android Bitmap

[jain110]

Android 中Bitmap对象如何使用decodeStream生成缩略图？
在网上看了好多都是用decodeFile这种方式生成的。 谁可以告知一下？

[danielinbiti]

decodeFile没有从网络解码图片的能力

[jain110]

BitmapFactory.Options options = new BitmapFactory.Options();
     //options.inSampleSize = 3;
     options.outHeight = 200;
     options.inJustDecodeBounds = true;
     //options.
     if (position < 0) {

      position = position + mImageDirs.size();

     }
     // 获取这个图片的宽和高
     Bitmap bm = BitmapFactory.decodeFile(this.mImageDirs
       .get(position % mImageDirs.size()), options); //此时返回bm为空
     options.inJustDecodeBounds = false;
     int be = options.outHeight / 20;
     if(be%10 !=0)
      be+=10;
     be=be/10;
     if (be <= 0)
      be = 1;
     options.inSampleSize = be;
     bm = BitmapFactory.decodeFile(this.mImageDirs.get(position
       % mImageDirs.size()), options);

这里使用decodeFile生成的缩略图，我希望用decodeStream的方式来生成缩略图

[j_f0001]

public static Bitmap getBitmapByUrl(HttpGet httpGet,String strurl, int displayWidth,
			int displayHeight) throws IOException, URISyntaxException {
		URL url = new URL(strurl);
		getHttpClient();
		
		httpGet.setURI(new URI(strurl));
		
		HttpResponse response = httpClient.execute(httpGet);
		InputStream ins=null;
		if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
			ins=response.getEntity().getContent();
		}
		else
			return null;
		//url.openConnection().setDefaultUseCaches(true);
		Options options = new Options();		
		options.inJustDecodeBounds = true;

		Bitmap bitmap = BitmapFactory.decodeStream(ins, null, options);
		int srcWidth = options.outWidth;
		ins.close();
		ins = null;
		options.inJustDecodeBounds = false;
		Log.d("Tag", "with:" + options.outWidth);
		// int be = (int) (((double) options.outWidth) / ((double)
		// displayWidth));
		int be = 0;
		be = (int) Math.round(((((double) srcWidth) / ((double) displayWidth))));

		options = new Options();
		options.inSampleSize = be;
		//ins = url.openStream();
		
		response = httpClient.execute(httpGet);
		if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
			ins=response.getEntity().getContent();
		}

		bitmap = BitmapFactory.decodeStream(ins, null, options);
		
		ins.close();
		return bitmap;
		
	}