I'm trying to read a simple text file that is a list of words and numbers and display it in a scrollable list in an Android application.
I'm not having any issue using arbitrary string arrays that I specify in the code such as the string arrays "myStringArray" or "alphabts." However, when I try to read a text file and use it in one of the lists, my app crashes.
It could be something as simple as the format of the text file is wrong, or that I should have the file in a different location and be referencing it from there.
Thanks for the help!
Java Code:
package com.coderzheaven.pack;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class AlphabetListDemo extends Activity {
//String of alphabets //
String[] myStringArray = {"Calories","Protein","Carbs"};
String[] alphabts = {"1","2","3"};
ListView L1, L2;
myAdapter myadp;
myAdapter2 myadp2;
String prod_arr[] = {};
InputStream is = this.getResources().openRawResource(
R.drawable.filetoread);
DataInputStream myDIS = new DataInputStream(is);
ArrayList<String> list = new ArrayList<String>();
final String[] bob = list.toArray(new String[list.size()]);
//final String[] bob = alphabts; Here if I comment out the four
//lines above and and use the alphabts string it works fine
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
L1 = (ListView)findViewById(R.id.list1);
L2 = (ListView)findViewById(R.id.list2);
myadp = new myAdapter(this,alphabts);
L2.setAdapter(myadp);
L2.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
setProducts(arg2);
}
});
}
public void setProducts(int number){
prod_arr = new String[25];
// adding some dummy data //
for(int i = 0; i < 25 ; i++){
prod_arr[i] = bob[number];
}
//setting the adapter in listview //
myadp2 = new myAdapter2(AlphabetListDemo.this,prod_arr);
L1.setAdapter(myadp2);
}
class myAdapter extends ArrayAdapter<String>
{
TextView label;
ImageView image;
View row;
public myAdapter(Context context,String[] arr)
{
super(context, android.R.layout.simple_list_item_1, arr);
}
public View getView(final int position, View convertView, ViewGroup parent)
{
try{
LayoutInflater inflater=getLayoutInflater();
row = inflater.inflate(R.layout.lv_rows, parent, false);
label = (TextView)row.findViewById(R.id.item_title);
label.setText(myStringArray[position]);
label.setTextColor(Color.YELLOW);
}catch(Exception e){
}
return row;
}
}
// adapter for second list.....
class myAdapter2 extends ArrayAdapter<String>
{
TextView label;
ImageView image;
View row;
public myAdapter2(Context context,String[] arr)
{
super(context, android.R.layout.simple_list_item_1, arr);
}
public View getView(final int position, View convertView, ViewGroup parent)
{
try{
LayoutInflater inflater=getLayoutInflater();
row = inflater.inflate(R.layout.lv_rows, parent, false);
label = (TextView)row.findViewById(R.id.item_title);
label.setText(prod_arr[position]);
label.setTextColor(Color.WHITE);
}catch(Exception e){
}
return row;
}
}
}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
android:orientation="horizontal">
<!-- this list contains products -->
<ListView
android:id="@+id/list1"
android:layout_width="192dp"
android:layout_height="wrap_content"
android:layout_marginBottom="5dip"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:layout_marginTop="5dip"
android:cacheColorHint="#00000000"
android:dividerHeight="1px"
android:drawSelectorOnTop="false"
android:fadingEdge="vertical"
android:padding="0dip"
android:scrollbars="none"
android:smoothScrollbar="true"
android:soundEffectsEnabled="true" />
<ListView
android:id="@+id/list2"
android:layout_weight="4"
android:cacheColorHint="#00000000"
android:scrollbars="none"
android:fadingEdge="vertical"
android:soundEffectsEnabled="true"
android:dividerHeight="1px"
android:padding="0dip"
android:smoothScrollbar="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawSelectorOnTop="false"
android:layout_marginTop="5dip"
android:layout_marginLeft="5dip"
android:layout_marginRight="5dip"
android:layout_marginBottom="5dip" />
</LinearLayout>
lv_rows.xml in the same location as main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="7dp"
>
<TextView
android:id="@+id/item_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:text="Main Item"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="14dp"
android:textStyle="normal" />
</RelativeLayout>
