我的应用使用geojson在地图上绘制功能。绘制功能:
for (GeoJsonFeature f : new GeoJsonLayer(googleMap, new JSONObject(geojson)).getFeatures())
{
f.setPointStyle(getPointStyle(text,status);
layer.addFeature(f);
}
layer.addLayerToMap();
生成点(标记)样式并设置图标:
GeoJsonPointStyle markerStyle = new GeoJsonPointStyle();
int[] markers = {R.drawable.marker0,R.drawable.marker1,R.drawable.marker2,R.drawable.marker3,R.drawable.marker4};
bmp = Utils.drawTextToBitmap(getContext(), markers[status], icon);
markerStyle.setIcon(highlighted ? BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN):BitmapDescriptorFactory.fromBitmap(bmp));
drawTextToBitmap
只生成包含文字的位图:
public static Bitmap drawTextToBitmap(Context gContext, int gResId, String gText)
{
Resources resources = gContext.getResources();
float scale = resources.getDisplayMetrics().density;
Bitmap bitmap = BitmapFactory.decodeResource(resources, gResId);
android.graphics.Bitmap.Config bitmapConfig = bitmap.getConfig();
if (bitmapConfig == null)
{
bitmapConfig = android.graphics.Bitmap.Config.ARGB_8888;
}
bitmap = bitmap.copy(bitmapConfig, true);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.WHITE);
paint.setTextSize((int) (18 * scale));
Typeface tf = Typeface.createFromAsset(gContext.getAssets(), "fonts/fontawesome.ttf");
paint.setTypeface(Typeface.create(tf, Typeface.BOLD));
paint.setShadowLayer(1f, 0f, 1f, Color.WHITE);
Rect bounds = new Rect();
paint.getTextBounds(gText, 0, gText.length(), bounds);
int x = (bitmap.getWidth() - bounds.width()) / 2;
int y = (bitmap.getHeight() + bounds.height()) / 2 -8;
canvas.drawText(gText, x, y, paint);
return bitmap;
}
我的问题是,在某些手机上(不是在每部手机上),如果在地图上绘制大量标记,这种方法会导致巨大的内存泄漏。如果我使用静态标记从资源中绘制,则问题不存在,但我需要动态位图来在其上添加文本。
你对内存泄漏原因有什么看法吗?似乎map保存位图引用,因此它可以防止垃圾处理它。即使地图片段被破坏,地图资源也永远不会被释放,因此在几次显示地图后,由于OutOfMemory异常,app停止工作。