below have logcat errors pls suggest me where its wrong and below all codes

Question

1.11/5 (2 votes)

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logcat

06-09 07:40:37.396: E/AndroidRuntime(2328): FATAL EXCEPTION: main
06-09 07:40:37.396: E/AndroidRuntime(2328): Process: com.example.krishnaupahara, PID: 2328
06-09 07:40:37.396: E/AndroidRuntime(2328): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.krishnaupahara/com.example.krishnaupahara.BreakfastService}: java.lang.NullPointerException
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.ActivityThread.access$800(ActivityThread.java:135)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.os.Handler.dispatchMessage(Handler.java:102)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.os.Looper.loop(Looper.java:136)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.ActivityThread.main(ActivityThread.java:5017)
06-09 07:40:37.396: E/AndroidRuntime(2328): at java.lang.reflect.Method.invokeNative(Native Method)
06-09 07:40:37.396: E/AndroidRuntime(2328): at java.lang.reflect.Method.invoke(Method.java:515)
06-09 07:40:37.396: E/AndroidRuntime(2328): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
06-09 07:40:37.396: E/AndroidRuntime(2328): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
06-09 07:40:37.396: E/AndroidRuntime(2328): at dalvik.system.NativeStart.main(Native Method)
06-09 07:40:37.396: E/AndroidRuntime(2328): Caused by: java.lang.NullPointerException
06-09 07:40:37.396: E/AndroidRuntime(2328): at com.example.krishnaupahara.BreakfastService.showCountrySelection(BreakfastService.java:118)
06-09 07:40:37.396: E/AndroidRuntime(2328): at com.example.krishnaupahara.BreakfastService.onCreate(BreakfastService.java:62)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.Activity.performCreate(Activity.java:5231)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
06-09 07:40:37.396: E/AndroidRuntime(2328): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
06-09 07:40:37.396: E/AndroidRuntime(2328): ... 11 more
06-09 07:40:37.506: W/ActivityManager(380): Force finishing activity com.example.krishnaupahara/.BreakfastService

java main file

package com.example.krishnaupahara;
import java.util.ArrayList;
import beanclass.Bfs;
import beanclass.ItemVO;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class BreakfastService extends Activity {

	private ListView ls;
	ArrayAdapter<String> arrayAdapter;
	private ArrayList<String> itemList;
	private ArrayList<Bfs> list;
	private ArrayList<ItemVO> details;
	private SharedPreferences sp;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.breakfast_service);

		list = Utility.getmDetails(this);
		ls = (ListView)findViewById(R.id.list);
		details = new ArrayList<ItemVO>();

		Log.d("TestTag", "Services : "+list.size());
		
		/*Button myButton = (Button) this.findViewById(R.id.button12);
		myButton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {

				showCountrySelection();

			}
		});
*/
		sp = getSharedPreferences("aksp", Context.MODE_PRIVATE);
		String services = sp.getString("services", null);

		String[] itemArray = null;
		itemList = new ArrayList<String>();

		if(services == null || services.equalsIgnoreCase("")){
			showCountrySelection();
		}else{
			itemArray = services.split("\\|");
			for(String c : itemArray){
				itemList.add(c);
			}
			setupScreen();
		}

	}

	private void setupScreen(){

		arrayAdapter = new ArrayAdapter<String>(this, R.layout.breakfast_service, R.id.textView);
		details.clear();
		for(Bfs service: list){
			
			Log.d("TestTag", "Inside item for loop " + itemList.size());
			if(itemList.contains(service.getCategoryName())){
				Log.d("TestTag", "Inside item for loop's if condn");
				service.setEnabled(true);
				for(ItemVO d : service.getGetItemDetails()){
					Log.d("TestTag", "Details per item "+d.getCategoryName());
					arrayAdapter.add(d.getCategoryName());
					details.add(d);
				}
			}
		}

		ls.setAdapter(new MyAdapter(BreakfastService.this, R.id.textView, details));

		ls.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {

				ApplicationCache.getInstance().setValue("value", details.get(position));

