image to raw bytes of data.
File file = new File(folder,s);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
b.compress(Bitmap.CompressFormat.PNG, 100, fos);
try {
fos.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
i have a imageview , i am trying to save bitmap from imageview by this method
bmp.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
the rgb of saved image is not like that it looks in running app,so i am wondering if there is any way to save image view directly to a sd card rather getting the bitmap and then save it to sd card.
please help me i have tried everything.
You can read and write object using below code :
public static void witeObjectToFile(Context context, Object object, String filename)
{
ObjectOutputStream objectOut = null;
try
{
FileOutputStream fileOut = context.openFileOutput(filename, Activity.MODE_PRIVATE);
objectOut = new ObjectOutputStream(fileOut);
objectOut.writeObject(object);
fileOut.getFD().sync();
} catch (IOException e)
{
e.printStackTrace();
} finally
{
if (objectOut != null)
{
try
{
objectOut.close();
} catch (IOException e)
{
// do nowt
}
}
}
}
public static Object readObjectFromFile(Context context, String filename)
{
ObjectInputStream objectIn = null;
Object object = null;
try
{
FileInputStream fileIn = context.getApplicationContext().openFileInput(filename);
objectIn = new ObjectInputStream(fileIn);
object = objectIn.readObject();
} catch (FileNotFoundException e)
{
// Do nothing
} catch (IOException e)
{
e.printStackTrace();
} catch (ClassNotFoundException e)
{
e.printStackTrace();
} finally
{
if (objectIn != null)
{
try
{
objectIn.close();
} catch (IOException e)
{
// do nowt
}
}
}
return object;
}
For example ArrayList can be saved as :
ImageView abcImage = (ImageView) readObjectFromFile(context, AppConstants.FILE_PATH_TO_DATA);
and write as :
witeObjectToFile(context, abcImage, AppConstants.FILE_PATH_TO_DATA);
Try to use this
public void onClick(View v) {
if (v.getId() == R.id.btnSaveImage) {
imageView.setDrawingCacheEnabled(true);
Bitmap bm = imageView.getDrawingCache();
storeImage(bm);
}
}
private boolean storeImage(Bitmap imageData) {
// get path to external storage (SD card)
String iconsStoragePath = Environment.getExternalStorageDirectory() + "/yourappname/";
File sdIconStorageDir = new File(iconsStoragePath);
// create storage directories, if they don't exist
sdIconStorageDir.mkdirs();
try {
File file = new File(sdIconStorageDir.toString() + File.separator + "fileName");
FileOutputStream fileOutputStream = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
imageData.compress(CompressFormat.PNG, 100, bos);
bos.flush();
bos.close();
MediaScannerConnection.scanFile(this, new String[] { file.getPath() },
new String[] { "image/jpeg" }, null);
Toast.makeText(this, "Snapshot Saved to " + file, Toast.LENGTH_SHORT).show();
} catch (FileNotFoundException e) {
return false;
} catch (IOException e) {
return false;
}
return true;
}
After pressing capture Button , image should save in sdcard, it is taking snapshot but not saving the image with that,
Then how can I put the capture button wherever I want? I have an overlay in the Imageview and I need to put the button over the overlay.
Use this one to store image in sd card
public void save(Bitmap image)
{
File sdcard = Environment.getExternalStorageDirectory();
File f = new File (sdcard, imagename);
FileOutputStream out=null;
try {
out = new FileOutputStream(f);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
image.compress(Bitmap.CompressFormat.PNG, 90, out);
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
int picture callback, use like this
jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
camera.startPreview();
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(
"/mnt/sdcard/myphoto.jpg");
outStream.write(data);
outStream.close();
Log.d("Log", "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d("Log", "onPictureTaken - jpeg");
}
};
stream=new ByteArrayOutputStream();
temBitmap=Bitmap.createBitmap(bmp);
temBitmap.compress(Bitmap.CompressFormat.JPEG,100, stream);
path+=String.format(
getString(R.string._sdcard_d_jpg),
System.currentTimeMillis());
outStream = new FileOutputStream(path+extension); // <9>
outStream.write(stream.toByteArray());
outStream.close();
change the above snippet this way:
path+=String.format(
getString(R.string._sdcard_d_jpg),
System.currentTimeMillis());
outStream = new FileOutputStream(path+extension); // <9>
temBitmap=Bitmap.createBitmap(bmp);
temBitmap.compress(Bitmap.CompressFormat.JPEG,100, outStream);
outStream.close();
temBitmap.recycle()
I want to cache some images when downloaded and when again my application starts, it should check if the images are cached so it returns images otherwise null , so I download and cache them again
I tried using LRU Cache http://developer.android.com/reference/android/util/LruCache.html but it didn't work for me , coz its for API level 12, and I am working on 10.
here is that question
caching images with LruCache
What are the other easy adoptable possible solutions to cache
Check out this for storing your files:
Storage options android sdk
okay I did like this
private Bitmap getFile(String fileName) {
Bitmap file = null;
try {
FileInputStream fis;
fis = openFileInput(fileName);
file = BitmapFactory.decodeStream(fis);
fis.close();
}
catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
protected void putFile(Bitmap bitmap, String fileName){
FileOutputStream fos;
try {
fos = openFileOutput(fileName, Context.MODE_PRIVATE);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
}
catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
protected String doInBackground(Void... params) {
for (int i = 0; i < HomeActivity.globalObj.categoriesList.size(); i++) {
Bitmap b;
b = getFile(HomeActivity.globalObj.categoriesList.get(i).name);
if (b == null) {
b = getImageBitmap(HomeActivity.globalObj.categoriesList.get(i).large_image);
putFile(b, HomeActivity.globalObj.categoriesList.get(i).name);
}
ImageView iv = new ImageView(getApplicationContext());
iv.setImageBitmap(b);
imageViewList.add(iv);
}
I have trouble with saving images on sd card. I can see the file on the sd card but file is empty (size 0). I tried saving it on the phone memory and it works fine. Here is my code.
Imagewritter {
public static boolean writeAsJPG(Context context, Bitmap bitmap,
String filename) {
filename = filename + ".jpg";
File path = Environment.getExternalStorageDirectory();
File f = new File(path, filename);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(f);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
fos = context.openFileOutput(filename, Context.MODE_WORLD_READABLE);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d(TAG, "file not found");
return false;
}
bitmap.compress(CompressFormat.JPEG, quality, fos);
try {
fos.flush();
fos.close();
} catch (IOException e) {
Log.d(TAG, "error closing");
e.printStackTrace();
}
}
here is the code where the bitmap comes from.
DrawingView = (drawing) findViewById(R.id.drawing_view);
drawingBitmap = (Bitmap) DrawingView.getBitmap();
String idName = timeStampText;
//save Image as JPG
ImageWritter.writeAsJPG(getApplicationContext(), drawingBitmap, idName);
i think u have to add these permission in manifest file
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Get the image in byte array & check the size of that byte array.. I think you getting 0 size byte array.....
The only problem here is that I have two lines for writing the file. Using FileOutputStream and OpenFileOutput. Just remove these lines and it'll be fine.
try {
fos = context.openFileOutput(filename, Context.MODE_WORLD_READABLE);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d(TAG, "file not found");
return false;
}