Listview not returning list of other Facebook friends with the same app - nullpointerexception

Question

Update
It now isn't getting an error, but the list of Facebook friends who also have the application isn't coming up in the main view after I log in, if someone could help with that, that'd be awesome.
I have uploaded the project to HERE for anyone to take a look at and let me know where I'm going wrong please
If you can let me know which file and what part is wrong, and how to fix it, that'd be amazing!
I am trying to get a friends list showing who else has the app in someone's Facebook friends list when they log in, and I keep getting the error "java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference"
The error occurs because savedInstanceState is always null I believe, according to the debugger... any ideas? The full code is below:
package com.phinder.phinder;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import org.json.JSONArray;
import org.json.JSONException;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
public com.phinder.phinder.utils.Constants constants;
ImageView imageView_picture_profile;
TextView textview_nameprofile, textview_emailprofile;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
constants = new com.phinder.phinder.utils.Constants();
imageView_picture_profile = (ImageView) findViewById(R.id.imageView_picture_profile);
textview_emailprofile = (TextView) findViewById(R.id.textview_emailprofile);
textview_nameprofile = (TextView) findViewById(R.id.textview_nameprofile);
textview_emailprofile.setText(constants.loginSharedPreferences.getString(constants.LoginEmail, ""));
textview_nameprofile.setText(constants.loginSharedPreferences.getString(constants.LoginName, ""));
try {
Glide.with(getApplicationContext())
.load("http://" + constants.loginSharedPreferences.getString(constants.LoginImage, ""))
.placeholder(R.mipmap.ic_launcher)
.thumbnail(.1F)
.error(R.mipmap.ic_launcher)
.diskCacheStrategy(DiskCacheStrategy.SOURCE)
.into(imageView_picture_profile);
} catch (Exception e) {
e.getStackTrace();
Log.d("msg", "Photo " + e.getMessage());
}
setContentView(R.layout.activity_main);
Intent intent = getIntent();
String jsondata = intent.getStringExtra("jsondata");
JSONArray friendslist;
ArrayList<String> friends = new ArrayList<>();
try {
friendslist = new JSONArray(jsondata);
for (int l = 0; l < friendslist.length(); l++) {
friends.add(friendslist.getJSONObject(l).getString("name"));
}
} catch (JSONException e) {
e.printStackTrace();
}
ArrayAdapter adapter = new ArrayAdapter<>(MainActivity.this, R.layout.activity_main, friends);
ListView listView = (ListView) findViewById(R.id.listView);
listView.setAdapter(adapter);
}
}
I'm pretty new to Android coding, so sorry if this seems obvious!
I have added the manifest below also, in case that's needed:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.phinder.phinder">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="#string/app_id" />
<activity android:name=".MainActivity"></activity>
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="#string/app_id" />
</activity>
<activity
android:name="com.facebook.FacebookActivity"
android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
android:label="#string/app_name"
android:theme="#android:style/Theme.Translucent.NoTitleBar" />
<meta-data
android:name="com.facebook.sdk.ApplicationId"
android:value="#string/app_id" />
</application>
</manifest>
Here is an error log also (removed some personal information it put in there when retrieving from Facebook):
12/10 23:40:03: Launching app
$ adb shell am start -n "com.phinder.phinder/com.phinder.phinder.LoginActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D
Waiting for application to come online: com.phinder.phinder.test | com.phinder.phinder
Waiting for application to come online: com.phinder.phinder.test | com.phinder.phinder
Waiting for application to come online: com.phinder.phinder.test | com.phinder.phinder
Connecting to com.phinder.phinder
Connected to the target VM, address: 'localhost:8600', transport: 'socket'
E/Zygote: v2
I/SELinux: Function: selinux_compare_spd_ram, index[1], SPD-policy is existed. and_ver=SEPF_SECMOBILE_6.0.1 ver=11
I/libpersona: KNOX_SDCARD checking this for 10412
I/libpersona: KNOX_SDCARD not a persona
W/SELinux: Function: selinux_compare_spd_ram, index[1], priority [1], priority version is VE=SEPF_SECMOBILE_6.0.1_0011
E/Zygote: accessInfo : 0
W/SELinux: SELinux: seapp_context_lookup: seinfo=default, level=s0:c512,c768, pkgname=com.phinder.phinder
I/art: Late-enabling -Xcheck:jni
D/TimaKeyStoreProvider: TimaSignature is unavailable
D/ActivityThread: Added TimaKeyStore provider
I/System.out: Sending WAIT chunk
W/ActivityThread: Application com.phinder.phinder is waiting for the debugger on port 8100...
