[Demonstration 1]

[Buggy Method]
@Override
protected int doHandle(Request request, Response response) {
    if (ProxySettings.getInstance().isWithProxy()) {
        request.setChallengeResponse(ProxySettings.getInstance().getProxyAuthentication());
    }
    return super.doHandle(request, response);
}

[Buggy Hunk]
request.setChallengeResponse(ProxySettings.getInstance().getProxyAuthentication());

[Patch]
request.setProxyChallengeResponse(ProxySettings.getInstance().getProxyAuthentication());

[Demonstration 2]

[Buggy Method]
@Subscribe
public void onTaskFinishEvent(TaskFinishEvent taskFinishEvent) {
    ITask task = taskFinishEvent.getTask();
    if (task.getTaskException() != null) {
        setViewStatus(true);
        showStatus("请求失败\n" + task.getTaskException().getMessage());
        return;
    }
    if (task instanceof SyncTask) {
        SyncTask syncTask = (SyncTask) task;
        showStatus(String.format("同步完成 : " + apkConfig.getName() + apkConfig.getType()));
        if (syncTask.getResult() == null || syncTask.getResult().isEmpty()) {
            showStatus("没有发现安装包");
            setViewStatus(true);
        } else {
            fileEntry = syncTask.getResult().get(0);
            showStatus(String.format("同步完成 : %s\n%s\n%s", apkConfig.getName() + apkConfig.getType(), fileEntry.name, fileEntry.date));
            File file = new File(ZhenguanyuPathHelper.createCachePath(fileEntry));
            if (file.exists()) {
                apkFile = file;
            } else {
                apkFile = null;
            }
            if (installAuto) {
                if (apkFile == null) {
                    bus.post(new SubmitTaskEvent(TaskFactory.createDownloadTask(fileEntry)));
                } else {
                    setViewStatus(true);
                    installApk(apkFile);
                }
            } else {
                setViewStatus(true);
            }
        }
    } else if (task instanceof DownloadApkTask) {
        DownloadApkTask downloadApkTask = (DownloadApkTask) task;
        apkFile = downloadApkTask.getResult();
        setViewStatus(true);
        showStatus("下载完成 : " + apkConfig.getName() + apkConfig.getType() + "\n" + downloadApkTask.getResult());
        installApk(apkFile);
    }
}

[Buggy Hunk]
showStatus("没有发现安装包");

[Patch]
showStatus(apkConfig.getName() + apkConfig.getType() + "\n没有发现安装包");

[Demonstration 3]

[Buggy Method]
@Override
protected Void doInBackground(Void... params) {
    sR = new StringRequest(Request.Method.GET, URL_DATA, new Response.Listener<String>() {

        @Override
        public void onResponse(String response) {
            try {
                JSONObject jsonObject = new JSONObject(response);
                JSONArray array = jsonObject.getJSONArray("images");
                JSONObject urlObj = array.getJSONObject(0);
                retVal = "https://www.bing.com/" + urlObj.getString("url");
                if (bingImage == null) {
                    //Log.d(TAG, "image is null");
                } else {
                    //Log.d(TAG, "image"+retVal);
                    Picasso.with(getApplicationContext()).load(retVal).fit().into(bingImage);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {

        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
        }
    });
    return null;
}

[Buggy Hunk]
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();

[Patch]
Toast.makeText(getApplicationContext(), "Could not connect to the Internet", Toast.LENGTH_LONG).show();