asychtask 中的 ruOnUiThread 出错

Question

我正在尝试从服务器解析一些数据并将这些数据与数据库中的数据进行比较... 一切似乎都工作正常...除了即使比较数据发生变化我也只得到相同的值...我将用代码解释...

在下面的代码中，有文本视图 tv3 和 tv4...甚至比较数据，即 shopid 更改，它显示 json...[=11= 的第一个数组的值]

当我尝试调试时，我发现运行OnUithread 中的运行() 在 2-3 次循环后调用...我不知道这里发生了什么...请告诉我帮助解决问题...

编辑：在调试时，当我跳到每一行时它没有显示任何错误... 但是当我尝试使用 F9 跳到断点时它显示错误...

编辑：2：由于代码有点长，我只是删除了一些不需要的部分...

private Bitmap downloadBitmap(String url) {
    HttpURLConnection urlConnection = null;
    try {
        URL uri = new URL(url);
        urlConnection = (HttpURLConnection) uri.openConnection();

        int statusCode = urlConnection.getResponseCode();
        if (statusCode != HttpStatus.SC_OK) {
            return null;
        }

        InputStream inputStream = urlConnection.getInputStream();
        if (inputStream != null) {
            bitmap = BitmapFactory.decodeStream(inputStream);
            return bitmap;
        }
    } catch (Exception e) {
        urlConnection.disconnect();
        Log.w("ImageDownloader", "Error downloading image from " + url);
    } finally {
        if (urlConnection != null) {
            urlConnection.disconnect();
        }
    }
    return null;
}

@Override
public void onResume() {
    mapView.onResume();
    super.onResume();
}

@Override
public void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
}

@Override
public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
}

private class GetJsondata extends AsyncTask<Void, Void, String> {

    @Override
    protected void onPreExecute() {
        dialog = ProgressDialog.show(getActivity(), "", getActivity().getResources().getString(R.string.pleasewait), true);
    }

    @Override
    protected String doInBackground(Void... arg0) {
        // Creating service handler class instance
        ConnectivityManager conMgr = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
        activeNetwork = conMgr.getActiveNetworkInfo();
        if (activeNetwork != null && activeNetwork.isConnected()) {
            ServiceHandler sh = new ServiceHandler();

            // Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

            Log.d("Response: ", "> " + jsonStr);

            if (jsonStr != null) {
                try {
                    jsonObj = new JSONObject(jsonStr);
                    ObjectOutput out = new ObjectOutputStream(new FileOutputStream
                            (new File(getActivity().getCacheDir(), "") + File.separator + "cacheFile.srl"));
                    out.writeObject(jsonObj.toString());
                    out.close();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (JSONException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                Log.e("ServiceHandler", "Couldn't get any data from the url");
            }
        } else {
            try {
                ObjectInputStream in = new ObjectInputStream(new FileInputStream
                        (new File(getActivity().getCacheDir() + File.separator + "cacheFile.srl")));
                jsonObj = new JSONObject((String) in.readObject());
                in.close();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            } catch (OptionalDataException e) {
                e.printStackTrace();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (StreamCorruptedException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        if (jsonObj != null) {
            try {
                ofrList = new ArrayList<ArrayList<String>>();
                // Getting JSON Array node
                jsonArray = jsonObj.getJSONArray("offers");

                shoplistarray = new ArrayList<ArrayList<String>>();


                // looping through All Contacts
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject c = jsonArray.getJSONObject(i);

                    url1 = c.getString("url");
                    if (userPrefs.getString("locale", null) == null || userPrefs.getString("locale", null).equals("en")) {
                        desc = c.getString("desc");
                    } else {
                        desc = c.getString("desc_ar");
                    }
                    expdate = c.getString("expdate");
                    ofrdate = c.getString("date");
                    shopsarray = c.getJSONArray("shops");
                    for (int n = 0; n < shopsarray.length(); n++) {
                        JSONObject jobj = shopsarray.getJSONObject(n);
                        shopid = jobj.getString("shopid");
                        if (shopid.equals(id) && tv3.getText().toString().equals("") ) {
                            downloadBitmap(url1);
                            finalI = i;
                                getActivity().runOnUiThread(new Runnable() {
                                    public void run() {
                                        if (activeNetwork != null && activeNetwork.isConnected()) {
                                            image.setImageBitmap(bitmap);
                                            saveFileInCache(String.valueOf(finalI), bitmap);
                                        } else {
                                            getFileOutOfCache(String.valueOf(finalI));
                                            image.setImageBitmap(bitmap);
                                        }
                                        tv3.setText(desc);
                                        tv4.setText(getActivity().getResources().getString(R.string.validtill) + expdate);
                                    }
                                });
                        }
                    }
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
        } else {
            getActivity().runOnUiThread(new Runnable() {
                public void run() {
                    Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.urnotconnected), Toast.LENGTH_LONG).show();
                }
            });
        }

