3

我正在使用以下代码。我在保存图像时遇到问题。我可以保存位图但是当保存双图时它也保存了我也用黑色擦除了油漆

public class FingerPaint extends GraphicsActivity
    implements ColorPickerDialog.OnColorChangedListener {    

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new MyView(this));

    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);

    mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                                   0.4f, 6, 3.5f);

    mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
}

private Paint       mPaint;
private MaskFilter  mEmboss;
private MaskFilter  mBlur;

public void colorChanged(int color) {
    mPaint.setColor(color);
}

public class MyView extends View {

    private static final float MINP = 0.25f;
    private static final float MAXP = 0.75f;

    private Bitmap  mBitmap;
    private Canvas  mCanvas;
    private Path    mPath;
    private Paint   mBitmapPaint;

    public MyView(Context c) {
        super(c);

        mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
        mPath = new Path();
        mBitmapPaint = new Paint(Paint.DITHER_FLAG);
    }

    @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;
    }
}

private static final int COLOR_MENU_ID = Menu.FIRST;
private static final int EMBOSS_MENU_ID = Menu.FIRST + 1;
private static final int BLUR_MENU_ID = Menu.FIRST + 2;
private static final int ERASE_MENU_ID = Menu.FIRST + 3;
private static final int SRCATOP_MENU_ID = Menu.FIRST + 4;

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);

    menu.add(0, COLOR_MENU_ID, 0, "Color").setShortcut('3', 'c');
    menu.add(0, EMBOSS_MENU_ID, 0, "Emboss").setShortcut('4', 's');
    menu.add(0, BLUR_MENU_ID, 0, "Blur").setShortcut('5', 'z');
    menu.add(0, ERASE_MENU_ID, 0, "Erase").setShortcut('5', 'z');
    menu.add(0, SRCATOP_MENU_ID, 0, "SrcATop").setShortcut('5', 'z');

    /****   Is this the mechanism to extend with filter effects?
    Intent intent = new Intent(null, getIntent().getData());
    intent.addCategory(Intent.CATEGORY_ALTERNATIVE);
    menu.addIntentOptions(
                          Menu.ALTERNATIVE, 0,
                          new ComponentName(this, NotesList.class),
                          null, intent, 0, null);
    *****/
    return true;
}

@Override
public boolean onPrepareOptionsMenu(Menu menu) {
    super.onPrepareOptionsMenu(menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    mPaint.setXfermode(null);
    mPaint.setAlpha(0xFF);

    switch (item.getItemId()) {
        case COLOR_MENU_ID:
            new ColorPickerDialog(this, this, mPaint.getColor()).show();
            return true;
        case EMBOSS_MENU_ID:
            if (mPaint.getMaskFilter() != mEmboss) {
                mPaint.setMaskFilter(mEmboss);
            } else {
                mPaint.setMaskFilter(null);
            }
            return true;
        case BLUR_MENU_ID:
            if (mPaint.getMaskFilter() != mBlur) {
                mPaint.setMaskFilter(mBlur);
            } else {
                mPaint.setMaskFilter(null);
            }
            return true;
        case ERASE_MENU_ID:
            mPaint.setXfermode(new PorterDuffXfermode(
                                                    PorterDuff.Mode.CLEAR));
            return true;
        case SRCATOP_MENU_ID:
            mPaint.setXfermode(new PorterDuffXfermode(
                                                PorterDuff.Mode.SRC_ATOP));
            mPaint.setAlpha(0x80);
            return true;
    }
    return super.onOptionsItemSelected(item);
   }
  }
4

2 回答 2

3

我对您的代码进行了一些更改，并且可以正常工作。我还添加了一个保存选项。 

public class FingerPaintActivity extends GraphicsActivity implements ColorPickerDialog.OnColorChangedListener {    

MyView mv;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   mv= new MyView(this);
   mv.setDrawingCacheEnabled(true);
   setContentView(mv);
   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);

   mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                           0.4f, 6, 3.5f);

   mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
   }

   private Paint       mPaint;
   private MaskFilter  mEmboss;
   private MaskFilter  mBlur;

   public void colorChanged(int color) {
   mPaint.setColor(color);
   }

   public class MyView extends View {

   private static final float MINP = 0.25f;
   private static final float MAXP = 0.75f;

   private Bitmap  mBitmap;
   private Canvas  mCanvas;
   private Path    mPath;
   private Paint   mBitmapPaint;
   Context context;

   public MyView(Context c) {
    super(c);
    context=c;

  //mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);


   mPath = new Path();
   mBitmapPaint = new Paint(Paint.DITHER_FLAG);
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
  mCanvas = new Canvas(mBitmap);
  }

