How to store image in SQLite database

Question

In my application I am uploading an image from gallery and I want to store this image in the SQLite database. How do I store a bitmap in the database? I am converting bitmap to a string and saving it in the database. While retrieving it from the database, I am not able to assign that string to ImageView since it is a string.

Imageupload12 .java:

     public class Imageupload12 extends Activity {       Button buttonLoadImage;       ImageView targetImage;       int i = 0;       Database database = new Database(this);       String i1;       String img;       @Override       public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main5);        buttonLoadImage = (Button) findViewById(R.id.loadimage);        targetImage = (ImageView) findViewById(R.id.targetimage);                  Bundle b = getIntent().getExtras();        if (b != null) {         img = b.getString("image");         targetImage2.setImageURI("image");         //i am getting error as i cant assign string to imageview.             }             buttonLoadImage.setOnClickListener(new Button.OnClickListener() {              public void onClick(View arg0) {          // TODO Auto-generated method stub          Intent intent = new Intent(Intent.ACTION_PICK,           android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);          Log.i("photo", "" + intent);          startActivityForResult(intent, i);          i = i + 1;         }        });            }            @Override       protected void onActivityResult(int requestCode, int resultCode, Intent data) {             // TODO Auto-generated method stub        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {              case 0:          if (resultCode == RESULT_OK) {           Uri targetUri = data.getData();           //             textTargetUri.setText(targetUri.toString());           Bitmap bitmap;           try {            bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));            targetImage.setImageBitmap(bitmap);                 i1 = bitmap.toString();            Log.i("firstimage........", "" + i1);            targetImage.setVisibility(0);                 SQLiteDatabase db = database.getWritableDatabase();            db.execSQL("INSERT INTO UPLOAD VALUES('" + i1 + "');");                } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();           }          }          break;                       }            }      }  

Image.class:

    public class Image extends Activity {      Database database = new Database(this);      static EfficientAdapter adapter, adapter1;      static ListView lv1;           static SQLiteDatabase db;      static EfficientAdapter adp;      static Cursor c1;           static Vector < String > IMAGE = new Vector < String > ();           @Override      public void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       setContentView(R.layout.main);            db = database.getReadableDatabase();       c1 = db.rawQuery("select * from UPLOAD;", null);            if (c1.moveToFirst()) {             do {         IMAGE.add(c1.getString(0).toString());             } while (c1.moveToNext());             c1.close();       }            lv1 = (ListView) findViewById(R.id.List);            adapter = new EfficientAdapter(this);                 lv1.setAdapter(adapter);            ImageView add = (ImageView) findViewById(R.id.imv1a);                      add.setOnClickListener(new OnClickListener() {             @Override        public void onClick(View v) {         // TODO Auto-generated method stub         IMAGE.clear();              Intent i = new Intent(Image.this, Imageupload12.class);         startActivity(i);                  }       });                }                     private static class EfficientAdapter extends BaseAdapter {                 //        protected  final Context Context = null;       protected LayoutInflater mLayoutInflater;       AlertDialog.Builder aBuilder;       public EfficientAdapter(Context context) {        // TODO Auto-generated constructor stub        mLayoutInflater = LayoutInflater.from(context);       }            @Override       public int getCount() {        // TODO Auto-generated method stub             return IMAGE.size();       }            @Override       public Object getItem(int position) {        // TODO Auto-generated method stub        return position;       }            @Override       public long getItemId(int position) {        // TODO Auto-generated method stub        return position;       }            @Override       public View getView(final int position, View convertView, ViewGroup parent) {        // TODO Auto-generated method stub             final ViewHolder mVHolder;        if (convertView == null) {         convertView = mLayoutInflater.inflate(R.layout.pjtlistdetails, parent, false);              mVHolder = new ViewHolder();              mVHolder.t1 = (TextView) convertView.findViewById(R.id.pjtdetails);         mVHolder.time = (TextView) convertView.findViewById(R.id.name);                   mVHolder.imv = (ImageButton) convertView.findViewById(R.id.editic);         mVHolder.imvd = (ImageView) convertView.findViewById(R.id.delete);         mVHolder.imvf = (ImageView) convertView.findViewById(R.id.fwd);                                  mVHolder.imv.setOnClickListener(new View.OnClickListener() {          @Override          public void onClick(View v) {                          String img = IMAGE.elementAt(position);           Log.i("image...", "" + img);                Context ctx = v.getContext();           Intent myIntent = new Intent();           ctx = v.getContext();           myIntent.setClass(ctx, Imageupload12.class);           myIntent.putExtra("image", img);                ctx.startActivity(myIntent);                IMAGE.clear();               }         });         static class ViewHolder {               ImageButton imv;          ImageView imvd, imvf;         }        }       }      }     } 

Answer 1

You have to use "blob" to store image.

ex: to store a image in to db:

public void insertImg(int id , Bitmap img ) {          byte[] data = getBitmapAsByteArray(img); // this is a function      insertStatement_logo.bindLong(1, id);            insertStatement_logo.bindBlob(2, data);      insertStatement_logo.executeInsert();     insertStatement_logo.clearBindings() ;  }   public static byte[] getBitmapAsByteArray(Bitmap bitmap) {     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();     bitmap.compress(CompressFormat.PNG, 0, outputStream);            return outputStream.toByteArray(); } 

To retrieve a image from db:

public Bitmap getImage(int i){      String qu = "select img  from table where feedid=" + i ;     Cursor cur = db.rawQuery(qu, null);      if (cur.moveToFirst()){         byte[] imgByte = cur.getBlob(0);         cur.close();         return BitmapFactory.decodeByteArray(imgByte, 0, imgByte.length);     }     if (cur != null && !cur.isClosed()) {         cur.close();     }             return null; }  

Answer 2

Use blob to store your image in your sqlite database. Below is an example on how to to use blob.

Setting Up the database

CREATE TABLE " + DB_TABLE + "("+                     KEY_NAME + " TEXT," +                     KEY_IMAGE + " BLOB);"; 

Insert in the Database:

public void addEntry( String name, byte[] image) throws SQLiteException{     ContentValues cv = new  ContentValues();     cv.put(KEY_NAME,    name);     cv.put(KEY_IMAGE,   image);     database.insert( DB_TABLE, null, cv ); } 

Retrieving data:

 byte[] image = cursor.getBlob(1); 

Note:

1. Before inserting into database, you need to convert your Bitmap image into byte array first then apply it using database query.
2. When retrieving from database, you certainly have a byte array of image, what you need to do is to convert byte array back to original image. So, you have to make use of BitmapFactory to decode.

Below is an Utility class which I hope could help you:

public class DbBitmapUtility {      // convert from bitmap to byte array     public static byte[] getBytes(Bitmap bitmap) {         ByteArrayOutputStream stream = new ByteArrayOutputStream();         bitmap.compress(CompressFormat.PNG, 0, stream);         return stream.toByteArray();     }      // convert from byte array to bitmap     public static Bitmap getImage(byte[] image) {         return BitmapFactory.decodeByteArray(image, 0, image.length);     } }