分层图像加上帆布 [英] layered images plus canvas

问题描述

我想打好两张图在彼此的顶部。最上面的一个是透明的。在上面我试图添加一个透明画布，使用户可以得出，类型，无论他们需要做的，底部的两个图像是可见的。

I am trying to lay two picture on top of each other. Top one is transparent. On top of them I am trying to add a transparent canvas so the user can draw, type, whatever they need to do and the bottom two images are visible.

所以我可以得到两个图像显示出来，或只是在画布上。每次我试图显示它似乎在画布上喜欢它，是对[两个图像覆盖其中的第

So I can get the two images to show up or just the canvas. Everytime I try to display the canvas it seems like it is on to[p of the two images covering them.

下面是我迄今为止..

Here is what I have so far..

 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);        
    setContentView(new MyView(this));

..... some code to set up the paint
}

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

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);                       

            // Creating a new relative layout add the definition again.       
            RelativeLayout relativeLayout = new RelativeLayout(TwoPicksOnEachOther.this);                   
            // Setting the orientation to vertical         
            ////relativeLayout.setOrientation(LinearLayout.VERTICAL);                   

            // Creating Fish  image       
            final ImageView iv = new ImageView(TwoPicksOnEachOther.this);         
            iv.setImageResource(R.drawable.fish2);
            // relative layout parameters
            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(     
                    RelativeLayout.LayoutParams.FILL_PARENT, 
                    RelativeLayout.LayoutParams.FILL_PARENT);        
            //iv.setId(1);                          
            relativeLayout.addView(iv,lp);        

            // Creating transparent image with boat.
            final ImageView iv2 = new ImageView(TwoPicksOnEachOther.this);
            iv2.setImageResource(R.drawable.ctdeasytwo);
            //iv2.setId(2);
            RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(     
                    RelativeLayout.LayoutParams.FILL_PARENT, 
                    RelativeLayout.LayoutParams.FILL_PARENT);
            relativeLayout.addView(iv2,lp2);     

            mBitmap = Bitmap.createBitmap(480, 800, Bitmap.Config.ARGB_8888); 
            //mBitmap = BitmapFactory.decodeResource(getResources(),
            //        R.drawable.ctdeasytwo);                      
            mCanvas = new Canvas(mBitmap);
           // mCanvas.drawBitmap(mBitmap, 10, 10, null);
            mPath = new Path();
            mBitmapPaint = new Paint(Paint.DITHER_FLAG);

        }

        @Override
        protected void onDraw(Canvas canvas) {
            canvas.drawColor(Color.TRANSPARENT);

            canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);  

            canvas.drawPath(mPath, mPaint);
        }

................... More code to manage touch events.

现在我怀疑画布是不是相对布局的一部分。莫非是问题吗？如果是的话，我不能做relativeLayout.addView（mCanvas，LP）;

Now I am suspecting that the canvas is not part of the relative layout. Could that be the problem? If yes, I can't do relativeLayout.addView(mCanvas,lp);

有什么建议？

推荐答案

对不起不得不等待八个小时回答我的问题。

Sorry had to wait eight hours to answer my own question.

我能解决这个问题。我创建了一个类。

I was able to fix the problem. I created a class.

public class newClass extends View { 
public newClass (Context context){ super(context); } 
... 
@Override protected void onDraw(Canvas canvas) { 
canvas.drawColor(Color.TRANSPARENT); } 

然后，所有我必须做的。

Then all I had to do

final newClass myCanvas = new newClass (this); 

relativeLayout.addView(myCanvas,lp2); 

做工精细...

Works fine...

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