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How to update the existing sticker pack of Whatsapp

I have written codes for adding sticker pack dynamically. But I want to know how to update the sticker pack after adding to whatsapp?
I can add sticker file to the pack which is listed on my app only but it is not reflecting in whatsapp. I tried adding files to the same location (file:///...) from where the pack was sent to whatsapp.
I want to try updating content provider. But how to do that? Can I add files to whatsapp's 'content://...' uri or should I update my app's content provider or anything else?
I am using react-native-whatsapp-stickers module for react-native.
react-native code
invoking after adding single sticker from UI
const addOne = (path, packName) =>{
// log('path ',path[0])
// log('packName ',packName)
RNWhatsAppStickers.addSticker(path[0],packName)
.then(res=>RNWhatsAppStickers.send(packName,packName))
.then(res=>console.log('response ',res))
}
Java code of module RNWhatsAppStickers
#ReactMethod
public void send(String identifier, String stickerPackName, Promise promise) {
Intent intent = new Intent();
intent.setAction("com.whatsapp.intent.action.ENABLE_STICKER_PACK");
intent.putExtra(EXTRA_STICKER_PACK_ID, identifier);
intent.putExtra(EXTRA_STICKER_PACK_AUTHORITY, getContentProviderAuthority(reactContext));
intent.putExtra(EXTRA_STICKER_PACK_NAME, stickerPackName);
try {
Activity activity = getCurrentActivity();
ResolveInfo should = activity.getPackageManager().resolveActivity(intent, 0);
if (should != null) {
activity.startActivityForResult(intent, ADD_PACK);
promise.resolve("OK");
} else {
promise.resolve("OK, but not opened");
}
} catch (ActivityNotFoundException e) {
promise.reject(ERROR_ADDING_STICKER_PACK, e);
} catch (Exception e) {
promise.reject(ERROR_ADDING_STICKER_PACK, e);
}
}
// saving image to same pack
public static void SaveImage(Bitmap finalBitmap, String name, String identifier) {
String root = path + "/" + identifier;
File myDir = new File(root);
myDir.mkdirs();
String fname = name;
File file = new File(myDir, fname);
if (file.exists()){
// Log.d("ReactNative","root "+root);
file.delete();
}
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.WEBP, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
Please give any idea what to do? Thanks

I found the solution on official doc. You have to increase the image_data_Version for that pack after adding new images.
To track the image_data_Version you can query the ContentProvider of your app or Store the image_data_Version somewhere and make changes accordingly .

Android Studio - Read and Write to/from file in local storage within a folder

So I'm trying to read and write to and from a file that is inside a folder within the app's directory. So the path is something like "package/userFiles/'insert file name here'" but I can't find a way to do it anywhere.
I haven't been able to test this yet but the below is the code I've got for writing a quick and simple string to the file. If you could take a look over that I would be grateful, and if at all possibly give me some direction over how to read from the file.
FileOutputStream outputStream;
File path = new File(getFilesDir(),"userFiles");
path.mkdirs();
File mypath =new File(path,newFileNameText);
try {
FileOutputStream out = new FileOutputStream(mypath);
String defaultMessage = "Empty File";
out.write(defaultMessage.getBytes());
out.close();
Intent intent = new Intent(getApplicationContext(), EditFileContents.class);
intent.putExtra(EXTRA_MESSAGE,newFileNameText);
startActivity(intent);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
You can see the code starts a new activity, it is this activity from which I would like to be able to read the contents of the file.

Displaying Base64-Encoded String of raw PDF data using ThinkFree PDF Viewer

The problem:
I'm getting a Base64-Encoded String of raw PDF data from a web service (this data is housed in my String array pdfData). I have to use this data display the PDF in a PDF viewer (I happen to be using the included 'ThinkFree PDF Viewer' since I'm working on an Android application, but lets generalize and say any PDF viewer will do). Note that I'm accessing the 0th element of this array just for testing purposes (to make sure I can at least pull up 1 PDF before writing the code to pull up all the PDFs).
The code is within a class. First the method createFile is called, then intentOpenPDF:
import org.apache.commons.codec.binary.Base64;
File file;
FileOutputStream outputStream;
private byte[] decodedContent;
private String[] pdfData;
private String[] pdfFileName;
public void createFile() {
decodedContent = Base64.decodeBase64(pdfData[0].getBytes());
try {
File path = new File(getFilesDir(), "PDFs");
if (!path.exists()) {
path.mkdirs();
}
file = new File(path, pdfFileName[0]);
outputStream = new FileOutputStream(file);
outputStream.write(decodedContent);
outputStream.close();
}
catch (FileNotFoundException ex) {
ex.printStackTrace();
}
catch (IOException ex) {
ex.printStackTrace();
}
finally {
// Make absolutely certain the outputStream is closed
try {
if (outputStream != null) {
outputStream.close();
}
}
catch (IOException ex) {
ex.printStackTrace();
}
}
}
public void intentOpenPDF() {
// Make sure the file exists before accessing it:
if (file.exists()) {
Uri targetUri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(targetUri, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
}
}
The error:
Error opening file. It does not exist or cannot be read.
I have a break point set inside the conditional statement that checks if the file exists (within the intentOpenPDF method), and it IS passing this check.

