我有一个 Json 数据，我试图解析成 android。但我遇到了 JSONException；- 类别没有价值。任何人都可以帮助我
我的 MainActivity 在这里：-
public class MainActivity extends AppCompatActivity implements FragmentDrawer.FragmentDrawerListener {
//private static String TAG = MainActivity.class.getSimpleName();
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
String data1,data2,data3,data4,data5;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
// display the first navigation drawer view on app launch
displayView(0);
Log.d("oncreate method","");
new ProductsAsynTask().execute("http://opencart.codeniques.com/myshop/?route=feed/web_api/product&id=30&key=test123");
}
public class ProductsAsynTask extends AsyncTask<String,Void,Void>{
ProgressDialog dialog;
protected void onPreExecute(){
super.onPreExecute();
Log.d("In onPreExceute","");
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Loading, Please wait");
dialog.setTitle("Connecting server");
dialog.show();
dialog.setCancelable(false);
}
protected Void doInBackground(String... param){
try{
Log.d("In doInBackground","");
HttpClient client= new DefaultHttpClient();
HttpPost post = new HttpPost(param[0]);
HttpResponse response = client.execute(post);
int status = response.getStatusLine().getStatusCode();
if(status == 200){
Log.d("Status",""+status);
HttpEntity entity = response.getEntity();
String data = EntityUtils.toString(entity);
JSONObject jsonObject = new JSONObject(data);
JSONArray jArray = jsonObject.getJSONArray("categories");
for(int i = 0;i < jArray.length();i++){
JSONObject jsonObject1 = jArray.getJSONObject(i);
data1 = jsonObject1.getString("name");
Log.d("hello ",data1);
JSONObject jsonObject2 = jsonObject1.getJSONObject("children");
data2 = jsonObject2.getString("name");
Log.d("hello2 ",data2);
JSONObject jsonObject3 = jsonObject2.getJSONObject("children_lv3");
data3 = jsonObject3.getString("name");
Log.d("hello3 ",data3);
data4 = jsonObject3.getString("href");
Log.d("hello4 ",data4);
data5=jsonObject2.getString("href");
Log.d("hello5 ",data5);
}
}
}catch(IOException e){
Log.e("Error IOException :",e.getMessage());
}catch (JSONException e){
Log.e("Error JSONException",e.getMessage());
}
return null;
}
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
dialog.dismiss();
}
}
@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;
}
if(id == R.id.action_search){
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
break;
case 1:
fragment = new FriendsFragment();
title = getString(R.string.title_friends);
break;
case 2:
fragment = new MessagesFragment();
title = getString(R.string.title_messages);
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
}
我是android开发的新手，请帮助我。提前致谢！