 @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();
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
mPaint.setMaskFilter(null);
}

@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;
}
}

 private static final int COLOR_MENU_ID = Menu.FIRST;
 private static final int EMBOSS_MENU_ID = Menu.FIRST + 1; 
 private static final int BLUR_MENU_ID = Menu.FIRST + 2;
 private static final int ERASE_MENU_ID = Menu.FIRST + 3;
 private static final int SRCATOP_MENU_ID = Menu.FIRST + 4;
 private static final int Save = Menu.FIRST + 5;

 @Override 
  public boolean onCreateOptionsMenu(Menu menu) {
  super.onCreateOptionsMenu(menu);

    menu.add(0, COLOR_MENU_ID, 0, "Color").setShortcut('3', 'c');
    menu.add(0, EMBOSS_MENU_ID, 0, "Emboss").setShortcut('4', 's');
    menu.add(0, BLUR_MENU_ID, 0, "Blur").setShortcut('5', 'z');
    menu.add(0, ERASE_MENU_ID, 0, "Erase").setShortcut('5', 'z');
    menu.add(0, SRCATOP_MENU_ID, 0, "SrcATop").setShortcut('5', 'z');
    menu.add(0, Save, 0, "Save").setShortcut('5', 'z');

     /****   Is this the mechanism to extend with filter effects?
     Intent intent = new Intent(null, getIntent().getData());
     intent.addCategory(Intent.CATEGORY_ALTERNATIVE);
     menu.addIntentOptions(
                  Menu.ALTERNATIVE, 0,
                  new ComponentName(this, NotesList.class),
                  null, intent, 0, null);
      *****/
      return true;
      }

      @Override
       public boolean onPrepareOptionsMenu(Menu menu) {
       super.onPrepareOptionsMenu(menu);
        return true;
        }

@Override
public boolean onOptionsItemSelected(MenuItem item) {
mPaint.setXfermode(null);
mPaint.setAlpha(0xFF);

switch (item.getItemId()) {
case COLOR_MENU_ID:
    new ColorPickerDialog(this, this, mPaint.getColor()).show();
    return true;
case EMBOSS_MENU_ID:
    if (mPaint.getMaskFilter() != mEmboss) {
        mPaint.setMaskFilter(mEmboss);
    } else {
        mPaint.setMaskFilter(null);
    }
    return true;
case BLUR_MENU_ID:
    if (mPaint.getMaskFilter() != mBlur) {
        mPaint.setMaskFilter(mBlur);
    } else {
        mPaint.setMaskFilter(null);
    }
    return true;
case ERASE_MENU_ID:
    mPaint.setXfermode(new PorterDuffXfermode(
                                            PorterDuff.Mode.CLEAR));
    return true;
case SRCATOP_MENU_ID:

    mPaint.setXfermode(new PorterDuffXfermode(
                                        PorterDuff.Mode.SRC_ATOP));
    mPaint.setAlpha(0x80);
    return true;
case Save:
    AlertDialog.Builder editalert = new AlertDialog.Builder(FingerPaintActivity.this);
        editalert.setTitle("Please Enter the name with which you want to Save");
        final EditText input = new EditText(FingerPaintActivity.this);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.FILL_PARENT,
                LinearLayout.LayoutParams.FILL_PARENT);
        input.setLayoutParams(lp);
        editalert.setView(input);
        editalert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int whichButton) {

            String name= input.getText().toString();
            Bitmap bitmap = mv.getDrawingCache();

         String path = Environment.getExternalStorageDirectory().getAbsolutePath(); 
            File file = new File("/sdcard/"+name+".png");           
            try 
            {
                if(!file.exists())
            {
                file.createNewFile();
            }
                FileOutputStream ostream = new FileOutputStream(file);
                bitmap.compress(CompressFormat.PNG, 10, ostream);
                    System.out.println("saving......................................................"+path);
                ostream.close();
                mv.invalidate();                            
            } 
            catch (Exception e) 
            {
                e.printStackTrace();
            }finally
            {

                mv.setDrawingCacheEnabled(false);                           
            }
            }
        });

        editalert.show();       
    return true;    
}
 return super.onOptionsItemSelected(item);
}
}

编辑 ：

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.afor);
mCanvas.drawBitmap(bmp, 0, 0, mPaint);
}
于 2013-04-03T15:52:29.447 回答
2 
    mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
    mCanvas = new Canvas(mBitmap);

去掉上面的。使用下面的。您可以使用全屏进行绘制。

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
    mCanvas = new Canvas(mBitmap);  
   }
于 2013-04-03T17:22:25.330 回答