The path produced by calling getFilesDir() leads a protected directory (file:///data/data/), where only files created with openFileOutput(String, int) are stored. I am not creating the file this way. The solution in my case is to use getExternalFilesDir(null).getAbsolutePath() instead, which will give you a path a directory internal to the application (/storage/emulated/0/Android/data/). No permissions are required to read or write to this path.

Considering your error message:
It does not exist or cannot be read.
as you verified it exists (first possible cause), it's certainly not readable (second possible cause).

New to Java. Problems reading from file using Context and openFileInput

I've been trying to do this on my own for the past couple hours and am kinda losing it a little.
All I want to do is open a file, read it and display it to the console; that's it.
I'm using eclipse to develop for android 2.3.3.
I have tried using a bunch of different ways with code that I have found here, and on other sites. Here is what I have now and how its all called:
In the OnCreate function:
setContentView(new TestMap(this));
The testMap class:
TestMap(Context context){
super(context);
// might need to be on the panel class
loadTileFile("worldonelayout.txt", context);
in the same class:
private void loadTileFile (String filename, Context context){
FileInputStream input = null;
InputStreamReader reader = null;
char[] inputBuffer = new char[256];
String data = null;
try {
input = context.openFileInput("worldonelayout.txt");
reader = new InputStreamReader(input);
reader.read(inputBuffer);
data = new String(inputBuffer);
System.out.println(data);
Toast.makeText(context, "Text read", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, "Text not read", Toast.LENGTH_SHORT).show();
} finally {
try {
input.close();
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
This code doesnt work. It always hits the exception.
"/data/data/com.name.somethingiremoved/files/worldonelayout.txt (No such file or directory)".
This happens at the first CATCH. BTW my file is in the root directory: Documents\Eclipse\workspace\project\worldonelayout.txt. I can also see the file in the browser on the left
From what I have seen here and on other sites, it is something to do with the Context class being derived from the Activity? I don't want to have this code in the same class as my activity. Is there a way round this?
If you need anything more from me, let me know.

The open file is looking for a file on the phone's file system, not on the computer's. Its telling you exactly where it expects to find it - on the phone under /data/data/com.name.somethingiremoved/files/worldonelayout.txt

Writing a file to sdcard

I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved.
I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest
and tried many different combinations of tutorials I found on the net.
All I could find was using the openFileOutput("",MODE_WORLD_READABLE) method, of the activity but how my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written,
so giving an activity object didn't work even though I tried it.
The app has come a long way and I cannot change how the app is currently written.
Please, someone help me?
CODE:
File file = new File(bgdmanip.savLocation);
FileOutputStream filecon = null;
filecon = new FileOutputStream(file);
byte[] myByte;
myByte = Base64Coder.decode(seReply);
bos.write(myByte);
filecon.write(myByte);
myvals = x * 11024;
bgdmanip.savLocation holds the whole files path. seReply is a string reply from HttpPost response. The second set of code is looped with reference to x. The file is created but remains 0 bytes.

//------------------------------WRITING DATA TO THE FILE ---------------------------------
btnWriteSDFile.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
try {
File myFile = new File("/sdcard/mysdfile.txt");
myFile.createNewFile();
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter =new OutputStreamWriter(fOut);
myOutWriter.append(txtData.getText());
myOutWriter.close();
fOut.close();
Toast.makeText(v.getContext(),"Done writing SD 'mysdfile.txt'", Toast.LENGTH_SHORT).show();
txtData.setText("");
}
catch (Exception e)
{
Toast.makeText(v.getContext(), e.getMessage(),Toast.LENGTH_SHORT).show();
}
}
});
//---------------------------READING DATA FROM THE FILE PLACED IN SDCARD-------------------//
btnReadSDFile.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
try {
File myFile = new File("/sdcard/mysdfile.txt");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(new InputStreamReader(fIn));
String aDataRow = "";
String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null)
{
aBuffer += aDataRow ;
}
txtData.setText(aBuffer);
myReader.close();
Toast.makeText(v.getContext(),"Done reading SD 'mysdfile.txt'",Toast.LENGTH_SHORT).show();
}
catch (Exception e)
{
Toast.makeText(v.getContext(), e.getMessage(),Toast.LENGTH_SHORT).show();
}
}
});
ALONG WITH THIS ALSO WRITE THIS PERMISSION IN Android.Manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

The openFileOutput() method writes data to your application's private data area (not the SD card), so that's probably not what you want. You should be able to call Environment.getExternalStorageDirectory() to get the root path to the SD card and use that to create a FileOutputStream. From there, just use the standard java.io routines.

Here is a sample:
// Log used as debug
File log = new File(Environment.getExternalStorageDirectory(), "Log.txt");
try {
out = new BufferedWriter(new FileWriter(log.getAbsolutePath(), false));
out.write(new Date().toString());
out.write(" : \n");
} catch (Exception e) {
Log.e(TAG, "Error opening Log.", e);
}