Before I get started explaining what is going on, I just wanted to say that I have read a similar question but none of the answers on that were able to solve my problem. My app still crashes when I use the methods discussed in the previous question.
I have a text file where each line has an acronym, term, and definition separated by a percent sign. When a user searches for a specific acronym or term, it splits the acronym, term and definition by the percent sign and displays each index of the array on the screen. I want to only display the acronym in the listview which is always myArray[0]. I will figure out the clicking part on my own but right now I'm just having an issue getting the acronyms to display. In a previous answer, at the end, the user said to put: ArrayAdapter adapter = new ArrayAdapter(this,R.id.yourListView,lines) but this did caused an error for me as the middle thing should be a layout. Here is my code: **Note: the piece of code that is giving me an error is surrounded by stars.
package com.redacted.CSRenA.acronymlookup;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
public class Browse extends AppCompatActivity {
ListView listView= (ListView) findViewById(R.id.acrolist);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_browse);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
try{
InputStream is = this.getResources().openRawResource(R.raw.acronyms2);
InputStreamReader inputreader = new InputStreamReader(is);
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
ArrayList<String> lines = new ArrayList<String>();
boolean hasNextLine =true;
String[] str;
while (hasNextLine){
String line = reader.readLine();
str = line.split("%", 5);
lines.add(str[0]);
hasNextLine = line != null;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,**R.id.acrolist**,lines);
listView.setAdapter(adapter);
is.close();
}
catch(java.io.FileNotFoundException e){
}catch(java.io.IOException e){
}
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}
Logs (Scroll right):
07-12 15:57:23.804 13752-13752/com.nesassociates.laurenanderson.acronymlookup E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.nesassociates.laurenanderson.acronymlookup, PID: 13752
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.nesassociates.laurenanderson.acronymlookup/com.nesassociates.laurenanderson.acronymlookup.Browse}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2567)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window$Callback android.view.Window.getCallback()' on a null object reference
at android.support.v7.app.AppCompatDelegateImplBase.<init>(AppCompatDelegateImplBase.java:120)
at android.support.v7.app.AppCompatDelegateImplV9.<init>(AppCompatDelegateImplV9.java:151)
at android.support.v7.app.AppCompatDelegateImplV11.<init>(AppCompatDelegateImplV11.java:31)
at android.support.v7.app.AppCompatDelegateImplV14.<init>(AppCompatDelegateImplV14.java:55)
at android.support.v7.app.AppCompatDelegateImplV23.<init>(AppCompatDelegateImplV23.java:33)
at android.support.v7.app.AppCompatDelegateImplN.<init>(AppCompatDelegateImplN.java:33)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:201)
at android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:185)
at android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:525)
at android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:193)
at com.nesassociates.laurenanderson.acronymlookup.Browse.<init>(Browse.java:18)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1078)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2557)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
