Question

嘿我在我的Android应用程序中将谷歌地图制作者定制为图像，它工作正常，但目前加载标记需要时间，因为200左右有很多标记。实际上，我从后端获取图像（解析） .com）然后裁剪它以适合标记形状。

有没有办法更快地加载标记？

＆＃13;

 View marker2 = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.marker, null);
 ImageView numTxt = (ImageView) marker2.findViewById(R.id.num_txt);

Bitmap bitmap1 = getBitmap(url1, MapActivity.this);
numTxt.setImageBitmap(bitmap1);

markerOpts = markerOpts.title("Company").snippet("branch").icon(BitmapDescriptorFactory.fromBitmap(createDrawableFromView(MapActivity.this, marker2)));



public static Bitmap getBitmap(String url2, Context context) {
		FileCache fileCache = new FileCache(context);
		MemoryCache memoryCache = new MemoryCache();
		File f = fileCache.getFile(url2);
		//from SD cache
		//CHECK : if trying to decode file which not exist in cache return null
		Bitmap b = decodeFile(f);
		if (b != null)
			return b;
		// Download image file from web
		try {
			Bitmap bitmap = null;
			URL imageUrl = new URL(url2);
			HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
			conn.setConnectTimeout(30000);
			conn.setReadTimeout(30000);
			conn.setInstanceFollowRedirects(true);
			InputStream is = conn.getInputStream();
			// Constructs a new FileOutputStream that writes to file
			// if file not exist then it will create file
			OutputStream os = new FileOutputStream(f);
			// See Utils class CopyStream method
			// It will each pixel from input stream and
			// write pixels to output stream (file)
			Utils.CopyStream(is, os);
			os.close();
			conn.disconnect();
			//Now file created and going to resize file with defined height
			// Decodes image and scales it to reduce memory consumption
			b = decodeFile(f);
			return bitmap;

		} catch (Throwable ex) {
			ex.printStackTrace();
			if (ex instanceof OutOfMemoryError)
				memoryCache.clear();
			return null;
		}
	}


public static Bitmap createDrawableFromView(Context context, View view) {
		DisplayMetrics displayMetrics = new DisplayMetrics();
		((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
		view.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
		view.measure(displayMetrics.widthPixels, displayMetrics.heightPixels);
		view.layout(0, 0, displayMetrics.widthPixels, displayMetrics.heightPixels);
		view.buildDrawingCache();
		Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);

		Canvas canvas = new Canvas(bitmap);
		view.draw(canvas);

		return bitmap;
	}

＆＃13;

Answer 1

是的，有。你肯定知道你需要这些照片，所以要以一种不突兀的方式做到这一点。在初始化时将它们加载到背景一次。加载一次后，只需在本地环境中使用它们即可。所以，改进：

请求图片并在后台线程中解析它们，同时初始化软件以免打扰用户
成功提取图片后存储图片并在本地重复使用而不是重新请求图片

Answer 2

您可以使用图片下载库Picasso。它将处理图像下载和缓存，内存使用，您可以将图像裁剪为您需要的任何大小。如果您多次加载相同的图像（您可能会做什么）毕加索将使用缓存图像而不是每次下载它，这样可以加快所有图像下载过程。

要使用此库，您需要在Android Studio中项目的build.gradle文件夹的app文件的依赖关系树中声明它，所以它看起来像这样：

dependencies {

//some other dependencies
//...
compile 'com.squareup.picasso:picasso:2.5.2'//add this line
}

然后在代码中使用它：

Picasso.with(MapActivity.this).load(url1).into(numTxt);

加载许多制造商谷歌地图

2 个答案: