I am getting a NullPointerException. Below you can find my Logcat and the relevant code.
Logcat:
12-23 00:17:35.330: E/AndroidRuntime(2019): FATAL EXCEPTION: main
12-23 00:17:35.330: E/AndroidRuntime(2019): Process: com.android.timesheet, PID: 2019
12-23 00:17:35.330: E/AndroidRuntime(2019): java.lang.NullPointerException
12-23 00:17:35.330: E/AndroidRuntime(2019): at com.android.timesheet.adapter.CustomCursorAdapter$1.onClick(CustomCursorAdapter.java:54)
12-23 00:17:35.330: E/AndroidRuntime(2019): at android.view.View.performClick(View.java:4438)
12-23 00:17:35.330: E/AndroidRuntime(2019): at android.view.View$PerformClick.run(View.java:18422)
12-23 00:17:35.330: E/AndroidRuntime(2019): at android.os.Handler.handleCallback(Handler.java:733)
12-23 00:17:35.330: E/AndroidRuntime(2019): at android.os.Handler.dispatchMessage(Handler.java:95)
12-23 00:17:35.330: E/AndroidRuntime(2019): at android.os.Looper.loop(Looper.java:136)
12-23 00:17:35.330: E/AndroidRuntime(2019): at android.app.ActivityThread.main(ActivityThread.java:5017)
12-23 00:17:35.330: E/AndroidRuntime(2019): at java.lang.reflect.Method.invokeNative(Native Method)
12-23 00:17:35.330: E/AndroidRuntime(2019): at java.lang.reflect.Method.invoke(Method.java:515)
12-23 00:17:35.330: E/AndroidRuntime(2019): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
12-23 00:17:35.330: E/AndroidRuntime(2019): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
12-23 00:17:35.330: E/AndroidRuntime(2019): at dalvik.system.NativeStart.main(Native Method)
CustomCursorAdapter.java:
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.TextView;
import com.android.timesheet.ModifyMember;
import com.android.timesheet.R;
public class CustomCursorAdapter extends CursorAdapter {
Button delete_btn;
TextView memID_tv, memName_tv;
#SuppressWarnings("deprecation")
public CustomCursorAdapter(Activity context, Cursor c) {
super(context, c);
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
// when the view will be created for first time,
// we need to tell the adapters, how each item will look
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View retView = inflater.inflate(R.layout.single_row_item, parent, false);
return retView;
}
#Override
public void bindView(View view, final Context context, Cursor cursor) {
// here we are setting our data
// that means, take the data from the cursor and put it in views
TextView textViewPersonName = (TextView) view.findViewById(R.id.tv_person_name);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
delete_btn=(Button)view.findViewById(R.id.delete_btn);
delete_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
memID_tv = (TextView)v.findViewById(R.id.member_id);
memName_tv = (TextView)v.findViewById(R.id.member_name);
String memberID_val = memID_tv.getText().toString();; ---->54th Line
String memberName_val = memName_tv.getText().toString();
Intent i = new Intent(context,
ModifyMember.class);
i.putExtra("memberName", memberName_val);
i.putExtra("memberID", memberID_val);
((Activity)context).startActivity(i);
}
});
}
}
I am using a delete button to delete all the listview row items. At that point I am getting the NullPointerException.
Use view(view of row) instead of v parameter of onClick method which is view of Button :
delete_btn=(Button)view.findViewById(R.id.delete_btn);
delete_btn.setTag(view);
delete_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View rowview=(View)v.getTag();
memID_tv = (TextView)rowview.findViewById(R.id.member_id);
memName_tv = (TextView)rowview.findViewById(R.id.member_name);
}
});
Use view instead of v
memID_tv = (TextView)view.findViewById(R.id.member_id);
In bindview try this-
if (view == null) {
view = inflater.inflate(R.layout.single_row_item, parent, null);
}
TextView textViewPersonName = (TextView) view.findViewById(R.id.tv_person_name);
textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));
delete_btn=(Button)view.findViewById(R.id.delete_btn);
.
.
.
you are getting the view from clicked view, but you have to get the views from the root view.
memID_tv = (TextView)v. findViewById(R.id.member_id);
memName_tv = (TextView)v.findViewById(R.id.member_name);
change these lines into this:
memID_tv = (TextView)view. findViewById(R.id.member_id);
memName_tv = (TextView)view.findViewById(R.id.member_name);
Related
I am following slidenerd Material design tutorial(Android RecyclerView Example part1,2,3,4) & I am using real device to test my android application.I have successfully build navigation drawer & when I try to add RecylerView into it by adding adapter (ThalakazAdapter.java) , app unfortunately get stopped.
This is my NavigationDrawerFragment.java
package com.thaalakaz.nadeesha.materialdesignapp1;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
//import android.app.Fragment;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.support.v4.app.Fragment;
import java.util.ArrayList;
import java.util.List;
/**
* A simple {#link Fragment} subclass.
*/
public class NavigationDrawerFragment extends Fragment {
private RecyclerView recyclerView;
public static final String PREF_FILE_NAME = "testpref";
public static final String KAY_USER_LEARNED_DRAWER ="user_learned_drawer";
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private ThalakazAdapter adapter;
private boolean mUserLearnedDrawer;
private boolean mFromSavedInstanceState;
private View containerView;
public NavigationDrawerFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mUserLearnedDrawer=Boolean.valueOf(readFromPreferences(getActivity(),KAY_USER_LEARNED_DRAWER,"false"));
if (savedInstanceState != null){
mFromSavedInstanceState = true;
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawer_layout);
adapter = new ThalakazAdapter(getActivity(),getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return layout;
}
public static List<Information> getData(){
List<Information> data = new ArrayList<>();
int[] icons ={R.drawable.ic_m,R.drawable.ic_m1,R.drawable.ic_m2,R.drawable.ic_m3};
String[] titles = {"Nadeesha","Thilakarathne","Semini","Roshani"};
for (int i=0;i<titles.length && i<icons.length;i++){
Information current = new Information();
current.iconId = icons[i];
current.titlel = titles[i];
data.add(current);
}
return data;
}
public void setUp(int fragmentId, DrawerLayout drawerLayout, final Toolbar toolbar) {
containerView = getActivity().findViewById(fragmentId);
mDrawerLayout = drawerLayout;
mDrawerToggle = new ActionBarDrawerToggle(getActivity(),drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close){
#Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
if(!mUserLearnedDrawer){
mUserLearnedDrawer = true;
saveToPreferences(getActivity(),KAY_USER_LEARNED_DRAWER,mUserLearnedDrawer+"");
}
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerClosed(View drawerView) {
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
#Override
public void onDrawerSlide(View drawerView, float slideOffset) {
if (slideOffset<0.6){
toolbar.setAlpha(1-slideOffset);
}
}
};
if (!mUserLearnedDrawer && mFromSavedInstanceState){
mDrawerLayout.openDrawer(containerView);
}
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
}
public static void saveToPreferences(Context context,String prferenceName,String preferenceValue){
SharedPreferences sharedPreferences = context.getSharedPreferences(PREF_FILE_NAME,Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(prferenceName,preferenceValue);
editor.apply();
}
public static String readFromPreferences(Context context,String prferenceName,String defaultValue){
SharedPreferences sharedPreferences = context.getSharedPreferences(PREF_FILE_NAME,Context.MODE_PRIVATE);
return sharedPreferences.getString(prferenceName,defaultValue);
}
}
This is my Adapter (ThalakazAdapter.java)
package com.thaalakaz.nadeesha.materialdesignapp1;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;
/**
* Created by hp on 7/22/2015.
*/
public class ThalakazAdapter extends RecyclerView.Adapter <ThalakazAdapter.myViewHolder>{
private LayoutInflater inflater;
List<Information> data = Collections.emptyList();
public ThalakazAdapter(Context context, List<Information> data){
inflater=LayoutInflater.from(context);
this.data = data;
}
#Override
public myViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.custom_row, parent, false);
myViewHolder holder = new myViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(myViewHolder holder, int position) {
Information current = data.get(position);
holder.title.setText(current.titlel);
holder.icon.setImageResource(current.iconId);
}
#Override
public int getItemCount() {
return 0;
}
class myViewHolder extends RecyclerView.ViewHolder{
ImageView icon;
TextView title;
public myViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.listText);
icon = (ImageView) itemView.findViewById(R.id.listIcon);
}
}
}
My information.java class
package com.thaalakaz.nadeesha.materialdesignapp1;
/**
* Created by hp on 7/22/2015.
