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POUndo and redo button not working
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copied!<p>I am working on Paint App and The app is working perfectly.So now suppose I want to draw something like making painting of someone else.So I draw wrong in this painting so now I want to go back means previous(past) step then I want undo button which is not working perfectly .this is my code tell me where I am wrong.please help. package com.example.paint;</p> <pre><code>import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.Date; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.os.Bundle; import android.os.Environment; import android.util.DisplayMetrics; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.widget.Button; import android.widget.FrameLayout; import android.widget.Toast; import com.example.paint.ColorPickerDialog.OnColorChangedListener; public class Main extends Activity { public static ArrayList<Path> mMaindialog; private FrameLayout relativelayout; static String sdpath; // Instance variables private Paint mPaint, mBitmapPaint; private MyView mView; private Bitmap mBitmap; private Canvas mCanvas; private Path mPath; private Button ClearPaint, Colorpaint; Ghostdatabase gost; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); relativelayout = (FrameLayout) findViewById(R.id.frameLayout); //relativelayout.addView(mView); DisplayMetrics metrics = getBaseContext().getResources() .getDisplayMetrics(); int w = metrics.widthPixels; int h = metrics.heightPixels; System.out.println(" width " + w); System.out.println(" height " + h); mView = new MyView(this, w, h); mView.setDrawingCacheEnabled(true); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(Color.BLACK); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(5); ClearPaint = (Button) findViewById(R.id.ne); ClearPaint.setOnClickListener(new OnClickListener() { public void onClick(View v) { // mBitmap.eraseColor(Color.TRANSPARENT); // mPath.reset(); // mView.invalidate(); mView.onClickUndo(); } }); Button save22 = (Button) findViewById(R.id.save); save22.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub File cacheDir; Toast.makeText(Main.this, "Photo", 500) .show(); Bitmap icon; relativelayout.setDrawingCacheEnabled(true); icon = Bitmap.createBitmap(relativelayout.getDrawingCache()); Bitmap bitmap = icon; relativelayout.setDrawingCacheEnabled(false); //File mFile1 = Environment.getExternalStorageDirectory(); Date d=new Date(); String fileName = d.getTime()+"mg1.jpg"; File storagePath = (Environment .getExternalStorageDirectory()); File dest = new File(storagePath + "/CityAppImages"); if (!dest.exists()) { dest.mkdirs(); } File mFile2 = new File(dest, fileName); sdpath= mFile2.getAbsolutePath(); Log.d("qqqqqqqqqqqqqqqqqqqqqqq", "zzzzzzzz" + sdpath); try { FileOutputStream outStream; outStream = new FileOutputStream(mFile2); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream); outStream.flush(); outStream.close(); Toast.makeText(Main.this, "Photo Saved Sucessfully", 500) .show(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); Toast.makeText(Main.this, "Photo Not Saved Sucessfully", 500).show(); } gost = new Ghostdatabase(Main.this); gost.open(); gost.insertTitle(sdpath); } }); Button view = (Button) findViewById(R.id.listtt); view.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent ii = new Intent(Main.this,ListView5.class); startActivity(ii); } }); Button Colorpaint = (Button) findViewById(R.id.Color); Colorpaint.setOnClickListener(new OnClickListener() { public void onClick(View v) { //int _color = R.color.red; new ColorPickerDialog(v.getContext(), new OnColorChangedListener() { public void colorChanged(int color) { mPaint.setColor(color); Log.i("TAG", "mpaint one" + mPaint); } }, mPaint.getColor()).show(); Log.i("TAG", "mpaint two" + mPaint); } }); relativelayout.addView(mView); } /* * /// color changed function, getting value from ColorPickerDialog /// * public void colorChanged(int color) { mPaint.setColor(color); } */ // //////////******************* Pinting view // *******************/////////////////// // public class MyView extends View { // private ArrayList<Path> mMaindialog = new ArrayList<Path>(); // private ArrayList<Path> undonePaths = new ArrayList<Path>(); // // public MyView(Context c, int w, int h) { // super(c); // //image_name=mMaindialog.get(position).imagename; // mBitmap = BitmapFactory.decodeResource(getResources(),R.drawable.base); // i // // Bitmap mBitmap = // // Bitmap.createScaledBitmap(originalBitmap,200,200,true); // mCanvas = new Canvas(mBitmap); // mPath = new Path(); // //mBitmapPaint = new Paint(Paint.DITHER_FLAG); // //mBitmapPaint // //.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); // } // // @Override // protected void onSizeChanged(int w, int h, int oldw, int oldh) { // super.onSizeChanged(w, h, oldw, oldh); // // mBitmap = Bitmap.createBitmap(bw, bh, Bitmap.Config.ARGB_8888); // // mCanvas = new Canvas(mBitmap); // } // // @Override // protected void onDraw(Canvas canvas) { // canvas.drawColor(Color.TRANSPARENT); // canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); // canvas.drawPath(mPath, mPaint); // for (Path p : mMaindialog){ // canvas.drawPath(p, mPaint); // } // } // // // //////************touching evants for painting**************/////// // private float mX, mY; // private static final float TOUCH_TOLERANCE = 5; // // 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(); // mMaindialog.add(mPath); // } // // @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; // } // end of touch events for image // // public void onClickUndo () { // if (mMaindialog.size()>0) // { // undonePaths.add(mMaindialog.remove(mMaindialog.size()-1)); // invalidate(); // } // else // { // // } // //toast the user // } // // public void onClickRedo (){ // if (undonePaths.size()>0) // { // mMaindialog.add(undonePaths.remove(undonePaths.size()-1)); // invalidate(); // } // else // { // // } // //toast the user // } // }// end MyView public class MyView extends View implements OnTouchListener { private ArrayList<Path> mMaindialog = new ArrayList<Path>(); private ArrayList<Path> undonePaths = new ArrayList<Path>(); private Bitmap im; public MyView(Context context, int w, int h) { super(context); setFocusable(true); setFocusableInTouchMode(true); this.setOnTouchListener(this); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); mPaint.setColor(0xFFFFFFFF); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStrokeWidth(4); mCanvas = new Canvas(); mPath = new Path(); // paths.add(mPath); im=BitmapFactory.decodeResource(context.getResources(),R.drawable.base); im = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); mCanvas = new Canvas(im); mPath = new Path(); } @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(Color.TRANSPARENT); canvas.drawBitmap(im, 0, 0, mBitmapPaint); canvas.drawPath(mPath, mPaint); for (Path p : mMaindialog){ canvas.drawPath(p, 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 = new Path(); mMaindialog.add(mPath); } public void onClickUndo () { if (mMaindialog.size()>0) { undonePaths.add(mMaindialog.remove(mMaindialog.size()-1)); invalidate(); Log.d("","undonePaths"+ undonePaths); } else { } //toast the user } public void onClickRedo (){ if (undonePaths.size()>0) { mMaindialog.add(undonePaths.remove(undonePaths.size()-1)); invalidate(); } else { } //toast the user } @Override public boolean onTouch(View arg0, 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; } } } </code></pre>

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