android:implement Shared Preference

Question

I am making an app in which i have to draw image in canvas and then SAVE that image in shared preference and then show in next screen .Any help will be appreciated

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new DrawingPanel(this));
    mPaint = new Paint();
    mPaint.setDither(true);


//    mPaint.setColor(0xFF FF FF FF);
    System.out.println("hello1");
    mPaint.setColor(Color.BLACK);
    System.out.println("hello2");

    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(3);


}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.game_menu, menu);
    return true;
}
@SuppressWarnings("null")
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()) {
        case R.id.create_new: // **ON THIS CLICK I WANT TO SAVE IMAGE**

            System.out.println("hii");
        //  name = cur.getString(cur.getColumnIndex(MediaStore.Images.Media.DATA));
            System.out.println("hii1");
            date1 = currentTimeString;
            System.out.println("hii2");
        //  cur = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
            System.out.println("hii3");
        //  File f1=new File("/sdcard/" + date1 + ".png");
            System.out.println("hii4");

          //  FileSave fs = null;
        //  fs.Save(f1);
            // Add a new record without the bitmap, but with the values just set.
            // insert() returns the URI of the new record.
        //  Uri uri = getContentResolver().insert(Media.EXTERNAL_CONTENT_URI, values);

            // Now get a handle to the file for that record, and save the data into it.
            // Here, sourceBitmap is a Bitmap object representing the file to save to the database.
            try {
                //   FileOutputStream out = new FileOutputStream(path);
                   bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
            } catch (Exception e) {
                   e.printStackTrace();
            }




            return true;

        case R.id.erase:
        System.out.println("new2");
              mPaint.setColor(-1);
             mPaint.setAlpha(0);
             mPaint.setAntiAlias(true);
             mPaint.setStyle(Paint.Style.STROKE);
             mPaint.setStrokeCap(Paint.Cap.ROUND);
             mPaint.setStrokeWidth(1);


                Intent intent1 = new Intent(getApplicationContext(), CanvasDrawingActivity.class);
                intent1.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent1);
                finish();


            return true;


        default:
            return super.onOptionsItemSelected(item);
    }
}



class DrawingPanel extends SurfaceView implements SurfaceHolder.Callback {
    private DrawingThread _thread;
    private Path path;

    public DrawingPanel(Context context) {
        super(context);
        getHolder().addCallback(this);
        _thread = new DrawingThread(getHolder(), this);
    }




    @Override
    protected void onAttachedToWindow() {
        // TODO Auto-generated method stub
        super.onAttachedToWindow();
        System.out.println("hello");
         Save=(Button)findViewById(R.id.Save);
         System.out.println("hello2");
    }




    public boolean onTouchEvent(MotionEvent event) {
        synchronized (_thread.getSurfaceHolder()) {
        if(event.getAction() == MotionEvent.ACTION_DOWN){
        path = new Path();
        path.moveTo(event.getX(), event.getY());
        path.lineTo(event.getX(), event.getY());
        }else if(event.getAction() == MotionEvent.ACTION_MOVE){
        path.lineTo(event.getX(), event.getY());
        _graphics.add(path);
        path = new Path();
        path.moveTo(event.getX(), event.getY());
        }else if(event.getAction() == MotionEvent.ACTION_UP){
        path.lineTo(event.getX(), event.getY());
        _graphics.add(path);
        }

        return true;
        }
        }

    @Override
    public void onDraw(Canvas canvas) {
        canvas.drawColor(Color.WHITE);
        for (Path path : _graphics) {
            //canvas.drawPoint(graphic.x, graphic.y, mPaint);
            canvas.drawPath(path, mPaint);
            canvas.drawPath(path, mPaint);
        }
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {
        // TODO Auto-generated method stub

    }

    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        _thread.setRunning(true);
        _thread.start();
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        boolean retry = true;
        _thread.setRunning(false);
        while (retry) {
            try {
                _thread.join();
                retry = false;
            } catch (InterruptedException e) {
                // we will try it again and again...
            }
        }
    }
}

class DrawingThread extends Thread {
    private SurfaceHolder _surfaceHolder;
    private DrawingPanel _panel;
    private boolean _run = false;

    public DrawingThread(SurfaceHolder surfaceHolder, DrawingPanel panel) {
        _surfaceHolder = surfaceHolder;
        _panel = panel;
    }

    public void setRunning(boolean run) {
        _run = run;
    }

    public SurfaceHolder getSurfaceHolder() {
        return _surfaceHolder;
    }

    @Override
    public void run() {
        Canvas c;
        while (_run) {
            c = null;
            try {
                c = _surfaceHolder.lockCanvas(null);
                synchronized (_surfaceHolder) {
                    _panel.onDraw(c);
                }
            } finally {
                // do this in a finally so that if an exception is thrown
                // during the above, we don't leave the Surface in an
                // inconsistent state
                if (c != null) {
                    _surfaceHolder.unlockCanvasAndPost(c);
                }
            }
        }
    }
}

}

i want to save this image in shared preference and open in next screen with thumbnail

try this post http://stackoverflow.com/questions/4388140/how-can-i-store-image-in-shared-preferencesand-retrive-it — Ajay, Feb 10 '12 at 05:08
this is more helpful http://stackoverflow.com/questions/8586242/how-can-i-store-images-using-sharedpreference-in-android — Ajay, Feb 10 '12 at 05:08

score 1 · Accepted Answer · answered Feb 10 '12 at 05:45

If you have drawing cache enabled on your SurfaceView, you can get the last cached Bitmap with the getDrawingCache() method of View.

The Bitmap object implements Parcelable; that means you can directly put it into the Intent that is launching your next Activity with Intent.putExtra(key, bitmap).

score 0 · Answer 2 · answered Feb 10 '12 at 05:10

0

You may be able to get the byte array from the bitmap and convert that to a string to save in the shared preference.

But I think saving in sqlite database is a lot more better.

answered Feb 10 '12 at 05:10

blessanm86

31,439
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i am sharing my code , can you plese tell me how to save the image from canvas – Feb 10 '12 at 05:29

score 0 · Answer 3 · answered Feb 10 '12 at 05:12

0

It's possible, using base64 string representation of the image and then save the string in shared preference and You can save the image path in shared preference also.

answered Feb 10 '12 at 05:12

Ajay

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score 0 · Answer 4 · answered Feb 10 '12 at 05:42

0

Are you using sharedPreference just to use image in another activity, then you are misusing a feature, try instead intent to pass bitmap, or use static variable, though I wont suggest to use static variable.

answered Feb 10 '12 at 05:42

jeet

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android:implement Shared Preference

4 Answers4