*/
public class Information {
int iconId;
String titlel;
}
You can view my entire project from here
Logcat
07-21 22:32:07.101 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 D/dalvikvm﹕ Late-enabling CheckJNI
07-21 22:32:07.111 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 I/SystemProperties﹕ get key=ro.kernel.android.tracing
07-21 22:32:07.281 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 I/dalvikvm﹕ Could not find method android.view.ViewGroup.onRtlPropertiesChanged, referenced from method android.support.v7.widget.Toolbar.onRtlPropertiesChanged
07-21 22:32:07.281 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 W/dalvikvm﹕ VFY: unable to resolve virtual method 14685: Landroid/view/ViewGroup;.onRtlPropertiesChanged (I)V
07-21 22:32:07.281 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0007
07-21 22:32:07.301 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
07-21 22:32:07.301 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 W/dalvikvm﹕ VFY: unable to resolve virtual method 414: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
07-21 22:32:07.301 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
07-21 22:32:07.311 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
07-21 22:32:07.311 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 W/dalvikvm﹕ VFY: unable to resolve virtual method 436: Landroid/content/res/TypedArray;.getType (I)I
07-21 22:32:07.311 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
07-21 22:32:07.381 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 D/AndroidRuntime﹕ Shutting down VM
07-21 22:32:07.381 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41027208)
07-21 22:32:07.391 7099-7099/com.thaalakaz.nadeesha.materialdesignapp1 E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.thaalakaz.nadeesha.materialdesignapp1/com.thaalakaz.nadeesha.materialdesignapp1.MainActivity}: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
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:787)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #24: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:249)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:106)
at com.thaalakaz.nadeesha.materialdesignapp1.MainActivity.onCreate(MainActivity.java:20)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.thaalakaz.nadeesha.materialdesignapp1.NavigationDrawerFragment.onCreateView(NavigationDrawerFragment.java:63)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:924)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1116)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1218)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2170)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:300)
at android.support.v7.app.AppCompatDelegateImplV7.callActivityOnCreateView(AppCompatDelegateImplV7.java:838)
at android.support.v7.app.AppCompatDelegateImplV11.callActivityOnCreateView(AppCompatDelegateImplV11.java:34)
at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:826)
at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:668)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:739)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:249)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:106)
at com.thaalakaz.nadeesha.materialdesignapp1.MainActivity.onCreate(MainActivity.java:20)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
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:787)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
at dalvik.system.NativeStart.main(Native Method)
fragment_navigation_drawer.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#DADADA"
tools:context="com.thaalakaz.nadeesha.materialdesignapp1.NavigationDrawerFragment">
<LinearLayout
android:id="#+id/containerDrawerImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#FF6F00">
<ImageView
android:layout_width="280dp"
android:layout_height="140dp"
android:src = "#drawable/dog"
android:layout_margin="16dp"/>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/drawerList"
android:layout_height="match_parent"
android:layout_width="wrap_content">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
in your onCreateView your are looking for the wrong id. Change
recyclerView = (RecyclerView) layout.findViewById(R.id.drawer_layout);
with
recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);
I also noticed that in your Adapter's constructor, you are assingn this.data to itself. Change
this.data = this.data;
to
this.data = data
and getItemCount shouldn't return 0, but the size of data (if it is not null)
I am trying to pass a String form one activity to another in my app, however I keep getting a null pointer error. This is what shows up in my LogCat:
