我有一个应用程序，它显示来自本地主机的数据库。 PHP文件将从'movies'表中获取'movie_name'的所有值。
从现在开始，该应用程序可以很好地运行，因为它显示了“ movie_name”的所有列表，并且还保留了“ username”登录的会话。
我正在尝试使用具有活动会话的'username'的值来过滤数据。我试图通过添加 user.getFullName（）来修改doiInBackground（）方法中MovieListingActivity.java中getString的值。但是没用。
protected String doInBackground(String... params) {
Session Handler session = new SessionHandler(getApplicationContext());
User user = session.getUserDetails();
HttpJsonParser httpJsonParser = new HttpJsonParser();
JSONObject jsonObject = httpJsonParser.makeHttpRequest(
BASE_URL + "fetch_all_movies.php", "GET", null);
try {
int success = jsonObject.getInt(KEY_SUCCESS);
JSONArray movies;
if (success == 1) {
movieList = new ArrayList<>();
movies = jsonObject.getJSONArray(KEY_DATA);
//Iterate through the response and populate movies list
for (int i = 0; i < movies.length(); i++) {
JSONObject movie = movies.getJSONObject(i);
Integer movieId = movie.getInt(KEY_MOVIE_ID);
String movieName = movie.getString(KEY_MOVIE_NAME=user.getFullName());
HashMap<String, String> map = new HashMap<>();
map.put(KEY_MOVIE_ID, movieId.toString());
map.put(KEY_MOVIE_NAME, movieName);
movieList.add(map);}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String result) {
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
populateMovieList();
}
});
}
这是我的MovieListingActivity.java：
package com.bani.loginandregistration;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import com.bani.loginandregistration.helper.CheckNetworkStatus;
import com.bani.loginandregistration.helper.HttpJsonParser;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class MovieListingActivity extends AppCompatActivity {
private static final String KEY_SUCCESS = "success";
private static final String KEY_DATA = "data";
private static final String KEY_MOVIE_ID = "movie_id";
private static String KEY_MOVIE_NAME = "movie_name";
private static final String BASE_URL = "http://192.168.43.197/movies/";
private ArrayList<HashMap<String, String>> movieList;
private ListView movieListView;
private ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_listing);
movieListView = (ListView) findViewById(R.id.movieList);
new FetchMoviesAsyncTask().execute();
}
/**
* Fetches the list of movies from the server
*/
private class FetchMoviesAsyncTask extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
//Display progress bar
pDialog = new ProgressDialog(MovieListingActivity.this);
pDialog.setMessage("Loading movies. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... params) {
HttpJsonParser httpJsonParser = new HttpJsonParser();
JSONObject jsonObject = httpJsonParser.makeHttpRequest(
BASE_URL + "fetch_all_movies.php", "GET", null);
try {
int success = jsonObject.getInt(KEY_SUCCESS);
JSONArray movies;
if (success == 1) {
movieList = new ArrayList<>();
movies = jsonObject.getJSONArray(KEY_DATA);
//Iterate through the response and populate movies list
for (int i = 0; i < movies.length(); i++) {
JSONObject movie = movies.getJSONObject(i);
Integer movieId = movie.getInt(KEY_MOVIE_ID);
String movieName = movie.getString(KEY_MOVIE_NAME);
HashMap<String, String> map = new HashMap<>();
map.put(KEY_MOVIE_ID, movieId.toString());
map.put(KEY_MOVIE_NAME, movieName);
movieList.add(map);}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String result) {
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
populateMovieList();
}
});
}
}
/**
* Updating parsed JSON data into ListView
* */
private void populateMovieList() {
SessionHandler session;
session = new SessionHandler(getApplicationContext());
User user = session.getUserDetails();
ListAdapter adapter = new SimpleAdapter(
MovieListingActivity.this, movieList,
R.layout.list_item, new String[]{KEY_MOVIE_ID,
KEY_MOVIE_NAME},
new int[]{R.id.movieId, R.id.movieName});
// updating listview
movieListView.setAdapter(adapter);
//Call MovieUpdateDeleteActivity when a movie is clicked
movieListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//Check for network connectivity
if (CheckNetworkStatus.isNetworkAvailable(getApplicationContext())) {
String movieId = ((TextView) view.findViewById(R.id.movieId))
.getText().toString();
Intent intent = new Intent(getApplicationContext(),
MovieUpdateDeleteActivity.class);
intent.putExtra(KEY_MOVIE_ID, movieId);
startActivityForResult(intent, 20);
} else {
Toast.makeText(MovieListingActivity.this,
"Unable to connect to internet",
Toast.LENGTH_LONG).show();
}
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 20) {
// If the result code is 20 that means that
// the user has deleted/updated the movie.
// So refresh the movie listing
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
}
这是我的SessionHandler.java：
package com.bani.loginandregistration;
import android.content.Context;
import android.content.SharedPreferences;
import java.util.Date;
/**
* Created by Abhi on 20 Jan 2018 020.
*/
public class SessionHandler {
private static final String PREF_NAME = "UserSession";
private static final String KEY_USERNAME = "username";
private static final String KEY_EXPIRES = "expires";
private static final String KEY_FULL_NAME = "full_name";
private static final String KEY_EMPTY = "";
private Context mContext;
private SharedPreferences.Editor mEditor;
private SharedPreferences mPreferences;
public SessionHandler(Context mContext) {
this.mContext = mContext;
mPreferences = mContext.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
this.mEditor = mPreferences.edit();
}
/**
* Logs in the user by saving user details and setting session
*
* @param username
* @param fullName
*/
public void loginUser(String username, String fullName) {
mEditor.putString(KEY_USERNAME, username);
mEditor.putString(KEY_FULL_NAME, fullName);
Date date = new Date();
//Set user session for next 7 days
long millis = date.getTime() + (12 * 60 * 60 * 1000);
mEditor.putLong(KEY_EXPIRES, millis);
mEditor.commit();
}
/**
* Checks whether user is logged in
*
* @return
*/
public boolean isLoggedIn() {
Date currentDate = new Date();
long millis = mPreferences.getLong(KEY_EXPIRES, 0);
/* If shared preferences does not have a value
then user is not logged in
*/
if (millis == 0) {
return false;
}
Date expiryDate = new Date(millis);
/* Check if session is expired by comparing
current date and Session expiry date
*/
return currentDate.before(expiryDate);
}
/**
* Fetches and returns user details
*
* @return user details
*/
public User getUserDetails() {
//Check if user is logged in first
if (!isLoggedIn()) {
return null;
}
User user = new User();
user.setUsername(mPreferences.getString(KEY_USERNAME, KEY_EMPTY));
user.setFullName(mPreferences.getString(KEY_FULL_NAME, KEY_EMPTY));
user.setSessionExpiryDate(new Date(mPreferences.getLong(KEY_EXPIRES, 0)));
return user;
}
/**
* Logs out user by clearing the session
*/
public void logoutUser(){
mEditor.clear();
mEditor.commit();
}
}
这是我的User.java：
package com.bani.loginandregistration;
import java.util.Date;
/**
* Created by Abhi on 20 Jan 2018 020.
*/
public class User {
String username;
String fullName;
Date sessionExpiryDate;
public void setUsername(String username) {
this.username = username;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public void setSessionExpiryDate(Date sessionExpiryDate) {
this.sessionExpiryDate = sessionExpiryDate;
}
public String getUsername() {
return username;
}
public String getFullName() {
return fullName;
}
public Date getSessionExpiryDate() {
return sessionExpiryDate;
}
}