i'm newbie in android developing, i'm trying to adapt this guide to my application, i've got an activity that manages 5 tabs, and i want to display in the first tab the activity in the guide.. here is what i tried but it gives me an error:
public class SampleFragment extends Fragment {
public static String KEY_ID = "id";
public static String KEY_EMAIL = "email";
public static String KEY_NAME = "name";
public static String KEY_JSON = "JSON_DB";
//EVENTI
private static final String TAG = SampleActivity.class.getSimpleName();
private ListView listView;
private FeedListAdapter listAdapter;
private List<FeedItem> feedItems;
private String URL_FEED = "http://ift.tt/1p6F7Tc";
//EVENTI
private static final String ARG_POSITION = "position";
private WebView myWebView;
public ValueCallback<Uri> mUploadMessage;
public final static int FILECHOOSER_RESULTCODE = 1;
private int position;
public static SampleFragment newInstance(int position) {
SampleFragment f = new SampleFragment();
Bundle b = new Bundle();
b.putInt(ARG_POSITION, position);
f.setArguments(b);
return f;
}
public class MyWebChromeClient extends WebChromeClient {
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), SampleFragment.FILECHOOSER_RESULTCODE);
}
}
public class myWebClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("tel:")) {
Intent intent = new Intent(Intent.ACTION_DIAL,
Uri.parse(url));
startActivity(intent);
} else {
view.loadUrl(url);
}
return true;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
LoadPreferences();
Log.i("string", KEY_EMAIL);
Log.i("string", KEY_ID);
Log.i("string", KEY_NAME);
Log.i("string", KEY_JSON);
position = getArguments().getInt(ARG_POSITION);
View rootView = inflater.inflate(page, container, false);
Activity activity = getActivity();
if (KEY_ID == "0") {
Toast.makeText(activity, "Non essendo connesso a Facebook non potrai usufruire di tutte le funzionalità che abbiamo creato apposta per te.", Toast.LENGTH_LONG).show();
}
switch (position) {
case 0:
Cache cache = App.getInstance().getRequestQueue().getCache();
Cache.Entry entry = cache.get(URL_FEED);
if (entry != null) {
// fetch the data from cache
try {
String data = new String(entry.data, "UTF-8");
try {
parseJsonFeed(new JSONObject(data));
} catch (JSONException e) {
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} else {
// making fresh volley request and getting json
JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET,
URL_FEED, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
VolleyLog.d(TAG, "Response: " + response.toString());
if (response != null) {
parseJsonFeed(response);
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
});
// Adding request to volley request queue
App.getInstance().addToRequestQueue(jsonReq);
}
break;
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
}
// }
return rootView;
}
/**
* Parsing json reponse and passing the data to feed view list adapter
* */
private void parseJsonFeed(JSONObject response) {
try {
JSONArray feedArray = response.getJSONArray("feed");
for (int i = 0; i < feedArray.length(); i++) {
JSONObject feedObj = (JSONObject) feedArray.get(i);
FeedItem item = new FeedItem();
item.setId(feedObj.getInt("id"));
item.setName(feedObj.getString("name"));
// Image might be null sometimes
String image = feedObj.isNull("image") ? null : feedObj.getString("image");
item.setImge(image);
item.setStatus(feedObj.getString("status"));
item.setProfilePic(feedObj.getString("profilePic"));
item.setTimeStamp(feedObj.getString("timeStamp"));
// url might be null sometimes
String feedUrl = feedObj.isNull("url") ? null : feedObj.getString("url");
item.setUrl(feedUrl);
feedItems.add(item);
}
// notify data changes to list adapater
listAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
CallbackManager callbackManager = CallbackManager.Factory.create();
callbackManager.onActivityResult(requestCode, resultCode, data);
}
private void LoadPreferences(){
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
KEY_NAME = sharedPreferences.getString("name", "0") ;
KEY_EMAIL = sharedPreferences.getString("email", "0") ;
KEY_ID = sharedPreferences.getString("id", "0") ;
KEY_JSON = sharedPreferences.getString("JSON_DB", "0") ;
//Toast.makeText(this, name, Toast.LENGTH_LONG).show();
//Toast.makeText(this, id, Toast.LENGTH_LONG).show();
//Toast.makeText(this, email, Toast.LENGTH_LONG).show();
}
}
and here is the error:
06-29 19:49:53.183 13763-13763/com.tekinarslan.material.sample E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.tekinarslan.material.sample.SampleFragment.parseJsonFeed(SampleFragment.java:244)
at com.tekinarslan.material.sample.SampleFragment.onCreateView(SampleFragment.java:150)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1786)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:947)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
at android.view.View.measure(View.java:16419)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16419)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:851)
at android.view.View.measure(View.java:16419)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5055)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16419)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5055)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16419)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5055)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16419)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5055)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1410)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16419)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5055)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2549)
at android.view.View.measure(View.java:16419)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2188)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1333)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1544)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1230)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5093)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:561)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5283)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
EDIT Ok, i instantiate and it works, but it doesn't display me the status..
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