12-29 02:49:03.256: D/(663): HostConnection::get() New Host Connection established 0x96cb850, tid 663
12-29 02:49:06.288: W/KeyCharacterMap(663): No keyboard for id 0
12-29 02:49:06.288: W/KeyCharacterMap(663): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
12-29 02:49:09.600: D/AndroidRuntime(663): Shutting down VM
12-29 02:49:09.600: W/dalvikvm(663): threadid=1: thread exiting with uncaught exception (group=0xb5f444f0)
12-29 02:49:09.604: E/AndroidRuntime(663): FATAL EXCEPTION: main
12-29 02:49:09.604: E/AndroidRuntime(663): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloworld3/com.example.helloworld3.FloorPlan}: java.lang.NullPointerException
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.os.Handler.dispatchMessage(Handler.java:99)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.os.Looper.loop(Looper.java:130)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-29 02:49:09.604: E/AndroidRuntime(663): at java.lang.reflect.Method.invokeNative(Native Method)
12-29 02:49:09.604: E/AndroidRuntime(663): at java.lang.reflect.Method.invoke(Method.java:507)
12-29 02:49:09.604: E/AndroidRuntime(663): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-29 02:49:09.604: E/AndroidRuntime(663): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-29 02:49:09.604: E/AndroidRuntime(663): at dalvik.system.NativeStart.main(Native Method)
12-29 02:49:09.604: E/AndroidRuntime(663): Caused by: java.lang.NullPointerException
12-29 02:49:09.604: E/AndroidRuntime(663): at com.example.helloworld3.FloorPlan.onCreate(FloorPlan.java:24)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-29 02:49:09.604: E/AndroidRuntime(663): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-29 02:49:09.604: E/AndroidRuntime(663): ... 11 more
12-29 02:49:12.316: D/(677): HostConnection::get() New Host Connection established 0x96c5790, tid 677
This is my ManActivity.java:
package com.example.helloworld3;
import android.support.v7.app.ActionBarActivity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.provider.ContactsContract.RawContacts.Data;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText destination = (EditText)findViewById(R.id.roomdinput);
final Button floorPlan = (Button)findViewById(R.id.floorPlanButton);
floorPlan.setOnClickListener(new View.OnClickListener() {
public void onClick(View v){
String roomName = destination.getText().toString();
Bundle myb = new Bundle();
myb.putString("key1", roomName);
Intent a = new Intent(MainActivity.this, FloorPlan.class);
a.putExtras(myb);
startActivity(a);
startActivity(new Intent("com.example.helloworld3.FLOORPLAN"));
}
});
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
And this is my FloorPan.java:
package com.example.helloworld3;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class FloorPlan extends Activity{
DrawView2 drawView;
String roomName2;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.floorplan);
Bundle myb2= getIntent().getExtras();
roomName2 = myb2.getString("key1");
drawView = new DrawView2(this);
drawView.setBackgroundResource(R.drawable.tait1st);
setContentView(drawView);
}
public class DrawView2 extends View {
Paint paint = new Paint();
float ux, dx, rx,lx;
public String getRoomName(){
return roomName2;
}
public void setCoordinates(){
if(roomName2 == "C154"){
ux =90;
dx = 250;
rx = 90;
lx = 400;
}else {
ux =76;
dx = 98;
rx = 140;
lx = 300;
}
};
public DrawView2(Context context) {
super(context);
paint.setColor(Color.RED);
//roomName2 = drawView.getTag();
}
#Override
public void onDraw(Canvas canvas) {
canvas.drawLine(ux, dx , rx, lx, paint);
canvas.drawLine(20, 0, 0, 20, paint);
canvas.drawCircle(150, 400, 30, paint);
}
}
}
Thank you for all your help!
I think , This line in OnClickListener of floorPlan in your MainActivity causing problem :
startActivity(new Intent("com.example.helloworld3.FLOORPLAN"));
putString method is correct. It's inherited from android.os.BaseBundle.
The logcat shows your bundle get from intent.getExtras() is null:
Bundle myb2= getIntent().getExtras();
roomName2 = myb2.getString("key1");//here myb2 is null
Maybe you should override onNewIntent to setIntent:
#Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
}
Why you have started activity 2 times in below code ?
Intent a = new Intent(MainActivity.this, FloorPlan.class);
a.putExtras(myb); startActivity(a);
startActivity(new Intent("com.example.helloworld3.FLOORPLAN")); // this intent doesnt`t have bundle
This might be the reason which lead where Bundle object is null in intent and causing nullpointerexception.
I am stuck trying to reading from a .txt file a name and last name into a java application, I have tryed on first method with AssetManager but my application Crash when I enter it.
