似乎我的Activity遇到了JSON数组名称
的问题这是我的活动：
package com.example.raamzz.booksharev2;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Base64;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;
import com.example.raamzz.booksharev2.CustomListAdapter;
import com.example.raamzz.booksharev2.AppController;
import com.example.raamzz.booksharev2.Book;
import java.util.ArrayList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
public class Romance extends AppCompatActivity {
String TITLES[] = {"Home","Events","Books","Wishlist","Nearby","Edit Profile "};
int ICONS[] = {R.drawable.home,R.drawable.events,R.drawable.books,R.drawable.wishlist,R.drawable.taxi,R.drawable.edit};
private Toolbar toolbar; // Declaring the Toolbar Object
RecyclerView mRecyclerView; // Declaring RecyclerView
RecyclerView.Adapter mAdapter; // Declaring Adapter For Recycler View
RecyclerView.LayoutManager mLayoutManager; // Declaring Layout Manager as a linear layout manager
DrawerLayout Drawer; // Declaring DrawerLayout
ActionBarDrawerToggle mDrawerToggle; // Declaring Action Bar Drawer Toggle
String UserID,UserFN,UserEmail,UserPassword,UserAddress,UserPhone,UserGender,UDOB,ProfPicture;
public static final String DEFUALT_SHARED="N/A";
//---------------------------------//
// Log tag
private static final String TAG = Romance.class.getSimpleName();
// Movies json url
private static final String url = "http://mybookshare.com/app/GetRomanceBooks.php";
private ProgressDialog pDialog;
private List<Book> bookList = new ArrayList<Book>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_romance);
SharedPreferences sp =getSharedPreferences("UserData", Context.MODE_PRIVATE);
UserID = sp.getString("UserID", DEFUALT_SHARED );
UserFN=sp.getString("UserFN",DEFUALT_SHARED);
UserEmail=sp.getString("UserEmail",DEFUALT_SHARED);
ProfPicture=sp.getString("ProfPicture",DEFUALT_SHARED);
//-----------------------------------//
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, bookList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
//-----------------------------------//
byte[] decodedString = Base64.decode(ProfPicture, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
/* Assinging the toolbar object ot the view
and setting the the Action bar to our toolbar
*/
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView); // Assigning the RecyclerView Object to the xml View
mRecyclerView.setHasFixedSize(true); // Letting the system know that the list objects are of fixed size
mAdapter = new MyAdapter(TITLES,ICONS,UserFN,UserEmail,decodedByte); // Creating the Adapter of MyAdapter class(which we are going to see in a bit)
// And passing the titles,icons,header view name, header view email,
// and header view profile picture
mRecyclerView.setAdapter(mAdapter); // Setting the adapter to RecyclerView
final GestureDetector mGestureDetector = new GestureDetector(Romance.this, new GestureDetector.SimpleOnGestureListener() {
@Override public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
mRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
View child = recyclerView.findChildViewUnder(motionEvent.getX(),motionEvent.getY());
if(child!=null && mGestureDetector.onTouchEvent(motionEvent)){
int position=recyclerView.getChildAdapterPosition(child);
switch (position){
case 1:
Intent intent1 = new Intent(Romance.this, UserProfileHOME.class);
Toast.makeText(getApplicationContext(), "Case 1 in home to event", Toast.LENGTH_LONG).show();
Romance.this.startActivity(intent1);
break;
case 2:
Intent intent2 = new Intent(Romance.this, Events.class);
Toast.makeText(getApplicationContext(), "Case 2 in home to event", Toast.LENGTH_LONG).show();
Romance.this.startActivity(intent2);
break;
case 3:
Intent intent3 = new Intent(Romance.this, Books.class);
Toast.makeText(getApplicationContext(), "Case 3 in home to books", Toast.LENGTH_LONG).show();
Romance.this.startActivity(intent3);
break;
case 4:
Intent intent4 = new Intent(Romance.this, Wishlist.class);
Toast.makeText(getApplicationContext(), "Case 4 in home to wishlist", Toast.LENGTH_LONG).show();
Romance.this.startActivity(intent4);
break;
case 5:
Intent intent5 = new Intent(Romance.this, Nearby.class);
Toast.makeText(getApplicationContext(), "Case 5 in home to nearby", Toast.LENGTH_LONG).show();
Romance.this.startActivity(intent5);
break;
case 6:
Intent intent6 = new Intent(Romance.this, Editprofile.class);
Toast.makeText(getApplicationContext(), "Case 6 in home to editprof", Toast.LENGTH_LONG).show();
Romance.this.startActivity(intent6);
break;
}
Drawer.closeDrawers();