            return desc;
    }

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        dialog.dismiss();
    }
}


private Bitmap getFileOutOfCache(String fileName) {
    final String cachePath = getActivity().getCacheDir().getPath();
    File myDiskCacheFilePath = new File(cachePath);
    File myCachedFile = new File(myDiskCacheFilePath
            + File.separator + fileName);
    if (myCachedFile.exists()) {
        bitmap = BitmapFactory.decodeFile(myCachedFile.toString());
    } else {
        Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.cachedfilenotexist), Toast.LENGTH_LONG).show();

    }
    return bitmap;
}

public void saveFileInCache(String aFileName, Bitmap myImage) {
    final String cachePath = getActivity().getCacheDir().getPath();
    File myDiscCacheFilePath;
    myDiscCacheFilePath = new File(cachePath);
    File myDiscCacheFile = new File(myDiscCacheFilePath + File.separator + aFileName);
    try {
        FileOutputStream out = new FileOutputStream(myDiscCacheFile);
        myImage.compress(Bitmap.CompressFormat.JPEG, 80, out);
        out.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.cachefailed), Toast.LENGTH_SHORT).show();

    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

Answer 1

 ConnectivityManager conMgr = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
activeNetwork = conMgr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected()) {
new GetJsondata().execute()
}else{
//show toast
}

将上面的代码写在你从异步任务本身调用asynctask.Remove它的地方。

Answer 2

private Bitmap downloadBitmap(String url) {
HttpURLConnection urlConnection = null;
try {
    URL uri = new URL(url);
    urlConnection = (HttpURLConnection) uri.openConnection();

    int statusCode = urlConnection.getResponseCode();
    if (statusCode != HttpStatus.SC_OK) {
        return null;
    }

    InputStream inputStream = urlConnection.getInputStream();
    if (inputStream != null) {
        bitmap = BitmapFactory.decodeStream(inputStream);
        return bitmap;
    }
} catch (Exception e) {
    urlConnection.disconnect();
    Log.w("ImageDownloader", "Error downloading image from " + url);
} finally {
    if (urlConnection != null) {
        urlConnection.disconnect();
    }
}
return null;
}

@Override
public void onResume() {
mapView.onResume();
super.onResume();
}

@Override
public void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}

@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}

private class GetJsondata extends AsyncTask<Void, Void, String> {

boolean isIfCondition=false;
@Override
protected void onPreExecute() {
    dialog = ProgressDialog.show(getActivity(), "", getActivity().getResources().getString(R.string.pleasewait), true);
}

@Override
protected String doInBackground(Void... arg0) {
    // Creating service handler class instance
    ConnectivityManager conMgr = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
    activeNetwork = conMgr.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
        ServiceHandler sh = new ServiceHandler();

        // Making a request to url and getting response
        String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

        Log.d("Response: ", "> " + jsonStr);

        if (jsonStr != null) {
            try {
                jsonObj = new JSONObject(jsonStr);
                ObjectOutput out = new ObjectOutputStream(new FileOutputStream
                        (new File(getActivity().getCacheDir(), "") + File.separator + "cacheFile.srl"));
                out.writeObject(jsonObj.toString());
                out.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            Log.e("ServiceHandler", "Couldn't get any data from the url");
        }
    } else {
        try {
            ObjectInputStream in = new ObjectInputStream(new FileInputStream
                    (new File(getActivity().getCacheDir() + File.separator + "cacheFile.srl")));
            jsonObj = new JSONObject((String) in.readObject());
            in.close();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (OptionalDataException e) {
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (StreamCorruptedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
    if (jsonObj != null) {
        try {
            ofrList = new ArrayList<ArrayList<String>>();
            // Getting JSON Array node
            jsonArray = jsonObj.getJSONArray("offers");

            shoplistarray = new ArrayList<ArrayList<String>>();