The second method is with inputstream but I get 3 errors:
Description Resource Path Location Type
ByteArrayOutputStream cannot be resolved to a type MainActivity.java /MyInfo/src/com/example/myinfo line 64 Java Problem
ByteArrayOutputStream cannot be resolved to a type MainActivity.java /MyInfo/src/com/example/myinfo line 64 Java Problem
dummytext cannot be resolved or is not a field MainActivity.java /MyInfo/src/com/example/myinfo line 55 Java Problem
MainActivity.java
package com.example.myinfo;
import java.io.IOException;
import java.io.InputStream;
import android.os.Bundle;
import android.content.res.AssetManager;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/*
TextView name = (TextView) findViewById(R.id.name);
AssetManager assetManager = getAssets();
InputStream input;
try {
input = assetManager.open("info.txt");
int size = input.available();
byte[] buffer = new byte[size];
input.read(buffer);
input.close();
// byte buffer into a string
String text = new String(buffer);
nume.setText(text);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
*/
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
TextView dummytext = (TextView) findViewById(R.id.dummytext);
dummytext.setText(readText());
}
private String readText() {
InputStream inputStream = getResources().openRawResource(R.raw.dummytext);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int i;
try {
i = inputStream.read();
while(i!=-1){
byteArrayOutputStream.write(i);
i = inputStream.read();
}
inputStream.close();
}catch (IOException e){
e.printStackTrace();
}
return byteArrayOutputStream.toString();
}
#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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
}
and my XML is this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.myinfo.MainActivity$PlaceholderFragment" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="87dp"
android:text="Adauga Fisier" />
<TextView
android:id="#+id/dummytext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/nume"
android:layout_below="#+id/nume"
android:layout_marginTop="29dp"
android:text="Prenume"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/button1"
android:layout_marginRight="14dp"
android:layout_marginTop="65dp"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
I don't understand what I did wrong.
When I run the code that is now in Comments I notice that I get in Logcat NullPointerException.
LogCat:
04-07 10:06:11.298: I/dalvikvm(275): Could not find method android.content.pm.PackageManager.getActivityLogo, referenced from method android.support.v7.internal.widget.ActionBarView.<init>
04-07 10:06:11.298: W/dalvikvm(275): VFY: unable to resolve virtual method 318: Landroid/content/pm/PackageManager;.getActivityLogo (Landroid/content/ComponentName;)Landroid/graphics/drawable/Drawable;
04-07 10:06:11.298: D/dalvikvm(275): VFY: replacing opcode 0x6e at 0x008b
04-07 10:06:11.308: I/dalvikvm(275): Could not find method android.content.pm.ApplicationInfo.loadLogo, referenced from method android.support.v7.internal.widget.ActionBarView.<init>
04-07 10:06:11.308: W/dalvikvm(275): VFY: unable to resolve virtual method 314: Landroid/content/pm/ApplicationInfo;.loadLogo (Landroid/content/pm/PackageManager;)Landroid/graphics/drawable/Drawable;
04-07 10:06:11.308: D/dalvikvm(275): VFY: replacing opcode 0x6e at 0x0099
04-07 10:06:11.318: D/dalvikvm(275): VFY: dead code 0x008e-0092 in Landroid/support/v7/internal/widget/ActionBarView;.<init> (Landroid/content/Context;Landroid/util/AttributeSet;)V
04-07 10:06:11.318: D/dalvikvm(275): VFY: dead code 0x009c-00a0 in Landroid/support/v7/internal/widget/ActionBarView;.<init> (Landroid/content/Context;Landroid/util/AttributeSet;)V
04-07 10:06:11.488: D/AndroidRuntime(275): Shutting down VM
04-07 10:06:11.488: W/dalvikvm(275): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
04-07 10:06:11.498: E/AndroidRuntime(275): FATAL EXCEPTION: main
04-07 10:06:11.498: E/AndroidRuntime(275): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myinfo/com.example.myinfo.MainActivity}: java.lang.NullPointerException
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.os.Handler.dispatchMessage(Handler.java:99)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.os.Looper.loop(Looper.java:123)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-07 10:06:11.498: E/AndroidRuntime(275): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 10:06:11.498: E/AndroidRuntime(275): at java.lang.reflect.Method.invoke(Method.java:521)
04-07 10:06:11.498: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-07 10:06:11.498: E/AndroidRuntime(275): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-07 10:06:11.498: E/AndroidRuntime(275): at dalvik.system.NativeStart.main(Native Method)
04-07 10:06:11.498: E/AndroidRuntime(275): Caused by: java.lang.NullPointerException
04-07 10:06:11.498: E/AndroidRuntime(275): at com.example.myinfo.MainActivity.onCreate(MainActivity.java:42)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-07 10:06:11.498: E/AndroidRuntime(275): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-07 10:06:11.498: E/AndroidRuntime(275): ... 11 more
04-07 10:06:18.688: I/Process(275): Sending signal. PID: 275 SIG: 9
use this code
`InputStream input;
AssetManager assetManager = getAssets();
try {
input = assetManager.open("helloworld.txt");
int size = input.available();
byte[] buffer = new byte[size];
input.read(buffer);
input.close();
// byte buffer into a string
String text = new String(buffer);
dummytext.setText(text);
} catch (IOException e) {
e.printStackTrace();
}
`
This code open an InputStream for the file from assets manager, get size from file content, allocate byte buffer with this size and read file in this buffer, after this create new string from buffer and set this string to your textview
Eclipse finds no errors in my code, but when I try to run the app on an emulator, it opens and then immediately crashes. Logcat gives me the vague nullPointerException error. I can comment out the onKeyDown method, and then it runs just fine. But of course, I can't use the back key to go back, it will just close out the app.
