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我打算做的计划是获取一个JSON文件，并将其存储在sharedprefs，然后用另一个函数解析它...JSON获取到sharedpreferences必须加载活动两次
但现在当我加载我活动它显示
com.razorreborn.csebeta W/System.err: org.json.JSONException: Value 0 of type java.lang.Integer cannot be converted to JSONArray
所以我要刷新活动，然后一切工作正常....
这里是代码...
package com.razorreborn.csebeta;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.CardView;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;
import com.android.volley.NetworkResponse;
import com.android.volley.ParseError;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.HttpHeaderParser;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
/**
*
* Created by Kiran Anto aka RazorSharp on 1/26/2016.
* For more Info Contact
* [email protected]
* 9495333724
* All Copyrights Reserved 2016
*
*/
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private RecyclerView mRecyclerView;
private maincardAdapter mAdapter;
private CardView Emptyview;
private ProgressDialog pDialog;
private Context context = this;
private List<maincontent> notiflist = new ArrayList<>();
private static final String TAG_TITLE = "title";
private static final String TAG_CONTENT = "content";
private static final String TAG_DATE = "date";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle(R.string.Notifications);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","KIRAN ANTO", null));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "REGARDING CONTENT OF CSE BETA App");
startActivity(Intent.createChooser(emailIntent, "Send email..."));
}
});
setupCollapsingToolbar();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
Emptyview = (CardView) findViewById(R.id.card_view_sub);
Global.orientation = getResources().getConfiguration().orientation;
switch (Global.orientation)
{
case Configuration.ORIENTATION_UNDEFINED: Global.Orientation = "Undefined"; break;
case Configuration.ORIENTATION_LANDSCAPE: Global.Orientation = "Landscape"; break;
case Configuration.ORIENTATION_PORTRAIT: Global.Orientation = "Portrait"; break;
default: Global.Orientation = "Square";break;
}
StaggeredGridLayoutManager mSGLM;
if(Global.Orientation.equals("Portrait")) {
mSGLM = new StaggeredGridLayoutManager(1,1);
} else {
mSGLM = new StaggeredGridLayoutManager(2,1);
}
mSGLM.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView = (RecyclerView)findViewById(R.id.list);
mRecyclerView.setLayoutManager(mSGLM);
mRecyclerView.setHasFixedSize(true);
SwipeRefreshLayout swiperefresh = new SwipeRefreshLayout(getApplicationContext());
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mAdapter = new maincardAdapter(notiflist,getApplicationContext());
mRecyclerView.setAdapter(mAdapter);
jsonFetch();
jsonparse();
swiperefresh.findViewById(R.id.swiperefresh);
swiperefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
jsonFetch();
}
});
swiperefresh.setColorSchemeResources(R.color.colorAccent,R.color.colorPrimary,R.color.cardview_dark_background);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
private void setupCollapsingToolbar() {
final CollapsingToolbarLayout collapsingToolbar = (CollapsingToolbarLayout) findViewById(
R.id.collapse_toolbar);
collapsingToolbar.setTitleEnabled(true);
}
private void jsonFetch() {
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setTitle(getString(R.string.loading));
pDialog.setMessage(getString(R.string.loading));
pDialog.setCancelable(false);
pDialog.show();
String NOTIF = getString(R.string.notif_link);
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(new CustomJsonRequestMain(NOTIF, null,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
hidePDialog();
// fetching json to shared preferences;
SharedPreferences sharedPreferences= context.getSharedPreferences("Prefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor= sharedPreferences.edit();
editor.putString("Notifications",response.toString());
editor.apply();
}
}
, new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error: " + error.getMessage());
//error.printStackTrace();
hidePDialog();
}
}
)
{
@Override
protected Response<JSONArray> parseNetworkResponse(
NetworkResponse response) {
try {
String jsonString = new String(response.data,
HttpHeaderParser
.parseCharset(response.headers));
return Response.success(new JSONArray(jsonString),
HttpHeaderParser
.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
}
).getCacheEntry();
}
private void jsonparse()
{
JSONArray notifications=new JSONArray();
SharedPreferences sharedPreferences= context.getSharedPreferences("Prefs", Context.MODE_PRIVATE);
try {
Object obj=sharedPreferences.getString("Notifications","0");
notifications=new JSONArray(obj.toString());
}catch(JSONException e)
{
Toast.makeText(context,e.toString(),
Toast.LENGTH_SHORT).show();
e.printStackTrace();}
try{
for (int i=0;i<notifications.length();i++)
{
maincontent maincontent = new maincontent();
JSONObject notif=notifications.getJSONObject(i);
maincontent.setTitle(notif.getString(TAG_TITLE));
maincontent.setContent(notif.getString(TAG_CONTENT));
maincontent.setDate(notif.getString(TAG_DATE));
notiflist.add(maincontent);
}
if(notiflist.isEmpty()) {
Log.i("LOG :", "EMPTY RECYCLERVIEW");
mRecyclerView.setVisibility(View.GONE);
Emptyview.setVisibility(View.VISIBLE);
}
else {
mRecyclerView.setVisibility(View.VISIBLE);
Emptyview.setVisibility(View.GONE);
}
mAdapter = new maincardAdapter(notiflist, getApplicationContext());
mRecyclerView.setAdapter(mAdapter);
}catch (JSONException e){
e.printStackTrace();
}
}
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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) {
Intent subject = new Intent(getApplicationContext(), SettingsActivity.class);
startActivity(subject);
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_dsa) {
Global.subject = "Data Structures and Algorithm";
Global.subjectCode = "dsa";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_maths) {
Global.subject = "Maths";
Global.subjectCode = "maths";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_toc) {
Global.subject = "Theory of Computation";
Global.subjectCode = "toc";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_oop) {
Global.subject = "Object Oriented Programming";
Global.subjectCode = "oop";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_mps) {
Global.subject = "MicroProcessor";
Global.subjectCode = "mps";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_scs) {
Global.subject = "Signals and Communication";
Global.subjectCode = "scs";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_notif) {
Intent notif = new Intent(getApplicationContext(), MainActivity.class);
startActivity(notif);
} else if (id == R.id.nav_dsalab) {
Global.subject = "DSA LAb";
Global.subjectCode = "dsalab";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_scslab) {
Global.subject = "SCS LAB";
Global.subjectCode = "scslab";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
}else if (id == R.id.nav_exam) {
Global.subject = "Question Papers";
Global.subjectCode = "qp";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
}else if (id == R.id.nav_misc) {
Global.subject = "Miscellaneous";
Global.subjectCode = "misc";
Intent subject = new Intent(getApplicationContext(), OopActivity.class);
startActivity(subject);
} else if (id == R.id.nav_share) {
Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
sharingIntent.setType("text/plain");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, getString(R.string.AppShare));
startActivity(Intent.createChooser(sharingIntent, "Share via"));
} else if (id == R.id.nav_send) {
Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
sharingIntent.setType("text/plain");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, Global.AppShare);
startActivity(Intent.createChooser(sharingIntent, "Share via"));
} else if (id == R.id.nav_mail) {
Intent emailIntent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","KIRAN ANTO", null));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "REGARDING CONTENT OF CSE BETA App");
startActivity(Intent.createChooser(emailIntent, "Send email..."));
} else if (id == R.id.nav_parents){
Intent parents = new Intent(getApplicationContext(), ParentsActivity.class);
startActivity(parents);
} else if (id == R.id.nav_setting){
Intent subject = new Intent(getApplicationContext(), SettingsActivity.class);
startActivity(subject);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}