Myujth

I am trying to fetch checked listview items from pending activity to allowed_to activity. Here is my code :

pending.java

 button.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View v) 

 SparseBooleanArray checked = listView.getCheckedItemPositions();
 ArrayList<String> selectedItems = new ArrayList<String>();
 String str = null;
 for (int i = 0; i < checked.size(); i++) 
 int position;
 position = checked.keyAt(i);
 if (checked.valueAt(i))
 selectedItems.add(String.valueOf(arrayAdapter.getItem(position)));
 str = listView.getItemAtPosition(i).toString();
 if(ContextCompat.checkSelfPermission(getApplicationContext(),Manifest.permission.SEND_SMS)
 != PackageManager.PERMISSION_GRANTED)
 
 ActivityCompat.requestPermissions(pending.this,new StringManifest.permission.SEND_SMS,MY_PERMISSIONS_REQUEST_SEND_SMS );
 
 else
 
 SmsManager sms = SmsManager.getDefault();
 sms.sendTextMessage(str,null,"#def",null,null);
 Toast.makeText(getApplicationContext(), "Affirmation sent !!",
 Toast.LENGTH_SHORT).show();
 

 
 String StrArr = new String[selectedItems.size()];

 for (int i = 0; i < selectedItems.size(); i++) 
 StrArr[i] = selectedItems.get(i);
 

 Intent intent = new Intent(getApplicationContext(),
 allowed_to.class);
 b = new Bundle();
 b.putStringArray("nibba", StrArr);
 intent.putExtras(b);
 startActivity(intent);
 arrayAdapter.remove(str);

 
 );

allowed_to.java

public class allowed_to extends pending 
public static String resultArr;

public static ListView lvl;
@Override
protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.allowed_to);


 Bundle bundle = getIntent().getExtras();


 resultArr = bundle.getStringArray("nibba");

 lvl = (ListView) findViewById(R.id.lv);
 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
 android.R.layout.simple_list_item_1, resultArr);
 lvl.setAdapter(adapter);
 Toast.makeText(getApplicationContext(), "Allowed successfully !!",
 Toast.LENGTH_SHORT).show();
 

But whenever I open the app, I get this error and my app crashes.

logcat

11-14 19:55:21.782 28136-28136/com.nevermiss.subhamdutta.nevermiss E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.nevermiss.subhamdutta.nevermiss, PID: 28136
 java.lang.RuntimeException: Unable to start activity ComponentInfocom.nevermiss.subhamdutta.nevermiss/com.nevermiss.subhamdutta.nevermiss.allowed_to: java.lang.NullPointerException: **Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getStringArray(java.lang.String)' on a null object reference**
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2434)
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
 at android.app.ActivityThread.access$900(ActivityThread.java:153)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1347)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:148)
 at android.app.ActivityThread.main(ActivityThread.java:5451)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Update: I also tried checking putting an if statement as follows:

package com.nevermiss.subhamdutta.nevermiss;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;

import static android.R.attr.data;

public class allowed_to extends pending 
 public static String resultArr;

 public static ListView lvl;
 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.allowed_to);


 Bundle bundle = getIntent().getExtras();
 if(bundle != null) 

 resultArr = bundle.getStringArray("nibba");

 lvl = (ListView) findViewById(R.id.lv);
 ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
 android.R.layout.simple_list_item_1, resultArr);
 lvl.setAdapter(adapter);
 Toast.makeText(getApplicationContext(), "Allowed successfully !!",
 Toast.LENGTH_SHORT).show();
 
 

Fortunately the app opens up, but the listview is completely empty. How do I view those listview items?

String StrArr = new String[selectedItems.size()];

 for (int i = 0; i < selectedItems.size(); i++) 
 StrArr[i] = selectedItems.get(i);
 

I think, your bug is in this moment. Something wrong with selected items. Log all values of that items, before putting it to the bundle. I think your selected items are empty.

Your class allowed_to extends pending (a real Activity) and maybe its context. So when you call

Bundle bundle = getIntent().getExtras();

you're actually trying to get the pending Activity bundle.

So my best guess is to make allowed_to extend AppCompatActivity as pending does.