My code is as follows:
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.ViewFlipper;
public class MainActivity extends Activity {
static String[] items = {"Campaign", "Multiplayer", "Zombies"};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listView = (ListView) findViewById(R.id.listview);
final ViewFlipper viewflipper = (ViewFlipper) findViewById(R.id.viewflipper1);
listView.setAdapter(new BaseAdapter(){
public int getCount() {
return items.length;
}
public Object getItem(int position) {
return items[position];
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.list_row, null);
TextView textView = (TextView) view.findViewById(R.id.TextView01);
textView.setText(items[position]);
textView.setTextColor(Color.rgb(255,106,0));
textView.setTextSize(24);
TextView textView1 = (TextView) findViewById(R.id.textView1);
textView1.setTextColor(Color.rgb(255,106,0));
return view;
}});
listView.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
if (position == 0) {
viewflipper.showNext();
}if (position == 1) {
viewflipper.showNext();
viewflipper.showNext();
}if (position == 2) {
viewflipper.showNext();
viewflipper.showNext();
viewflipper.showNext();
}}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
ViewFlipper viewflipper = (ViewFlipper) findViewById(R.id.viewflipper1);
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
if(viewflipper.getDisplayedChild() == 0){
viewflipper.showPrevious();
}if(viewflipper.getDisplayedChild() == 1){
viewflipper.showPrevious();
viewflipper.showPrevious();
}if(viewflipper.getDisplayedChild() == 2){
viewflipper.showPrevious();
viewflipper.showPrevious();
viewflipper.showPrevious();
}
return true;
}
return super.onKeyDown(keyCode, event);
}
};
My Logcat is as follows:
01-21 11:38:46.151: E/AndroidRuntime(760): FATAL EXCEPTION: main
01-21 11:38:46.151: E/AndroidRuntime(760): java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.example.blackopsiiexperience/com.example.blackopsiiexperience.MainActivity}: java.lang.NullPointerException
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.ActivityThread.access$600(ActivityThread.java:141)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.os.Handler.dispatchMessage(Handler.java:99)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.os.Looper.loop(Looper.java:137)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.ActivityThread.main(ActivityThread.java:5039)
01-21 11:38:46.151: E/AndroidRuntime(760): at java.lang.reflect.Method.invokeNative(Native Method)
01-21 11:38:46.151: E/AndroidRuntime(760): at java.lang.reflect.Method.invoke(Method.java:511)
01-21 11:38:46.151: E/AndroidRuntime(760): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
01-21 11:38:46.151: E/AndroidRuntime(760): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
01-21 11:38:46.151: E/AndroidRuntime(760): at dalvik.system.NativeStart.main(Native Method)
01-21 11:38:46.151: E/AndroidRuntime(760): Caused by: java.lang.NullPointerException
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.Activity.findViewById(Activity.java:1839)
01-21 11:38:46.151: E/AndroidRuntime(760): at com.example.blackopsiiexperience.MainActivity.<init>(MainActivity.java:73)
01-21 11:38:46.151: E/AndroidRuntime(760): at java.lang.Class.newInstanceImpl(Native Method)
01-21 11:38:46.151: E/AndroidRuntime(760): at java.lang.Class.newInstance(Class.java:1319)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
01-21 11:38:46.151: E/AndroidRuntime(760): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
01-21 11:38:46.151: E/AndroidRuntime(760): ... 11 more
Any suggestions?
