不知何故,我似乎并没有得到它。 8-} 我有一个活动,我从数据库请求JSON数据,返回结果包含一个图片URL。我的应用在Android v2.x上运行良好,但由于偶然发现,在Android 4上出现了奇怪的行为 - 包括未加载的图像(这不是我称之为兼容性?!)现在我必须修复这个问题,希望修复不会再次破坏Android 2.x系统的功能!NetworkOnMainThreadException加载图片如何
基本上,活动作品在网络上的所有无数的例子说明(我删除了最错误检查等,以修剪下来的代码主要部分):
new GetProductDetails().execute();
(..)
class GetProductDetails extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
(..)
}
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("pid", pid));
// getting product details by making HTTP request
JSONObject json = jsonParser.makeHttpRequest(
getString(R.string.urlProductDetails), "GET",
params);
try {
JSONArray prodObj = json.getJSONArray(Consts.PRODS);
pinfo = prodObj.getJSONObject(0);
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
// Storing each json item in variable
try {
String s = "";
txtvname = (TextView) findViewById(R.id.txtpname);
txtshortinfo = (TextView) findViewById(R.id.txtshortinfo);
(… populating activity window with json data …)
}
});
// update image:
String imgURL;
try {
imgURL = pinfo.getString("pic_url");
if (imgURL.length() > 1) {
imgURL = getString(R.string.urlPicsFull) + imgURL;
ImageView imgProd = (ImageView) findViewById(R.id.imgProduct);
Drawable drawable = LoadImageFromWebOperations(imgURL);
imgProd.setImageDrawable(drawable);
}
} catch (JSONException e) {
e.printStackTrace();
}
pDialog.dismiss();
}
private Drawable LoadImageFromWebOperations(String url) {
try {
InputStream is = (InputStream) new URL(url).getContent();
Drawable d = Drawable.createFromStream(is, "src name");
return d;
} catch (Exception e) {
System.out.println("Could not load " + url + ", Exc=" + e);
return null;
}
}
现在,有一个加载图像时出现android.os.NetworkOnMainThreadException。