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POWhen saving the new image it keeps the old canvas
 

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  1. POWhen saving the new image it keeps the old canvas
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    <p>I have a canvas which allows user to draw and save. It also allows user to change color and draw on the same canvas with different colors.</p> <p>My Paint class:</p> <pre><code>package com.test.testing; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Paint.Style; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.test.testing.*; public class CustomView extends View { Paint paint; Path path; float x = 0; float y = 0; private int cWhite = Color.WHITE; private Button btnS, btnSa; public CustomView(Context context) { super(context); paint = new Paint(); path= new Path(); paint.setAlpha(255); paint.setColor(cWhite); paint.setStyle(Style.STROKE); paint.setStrokeWidth(20); btnS = (Button)((FreeDraw) context).findViewById(R.id.shareButton); btnSa = (Button)((FreeDraw) context).findViewById(R.id.saveButton); } protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawPath(path,paint); canvas.drawCircle(x, y, 10, paint); } public boolean onTouchEvent(MotionEvent event) { int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: path.moveTo(event.getX(), event.getY()); path.lineTo(event.getX(), event.getY()); if (btnS.getVisibility() == View.VISIBLE &amp;&amp; btnS != null) { //if share button is displaying but I drew something else //the share button should disappear and I should be presented //with the save button btnS.setVisibility(View.GONE); btnSa.setVisibility(View.VISIBLE); } if (btnSa.getVisibility() == View.VISIBLE &amp;&amp; btnS != null) { //do nothing... } invalidate(); break; case MotionEvent.ACTION_MOVE: x = event.getX(); y = event.getY(); path.lineTo(x, y); invalidate(); break; case MotionEvent.ACTION_UP: path.lineTo(event.getX(), event.getY()); invalidate(); break; case MotionEvent.ACTION_CANCEL: break; default: break; } return true; } } </code></pre> <p>In my Activity I call the Paint class and use an XML layout like this:</p> <pre><code>layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); </code></pre> <p>Also in the same activity I have the following code which handles the color changing:</p> <pre><code>public void colorHandle() { // custom dialog final Dialog dialog = new Dialog(this); dialog.setContentView(R.layout.colorlayout); dialog.setTitle("Choose a Drawing Color"); Button btnWH = (Button) dialog.findViewById(R.id.btnWhite); Button btnBL = (Button) dialog.findViewById(R.id.btnBlack); Button btnBLU = (Button) dialog.findViewById(R.id.btnBlue); Button btnCY = (Button) dialog.findViewById(R.id.btnCyan); Button btnDG = (Button) dialog.findViewById(R.id.btnDkGray); Button btnGR = (Button) dialog.findViewById(R.id.btnGray); Button btnGRE = (Button) dialog.findViewById(R.id.btnGreen); Button btnLG = (Button) dialog.findViewById(R.id.btnLtGray); Button btnMG = (Button) dialog.findViewById(R.id.btnMagenta); Button btnRD = (Button) dialog.findViewById(R.id.btnRed); Button btnYE = (Button) dialog.findViewById(R.id.btnYellow); if (btnWH != null) { btnWH.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.WHITE); dialog.dismiss(); } }); } if (btnBL != null) { btnBL.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.BLACK); dialog.dismiss(); } }); } if (btnBLU != null) { btnBLU.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.BLUE); dialog.dismiss(); } }); } if (btnCY != null) { btnCY.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.CYAN); dialog.dismiss(); } }); } if (btnDG != null) { btnDG.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.DKGRAY); dialog.dismiss(); } }); } if (btnGR != null) { btnGR.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.GRAY); dialog.dismiss(); } }); } if (btnGRE != null) { btnGRE.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.GREEN); dialog.dismiss(); } }); } if (btnLG != null) { btnLG.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.LTGRAY); dialog.dismiss(); } }); } if (btnMG != null) { btnMG.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.MAGENTA); dialog.dismiss(); } }); } if (btnRD != null) { btnRD.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.RED); dialog.dismiss(); } }); } if (btnYE != null) { btnYE.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); view.paint.setColor(Color.YELLOW); dialog.dismiss(); } }); } dialog.show(); } </code></pre> <p>I have to repeat the following code for each color because once I draw something and change color and draw something else, all the previous drawn path changes to the new color and this code fixed it:</p> <pre><code> layout = (FrameLayout)findViewById(R.id.viewd); //layout.removeAllViews(); view = new CustomView(FreeDraw.this); view.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT)); layout.addView(view); </code></pre> <p>My save image portion of the code in the Activity is:</p> <pre><code>View.OnClickListener saveHandle = new View.OnClickListener() { public void onClick(View v) { new SaveImageTask().execute(null, null, null); } }; public class SaveImageTask extends AsyncTask&lt;Void, Void, Void&gt; { @Override protected Void doInBackground(Void... params) { //Running in background View content = layout; content.setDrawingCacheEnabled(true); content.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH); Bitmap bitmap = content.getDrawingCache(); File folder = new File(Environment.getExternalStorageDirectory() + "/PB"); if (!folder.exists()) { folder.mkdir(); } file = new File(folder + "/pb_image_" + Math.random() + ".png"); FileOutputStream ostream; try { file.createNewFile(); ostream = new FileOutputStream(file); bitmap.compress(CompressFormat.PNG, 100, ostream); ostream.flush(); ostream.close(); isSaved = true; } catch (Exception e) { e.printStackTrace(); isSaved = false; } return null; } @Override protected void onPreExecute() { //Activity is on progress //displayToast("Your image is saving..."); btnSave.setVisibility(View.GONE); btnShare.setVisibility(View.GONE); pb.setVisibility(View.VISIBLE); } @Override protected void onPostExecute(Void v) { //Activity is done... if (isSaved == true) { displayToast("Image was saved."); btnSave.setVisibility(View.GONE); btnShare.setVisibility(View.VISIBLE); pb.setVisibility(View.GONE); } if (isSaved == false) { displayToast("Unable to save image. Try again later."); btnSave.setVisibility(View.VISIBLE); btnShare.setVisibility(View.GONE); pb.setVisibility(View.GONE); } } } </code></pre> <p>What I am looking to do is:</p> <ul> <li>When I draw something and SAVE the image, the SHARE button should appear and the Canvas shouldn't clear (working)</li> <li>While the SHARE button is visible I draw something else on the canvas the SAVE button should reappear (working)</li> <li>When I press the SAVE button again it should save the new canvas drawings (<strong>Not working, it is saving the previously drawn canvas which I saved in the first step</strong>)</li> </ul> <p><strong>How can I modify my codes to do this</strong>:</p> <ul> <li><strong><s>Do not create new canvas for each color, rather create new paths.</s></strong></li> <li><strong>Once the drawing on the canvas is saved, and I draw something new on top of the existing canvas and save. The new canvas should be saved with all the old and new drawn paths</strong></li> <li><strong><s>Clear the entire canvas if ERASE button is pressed</s></strong></li> </ul>
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