Java sqlite行ID与listview不匹配-ANDROID

这可能是一个蹩脚的问题，但我是一个初学者，似乎不了解我的应用程序的行为

我有一个SQLite数据库，在主活动中有一个列表视图。 在列表视图中，我显示列表编号（行id）和其他详细信息。 按下列表项后，将打开一个新的活动，该活动在文本视图中显示详细信息，并有两个用于删除和同步的图像按钮

在我删除任何条目之前，该应用程序工作正常

删除任何条目后，listview上的行id似乎不会更新行号。（如果删除第一行，顶部的行显示2（应该是1，因为它是新的第一行））

但是，当我显示记录的详细信息时，结果是正确的。（列表中的第二项显示第2行）

此外，当我在列表视图中按下一个与我先前删除的位置相同的项目时，应用程序崩溃（假设我删除了第一个条目，之后每当我单击列表视图上的第一个项目以显示它时，应用程序崩溃）

应用程序崩溃时出现错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.aakashmaroti.fillup/com.example.aakashmaroti.fillup.DisplayDetails}: android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0

我的主要活动

package com.example.aakashmaroti.fillup;

import android.app.Dialog;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.database.Cursor;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


public class StartScreen extends ActionBarActivity implements View.OnClickListener {


    FavoriteList favList = new FavoriteList();

    TextView rid,ts,sd;
    ListView lv;
    Context context=this;
    Find db=new Find(this);
    List<FavoriteList> favoriteList;
    LinearLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start_screen);
        Button b = (Button) findViewById(R.id.AddButton);
        b.setOnClickListener(this);
        lv = (ListView) findViewById(R.id.listview);
        try
        {
            populateListViewFromDatabase();
        } catch (Exception e)
        {
            Toast.makeText(getApplicationContext(), "Oops there has been an error "+e.toString()+"", Toast.LENGTH_LONG).show();
            e.printStackTrace();
        }

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener()
        {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)
            {
                showsDialog(position);
            }
        });


    }


    @Override
    public void onResume()
    {
        super.onResume();
        try
        {
            populateListViewFromDatabase();
        } catch (Exception e)
        {
            Toast.makeText(getApplicationContext(), "Oops there has been an error "+e.toString()+"", Toast.LENGTH_LONG).show();
            e.printStackTrace();
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_start_screen, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId())
        {
            case R.id.AddButton:
                startActivity(new Intent(this,Form.class));
                break;

            default: break;
        }
    }

    public void populateListViewFromDatabase()throws Exception
    {
        Find info=new Find(this);
        try
        {
            info.open();
            SimpleCursorAdapter myCursorAdapter;
            myCursorAdapter = info.listUp();
            lv.setAdapter(myCursorAdapter);
            info.close();

        } catch (SQLException e)
        {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Oops there has been an error "+e.toString()+"", Toast.LENGTH_LONG).show();
        }
    }
    public void showsDialog(int pos)
    {

        pos++;
        String s = "";
        s += pos;
        Intent i = new Intent(getApplicationContext(), DisplayDetails.class);
        i.putExtra("position", s);
        startActivity(i);

        try
        {
            populateListViewFromDatabase();
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }

}

显示结果的新活动的类

package com.example.aakashmaroti.fillup;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

import java.sql.SQLException;


public class DisplayDetails extends ActionBarActivity implements View.OnClickListener

{

    ImageButton ibSync;
    ImageButton ibDelete;
    TextView DispDetails;
    int pos;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        Bundle extras = getIntent().getExtras();

        String value="1";
        if (extras != null) {
           value = extras.getString("position");
        }
        pos=Integer.parseInt(value);
        setContentView(R.layout.activity_display_details);
        ibSync=(ImageButton)findViewById(R.id.imageButtonSync);
        ibDelete=(ImageButton)findViewById(R.id.imageButtonDelete);
        DispDetails = (TextView)findViewById(R.id.textViewDisplayDetails);
        String s="";

        ibSync.setOnClickListener(this);
        ibDelete.setOnClickListener(this);

        Find info1=new Find(this);
        try
        {
            info1.open();
            s=info1.getDetails(pos);
            info1.close();

        } catch (SQLException e)
        {
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "Oops there has been an error "+e.toString()+"", Toast.LENGTH_LONG).show();
        }
        DispDetails.setText(s);

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_display_details, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings)
        {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View v)
    {
        if(v.getId()==R.id.imageButtonSync)
        {
            Toast.makeText(getApplicationContext(), "This functionality has not yet been added", Toast.LENGTH_LONG).show();
        }
        if(v.getId()==R.id.imageButtonDelete)
        {   Find info1=new Find(this);
            try
            {
                info1.open();
                info1.DeleteRow(pos);
                info1.close();

            } catch (SQLException e)
            {
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "Oops there has been an error "+e.toString()+"", Toast.LENGTH_LONG).show();
            }


            Toast.makeText(getApplicationContext(), "This record has been successfully deleted", Toast.LENGTH_LONG).show();
            cancel();
        }
    }

    public void cancel()
    {
        this.finish();
        return;
    }
}

listview中单行的Xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:text=""
        android:textStyle="bold"
        android:clickable="true"
        android:id="@+id/rowno"/>   

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text=""
        android:clickable="true"
        android:id="@+id/timestamp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:textStyle="bold"
        android:text=""
        android:clickable="true"
        android:id="@+id/syncdetails"/>

</LinearLayout>

任何帮助都将不胜感激

---

提前谢谢

只能在onResume或onCreate中获取光标。因此，尽管数据发生变化，光标仍保持不变。查看LoaderManager类。

因为您要传递列表视图项的位置，所以它应该是数据库行id

改变

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
    showsDialog(position);
}

---

但不会，因为这是数据库行id而不是列表视图位置。

非常感谢！它就像一个符咒！还有没有办法显示项目位置而不是行id？因为删除行id会导致错误。再次感谢！如果您想显示listview项的位置而不是行id，那么我想您必须使用自定义适配器。

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
    showsDialog(position);
}

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
    TextView pos = (TextView) view.findViewById(R.id.rowno);
    showsDialog(pos.getText().toString());
}

Once I delete any entry the row id on the listview doesn't seem to update the row number. (if i delete the first row, the row on top shows 2(should be 1, as it is the new first row)).