I/art: Debugger is active
I/System.out: Debugger has connected
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: waiting for debugger to settle...
I/System.out: debugger has settled (1439)
W/System: ClassLoader referenced unknown path: /data/app/com.phinder.phinder-1/lib/arm
I/InstantRun: Instant Run Runtime started. Android package is com.phinder.phinder, real application class is null.
W/System: ClassLoader referenced unknown path: /data/app/com.phinder.phinder-1/lib/arm
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
W/System.err: remove failed: ENOENT (No such file or directory) : /data/user/0/com.phinder.phinder/files/AppEventsLogger.persistedevents
D/Package Name=: com.phinder.phinder
D/Key Hash=: zs7kzMXx78uDoJ9QjcsCuL2xPY0=
W/System.err: remove failed: ENOENT (No such file or directory) : /data/user/0/com.phinder.phinder/files/AppEventsLogger.persistedsessioninfo
D/SecWifiDisplayUtil: Metadata value : none
D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{802af0f I.E...... R.....ID 0,0-0,0}
D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
D/libEGL: eglInitialize EGLDisplay = 0x9e67f7c4
I/OpenGLRenderer: Initialized EGL, version 1.4
D/mali_winsys: new_window_surface returns 0x3000, [2560x1440]-format:1
D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=2
W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy#266ed2f time:66569701
W/System.err: remove failed: ENOENT (No such file or directory) : /data/user/0/com.phinder.phinder/files/AppEventsLogger.persistedevents
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
D/ViewRootImpl: ViewPostImeInputStage processPointer 0
D/ViewRootImpl: ViewPostImeInputStage processPointer 1
I/Timeline: Timeline: Activity_launch_request id:com.phinder.phinder time:66595549
D/SecWifiDisplayUtil: Metadata value : none
D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{cb1dd37 I.E...... R.....I. 0,0-0,0}
D/mali_winsys: new_window_surface returns 0x3000, [2560x1440]-format:1
D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=2
W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy#b071cae time:66595716
V/ActivityThread: updateVisibility : ActivityRecord{1393c2f token=android.os.BinderProxy#266ed2f {com.phinder.phinder/com.phinder.phinder.LoginActivity}} show : true
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{9b1361b V.E...... R.....I. 0,0-0,0}
D/msg: Facebook
D/msg: fbid : 10154826532222425
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
D/mali_winsys: new_window_surface returns 0x3000, [1952x720]-format:1
W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 0 - 0, 0) vi=Rect(0, 0 - 0, 0) or=2
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy#266ed2f time:66596446
D/ViewRootImpl: #3 mView = null
I/Timeline: Timeline: Activity_launch_request id:com.phinder.phinder time:66596581
D/AbsListView: Get MotionRecognitionManager
E/MotionRecognitionManager: mSContextService = android.hardware.scontext.ISContextService$Stub$Proxy#4d4175c
E/MotionRecognitionManager: motionService = com.samsung.android.motion.IMotionRecognitionService$Stub$Proxy#4394d48
E/MotionRecognitionManager: motionService = com.samsung.android.motion.IMotionRecognitionService$Stub$Proxy#4394d48
D/AbsListView: Get MotionRecognitionManager
D/SecWifiDisplayUtil: Metadata value : none
D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{f7ccc01 I.E...... R.....ID 0,0-0,0}
D/mali_winsys: new_window_surface returns 0x3000, [2560x1440]-format:1
W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=2
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy#5176ada time:66596826
V/ActivityThread: updateVisibility : ActivityRecord{1393c2f token=android.os.BinderProxy#266ed2f {com.phinder.phinder/com.phinder.phinder.LoginActivity}} show : false
