Develop Reference

Android: Best way to save image at external Storage

When i'm trying to save an image at some devices the app crashes.
After some research i think the problem is the imageRoot, but i'm kind of lost with so many solutions...
I think the problem is about obtaining external storage path.
The device i'm using to test my app doesn't have any sd card, the path is /mnt/sdcard/Pictures and the image is being saved successfully.
I want it to work whether phone has an sd card or not.
Thanks for any help in advance.
imageRoot=new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "AppName");
private void saveImage() {
Bitmap bitmap = sqimage.getDrawingCache();
File image = new File(imageRoot, imageName);
if (image.exists()) {
image.delete();
}
try {
FileOutputStream output = new FileOutputStream(image);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, output);
output.flush();
output.close();
new SingleMediaFileConnector(getActivity().getApplicationContext(), image);
} catch (FileNotFoundException e) {
e.printStackTrace();
success = false;
} catch (IOException e) {
e.printStackTrace();
success = false;
}
}

Sometimes getExternalStoragePublicDirectory path doesn't exist. You need to check for its existence.
try {
imageRoot=new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "AppName");
File image = new File(imageRoot, imageName);
// Make sure the Pictures directory exists.
imageRoot.mkdirs();
// Other stuffs here
} catch (IOException e) {
// Unable to create file, likely because external storage is
// not currently mounted.
Log.w("ExternalStorage", "Error writing " + file, e);
}
See here for more details.
[Edit]
An alternate way can be use:
getExternalFilesDir(Environment.DIRECTORY_PICTURES);

Setting Google Glass Card image with file URI fails

I'm having issues using the Cards from the recently released GDK. Basically, Card.addImage() can only take two arguments, a resource id or a URI.
For my use case, I need to open an image that exists as a file not directly as a resource. So for testing purposes I'm including the images in the assets folder. Trying to access them directly from the asset folder fails, so I'm copying them from there to internal storage. Once they're copied, I generate a URI from the file and assign it to the card. The resulting card shows a grey block where the image should be.
String fileName = step.attachment; //of the form, "folder1/images/image1.jpg"
File outFile = new File(getFilesDir()+File.separator+fileName);
FileChannel inputChannel = null;
FileChannel outputChannel = null;
try {
//check to see if the file has already been cached in internal storage before copying
if(!outFile.exists()) {
FileInputStream inputStream = new FileInputStream(getAssets().openFd(fileName).getFileDescriptor());
FileOutputStream outputStream = openFileOutput(fileName, Context.MODE_PRIVATE);
inputChannel = inputStream.getChannel();
outputChannel = outputStream.getChannel();
outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
try {
if(inputChannel!=null)
inputChannel.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
if(outputChannel!=null)
outputChannel.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
card.addImage(Uri.fromFile(outFile));
It's hard to diagnose because I have no clue what the Card is doing internally.

Instead of writing
new FileInputStream(getAssets().openFd(fileName).getFileDescriptor());
can you try
getAssets().openFd(fileName).createInputStream();
and see if it works?
To answer your original question, the addImage method supports resource: and file: URIs.

This is very strange, but I managed to solve my problem. I replaced the file copy code with the following and it appears to have solved my issues
InputStream in = null;
OutputStream out = null;
try {
in = getAssets().open(step.attachment);
out = new FileOutputStream(outFile);
byte[] buffer = new byte[1024];
int read;
while((read = in.read(buffer)) != -1){
out.write(buffer, 0, read);
}
in.close();
in = null;
out.flush();
out.close();
out = null;
} catch(IOException e) {
Log.e("tag", "Failed to copy asset file: " + step.attachment, e);
}
It's not clear to me why/how I was copying my entire apk, but I'm guessing it's the call to
getAssets().openFd(fileName).getFileDescriptor()
Perhaps it was returning the file descriptor of the apk. It's odd because I've seen some claim that the previous method works.

