How to send large byte arrays between activities in Android?

Question

I need to send byte[] data from Activity1 to Activity2, in order to writedata(\"FileOutputStream.write(data)\") in a jpg

Answer 1

1. Create a temporary file.
2. Pass the file path to the Other Activity.
3. Get the path and load the image.

Activity 1 :

    //creates the temporary file and gets the path
String filePath= tempFileImage(context,yourBitmap,"name");



Intent intent = new Intent(context, Activity2.class);

//passes the file path string with the intent 
intent.putExtra("path", filePath);


startActivity(intent);

Use this method to create the file:

   //creates a temporary file and return the absolute file path
public static String tempFileImage(Context context, Bitmap bitmap, String name) {

    File outputDir = context.getCacheDir();
    File imageFile = new File(outputDir, name + ".jpg");

    OutputStream os;
    try {
        os = new FileOutputStream(imageFile);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, os);
        os.flush();
        os.close();
    } catch (Exception e) {
        Log.e(context.getClass().getSimpleName(), "Error writing file", e);
    }

    return imageFile.getAbsolutePath();
}

Activity 2 :

//gets the file path
String filePath=getIntent().getStringExtra("path");

//loads the file
File file = new File(filePath);

Finally load the image:

Picasso.with(context).load(file).fit().centerCrop().into(imageView);

Or:

Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
imageView.setImageBitmap(bitmap);

Answer 2

I had the same problem. In short: subclass the Application (or create a helper singleton), use it (<application android:name=".App" .../> in manifest.xml) and store the image data there.

App.java snippet:

public final class App extends Application {
    private static App sInstance;
    private byte[] mCapturedPhotoData;

    // Getters & Setters
    public byte[] getCapturedPhotoData() {
        return mCapturedPhotoData;
    }

    public void setCapturedPhotoData(byte[] capturedPhotoData) {
        mCapturedPhotoData = capturedPhotoData;
    }

    // Singleton code
    public static App getInstance() { return sInstance; }

    @Override
    public void onCreate() {
        super.onCreate();
        sInstance = this;
    }
}

Camera Activity saves the data:

private Camera.PictureCallback mJpegCaptureCallback = new Camera.PictureCallback() {
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
        // We cannot pass the large buffer via intent's data. Use App instance.
        App.getInstance().setCapturedPhotoData(data);
        setResult(RESULT_OK, new Intent());
        finish();
    }
};

Parent Activity reads the data:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == RequestCode.CAPTURE && resultCode == RESULT_OK) {
        // Read the jpeg data
        byte[] jpegData = App.getInstance().getCapturedPhotoData();
        App.log("" + jpegData.length);

        // Do stuff

        // Don't forget to release it
        App.getInstance().setCapturedPhotoData(null);
    }
}

Answer 3

Following are the steps:

1) Create table in sqlite with byte and id columns 2) Save this byte and his id (you will give) from Activity 1 3) Go to Activity 2 (do not forget to send parameter id) 4) In Activity 2 get this parameter from intent and query database using id to get you byte.

I hope this helps.