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POAndroid MapView Bitmap Problem
 

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  1. POAndroid MapView Bitmap Problem
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    <p>The following Code should speed up my MapView because I'm handling a large set of routes. Unfortunately the "else" part does not draw anything. Could somebody help me to understand this. Thx</p> <pre><code> public boolean draw(Canvas canvas, MapView mapv, boolean shadow, long when) { if ((bmap == null) || (lastLatSpan != mapv.getLatitudeSpan())) { // bitmap is null - so we haven't previously drawn the path, OR // the map has been zoomed in/out, so we're gonna re-draw it anyway // (alternatively, I could have tried scaling the bitmap... might // be worth investigating if that is more efficient) // create a new bitmap, the size of the map view Canvas offscreencanvas = new Canvas(); bmap = Bitmap.createBitmap(mapv.getWidth(), mapv.getHeight(), Bitmap.Config.ARGB_8888); offscreencanvas.setBitmap(bmap); Path path = null; Projection projection = mapv.getProjection(); // lastLatSpan = mapv.getLatitudeSpan(); for (int j = 0; j &lt; mTourenArray.length; j++) { GeoPoint[] route = GeoPointFactory .createGeoPointArray(mTourenArray[j].getGeoPointArray()); defaultColor = mTourenArray[j].getColorByCat(); path = new Path(); Paint polyPaint = new Paint(); polyPaint.setColor(defaultColor); for (int i = 0; i &lt; route.length - 1; i++) { GeoPoint gp1 = route[i]; GeoPoint gp2 = route[i + 1]; if (shadow == false) { polyPaint.setAntiAlias(true); Point point = new Point(); projection.toPixels(gp1, point); // mode=1&amp;#65306;start if (i == 0) { RectF oval = new RectF(point.x - mRadius, point.y - mRadius, point.x + mRadius, point.y + mRadius); // start point canvas.drawOval(oval, polyPaint); Point point2 = new Point(); projection.toPixels(gp2, point2); path.moveTo(point.x, point.y); path.lineTo(point2.x, point2.y); } /* mode=3&amp;#65306;end */ else if (i == route.length - 2) { /* the last path */ Point point2 = new Point(); projection.toPixels(gp2, point2); path.lineTo(point2.x, point2.y); RectF oval = new RectF(point2.x - mRadius, point2.y - mRadius, point2.x + mRadius, point2.y + mRadius); /* end point */ polyPaint.setAlpha(255); offscreencanvas.drawOval(oval, polyPaint); } // mode=2&amp;#65306;path else if (i &lt; route.length - 2 &amp; i != 0) { Point point2 = new Point(); projection.toPixels(gp2, point2); path.lineTo(point2.x, point2.y); } } } // create an off-screen canvas to prepare new bitmap, and // draw path on to it polyPaint.setStrokeWidth(5); polyPaint.setStyle(Paint.Style.STROKE); polyPaint.setAntiAlias(true); polyPaint .setAlpha(defaultColor == Color.parseColor("#6C8715") ? 220 : 120); offscreencanvas.drawPath(path, polyPaint); } // Outer For End // draw the bitmap of the path onto my map view's canvas canvas.drawBitmap(bmap, 0, 0, null); // make a note of where we put the bitmap, so we know how // much we // we need to move it by if the user pans the map mapStartPosition = projection.fromPixels(0, 0); } else { // as we're in onDraw, we think the user has panned/moved the map // if we're in here, the zoom level hasn't changed, and // we've already got a bitmap with a drawing of the route path Projection proj = mapv.getProjection(); // where has the mapview been panned to? Point offsetPt = new Point(); proj.toPixels(mapStartPosition, offsetPt); Paint tmpPaint = new Paint(); // create a new bitmap, the size of the map view // draw the bitmap in the new correct location canvas.drawBitmap(bmap, offsetPt.x, offsetPt.y, tmpPaint); } return super.draw(canvas, mapv, shadow, when); } </code></pre>
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