@Override
public double calculateDistance(int txPower, double rssi) {
if (mDistanceCalculator == null) {
LogManager.w(TAG, "distance calculator has not been set");
return -1.0;
}
return mDistanceCalculator.calculateDistance(txPower, rssi);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void requestModelMapFromWeb() {
if (mContext.checkCallingOrSelfPermission("android.permission.INTERNET")
!= PackageManager.PERMISSION_GRANTED) {
LogManager.w(
TAG,
"App has no android.permission.INTERNET permission. Cannot check for distance model updates");
return;
}
new ModelSpecificDistanceUpdater(
mContext,
mRemoteUpdateUrlString,
new ModelSpecificDistanceUpdater.CompletionHandler() {
@Override
public void onComplete(String body, Exception ex, int code) {
if (ex != null) {
LogManager.w(
TAG,
"Cannot updated distance models from online database at %s",
ex,
mRemoteUpdateUrlString);
} else if (code != 200) {
LogManager.w(
TAG,
"Cannot updated distance models from online database at %s "
+ "due to HTTP status code %s",
mRemoteUpdateUrlString,
code);
} else {
LogManager.d(TAG, "Successfully downloaded distance models from online database");
try {
buildModelMap(body);
if (saveJson(body)) {
loadModelMapFromFile();
mDistanceCalculator = findCalculatorForModel(mRequestedModel);
LogManager.i(
TAG,
"Successfully updated distance model with latest from online database");
}
} catch (JSONException e) {
LogManager.w(e, TAG, "Cannot parse json from downloaded distance model");
}
}
}
})
.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
}
private boolean saveJson(String jsonString) {
FileOutputStream outputStream = null;
try {
outputStream = mContext.openFileOutput(CONFIG_FILE, Context.MODE_PRIVATE);
outputStream.write(jsonString.getBytes());
outputStream.close();
} catch (Exception e) {
LogManager.w(e, TAG, "Cannot write updated distance model to local storage");
return false;
} finally {
try {
if (outputStream != null) outputStream.close();
} catch (Exception e) {
}
}
LogManager.i(TAG, "Successfully saved new distance model file");
return true;
}
private DistanceCalculator findCalculatorForModel(AndroidModel model) {
LogManager.d(
TAG,
"Finding best distance calculator for %s, %s, %s, %s",
model.getVersion(),
model.getBuildNumber(),
model.getModel(),
model.getManufacturer());
if (mModelMap == null) {
LogManager.d(TAG, "Cannot get distance calculator because modelMap was never initialized");
return null;
}
int highestScore = 0;
AndroidModel bestMatchingModel = null;
for (AndroidModel candidateModel : mModelMap.keySet()) {
if (candidateModel.matchScore(model) > highestScore) {
highestScore = candidateModel.matchScore(model);
bestMatchingModel = candidateModel;
}
}
if (bestMatchingModel != null) {
LogManager.d(TAG, "found a match with score %s", highestScore);
LogManager.d(
TAG,
"Finding best distance calculator for %s, %s, %s, %s",
bestMatchingModel.getVersion(),
bestMatchingModel.getBuildNumber(),
bestMatchingModel.getModel(),
bestMatchingModel.getManufacturer());
mModel = bestMatchingModel;
} else {
mModel = mDefaultModel;
LogManager.w(TAG, "Cannot find match for this device. Using default");
}
return mModelMap.get(mModel);
}