I tried to add data to sqlite, but when I clicked Add Button error appear and my app closed. I don't understand, so many wasted hours for looking the solution by myself..
here is my java code, AddSampleActivity.java
package com.example.mangan;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class AddSampleActivity extends AppCompatActivity {
DatabaseHelper myDb;
EditText editNama, editJarak, editRating , editHarga;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_sample);
editNama = (EditText) findViewById(R.id.nama);
editJarak = (EditText) findViewById(R.id.jarak);
editRating = (EditText) findViewById(R.id.rating);
editHarga = (EditText) findViewById(R.id.harga);
myDb = new DatabaseHelper(this);
}
public void addData(View view) {
boolean isInserted = myDb.insertData(editNama.getText().toString(),
editJarak.getText().toString(),
editRating.getText().toString(),
editHarga.getText().toString() );
if(isInserted)
Toast.makeText(AddSampleActivity.this,"Data Inserted",Toast.LENGTH_LONG).show();
else
Toast.makeText(AddSampleActivity.this,"Data not Inserted",Toast.LENGTH_LONG).show();
}
}
my layout, activity_add_sample.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp"
tools:context="com.example.mangan.AddSampleActivity">
<EditText
android:id="@+id/jarak_editText"
android:hint="Jarak"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<EditText
android:id="@+id/rating_editText"
android:hint="Rating"
android:layout_marginTop="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<EditText
android:id="@+id/harga_editText"
android:hint="Harga"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/add_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="addData"
android:text="Add"/>
</LinearLayout>
This is fullstack trace
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22651)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:208)
at android.app.ActivityThread.main(ActivityThread.java:6267)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22651)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:208)
at android.app.ActivityThread.main(ActivityThread.java:6267)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
at com.example.mangan.AddSampleActivity.addData(AddSampleActivity.java:30)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5675)
at android.view.View$PerformClick.run(View.java:22651)
at android.os.Handler.handleCallback(Handler.java:836)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:208)
at android.app.ActivityThread.main(ActivityThread.java:6267)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1063)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:924)
It seem that some content on addData method is the problem. I read another question, Getting IllegalStateException on button click, but the problem is little bit different..
