Develop Reference

Is There A Way To Store SharedPreferences to SDcard?

I've written an app that has several hard-coded settings such as fontSize or targetDirectory. I would like to be able to change those type of settings on an infrequent basis.
SharedPreferences seems to be one way to go about it but I want to share this application and settings, and my phone is not rooted.
My application is a personal tool, and does not have a UI. It opens, does it's job, and then closes. I could create the equivalent of a Windows .ini file and read/write to it, but that seems clunky. Having the SharePreferences file located on the sdcard where I can reach it, instead of device memory, where I can't, seems like that would work.
I do not want to backup these preferences, just be able to edit them, or copy them to a new device.

By default SharedPreferences files are stored in internal storage. You can make a backup of it to SD card programmatically.
File ff = new File("/data/data/"
+ MainActivity.this.getPackageName()
+ "/shared_prefs/pref file name.xml");
copyFile(ff.getPath().toString(), "your sdcard path/save file name.xml");
private void copyFile(String filepath, String storefilepath) {
try {
File f1 = new File(filepath);
File f2 = new File(storefilepath);
InputStream in = new FileInputStream(f1);
OutputStream out = new FileOutputStream(f2);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
System.out.println("File copied.");
} catch (FileNotFoundException ex) {
System.out.println(ex.getMessage());
} catch (IOException e) {
System.out.println(e.getMessage());
}
}
You may replace it back when first start and backup it when application closed.
References: here

How can I get a Picasa image folder on my Marshmallow device?

My application allows users to select an image to upload. When users select an image from a picasa album my data intent comes back with dat=content://com.sec.android.gallery3d.provider/picasa/item/....
Apparently when selecting an image from a picasa folder, I must handle getting the image differently as noted in this answer.
But before I implement a fix, I want to be able to reproduce the crash so I can verify my fix actually works. So how can I get a Picasa folder on my new (marshmallow) Android test device since Picasa has been killed by Google?

The most guaranteed way of getting a file send inside an intent, is to open a stream to it and copy it over to a private folder on your app.
This way works for local file, content uri, picasa, all of it.
Something like that:
private File getSharedFile() {
Uri uri = intent.getExtras().getParcelable(Intent.EXTRA_STREAM);
// or using the new compat lib
Uri uri = ShareCompat.IntentReader(this).getStream();
InputStream is = null;
OutputStream os = null;
try {
File f = ... define here a temp file // maybe getCacheDir();
is = getContentResolver().openInputStream(uri);
os = new BufferedOutputStream(new FileOutputStream(f));
int read;
byte[] bytes = new byte[2048];
while ((read = is.read(bytes)) != -1) {
os.write(bytes, 0, read);
}
return f;
} catch (Exception e) {
... handle exceptions, buffer underflow, NPE, etc
} finally {
try { is.close(); } catch (Exception e) { /* u never know */ }
try {
os.flush();
os.close();
} catch (Exception e) { /* seriously can happen */ }
}
return null;
}

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.

Save Images and copy all images in sd card

I have 10 images and want to save all this images in android application memory . so whenever any use install this apps , he have already this all images .
i have hard coded many times and not get good response .
is there any way . so i will done it.
please help me

Store all your images in the assets folder of your APK. Once it gets installed, scan the internal memory to see if desired images are there. If not, copy them there. In this way, even when users clear data of your application, you can copy them back. Another good thing is the user will not know anything about it as well, so it a good user-experience. Only thing would be your APK size would increase, so manage accordingly.
Try the below piece of code
InputStream inputStream = getAssets().open("yourfile.jpg");
OutputStream out = new FileOutputStream(new File("/sdcard/yourfile.jpg"));
int read = 0;
byte[] bytes = new byte[1024];
while ((read = inputStream.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
inputStream.close();
out.flush();
out.close();

You can keep the files in your asset or res folder , here I have kept the file in res/drawable/ and copy them on sdcard when I require. In below code first we check if file doesn't exist the we create a bitmap from the drawable and write the file out to sdcard.
File file = new File(pathExt+"/Pictures/", "s1.png");
if(isSDCARDMounted()){
if (!file.exists()) {
bmp = BitmapFactory.decodeResource(getResources(),
R.drawable.s1);
try {
FileOutputStream outStream = new FileOutputStream(file);
bmp.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
outStream.flush();
outStream.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
isSDCARDMounted : function for checking if card is mounted or not
pathExt : variable for external storage directory path
Make sure have permission set for writing on external storage
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

Android: Correctly downloading/saving an email attachement

I have an interesting problem: My application is designed to send and open up a zip full of files, and the zip has a special extension (easier for the user). I can zip up the files I need to attach in an e-mail, and I can send them.
When I use the g-mail "view" button and select my app to open the file, it doesn't unzip them correctly. However, if I use the gmail "download" button, and then open the file through a file explorer, the file unzips correctly.
This is the code I use to download the attachment:
// get attachment
try {
attachment = getContentResolver().openInputStream(
getIntent().getData());
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Save it
try {
File root = Environment.getExternalStorageDirectory();
path = root.getPath() + "/PSattachment.psz";
savedFile = new File(path);
FileOutputStream fos = new FileOutputStream(savedFile, false);
BufferedOutputStream os = new BufferedOutputStream(fos);
byte[] buffer = new byte[1024];
int byteRead = 0;
while ((byteRead = attachment.read(buffer)) != -1) {
os.write(buffer, 0, byteRead);
}
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
Am I doing something wrong? Thanks in advance. (Also, the process of unzipping is the same in both cases [file explorer and view from email], so I'm pretty sure it's something in here. Also, the file DOES download, and is the right size. It just won't unzip).

I found the answer!!! Took a while, but at least it works now:
try {
InputStream attachment = getContentResolver()
.openInputStream(getIntent().getData());
savedFile = new File(Environment
.getExternalStorageDirectory().getAbsolutePath(),
"temp" + System.currentTimeMillis() + ".psz");
FileOutputStream f = new FileOutputStream(savedFile);
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = attachment.read(buffer)) > 0) {
f.write(buffer);
}
f.close();
} catch (Exception e) {
}
I just used this code to download the attachment and now everything works perfectly =D

Check this out please:
http://www.jondev.net/articles/Unzipping_Files_with_Android_(Programmatically)
A guide to unzip files in android, hope it helps solve your problem