android.graphics.drawable.ColorDrawable#draw()源码实例Demo

public IcsColorDrawable(ColorDrawable drawable) {
    Bitmap bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bitmap);
    drawable.draw(c);
    this.color = bitmap.getPixel(0, 0);
    bitmap.recycle();
}
 

@ColorInt
public static int getDrawableColor(ColorDrawable colorDrawable) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        return colorDrawable.getColor();
    } else {
        // http://stackoverflow.com/questions/15982044/get-activity-background-color-in-android-api-level-8
        Bitmap bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_4444);
        Canvas canvas = new Canvas(bitmap);
        colorDrawable.draw(canvas);
        final int color = bitmap.getPixel(0, 0);
        bitmap.recycle();
        return color;
    }
}
 

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static int getColorDrawableColor(ColorDrawable drawable) {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
        Bitmap bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_4444);
        Canvas canvas = new Canvas(bitmap);
        drawable.draw(canvas);
        int pix = bitmap.getPixel(0, 0);
        bitmap.recycle();
        return pix;
    } else {
        return drawable.getColor();
    }
}
 

public IcsColorDrawable(ColorDrawable drawable) {
    Bitmap bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bitmap);
    drawable.draw(c);
    this.color = bitmap.getPixel(0, 0);
    bitmap.recycle();
}
 

public IcsColorDrawable(ColorDrawable drawable) {
    Bitmap bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bitmap);
    drawable.draw(c);
    this.color = bitmap.getPixel(0, 0);
    bitmap.recycle();
}
 

public IcsColorDrawable(ColorDrawable drawable) {
    Bitmap bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
    Canvas c = new Canvas(bitmap);
    drawable.draw(c);
    this.color = bitmap.getPixel(0, 0);
    bitmap.recycle();
}
 

@Override
protected void onDraw(Canvas canvas) {
    if (!mIsDragTarget) {
        return;
    }

    // When we're large, we are either drawn in a "hover" state (ie when dragging an item to
    // a neighboring page) or with just a normal background (if backgroundAlpha > 0.0f)
    // When we're small, we are either drawn normally or in the "accepts drops" state (during
    // a drag). However, we also drag the mini hover background *over* one of those two
    // backgrounds
    if (mBackgroundAlpha > 0.0f) {
        mBackground.draw(canvas);
    }

    final Paint paint = mDragOutlinePaint;
    for (int i = 0; i < mDragOutlines.length; i++) {
        final float alpha = mDragOutlineAlphas[i];
        if (alpha > 0) {
            final Bitmap b = (Bitmap) mDragOutlineAnims[i].getTag();
            paint.setAlpha((int)(alpha + .5f));
            canvas.drawBitmap(b, null, mDragOutlines[i], paint);
        }
    }

    if (DEBUG_VISUALIZE_OCCUPIED) {
        int[] pt = new int[2];
        ColorDrawable cd = new ColorDrawable(Color.RED);
        cd.setBounds(0, 0,  mCellWidth, mCellHeight);
        for (int i = 0; i < mCountX; i++) {
            for (int j = 0; j < mCountY; j++) {
                if (mOccupied.cells[i][j]) {
                    cellToPoint(i, j, pt);
                    canvas.save();
                    canvas.translate(pt[0], pt[1]);
                    cd.draw(canvas);
                    canvas.restore();
                }
            }
        }
    }

    for (int i = 0; i < mFolderBackgrounds.size(); i++) {
        FolderIcon.PreviewBackground bg = mFolderBackgrounds.get(i);
        cellToPoint(bg.delegateCellX, bg.delegateCellY, mTempLocation);
        canvas.save();
        canvas.translate(mTempLocation[0], mTempLocation[1]);
        bg.drawBackground(mLauncher, canvas);
        if (!bg.isClipping) {
            bg.drawBackgroundStroke(mLauncher, canvas);
        }
        canvas.restore();
    }

    if (mFolderLeaveBehind.delegateCellX >= 0 && mFolderLeaveBehind.delegateCellY >= 0) {
        cellToPoint(mFolderLeaveBehind.delegateCellX,
                mFolderLeaveBehind.delegateCellY, mTempLocation);
        canvas.save();
        canvas.translate(mTempLocation[0], mTempLocation[1]);
        mFolderLeaveBehind.drawLeaveBehind(canvas);
        canvas.restore();
    }
}