【发布时间】：2013-09-28 06:21:36
【问题描述】：
检查 rdio4 时出现 Nullpointerexception 错误 代码：
Answerpage.java
package com.example.psikotestproject;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.os.Message;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class AnswerPage extends Activity{
@Override
protected void onDestroy() {
super.onDestroy();
}
DbHelper dbhelper;
SQLiteDatabase db;
Context contextim;
int i=1;
int obko=0;
int soma=0;
int kadu=0;
int depr=0;
int foan=0;
static float somahesap=0.0f;
static float obkohesap=0.0f;
static float kaduhesap=0.0f;
static float deprhesap=0.0f;
static float foanhesap=0.0f;
//dizim
final String questions[]={
"Baş ağrısı" ,
"Sinirlilik ya da içinin titremesi",
"Zihinden atamadığınız tekrarlayan, hoşa gitmeyen düşünceler",
"Baygınlık ya da baş dönmesi",
"Cinsel arzu ve ilginin kaybı",
"Başkaları tarafından eleştirilme duygusu",
"Herhangi bir kimsenin düşüncelerinizi kontrol edebileceği
};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.answerpage);
//component tanımları
final TextView txtquestion=(TextView)findViewById(R.id.txtquestion);
final RadioGroup rdiogroup=(RadioGroup)findViewById(R.id.rdiogroup);
final RadioButton rdio0=(RadioButton)findViewById(R.id.rdio0);
final RadioButton rdio1=(RadioButton)findViewById(R.id.rdio1);
final RadioButton rdio2=(RadioButton)findViewById(R.id.rdio2);
final RadioButton rdio3=(RadioButton)findViewById(R.id.rdio3);
final RadioButton rdio4=(RadioButton)findViewById(R.id.rdio4);
final Button btndigersoru=(Button)findViewById(R.id.btndigersoru);
final Button btnoncekisoru=(Button)findViewById(R.id.btnoncekisoru);
txtquestion.setText(questions[i-1]);
//diğersorubutonclick
btndigersoru.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
if(rdio0.isChecked()||rdio1.isChecked()||rdio2.isChecked()||rdio3.isChecked()||rdio4.isChecked())
{
txtquestion.setText(questions[i]);
if(rdio0.isChecked()==true)
{
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio1.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma++;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko++;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu++;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr++;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan++;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio2.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma=soma+2;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko=obko+2;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu=kadu+2;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr=depr+2;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan=foan+2;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio3.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma=soma+3;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko=obko+2;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu=kadu+2;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr=depr+2;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan=foan+3;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
if(rdio4.isChecked()==true)
{
if(i==1||i==4||i==12||i==27||i==40||i==42||i==48||i==52||i==53||i==56||i==58)
soma=soma+4;
if(i==3||i==9||i==10||i==28||i==38||i==45||i==46||i==51||i==55||i==65)
obko=obko+4;
if(i==6||i==21||i==34||i==36||i==37||i==41||i==61||i==69||i==73)
kadu=kadu+4;
if(i==4||i==5||i==15||i==20||i==22||i==26||i==29||i==30||i==31||i==32||i==54||i==71||i==79)
depr=depr+4;
if(i==13||i==25||i==47||i==50||i==70||i==75||i==82)
foan=foan+4;
dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId());
//secili[i]=rdiogroup.getCheckedRadioButtonId();
rdiogroup.clearCheck();
}
}
if(i<16)
i++;
else{}
if(i>1)
{
btnoncekisoru.setVisibility(View.VISIBLE);
}
if(i>=9)
//if(i>=90)
{
//En son hesaplar
somahesap=(float) (soma/11.0);
obkohesap=(float) (obko/10.0);
kaduhesap=(float) (kadu/9.0);
deprhesap=(float) (depr/13.0);
foanhesap=(float) (foan/7.0);
Intent finishingActivity=new Intent("com.example.psikotestproject.RESULTPAGE");
startActivity(finishingActivity);
}
}
});
//btnoncekibutonclick
btnoncekisoru.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
rdiogroup.clearCheck();
dbhelper.getKayitlar(i-1);
txtquestion.setText(questions[i-1]);
i--;
//rdiogroup.check(secili[i]);
if(i<=0)
{
btnoncekisoru.setVisibility(View.INVISIBLE);
}
}
});
}
Dbhelper.java
public class DbHelper extends SQLiteOpenHelper {
// Tüm Static değişkenler
// Database Versiyonu
private static final int DATABASE_VERSION = 1;
// Database Adı
private static final String DATABASE_NAME = "dbSecimler";
// Kayitlar Tablosunun Adı
private static final String TABLE_NAME = "Secimler";
// Kayitlar Tablosunun Kolon Adları
private static final String KEY_CEVAP = "Cevaplar";
// Yapılandırıcı metod
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Database Oluşturma işlemi.
@Override
public void onCreate(SQLiteDatabase db) {
String create_table = "CREATE TABLE " + TABLE_NAME + "(id INTEGER PRİMARY KEY AUTOINCREMENT"
+ KEY_CEVAP + " INTEGER," + ")";
db.execSQL(create_table);
}
// Database Yükseltme işlemi.
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Varsa şayet eski tabloyu sil.
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
// Tekrar tablo oluştur.
onCreate(db);
}
// Yeni Kayıt Eklemek.
void addKayitlar(int i) {
SQLiteDatabase db= this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_CEVAP, i);
// Ekleme işlemi...
db.insert(TABLE_NAME, null , values);
db.close(); // Açık olan database i kapat.
}
//İstenilen Kaydı Getirmek.
Kayitlar getKayitlar(int i) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_NAME, new String[] {KEY_CEVAP},null, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Kayitlar kayit = new Kayitlar(Integer.parseInt(cursor.getString(1)));
// return Kayitlar
return kayit;
}
}
LogCat 上的错误
threadid=1: thread exiting with uncaught exception (group=0x4001d800)
FATAL EXCEPTION: main
java.lang.NullPointerExceptionat com.example.psikotestproject.AnswerPage$1.onClick(AnswerPage.java:282)
-
-
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和 282 是：dbhelper.addKayitlar(rdiogroup.getCheckedRadioButtonId()); rdiogroup.getCheckedRadioButtonId() not null 我确定。我想我在保存数据库时出错了。我能解决什么？
【问题讨论】：
-
几乎不可能从这段代码中分辨出什么对象是 null 或者它是如何得到的，但是 rdioGroup 是我要检查它是否是我的代码的第一个对象。
-
我们需要您的 Activity/Fragment 的代码来帮助您。在这里我们不知道你是否正确获得了 rdiogroup。
-
好的，我已经复制了我的活动的完整代码。当我记录一个int数组时没有任何错误。当我开始使用数据库时它抛出错误。
标签： android nullpointerexception