			/*	Intent detailsIntent = new Intent(ApnaKhata.this,BankFunctionalities.class);
				startActivity(detailsIntent);*/
			}
		});
		BreakfastService.this.getWindow().getDecorView().invalidate();
	}

	private void showCountrySelection(){

		final Dialog dialog = new Dialog(BreakfastService.this);
		dialog.setContentView(R.layout.breakfast_service);
		ListView lv = (ListView) dialog.findViewById(R.id.list);
		dialog.setCancelable(true);
		dialog.setTitle("Select Services");

		ItemListAdapter dataAdapter = new ItemListAdapter(this,R.layout.list, list);

		lv.setAdapter(dataAdapter);

		Button myButton = (Button) this.findViewById(R.id.button12);

		myButton.setOnClickListener(new OnClickListener() 
		{

			@Override
			public void onClick(View v) 
			{

				String services = "";
				
				int count = 0;
				for(Bfs c : list)
				{
					if(c.isEnabled())
					{
						count++;
						services = services +"|" + c.getCategoryName();
						sp.edit().putString("services", services).commit();
					}
				}
				
				if(count == 0){
					Toast.makeText(BreakfastService.this, "Please select at least one item", Toast.LENGTH_LONG).show();
					return;
				}
				
				itemList.clear();
				
				String[] servicesArray = services.split("\\|");
				for(String c : servicesArray){
					itemList.add(c);
				}
				dialog.dismiss();
				setupScreen();
			}
		});
		dialog.getWindow().getDecorView().invalidate();
		dialog.show();

	}
	
	private class MyAdapter extends ArrayAdapter<ItemVO>{

		private Context context;
		private ArrayList<ItemVO> list;
		private int resId;
		
		public MyAdapter(Context context, int textViewResourceId, ArrayList<ItemVO> list) {
			super(context, textViewResourceId, list);
			this.context = context;
			this.list=list;
			resId = textViewResourceId;
		}
		
		@Override
		public View getView(int position, View convertView, ViewGroup parent) 
		{

			{
				LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
				convertView = vi.inflate(R.layout.list, null);
			}
			
			TextView textview = (TextView) convertView.findViewById(R.id.textViewi);
	        ImageView imageview = (ImageView) convertView.findViewById(R.id.imageViewi);
			
	        
			Log.d("TestTag", "Item Name : "+textview );
			imageview.setImageResource(list .get(position).getItemphoto());
			textview.setText(list .get(position).getItemdescription());
	        

		/*if(position == 0){
				textview.setVisibility(View.VISIBLE);
				textview.setText(list.get(position).getItemdescription());
				//header.setImageResource(list .get(position).getItemphoto());
			}
			else if(position > 0 && position < list.size()-1 && !list.get(position).getItemdescription().
					equalsIgnoreCase(list.get(position-1).getItemdescription())){
				textview.setVisibility(View.VISIBLE);
				textview.setText(list.get(position).getItemdescription());
			}
			*/
			return convertView;
		}
		
	}

}

xml parsing code..

package com.example.krishnaupahara;
import java.io.InputStream;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import beanclass.*;
import android.content.Context;
import android.util.Log;
import android.widget.ListAdapter;
import android.widget.ListView;
public class Utility 
{
	private static ArrayList<Bfs> mDetails;
	
	public static void init(Context context)
	{
		getmDetails(context);
	}

	public static ArrayList<Bfs> getmDetails(Context context) 
	{ 
		if(mDetails == null)
		{
			 mDetails = new ArrayList<Bfs>();
		
		
		try {
			Document doc = parseXML(readFromFile("bs.xml",context));
			NodeList node = doc.getElementsByTagName("Category");
			
			for (int i=0; i<node.getLength(); i++)
			{
				Bfs mtype = new Bfs();
				ArrayList<ItemVO> ServiceName = new ArrayList<ItemVO>();
				
				Log.d("Test", "length"+node.getLength());
				
				
				Element e = (Element) node.item(i);
				
				Element categoryNameE = (Element) e.getElementsByTagName("CategoryName").item(0);
				Element categoryCodeE = (Element) e.getElementsByTagName("CategoryCode").item(0);
				