            // looping through All Contacts
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject c = jsonArray.getJSONObject(i);

                url1 = c.getString("url");
                if (userPrefs.getString("locale", null) == null || userPrefs.getString("locale", null).equals("en")) {
                    desc = c.getString("desc");
                } else {
                    desc = c.getString("desc_ar");
                }
                expdate = c.getString("expdate");
                ofrdate = c.getString("date");
                shopsarray = c.getJSONArray("shops");
                for (int n = 0; n < shopsarray.length(); n++) {
                    JSONObject jobj = shopsarray.getJSONObject(n);
                    shopid = jobj.getString("shopid");
                    if (shopid.equals(id) && tv3.getText().toString().equals("") ) {
                        downloadBitmap(url1);
                        finalI = i;
                        //no need to use runonuithread since post execute methods already runs on main ui thread ..rather set isIfCondition=true and do this job on postexecute method
                            isIfCondition=true;
                            desc1=desc;
                            expdate1=expdate;
                            /*getActivity().runOnUiThread(new Runnable() {
                                public void run() {
                                    if (activeNetwork != null && activeNetwork.isConnected()) {
                                        image.setImageBitmap(bitmap);
                                        saveFileInCache(String.valueOf(finalI), bitmap);
                                    } else {
                                        getFileOutOfCache(String.valueOf(finalI));
                                        image.setImageBitmap(bitmap);
                                    }
                                    tv3.setText(desc);
                                    tv4.setText(getActivity().getResources().getString(R.string.validtill) + expdate);
                                }
                            });*/
                    }
                }
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }
    } else {
      //no need to use runonuithread since post execute methods already runs on main ui thread
        /*getActivity().runOnUiThread(new Runnable() {
            public void run() {
                Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.urnotconnected), Toast.LENGTH_LONG).show();
            }
        });*/
    }

        return desc;
}

@Override
protected void onPostExecute(String result) {
    super.onPostExecute(result);
    dialog.dismiss();
    if(isIfCondition=true)
    {
          if (activeNetwork != null && activeNetwork.isConnected()) {
                                        image.setImageBitmap(bitmap);
                                        saveFileInCache(String.valueOf(finalI), bitmap);
                                    } else {
                                        getFileOutOfCache(String.valueOf(finalI));
                                        image.setImageBitmap(bitmap);
                                    }
                                    tv3.setText(desc1);
                                    tv4.setText(getActivity().getResources().getString(R.string.validtill) + expdate1);
    }
}
}

private Bitmap getFileOutOfCache(String fileName) {
final String cachePath = getActivity().getCacheDir().getPath();
File myDiskCacheFilePath = new File(cachePath);
File myCachedFile = new File(myDiskCacheFilePath
        + File.separator + fileName);
if (myCachedFile.exists()) {
    bitmap = BitmapFactory.decodeFile(myCachedFile.toString());
} else {
    Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.cachedfilenotexist), Toast.LENGTH_LONG).show();

}
return bitmap;
}

public void saveFileInCache(String aFileName, Bitmap myImage) {
final String cachePath = getActivity().getCacheDir().getPath();
File myDiscCacheFilePath;
myDiscCacheFilePath = new File(cachePath);
File myDiscCacheFile = new File(myDiscCacheFilePath + File.separator + aFileName);
try {
    FileOutputStream out = new FileOutputStream(myDiscCacheFile);
    myImage.compress(Bitmap.CompressFormat.JPEG, 80, out);
    out.close();
} catch (FileNotFoundException e) {
    e.printStackTrace();
    Toast.makeText(getActivity(), getActivity().getResources().getString(R.string.cachefailed), Toast.LENGTH_SHORT).show();

} catch (IOException e) {
    e.printStackTrace();
}
}

there is not need to use runonuithread or any other thread...because asynctask is already do this for you..doinbackground work run on bgthread and onpostexecute work on mainuithread..

只需检查代码...我还没有检查过..但它肯定会工作....

asychtask 中的 ruOnUiThread 出错

Error on ruOnUiThread inside asychtask

android

json

android-asynctask

android-runonuithread