Error Unable to start activity ComponentInfo

Question

I have this error message :

com.example.faizirrahmadi.eyeglauapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.faizirrahmadi.eyeglauapp, PID: 22114
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.faizirrahmadi.eyeglauapp/com.example.faizirrahmadi.eyeglauapp.PenyakitActivity}: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
    at android.app.ActivityThread.access$900(ActivityThread.java:177)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5910)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
Caused by: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
    at java.util.ArrayList.get(ArrayList.java:308)
    at com.example.faizirrahmadi.eyeglauapp.PenyakitActivity.prepareListData(PenyakitActivity.java:111)
    at com.example.faizirrahmadi.eyeglauapp.PenyakitActivity.onCreate(PenyakitActivity.java:69)
    at android.app.Activity.performCreate(Activity.java:6178)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) 
    at android.app.ActivityThread.access$900(ActivityThread.java:177) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:135) 
    at android.app.ActivityThread.main(ActivityThread.java:5910) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:372) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) 

And here is my code (java class)

package com.example.faizirrahmadi.eyeglauapp;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;

import sistempakar.dbHelper;

 /**
 * Created by Faizir Rahmadi on 3/19/2016.
 */
 public class PenyakitActivity extends ActionBarActivity {
 ExpandableListAdapter listAdapter;
 ExpandableListView expListView;
 List<String> listDataHeader;
 HashMap<String, List<String>> listDataChild;

 Cursor cursor_gejala;
 dbHelper myDb;
 SQLiteDatabase sqliteDatabase;
 TextView nama_penyakit;


 public String bundleId;
 public String bundleKode;
 private String bundleNamaPenyakit;
 private String bundleDeskripsi;
 private String bundleGejala;
 private String bundlePenanganan;
 String a;

List<String> bundleNamaGejala;
List<String> namaGejalaList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_penyakit);

    Bundle takeData = getIntent().getExtras();
    bundleId = takeData.getString("clickedId");
    bundleKode = takeData.getString("clickedKode").toLowerCase();
    bundleNamaPenyakit = takeData.getString("clickedNamaPenyakit");
    bundleDeskripsi = takeData.getString("clickedDeskripsi");
    bundleGejala = takeData.getString("clickedGejala");
    bundlePenanganan = takeData.getString("clickedPenanganan");

    //mengubah kode gejala menjadi nama gejala yang ditampilkan
    bundleNamaGejala = Arrays.asList(bundleGejala.split("\\s*,\\s*"));

    nama_penyakit = (TextView) findViewById(R.id.textView5);
    nama_penyakit.setText(bundleNamaPenyakit);
    nama_penyakit.setAllCaps(true);


    expListView = (ExpandableListView) findViewById(R.id.expandableListView);
    namagejala(bundleNamaGejala);
    a = new String(TextUtils.join(", ", namaGejalaList));
    prepareListData();
    listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);
    expListView.setAdapter(listAdapter);
    Toast.makeText(this, a, Toast.LENGTH_SHORT).show();
}

//mengubah kode gejala dalam tabel RELASI menjadi nama gejala dari tabel GEJALA
public List<String> namagejala(List<String> _nama) {
    myDb = new dbHelper(this);
    sqliteDatabase = myDb.getReadableDatabase();
    String where = "";
    namaGejalaList = new ArrayList<String>();
    for (int i = 0; i < _nama.size(); i++) {
        where = where + dbHelper.COLUMN_ID_GEJALA + " IN('" + _nama.get(i).toString() + "')";
        if (i != (_nama.size() - 1)) {
            where = where + " OR ";
        }
    }
    cursor_gejala = sqliteDatabase.query(dbHelper.TABLE_GEJALA, new String[]{dbHelper.COLUMN_NM_GEJALA}, where, null, null, null, null);
    while (cursor_gejala.moveToNext()) {
        namaGejalaList.add(cursor_gejala.getString(cursor_gejala.getColumnIndex(dbHelper.COLUMN_NM_GEJALA)));
    }
    return namaGejalaList;
}

private void prepareListData() {
    listDataHeader = new ArrayList<String>();
    listDataChild = new HashMap<String, List<String>>();

    listDataHeader.add("Gejala");


    List<String> deskripsi = new ArrayList<String>();
    deskripsi.add(bundleDeskripsi);

    List<String> gejala = new ArrayList<String>();
    gejala.add(a);

    List<String> penanganan = new ArrayList<String>();
    penanganan.add(bundlePenanganan);

    listDataChild.put(listDataHeader.get(0), deskripsi);
    listDataChild.put(listDataHeader.get(1), gejala);
    listDataChild.put(listDataHeader.get(2), penanganan);
}

}

I don't know how this could happend.. i have check and always there's error on prepareListData(); and listDataChild.put(listDataHeader.get(1), gejala); I've been searching all the answer and nothing could help me Thank you for your kindess for helping me and solve this problem for the future

Answer 1

List index starts from 0, so if you want get first element, you should write

listDataHeader.get(0)

If the size of listDataHeader is 1, you will have an exception when you try to get element with index 1.

Answer 2

In your code you put one item in your

listDataHeader.add("Gejala");

in prepareListData() method. Which is on 0 index. And you are trying to access

listDataChild.put(listDataHeader.get(1), gejala);

index 1 of listDataHeader list which is not available. So, you get the error.