how to save the image in sdcard in android

i am working on OpenGl Es in android.given efects on images and when i save the image in sdcard it showing black image.how i solve this problem.
File cacheDir;
Toast.makeText(ImageProcessingActivity.this, "Photo", 500).show();
Bitmap icon;
frame.setDrawingCacheEnabled(true);
icon = Bitmap.createBitmap(frame.getDrawingCache());
Bitmap bitmap = icon;
frame.setDrawingCacheEnabled(false);
// File mFile1 = Environment.getExternalStorageDirectory();
Date d = new Date();
String fileName = d.getTime() + "mg1.jpg";
File storagePath = (Environment.getExternalStorageDirectory());
File dest = new File(storagePath + "/CityAppImages");
if (!dest.exists()) {
dest.mkdirs();
}
File mFile2 = new File(dest, fileName);
sdpath = mFile2.getAbsolutePath();
Log.d("qqqqqqqqqqqqqqqqqqqqqqq", "zzzzzzzz" + sdpath);
try {
FileOutputStream outStream;
outStream = new FileOutputStream(mFile2);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
outStream.flush();
outStream.close();
Toast.makeText(ImageProcessingActivity.this, "Photo Saved Sucessfully", 500)
.show();
image.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(ImageProcessingActivity.this, "Photo Not Saved Sucessfully",500).show();
}

I had this problem once and it was because getDrawingCache is not what it should be. The problem is not the saving, is the way you do it.
From what I understand you want to capture the screen of your app, but this is very tricky and can cause a lot of problems.
Read this topic, since it helped me a lot when I had this problem.
How to programmatically take a screenshot in Android?
Edit:
Also, because you are using GLES and then printing the screen you should go to Settings > Developer Options > check Disable Hardware Overlays and Force GPU Rendering.

Downloading an audio file from raw folder to SD card

I need to download a file from an application. I have 5 audio files in a raw folder. On the onclick event of a button I need to select one audio file from 5 files and download it to an SD card.
How can I acheive this?

this is so simple but mistakefull ... try this code :
File directoryTest = new File(
Environment.getExternalStorageDirectory(), "raw2sd");
try {
//coping sound file to sd
//defining specific directory
File soundDir = new File(directoryTest, "ORG");
//making directories
soundDir.mkdirs();
FileOutputStream sound = new FileOutputStream(
soundDir.getPath() + "/soundName.mp3");
InputStream is = getResources().openRawResource(R.raw.soundFile);
int a = is.available();
byte[] buf = new byte[a];
is.read(buf, 0, a);
sound.write(buf);
sound.flush();
sound.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
this is 100% tested.

Store and retrieve images into sdcard

I have a set of image urls. I download it to bitmap. Now I want to store these images into sdcard/project folder. If I don't have such a file, I have to create it. What I have done right now is:
String path = Environment.getExternalStorageDirectory().toString();
OutputStream fOut = null;
File file = new File(path, imageName);
if(!file.exists()) {
file.mkdir();
try {
fOut = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
fOut.flush();
fOut.close();
MediaStore.Images.Media.insertImage(getContentResolver(), "file://"
+ file.getAbsolutePath(), file.getName(), file.getName());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
But I am not getting images inserted into sdcard. What is wrong in my code? Please reply. Thanks in advance.

Try using the below code:
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
String fileName = edtNameImage.getText().toString().trim();//this can be changed
if (fileName.equalsIgnoreCase("")) {
Toast.makeText(context, "Fields cannot be left blank",
Toast.LENGTH_SHORT).show();
return false;
}
File file = new File(Environment.getExternalStorageDirectory()
+ File.separator + fileName);
// write the bytes in file
FileOutputStream fo;
try {
file.createNewFile();
fo = new FileOutputStream(file);//snapshot image is the image to be stored.
if (snapShotImage!=null)
{
snapShotImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
}else{
return false;
}
fo.write(bytes.toByteArray());
// ChartConstants.IMAGE_STORAGE++;
fo.flush();
fo.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return true;
You can also check for duplicacy in names with some additional code lines.
Let me know if it helps.

Have you made sure that the appropriate permissions for writing to/reading from an external storage device have been set in your Manifest.xml file?
Also, does the code exit with any of the exceptions above? Print more illustrative messages than the stacktrace. Something like so:
try {
} catch (FileNotFoundException e) {
Log.v(this.toString(), "Exception caught in block");
}
or something on these lines..
HTH
Sriram

Problems with your code:
1) You are creating a directory with the filename. Instead try mkdir() with only the 'path'
2) Pass only 'file.getAbsolutePath()' without the "file://" to insertImage() function
3) There is an alternate api to insertImage for which you need not create one more file locally. Pass the bitmap directly to that.
Hope this helps.