我正在使用Volley库在Android中制作应用程序，我想向onResponse()方法的loadAll()添加一个ProgressDialog，但是当我这样做时，轮子在该方法期间不会移动。
我曾尝试对onResponse和ProgressDialog本身使用AsyncTask，但是它甚至不会出现。如果有人可以帮助我，那将真的有帮助。
这是loadAll()方法：
public void loadAll() {
checkPermissions();
String tag_string_req = "string_req";
final String TAG = AppController.class
.getSimpleName();
String url = "http://android.diggin.io/projectmanager/v1/all";
pDialog = new ProgressDialog(this);
pDialog.setMessage("Synchronizing...");
pDialog.show();
StringRequest strReq = new StringRequest(Request.Method.GET,
url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, response);
try {
JSONObject jsonObject = new JSONObject(response);
if (!jsonObject.getBoolean("error")) {
SharedPreferences sharedPref = MainActivity.this.getSharedPreferences(getString(R.string.user_id), Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.user_id), jsonObject.getInt("user_id"));
editor.commit();
JSONArray jsonProjects = jsonObject.getJSONArray("projects");
JSONArray jsonPhotos = jsonObject.getJSONArray("photos");
db.clearDB();
File dir = getDir("projectImages", Context.MODE_PRIVATE);
if (dir.isDirectory()) {
String[] children = dir.list();
for (int count = 0; count < children.length; count++)
{
boolean onlyThumbs = true;
File subDir = new File(dir, children[count]);
String[] subChildren = subDir.list();
for (int count2 = 0; count2 < subChildren.length; count2++)
{
File subSubDir = new File(subDir, subChildren[count2]);
String[] subSubChildren = subSubDir.list();
for (int count3 = 0; count3 < subSubChildren.length; count3++)
{
if (subSubChildren[count3].startsWith("picture")) {
onlyThumbs = false;
}
}
if (onlyThumbs) {
File file = new File(subSubDir.getPath());
if (file.exists()) {
String deleteCmd = "rm -r " + subSubDir.getPath();
Runtime runtime = Runtime.getRuntime();
try {
runtime.exec(deleteCmd);
} catch (IOException e) {
Log.e("IOException",e.toString());
}
}
}
}
if (onlyThumbs) {
File file = new File(subDir.getPath());
if (file.exists()) {
String deleteCmd = "rm -r " + subDir.getPath();
Runtime runtime = Runtime.getRuntime();
try {
runtime.exec(deleteCmd);
} catch (IOException e) {
Log.e("IOException",e.toString());
}
}
}
}
}
for (int i = 0; i < jsonProjects.length(); i++) {
JSONObject jsonProject = (JSONObject) jsonProjects.get(i);
Project project = new Project(jsonProject.getInt("id"),jsonProject.getString("title"),jsonProject.getInt("user_id"));
db.addProject(project);
JSONArray jsonWells = jsonProject.getJSONArray("wells");
for (int i2 = 0; i2 < jsonWells.length(); i2++)
{
JSONObject jsonWell = (JSONObject) jsonWells.get(i2);
Well well = new Well(jsonWell.getInt("id"),jsonWell.getString("number"),jsonWell.getInt("project_id"));
db.addWell(well);
}
JSONArray jsonTracks = jsonProject.getJSONArray("tracks");
for (int i2 = 0; i2 < jsonTracks.length(); i2++)
{
JSONObject jsonTrack = (JSONObject) jsonTracks.get(i2);
Track track = new Track(jsonTrack.getInt("id"),jsonTrack.getString("number"));
boolean inDb = false;
for (Track t : db.getAllTracks()) {
if(t.toString().equals(track.toString())) {
inDb = true;
}
}
if (!inDb) {
db.addTrack(track);
}
Track_Well track_well = new Track_Well(db.getAllTrackWells().size() + 1, jsonTrack.getInt("id"), jsonTrack.getInt("well_id"));
db.addTrackWell(track_well);
}
JSONArray jsonSurfaces = jsonProject.getJSONArray("surfaces");
for (int i2 = 0; i2 < jsonSurfaces.length(); i2++)
{
JSONObject jsonSurface = (JSONObject) jsonSurfaces.get(i2);
Surface surface = new Surface(jsonSurface.getInt("id"),jsonSurface.getString("number"),jsonSurface.getInt("well_id"));
boolean inDb = false;
for (Surface s : db.getAllSurfaces()) {
if(s.toString().equals(surface.toString())) {
inDb = true;
}
}
if (!inDb) {
db.addSurface(surface);
}
Track_Surface track_surface = new Track_Surface(db.getAllTrackSurfaces().size() + 1, (!jsonSurface.isNull("track_id") ? jsonSurface.getInt("track_id") : 0), jsonSurface.getInt("id"));
