Problems with drawing custom background on Canvas (Android)

Question

I'm trying to draw custom background to my CustomView which extends LinearLayout.

Here is my onDraw() method:

int mPositionX = 0;
int mPositionY = 0;
final int viewWidth = getMeasuredWidth();
final int viewHeight = getMeasuredHeight();

mPath.moveTo(mPositionX, mPositionY);
mPositionX = viewWidth;
mPath.lineTo(mPositionX, mPositionY);
mPositionY = viewHeight;
mPath.lineTo(mPositionX, mPositionY);

//draw bottom triangles
for(int i = 0; mPositionX >= 0; i++){
    mPositionX -= HALF_BORDER_STEP;
    mPositionY = i%2 == 0 ? mPositionY - BORDER_HEIGHT : mPositionY + BORDER_HEIGHT;
    mPath.lineTo(mPositionX, mPositionY);
}

// move to left bottom corner
mPositionX = 0;
mPath.lineTo(mPositionX,mPositionY);
mPath.close();

canvas.clipPath(mPath);
canvas.drawPath(mPath, mCheckPaint);
super.draw(canvas);

I have 2 problems.

First of all my custom background does not shown if i won't set any background, so i did android:background="@color/transparent" in my xml.

Second problem is that, after i add some views via .addView(View view) , my background disappeares.

I have tried to call invalidate() but still nothing.

What do i do wrong?

Answer 1

To solve my problem i should have added setWillNotDraw(false); which means that my View does drawing on its own. Android Dev Docs. After this I missed one more method calling: mPath.reset(); just before redrawin in my onDraw(Canvas canvas); That's it.