				String categoryNameS = categoryNameE.getLastChild().getNodeValue();
				String categoryCodeS = categoryCodeE.getLastChild().getNodeValue();
				
				mtype.setCategoryName(categoryNameS);
				mtype.setCategoryCode(categoryCodeS);
				
				
				Log.d("TestTag", "MerchantTypeName from XML is :" +categoryNameS +""+categoryCodeS );
				
				mtype.setCategoryName(categoryNameS);
				
				NodeList node2 = e.getElementsByTagName("Item");
				for (int k=0; k<node2.getLength();k++)
				{
					 ItemVO ItemS = new ItemVO();
					Log.d("Test", "length22"+node2.getLength());
					Element mItemEl = (Element) node2.item(k);
					
					Element itemCodeEl = (Element) mItemEl.getElementsByTagName("Itemcode").item(0);
					Element itemDescriptionEl = (Element) mItemEl.getElementsByTagName("Itemdesription").item(0);
					Element itemPhotoEl = (Element) mItemEl.getElementsByTagName("Itemphoto").item(0);	
					
					
					ItemS.setItemdescription(itemDescriptionEl.getLastChild().getNodeValue());
					ItemS.setItemphoto((Integer.valueOf(itemPhotoEl.getLastChild().getNodeValue())));
					ItemS.setCategoryName(categoryNameS);
					ItemS.setItemcode(itemCodeEl.getLastChild().getNodeValue());
				
					
					ServiceName.add(ItemS);
				    
				}
				mtype.setGetItemDetails(ServiceName);
				mDetails.add(mtype);
				
				Log.d("TestTag", "Values in arraylist in XML"+mDetails.toString());
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		}
		
		return mDetails;
	}// End of getmDetails

	public static Document parseXML(InputSource source) throws Exception 
	{
		
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		DocumentBuilder db;
		Document doc = null;
		
		try {
			db = dbf.newDocumentBuilder();
			doc = db.parse(source);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			throw e;
		}
		
		return doc;
	}// End of parseXML

	public static InputSource readFromFile(String fileName, Context context) 
	{
		InputSource inputSource = null;
		InputStream fIn = null;
		
		try {
			fIn = context.getResources().getAssets().open(fileName);
			inputSource = new InputSource(fIn);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return inputSource;
	}
	
}

breakfast xml file

<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"
>

<listview> android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >

<Button
android:id="@+id/button12"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:text="@string/addtocart" />

list xml file

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"> android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<linearlayout> android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="2dip"
android:removed="#336699" >

<ImageView
android:id="@+id/imageViewi"
android:layout_width="50dip"
android:layout_height="50dip"
android:src="@drawable/ic_launcher" />

<textview>
android:id="@+id/textViewi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip"
android:layout_marginTop="8dip"
android:text="Middle Text"
android:textAppearance="?android:attr/textAppearanceMedium" />

<checkbox>
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Checkbox" />

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"> android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<linearlayout> android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="2dip"
android:removed="#336699" >

<ImageView
android:id="@+id/imageViewi"
android:layout_width="50dip"
android:layout_height="50dip"
android:src="@drawable/ic_launcher" />

<textview>
android:id="@+id/textViewi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dip"
android:layout_marginTop="8dip"
android:text="Middle Text"
android:textAppearance="?android:attr/textAppearanceMedium" />

<checkbox>
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Checkbox" />

Posted 9-Jun-14 2:07am

Deepak Drs

Updated 9-Jun-14 2:12am

v2

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Comments

SRS(The Coder) 9-Jun-14 9:44am

Feeling like reading a novel here, can you please do a excercise to keep it pre-size and it should have a comment which will make me understand the things properly from your code to try for solving it..?

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Richard MacCutchan · Answer 1 · 2014-06-09T06:56:00

The key message is

06-09 07:40:37.396: E/AndroidRuntime(2328): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.krishnaupahara/com.example.krishnaupahara.BreakfastService}: java.lang.NullPointerException

You are using a reference that has not been initialised to point to an actual object. Use your debugger to trace the code and find out why this is happening.