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

I had the same problem. In short: subclass the Application (or create a helper singleton), use it ( 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);
    }
}