db.addTrackSurface(track_surface);
}
JSONArray jsonProfiles = jsonProject.getJSONArray("profiles");
for (int i2 = 0; i2 < jsonProfiles.length(); i2++)
{
JSONObject jsonProfile = (JSONObject) jsonProfiles.get(i2);
Profile profile = new Profile(jsonProfile.getInt("id"),jsonProfile.getString("number"),jsonProfile.getInt("well_id"));
boolean inDb = false;
for (Profile p : db.getAllProfiles()) {
if(p.toString().equals(profile.toString())) {
inDb = true;
}
}
if (!inDb) {
db.addProfile(profile);
}
Track_Profile track_profile = new Track_Profile(db.getAllTrackProfiles().size() + 1, (!jsonProfile.isNull("track_id") ? jsonProfile.getInt("track_id") : 0), jsonProfile.getInt("id"));
db.addTrackProfile(track_profile);
}
JSONArray jsonFieldfinds = jsonProject.getJSONArray("fieldfinds");
for (int i2 = 0; i2 < jsonFieldfinds.length(); i2++)
{
JSONObject jsonFieldfind = (JSONObject) jsonFieldfinds.get(i2);
Fieldfind fieldfind = new FieldfindBuilder().id(jsonFieldfind.getInt("id"))
.number(jsonFieldfind.getString("number"))
.project_id(!jsonFieldfind.isNull("project_id") ? jsonFieldfind.getInt("project_id") : 0) // if (!jsonFieldfind.isNull("project_id")) {
.well_id(!jsonFieldfind.isNull("well_id") ? jsonFieldfind.getInt("well_id") : 0) // well_id = jsonFieldfind.getInt("project_id");
.track_id(!jsonFieldfind.isNull("track_id") ? jsonFieldfind.getInt("track_id") : 0) // } else {
.surface_id(!jsonFieldfind.isNull("surface_id") ? jsonFieldfind.getInt("surface_id") : 0) // well_id = 0;
.profile_id(!jsonFieldfind.isNull("profile_id") ? jsonFieldfind.getInt("profile_id") : 0) // }
.user_id(jsonFieldfind.getInt("user_id")).buildFieldfind();
db.addFieldfind(fieldfind);
}
}
for(int i3 = 0; i3 < jsonPhotos.length(); i3++) {
JSONObject jsonPhoto = (JSONObject) jsonPhotos.get(i3);
File mainDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator + "ProjectManager");
String pathStart = mainDir.getPath() + "/";
Photo photo = new Photo(jsonPhoto.getInt("id"), jsonPhoto.getInt("user_id"), jsonPhoto.getString("imageable_type"), jsonPhoto.getInt("imageable_id"), pathStart + jsonPhoto.getString("image_path"),jsonPhoto.getString("description"),jsonPhoto.getString("metadata"),jsonPhoto.getString("wind"));
Log.d("LoadAll - Photos(" + i3 + ")", photo.toString());
String filename = photo.getDBImage_path();
File pictureFile = new File(mainDir, filename);
photo.setImage_path(pictureFile.toString());
if (!pictureFile.exists()) {
photo.setImage_path(photo.getThumbnailFromImage_path());
db.addPhoto(photo);
String image_str = jsonPhoto.getString("image");
byte[] byte_arr = Base64.decode(image_str, 0);
Bitmap bitmap = BitmapFactory.decodeByteArray(byte_arr, 0, byte_arr.length);
try {
createPicture(bitmap, photo);
} catch (IOException e) {
e.printStackTrace();
}
} else {
db.addPhoto(photo);
syncPhotos.add(photo);
}
}
getAllProjects();
} else {
//Send message when username and/or password is incorrect
runOnUiThread(new Runnable() {
@Override
public void run() {
AlertDialog.Builder dlgAlert = new AlertDialog.Builder(MainActivity.this);
dlgAlert.setMessage("Something went wrong");
dlgAlert.setPositiveButton("OK", null);
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
});
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
startActivity(intent);
}
} catch (JSONException e) {
e.printStackTrace();
}
pDialog.hide();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
pDialog.hide();
}
}) {
//Passing some request headers
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> headers = new HashMap<>();
headers.put("Authorization", apiKey);
return headers;
}
};
// Adding request to request queue
AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
}
最佳答案
检查您的代码，似乎您可能在主线程上执行了数据库操作，这也许是进度对话框挂起的原因。
在后台线程（使用AsyncTask）中移动数据库操作即可完成操作。