D/msg: Fb data1 : {Response: responseCode: 200, graphObject: {"id":"10154826532222425","name":"Dean Mokhtar","location":{"id":"109563165735553","name":"October 6, Al Jizah, Egypt"},"email":"mokdeabar#hotmail.com","picture":{"data":{"is_silhouette":false,"url":"https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-1\/s200x200\/1471998_10152127224047425_6664922_n.jpg?oh=b5df53e5296ebea31a34126407b64933&oe=58EA2DCC"}}}, error: null}
D/msg: Fb data : {"id":"10154826532222425","name":"DM","location":{"id":"","name":""},"email":"#","picture":{"data":{"is_silhouette":false,"url":"https:\/\/scontent.xx.fbcdn.net\/v\/t1.0-1\/s200x200\/1471998_10152127224047425_6664922_n.jpg?oh=b5df53e5296ebea31a34126407b64933&oe=58EA2DCC"}}}
D/email:
I/WebViewFactory: Loading com.google.android.webview version 55.0.2883.91 (code 288309100)
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.TokenBindingManagerAdapter>
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.TokenBindingManagerAdapter>
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.ServiceWorkerControllerAdapter>
I/art: Rejecting re-init on previously-failed class java.lang.Class<com.android.webview.chromium.ServiceWorkerControllerAdapter>
I/cr_LibraryLoader: Time to load native libraries: 1 ms (timestamps 6941-6942)
I/cr_LibraryLoader: Expected native library version number "55.0.2883.91", actual native library version number "55.0.2883.91"
I/Timeline: Timeline: Activity_launch_request id:com.phinder.phinder time:66596962
D/ViewRootImpl: #3 mView = null
D/ViewRootImpl: #3 mView = null
D/AbsListView: Get MotionRecognitionManager
E/MotionRecognitionManager: mSContextService = android.hardware.scontext.ISContextService$Stub$Proxy#59d2e50
E/MotionRecognitionManager: motionService = com.samsung.android.motion.IMotionRecognitionService$Stub$Proxy#9e94849
E/MotionRecognitionManager: motionService = com.samsung.android.motion.IMotionRecognitionService$Stub$Proxy#9e94849
D/AbsListView: Get MotionRecognitionManager
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.phinder.phinder, PID: 9793
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.phinder.phinder/com.phinder.phinder.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7225)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
at org.json.JSONTokener.nextValue(JSONTokener.java:94)
at org.json.JSONArray.<init>(JSONArray.java:92)
at org.json.JSONArray.<init>(JSONArray.java:108)
at com.phinder.phinder.MainActivity.onCreate(MainActivity.java:61)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349) 
at android.app.ActivityThread.access$1100(ActivityThread.java:221) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:158) 
at android.app.ActivityThread.main(ActivityThread.java:7225) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 
W/System.err: remove failed: ENOENT (No such file or directory) : /data/user/0/com.phinder.phinder/files/AppEventsLogger.persistedevents
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/System.out: (HTTPLog)-Static: isSBSettingEnabled false
I/Process: Sending signal. PID: 9793 SIG: 9
Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'

Answer 1

at org.json.JSONArray.<init>(JSONArray.java:108)
at com.phinder.phinder.MainActivity.onCreate(MainActivity.java:61)
The error in question occurred in the constructor of JsonArray.
This indicates the problem is with the line friendslist = new JSONArray(jsondata).
Since the error in question is a NullPointerException the cause is likely that intent.getStringExtra("jsondata") returned null, which it does in the absence of a value.
To fix the error either make sure anybody who launches the activity includes the additional data in the Intent, or check if the data is present and deal with the absence of data in your own way.