android textView 异步加载html中的图片，android 4.0上出现图片重叠文本

woaimmwwyy 2014-02-20 09:19:04

Spanned spanned = Html.fromHtml(_content, new MyImageGetter(this,

					text_content), new MyTagHandler(this));

			text_content.setText(spanned);

			text_content.setMovementMethod(LinkMovementMethod.getInstance());



public class MyImageGetter implements ImageGetter {



	private Context context;

	private TextView tv;



	public MyImageGetter(Context context, TextView tv) {

		this.context = context;

		this.tv = tv;

	}



	@Override

	public Drawable getDrawable(String source) {

		// TODO Auto-generated method stub

		// 将source进行MD5加密并保存至本地

		String imageName = Common.md5(source);

		String sdcardPath = Environment.getExternalStorageDirectory()

				.toString(); // 获取SDCARD的路径

		// 获取图片后缀名

		String[] ss = source.split("\\.");

		String ext = ss[ss.length - 1];



		// 最终图片保持的地址

		String savePath = sdcardPath + "/" + context.getPackageName() + "/"

				+ imageName + "." + ext;



		File file = new File(savePath);

		if (file.exists()) {

			// 如果文件已经存在，直接返回

			Drawable drawable = Drawable.createFromPath(savePath);

			drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),

					drawable.getIntrinsicHeight());

			return drawable;

		}



		// 不存在文件时返回默认图片，并异步加载网络图片

		Resources res = context.getResources();

		URLDrawable drawable = new URLDrawable(

				res.getDrawable(R.drawable.defualt_image));

		new ImageAsync(drawable).execute(savePath, source);

		return drawable;



	}



	private class ImageAsync extends AsyncTask<String, Integer, Drawable> {



		private URLDrawable drawable;



		public ImageAsync(URLDrawable drawable) {

			this.drawable = drawable;

		}



		@Override

		protected Drawable doInBackground(String... params) {

			// TODO Auto-generated method stub

			String savePath = params[0];

			String url = params[1];



			InputStream in = null;

			try {

				// 获取网络图片

				HttpGet http = new HttpGet(url);

				HttpClient client = new DefaultHttpClient();

				HttpResponse response = (HttpResponse) client.execute(http);

				BufferedHttpEntity bufferedHttpEntity = new BufferedHttpEntity(

						response.getEntity());

				in = bufferedHttpEntity.getContent();



			} catch (Exception e) {

				try {

					if (in != null)

						in.close();

				} catch (Exception e2) {

					// TODO: handle exception

				}

			}



			if (in == null)

				return drawable;



			try {

				File file = new File(savePath);

				String basePath = file.getParent();

				File basePathFile = new File(basePath);

				if (!basePathFile.exists()) {

					basePathFile.mkdirs();

				}

				file.createNewFile();

				FileOutputStream fileout = new FileOutputStream(file);

				byte[] buffer = new byte[4 * 1024];

				while (in.read(buffer) != -1) {

					fileout.write(buffer);

				}

				fileout.flush();



				Drawable mDrawable = Drawable.createFromPath(savePath);

				return mDrawable;

			} catch (Exception e) {

				// TODO: handle exception

			}

			return drawable;

		}



		@Override

		protected void onPostExecute(Drawable result) {

			// TODO Auto-generated method stub

			super.onPostExecute(result);

			if (result != null) {

				drawable.setDrawable(result);

				tv.setText(tv.getText()); // 通过这里的重新设置 TextView 的文字来更新UI

			}

		}



	}



	public class URLDrawable extends BitmapDrawable {



		private Drawable drawable;



		public URLDrawable(Drawable defaultDraw) {

			setDrawable(defaultDraw);

		}



		private void setDrawable(Drawable nDrawable) {

			drawable = nDrawable;

			drawable.setBounds(0, 0, drawable.getIntrinsicWidth(),

					drawable.getIntrinsicHeight());

			setBounds(0, 0, drawable.getIntrinsicWidth(),

					drawable.getIntrinsicHeight());

		}



		@Override

		public void draw(Canvas canvas) {

			// TODO Auto-generated method stub

			drawable.draw(canvas);

		}



	}

}