Thanks all for the efforts Robin & et. al.,
I am trying to so something very similar - create a signature page.
Did you figure what was missing to get the erase and properly saved image
here?
thanks
john
On Wednesday, February 16, 2011 1:17:15 PM UTC-6, Robin Talwar wrote:
>
> Alright
>
> So now i have 2 classes in my application.
> the one is the custom view extending view and has all touch events on key
> down and on key up.
> This view is being called in my main.xml through the package name.
> The other one is my main class which has the code to call options menu.
> One menu item is Save and if user clicks on it the bitmap image created by
> the custom view is to be saved .
> It is actually getting saved but it is showing just the background not the
> changed bitmap image through the touch of the user.
>
> The custom view code is exactly the same as the FingerPaint class file in
> api demos
>
> The only thing where i am getting stuck is now how to save the changed
> bitmap image which is created by the users touch i can save the initial one
>
> The code of main class file is :-
> package org.testCircle;
>
> import android.app.Activity;
> import android.graphics.Bitmap;
> import android.graphics.Canvas;
> import android.os.Bundle;
> import android.provider.MediaStore.Images;
> import android.view.Menu;
> import android.view.MenuItem;
> import android.widget.TextView;
> import android.widget.Toast;
>
> public class testCircle extends Activity {
> TextView tv;
> /** Called when the activity is first created. */
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> //setContentView(new customView(this));
> setContentView(R.layout.main);
> }
> public boolean onCreateOptionsMenu(Menu menu) {
> super.onCreateOptionsMenu(menu);
>
> menu.add(0, 1, 0, "save").setShortcut('3', 'c');
> return true;
> }
> public boolean onPrepareOptionsMenu(Menu menu) {
> super.onPrepareOptionsMenu(menu);
> return true;
> }
>
> @Override
> public boolean onOptionsItemSelected(MenuItem item) {
> switch (item.getItemId()) {
> case 1:
> //new ColorPickerDialog(this, this, mPaint.getColor()).show();
> fingerPaint cv = new fingerPaint(this);
> Bitmap viewBitmap = Bitmap.createBitmap(cv.getWidth(),
> cv.getHeight(),Bitmap.Config.ARGB_8888);
> Canvas canvas = new Canvas(viewBitmap);
> cv.draw(canvas);
> String url = Images.Media.insertImage(getContentResolver(),
> viewBitmap, "title", null);
> Toast.makeText(testCircle.this, url, Toast.LENGTH_LONG).show();
> return true;
> }
> return super.onOptionsItemSelected(item);
> }
> }
>
>
> and the Custom View is
>
> package org.testCircle;
>
> import android.content.Context;
> import android.graphics.Bitmap;
> import android.graphics.Canvas;
> import android.graphics.Paint;
> import android.graphics.Path;
> import android.util.AttributeSet;
> import android.view.MotionEvent;
> import android.view.View;
>
> public class fingerPaint extends View {
> Paint mPaint;
>
> private static final float MINP = 0.25f;
> private static final float MAXP = 0.75f;
>
> private static Bitmap mBitmap;
> private Canvas mCanvas;
> private Path mPath;
> private Paint mBitmapPaint;
>
> public fingerPaint(Context c) {
> super(c);
> mPaint = new Paint();
> mPaint.setAntiAlias(true);
> mPaint.setDither(true);
> mPaint.setColor(0xFFFF0000);
> mPaint.setStyle(Paint.Style.STROKE);
> mPaint.setStrokeJoin(Paint.Join.ROUND);
> mPaint.setStrokeCap(Paint.Cap.ROUND);
> mPaint.setStrokeWidth(12);
> mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
> mCanvas = new Canvas(mBitmap);
> mPath = new Path();
> mBitmapPaint = new Paint(Paint.DITHER_FLAG);
> }
>
> public fingerPaint(Context c , AttributeSet attrs){
> super(c , attrs);
> mPaint = new Paint();
> mPaint.setAntiAlias(true);
> mPaint.setDither(true);
> mPaint.setColor(0xFFFF0000);
> mPaint.setStyle(Paint.Style.STROKE);
> mPaint.setStrokeJoin(Paint.Join.ROUND);
> mPaint.setStrokeCap(Paint.Cap.ROUND);
> mPaint.setStrokeWidth(12);
> mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
> mCanvas = new Canvas(mBitmap);
> mPath = new Path();
> mBitmapPaint = new Paint(Paint.DITHER_FLAG);
> }
>
> public void onerase(){
> mCanvas=null;
> }
>
> @Override
> protected void onSizeChanged(int w, int h, int oldw, int oldh) {
> super.onSizeChanged(w, h, oldw, oldh);
> }
>
> @Override
> protected void onDraw(Canvas canvas) {
> canvas.drawColor(0xFFAAAAAA);
>
> canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
>
> canvas.drawPath(mPath, mPaint);
> }
>
> private float mX, mY;
> private static final float TOUCH_TOLERANCE = 4;
>
> private void touch_start(float x, float y) {
> mPath.reset();
> mPath.moveTo(x, y);
> mX = x;
> mY = y;
> }
> private void touch_move(float x, float y) {
> float dx = Math.abs(x - mX);
> float dy = Math.abs(y - mY);
> if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
> mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
> mX = x;
> mY = y;
> }
> }
> private void touch_up() {
> mPath.lineTo(mX, mY);
> // commit the path to our offscreen
> mCanvas.drawPath(mPath, mPaint);
> // kill this so we don't double draw
> mPath.reset();
> }
>
> @Override
> public boolean onTouchEvent(MotionEvent event) {
> float x = event.getX();
> float y = event.getY();
>
> switch (event.getAction()) {
> case MotionEvent.ACTION_DOWN:
> touch_start(x, y);
> invalidate();
> break;
> case MotionEvent.ACTION_MOVE:
> touch_move(x, y);
> invalidate();
> break;
> case MotionEvent.ACTION_UP:
> touch_up();
> invalidate();
> break;
> }
> return true;
> }
>
> }
>
>
> On Tue, Feb 15, 2011 at 6:35 PM, Marcin Orlowski
> <webnet....@gmail.com<javascript:>
> > wrote:
>
>> On 15 February 2011 13:10, Robin Talwar
>> <r.o.b.i.n...@gmail.com<javascript:>>
>> wrote:
>>
>> > Saving this bitmap and
>>
>> String path = Environment.getExternalStorageDirectory().toString();
>> OutputStream fOut = new FileOutputStream( new File(path, "filename.jpg) );
>> bitmap.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
>> fOut.flush();
>> fOut.close();
>>
>> > Erase button to clear all the canvas so that user can again make
>> signature
>> > on clear screen.
>>
>>
>> http://developer.android.com/reference/android/graphics/Canvas.html#drawRGB%28int,%20int,%20int%29
>>
>> but again: do RTFM first as there are other options you may want to
>> utilse (i.e. you may want to save as PNG instead of lossy JPEG) or
>> simply to know whene you will be trying to reinvent the wheel.
>>
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>
>
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