protected String doInBackground(String... params) {
int progress = 0;
publishProgress(progress += 10);
String[] link_list = new String[100];
Bitmap bmp ;
Document xmlDoc = Jsoup.parse(url, 3000);
Elements title = xmlDoc.select("div[class=meta]");
title_lenth = title.size();
for (int i = 0; i < title_lenth; i++) {
link_list[count] = title.get(i).text();
try{
JSONObject JObj_link ;
JObj_link = new JSONObject(link_list[count]);
link_list[count] = JObj_link.getString("ou");
Log.e("ou Content", link_list[count]);
}catch (Exception e){
Log.e("ou Content", e.toString());
}
System.out.print(titlelist[count]);
count ++ ;
}
setBmp(link_list);
publishProgress(progress += 15);
} catch (MalformedURLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
publishProgress(progress = 100);
return title_word;
}
我删除了一些代码并不重要的AsyncTask ---在执行doInBackground()
我想做
出现错误 - > setBmp(link_list);
link_list是一个字符串数组内容的URL(http://xxx.xx.jpg)
的setbmp可以下载的图片和设置imageview的
现在有错误消息
logcat的:
03-10 09:32:23.461 16218-16493/com.takepickpicturedemo E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: com.takepickpicturedemo, PID: 16218
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6556)
at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:942)
at android.view.ViewGroup.invalidateChild(ViewGroup.java:5081)
at android.view.View.invalidateInternal(View.java:12713)
at android.view.View.invalidate(View.java:12677)
at android.view.View.invalidate(View.java:12661)
at android.widget.AbsListView.resetList(AbsListView.java:1996)
at android.widget.GridView.setAdapter(GridView.java:194)
at com.takepickpicturedemo.MainActivity.setBmp(MainActivity.java:741)
at com.takepickpicturedemo.MainActivity$GetPredict.doInBackground(MainActivity.java:582)
at com.takepickpicturedemo.MainActivity$GetPredict.doInBackground(MainActivity.java:497)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
编辑
所以..
- 主线程不能做网络
- doInBackground不能设置UI
我该怎么做才能下载&改变UI
*只有创建视图层次结构的原始线程可以触及其视图* - 这意味着您在UI线程之外操作UI,这是不允许的。使用'runOnUiThread()':http:// stackoverflow。com/questions/11140285/how-to-use-runonuithread –
可能在你的setBMP中发生了什么,它不应该和可能更新视图 – Pooya
你无法访问doInBackground()方法中的UI,你的setBmp()访问UI,然后由此提出错误。您可以在onPostExecuteMethod()中完成任务后执行UI工作,或者将UI线程调用为runOnUiThread(YOUR_THREAD)。 – Talha