}
return false;
}
@Override
public void onTouchEvent(RecyclerView recyclerView, MotionEvent motionEvent) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
mLayoutManager = new LinearLayoutManager(this); // Creating a layout Manager
mRecyclerView.setLayoutManager(mLayoutManager); // Setting the layout Manager
Drawer = (DrawerLayout) findViewById(R.id.DrawerLayout); // Drawer object Assigned to the view
mDrawerToggle = new ActionBarDrawerToggle(this,Drawer,toolbar,R.string.openDrawer,R.string.closeDrawer){
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
// code here will execute once the drawer is opened( As I dont want anything happened whe drawer is
// open I am not going to put anything here)
}
@Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
// Code here will execute once drawer is closed
}
}; // Drawer Toggle Object Made
Drawer.setDrawerListener(mDrawerToggle); // Drawer Listener set to the Drawer toggle
mDrawerToggle.syncState(); // Finally we set the drawer toggle sync State
//-----------------------------------------------------------------------------//
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Book book = new Book();
book.setTitle(obj.getString("BTitle"));
book.setThumbnailUrl(obj.getString("BCoverpath"));
book.setAuthor(obj.getString("BAuthor"));
book.setEdition(obj.getString("BEdition"));
// adding movie to movies array
bookList.add(book);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是我发送json数组的php：
<?php
header('Content-Type: application/json');
$response = array();
require_once('init.php');
$result = mysqli_query($conn,"SELECT *FROM book WHERE IDCateOf = 8") or die(mysql_error());
if (mysqli_num_rows($result) > 0) {
$response["books"]= array();
while ($row = mysqli_fetch_array($result)) {
$books["BID"] = $row["BID"];
$book["BTitle"] = $row["BTitle"];
$book["BAuthor"] = $row["BAuthor"];
$book["BCoverpath"] =$row["BCoverpath"];
$book["BEdition"] = $row["BEdition"];
array_push( $response["books"], $book);
}
echo json_encode($response, JSON_UNESCAPED_SLASHES && JSON_PRETTY_PRINT);
}
?>
使用这个php脚本生成的数组是这样的：
{
"books": [
{
"BTitle": "Attachments",
"BAuthor": "Rainbow Rowell",
"BCoverpath": "http://mybookshare.com/books/1.jpg",
"BEdition": "2th"
},
{
"BTitle": "Maybe Someday",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/2.jpg",
"BEdition": "1th"
},
{
"BTitle": "Me Before You : A Novel (Movie Tie-In)",
"BAuthor": "Jojo Moyes",
"BCoverpath": "http://mybookshare.com/books/3.jpg",
"BEdition": "1th"
},
{
"BTitle": "Hopeless",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/4.jpg",
"BEdition": "1th"
},
{
"BTitle": "Finding Cinderella",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/5.jpg",
"BEdition": "1th"
},
{
"BTitle": "November Nine",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/6.jpg",
"BEdition": "1th"
},
{
"BTitle": "Ugly Love",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/7.jpg",
"BEdition": "3th"
}
]
}
我的android活动无法识别，因为它的json数组必须是这样的：
[
{
"BTitle": "Attachments",
"BAuthor": "Rainbow Rowell",
"BCoverpath": "http://mybookshare.com/books/1.jpg",
"BEdition": "2th"
},
{
"BTitle": "Maybe Someday",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/2.jpg",
"BEdition": "1th"
},
{
"BTitle": "Me Before You : A Novel (Movie Tie-In)",
"BAuthor": "Jojo Moyes",
"BCoverpath": "http://mybookshare.com/books/3.jpg",
"BEdition": "1th"
},
{
"BTitle": "Hopeless",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/4.jpg",
"BEdition": "1th"
},
{
"BTitle": "Finding Cinderella",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/5.jpg",
"BEdition": "1th"
},
{
"BTitle": "November Nine",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/6.jpg",
"BEdition": "1th"
},
{
"BTitle": "Ugly Love",
"BAuthor": "Colleen Hoover",
"BCoverpath": "http://mybookshare.com/books/7.jpg",
"BEdition": "3th"
}
]
我尝试制作一个.json文件，我把最后一个json数组没有名称，应用程序工作正常，但我需要解决这个问题，因为我需要使用php脚本从数据库动态获取数据
答案 0 :(得分：0)
您的第一个JSON不是数组。它是＆＃34;书籍＆＃34;的对象。数组在里面。您需要为此JSON创建适当的对象，例如：
class BookList {
List<Book> books;
}
以下是修改后的代码以使用该JSON：
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
JSONArray arr = response.getJSONArray("books");
for (int i = 0; i < arr.length(); i++) {
try {
JSONObject obj = arr.getJSONObject(i);
Book book = new Book();
book.setTitle(obj.getString("BTitle"));
book.setThumbnailUrl(obj.getString("BCoverpath"));
book.setAuthor(obj.getString("BAuthor"));
book.setEdition(obj.getString("BEdition"));
// adding movie to movies array
bookList.add(book);
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});