嗨，大家好我有一个小问题我编写了sql数据库代码和我的活动代码......现在，当我尝试启动活动时应用程序崩溃（1）。我也给你sql数据库代码（2）。和来自logcat（3）的文本。
（1）：
package com.peky.smartornot;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.Toast;
import android.widget.TabHost.TabSpec;
import android.widget.TextView;
public class POV1 extends Activity {
Sql ulaz = new Sql(this);
TextView joke4text;
TextView joke3text;
TextView joke2text;
TextView joke1text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pov1);
sve();
}
public void sve() {
// TODO Auto-generated method stub
ulaz.open();
int joker1 = ulaz.procitaj(), joker2 = ulaz.procitaj2(), joker3 = ulaz
.procitaj3(), joker4 = ulaz.procitaj4();
ulaz.close();
TabHost joker = (TabHost) findViewById(R.id.tabhost);
joker.setup();
TabSpec izgled = joker.newTabSpec("tag1");
izgled.setContent(R.id.tab1);
izgled.setIndicator("Joker 1");
joker.addTab(izgled);
izgled = joker.newTabSpec("tag2");
izgled.setContent(R.id.tab2);
izgled.setIndicator("Joker 2");
joker.addTab(izgled);
izgled = joker.newTabSpec("tag3");
izgled.setContent(R.id.tab3);
izgled.setIndicator("Joker 3");
joker.addTab(izgled);
izgled = joker.newTabSpec("tag4");
izgled.setContent(R.id.tab4);
izgled.setIndicator("Joker 4");
joker.addTab(izgled);
joke1text = (TextView) findViewById(R.id.joker1text);
joke1text.setText("You have " + joker1 + " jokers !");
joke2text = (TextView) findViewById(R.id.joker2text);
joke2text.setText("You have " + joker2 + " jokers !");
joke3text = (TextView) findViewById(R.id.joker3text);
joke3text.setText("You have " + joker3 + " jokers !");
joke4text = (TextView) findViewById(R.id.joker4text);
joke4text.setText("You have " + joker4 + " jokers !");
}
public void joker1(View view) {
Button netocan = (Button) findViewById(R.id.button5);
Button netocan2 = (Button) findViewById(R.id.button4);
Button netocan3 = (Button) findViewById(R.id.button2);
ulaz.open();
int joker1=ulaz.procitaj(),joker2,joker3,joker4;
ulaz.close();
if (joker1 != 0) {
if(netocan.getVisibility()==View.VISIBLE){
netocan.setVisibility(View.INVISIBLE);
ulaz.open();
joker1=joker1-1;
joker2=ulaz.procitaj2();
joker3=ulaz.procitaj3();
joker4=ulaz.procitaj4();
ulaz.spremijoker(joker1, joker2, joker3, joker4);
ulaz.close();
joke1text = (TextView) findViewById(R.id.joker1text);
joke1text.setText("You have " + joker1 + " jokers !");
}else if(netocan2.getVisibility()==View.VISIBLE){
netocan2.setVisibility(View.INVISIBLE);
ulaz.open();
joker1=joker1-1;
joker2=ulaz.procitaj2();
joker3=ulaz.procitaj3();
joker4=ulaz.procitaj4();
ulaz.spremijoker(joker1, joker2, joker3, joker4);
ulaz.close();
joke1text = (TextView) findViewById(R.id.joker1text);
joke1text.setText("You have " + joker1 + " jokers !");
}else if(netocan3.getVisibility()==View.VISIBLE){
netocan3.setVisibility(View.INVISIBLE);
ulaz.open();
joker1=joker1-1;
joker2=ulaz.procitaj2();
joker3=ulaz.procitaj3();
joker4=ulaz.procitaj4();
ulaz.spremijoker(joker1, joker2, joker3, joker4);
ulaz.close();
joke1text = (TextView) findViewById(R.id.joker1text);
joke1text.setText("You have " + joker1 + " jokers !");
}else{
Toast imasodgovor=Toast.makeText(getApplicationContext(), "You can not use more JOKERS1 on this question !", Toast.LENGTH_SHORT);
imasodgovor.show();
}
}else{
Toast nemasjokera=Toast.makeText(getApplicationContext(), "You dont have enought JOKERS1 !", Toast.LENGTH_SHORT);
nemasjokera.show();
}
}
public void joker4(View view) {
ulaz.open();
int joker1,joker2,joker3,joker4=ulaz.procitaj4();
ulaz.close();
Button netocan = (Button) findViewById(R.id.button5);
Button netocan2 = (Button) findViewById(R.id.button4);
Button netocan3 = (Button) findViewById(R.id.button2);
if (joker4 != 0) {
if(netocan.getVisibility()==View.VISIBLE || netocan2.getVisibility()==View.VISIBLE || netocan3.getVisibility()==View.VISIBLE){
netocan.setVisibility(View.INVISIBLE);
netocan2.setVisibility(View.INVISIBLE);
netocan3.setVisibility(View.INVISIBLE);
ulaz.open();
joker1=ulaz.procitaj();