move
ViewFlipper viewflipper = (ViewFlipper) findViewById(R.id.viewflipper1);
inside onCreate of Activity after setting layout for Activity
EDIT :
declare Viewflipper as class level field to access it through out class instead of method level as :
public class MainActivity extends Activity {
static String[] items = {"Campaign", "Multiplayer", "Zombies"};
ListView listView;
ViewFlipper viewflipper; //<<<< declare here
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listview);
viewflipper = (ViewFlipper) findViewById(R.id.viewflipper1);
//your code here.....
I have this code for an expandable list, I want to have a checkbox in the childgroups of the list view, and check if one of the checkboxes is checked.
The problem is that when I check if the checkbox is checked I get a NULL Pointer Exception.
Can you please tell me whats wrong?
here's my code - I've edited the code to inflate a view of the child_row.xml that holds that checkbox but I still get that null pointer, what am I doing wrong?!?!
package send.Shift;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.ExpandableListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
public class Shifts extends ExpandableListActivity implements
OnCheckedChangeListener {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.list);
SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter(
this, createGroupList(), R.layout.group_row,
new String[] { "Group Item" }, new int[] { R.id.row_name },
createChildList(), R.layout.child_row,
new String[] { "Sub Item" }, new int[] { R.id.grp_child });
getExpandableListView().setGroupIndicator(
getResources().getDrawable(R.drawable.expander_group));
ExpandableListView EX = (ExpandableListView) findViewById(android.R.id.list);
EX.setAdapter(expListAdapter);
final CheckBox childBox = (CheckBox) findViewById(R.id.childBOX);
final TextView choosenGroup = (TextView) findViewById(R.id.choosen);
LayoutInflater inflater = LayoutInflater.from(Shifts.this);
View view2 = inflater.inflate(R.layout.child_row, null);
childBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(childBox.isChecked() == true){
choosenGroup.setText("Shift Set");
}
}
});
}
Here is some of the Logcat log:
12-23 07:38:00.644: W/dalvikvm(880): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-23 07:38:00.654: E/AndroidRuntime(880): FATAL EXCEPTION: main
12-23 07:38:00.654: E/AndroidRuntime(880): java.lang.RuntimeException: Unable to start activity ComponentInfo{send.Shift/send.Shift.Shifts}: java.lang.NullPointerException
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.os.Handler.dispatchMessage(Handler.java:99)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.os.Looper.loop(Looper.java:123)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-23 07:38:00.654: E/AndroidRuntime(880): at java.lang.reflect.Method.invokeNative(Native Method)
12-23 07:38:00.654: E/AndroidRuntime(880): at java.lang.reflect.Method.invoke(Method.java:507)
12-23 07:38:00.654: E/AndroidRuntime(880): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-23 07:38:00.654: E/AndroidRuntime(880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-23 07:38:00.654: E/AndroidRuntime(880): at dalvik.system.NativeStart.main(Native Method)
12-23 07:38:00.654: E/AndroidRuntime(880): Caused by: java.lang.NullPointerException
12-23 07:38:00.654: E/AndroidRuntime(880): at send.Shift.Shifts.onCreate(Shifts.java:41)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-23 07:38:00.654: E/AndroidRuntime(880): ... 11 more
If you get a nullpointer on a certain line, something on that line is null. If it is the if(childBox.isChecked() line, probably childBox is null. Hard to say without the stack, but most probable cause is the line where you retrieve that checkbox.
final CheckBox childBox = (CheckBox) findViewById(R.id.childBOX);
Might be returning null, and this could be for several reasons. It could be your id is childBox instead of childBOX. Or that it is not in R.layout.list.
The best thing you can do is start debugging. What line is the error. Find the object that is null. Find out why it is null and if that is expected or not.
Instead of checking the childBox.isChecked() you can use the isChecked value. So your code would look like this:
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked == true){
choosenGroup.setText("Shift Set");
}
}
Check your layout list.xml I think this layout may is missing android:id="#+id/childBOX" for Check Box or android:id="#+id/choosen" for TextView
Check the folowin sample
<CheckBox android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/childBOX"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/choosen"/>