Saving an image on sqlite from camera or gallery

问题

I am struggling with saving image on sqlite. I am trying to save image as blob on sqlite. I don't know how to declare imageView to byte[] because I am using insert method on dbAdapter. Is it good way to save the image into database? some people said that saving file path url into database is better. If it is better, please give me some your hands. I am really getting tough for that. Many thanks.

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    super.onActivityResult(requestCode, resultCode, data);
     if (resultCode != RESULT_OK) return;
       switch (requestCode)
       {
        case PICK_FROM_CAMERA:
        Bundle extras = data.getExtras();
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        Bitmap selectedImage = (Bitmap) extras.get("data");
        selectedImage = Bitmap.createScaledBitmap(selectedImage, 200, 250, false);
        selectedImage.compress(CompressFormat.PNG, 0, bos);
        mImageView.setImageBitmap(selectedImage);
        break;

        case PICK_FROM_GALLERY:
            Uri selectedImageUri = data.getData();
            selectedImagePath = getPath(selectedImageUri);
            System.out.println("Image Path : " + selectedImagePath);
            mImageView.setImageURI(selectedImageUri);
        break;
       }
}

protected void onSaveInstanceState(Bundle outState)
{
    super.onSaveInstanceState(outState);
    saveState();
}

private void saveState() 
{
    String name = (String) nameEdit.getText().toString();
    String category = (String) categoryEdit.getText().toString();
    String expired_date = (String) expired_Date_Btn.getText().toString();
    //byte[] image = (byte[]) mImageView... I HAVE TO DO SOME CODING HERE.. 
    if(mRowId == null)
    {
        long id = mDbHelper.insertItem(category, name, expired_date, image);

        if(id>0)
        {
            mRowId = id;
        }           
    }
    else 
    {
        mDbHelper.updateItem(mRowId, category, name, expired_date, image);
    }   
}

DbAdapter class

    public long insertItem(String category, String name, String expired_date, byte[] image)
{
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_CATEGORY, category);
    initialValues.put(KEY_NAME, name);
    initialValues.put(KEY_EXPIRED_DATE, expired_date);
    initialValues.put(KEY_IMAGE, image);
    return db.insert(DATABASE_TABLE, null, initialValues);
}

回答1:

Try doing this:

ConvertDrawableToByteArray(mImageView.getDrawable()

With ConvertDrawabelToByteArray defined like this:

public static byte[] ConvertDrawableToByteArray(Drawable drawableResource) {

    Bitmap imageBitmap = ((BitmapDrawable) drawableResource).getBitmap();
    ByteArrayOutputStream imageByteStream = new ByteArrayOutputStream();
    imageBitmap.compress(Bitmap.CompressFormat.PNG, 100, imageByteStream);
    byte[] imageByteData = imageByteStream.toByteArray();
    return imageByteData;
}

Though I think you should be able to get the bytes out of the Bitmap as well. All that said, storing the filepath in sql lite would probably be more efficient, however, if the user deletes the image you'd have to handle that in your application.

回答2:

For your other part of question about camera,this piece of code will be helpfull.

buttonClick = (Button) findViewById(R.id.buttonClick);
buttonClick.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);
    }
});

myDBHelper = new MyDBHelper(this);
readDatabase();
}

protected void newTab(String label, Drawable icon, int page) {
    TabSpec tabSpec = tabHost.newTabSpec(label);
    tabSpec.setIndicator(label,icon);
    tabSpec.setContent(page);
    tabHost.addTab(tabSpec);
}

// Called when shutter is opened
ShutterCallback shutterCallback = new ShutterCallback() {
    public void onShutter() {
    }
};

// Handles data for raw picture
PictureCallback rawCallback = new PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {
    }
};

// Handles data for jpeg picture
PictureCallback jpegCallback = new PictureCallback() {
    public void onPictureTaken(byte[] data, Camera camera) {

        SQLiteDatabase db = myDBHelper.getReadableDatabase();
        ContentValues values = new ContentValues();
        values.put("image", data);
        db.insert("storedImages", "tag", values);
        preview.camera.startPreview();
    }
};

protected void readDatabase() {
    TextView info = (TextView) findViewById(R.id.info);
    info.setText("Integer.toString(cursor.getCount())");
    SQLiteDatabase db = myDBHelper.getReadableDatabase();
    Cursor cursor = db.rawQuery("SELECT * FROM storedImages ;", null);

    info.setText(Integer.toString(cursor.getCount()));

    if (cursor.getCount()>0) {
        cursor.moveToNext();
        ImageView image = (ImageView) findViewById(R.id.image);
        byte[] data = cursor.getBlob(cursor.getColumnIndex("image"));
        image.setImageBitmap(BitmapFactory.decodeByteArray(data, 0, data.length));
    }
}

}

Have a look at this

来源：https://stackoverflow.com/questions/8359820/saving-an-image-on-sqlite-from-camera-or-gallery