joker2=ulaz.procitaj2();
joker3=ulaz.procitaj3();
joker4=joker4 - 1;;
ulaz.spremijoker(joker1, joker2, joker3, joker4);
ulaz.close();
joke4text = (TextView) findViewById(R.id.joker4text);
joke4text.setText("You have " + joker4 + " jokers !");}else{
Toast imasodgovor=Toast.makeText(getApplicationContext(), "You can not use more JOKERS4 on this question !", Toast.LENGTH_SHORT);
imasodgovor.show();
}
} else {
Toast jokertext = Toast.makeText(getApplicationContext(),
"Not enought JOKERS4", Toast.LENGTH_SHORT);
jokertext.show();
}
}
public void joker2(View view){
}
public void tocan(View view){
}
public void netocanodgovor(View view) {
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.pov1, menu);
return false;
}
}
（2）：
package com.peky.smartornot;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Sql {
public static final String KEY_ROWID = "_id";
public static final String KEY_JOKER1 = "joker";
public static final String KEY_JOKER2 = "joker2";
public static final String KEY_JOKER3 = "joker3";
public static final String KEY_JOKER4 = "joker4";
private static final String DATABASE_NAME = "SQL";
private static final String DATABASE_TABLE = "peoples_table";
private static final int DATABASE_VERSION = 1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper {
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
+ " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_JOKER1
+ " INTEGER, " + KEY_JOKER2 + " INTEGER, " + KEY_JOKER3
+ " INTEGER, " + KEY_JOKER4 + " INTEGER);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public Sql(Context c) {
ourContext = c;
}
public Sql open() {
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close() {
ourHelper.close();
}
public long spremijoker(int joker1, int joker2, int joker3, int joker4) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_JOKER1, joker1);
cv.put(KEY_JOKER2, joker2);
cv.put(KEY_JOKER3, joker3);
cv.put(KEY_JOKER4, joker4);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public int procitaj() {
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_JOKER1 };
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
null, null);
int citac = 0;
int iJokerammount = c.getColumnIndex(KEY_JOKER1);
c.moveToLast();
citac = c.getInt(iJokerammount);
return citac;
}
public int procitaj2() {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_JOKER2 };
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
null, null);
int citac = 0;
int iJoker2 = c.getColumnIndex(KEY_JOKER2);
c.moveToLast();
citac = c.getInt(iJoker2);
return citac;
}
public int procitaj3() {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_JOKER3 };
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
null, null);
int citac = 0;
int iJoker3 = c.getColumnIndex(KEY_JOKER3);
c.moveToLast();
citac = c.getInt(iJoker3);
return citac;
}
public int procitaj4() {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
String[] columns = new String[] { KEY_ROWID, KEY_JOKER4 };
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
null, null);
int citac = 0;
int iJoker4 = c.getColumnIndex(KEY_JOKER4);
c.moveToLast();
citac = c.getInt(iJoker4);
return citac;
}
}
（3）：
03-16 19:32:11.580: E/AndroidRuntime(26569): FATAL EXCEPTION: main
03-16 19:32:11.580: E/AndroidRuntime(26569): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.peky.smartornot/com.peky.smartornot.POV1}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 0
03-16 19:32:11.580: E/AndroidRuntime(26569): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
答案 0 :(得分：1)
你的错误说明了一切：
CursorIndexOutOfBoundsException：请求索引-1，大小为0
您正在尝试访问元素索引为-1的某事的空列表。 -1永远不是Java中的有效数组索引，因此您有两个问题：
-1的错误索引值的原因是什么？由于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)是造成问题的地方，因此您需要查看。你的代码中有什么叫它？由于performLaunchActivity在您发布的代码中没有任何地方（您的main功能也没有），并且由于您的堆栈跟踪不是更彻底，我们需要更多信息才能进一步帮助您。< / p>
答案 1 :(得分：0)
我找到了修复我在procitaj方法中设置的问题：
for(c.moveToFirst;!c.isAfterLast;c.moveToNext){
citac = c.getInt(iJoker4);
}
代替：
c.moveToLast;
非常感谢！