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我正在开发应用程序，我想在其中解析 xml 文件并将其存储在 db 中并从表中检索特定记录并将其显示在列表视图中，当我单击它时，通过意图将该值传递给下一个活动。我试过了。当我将安装该应用程序的.apk 时，它工作正常，但是当我回到列表视图活动并单击任何值时，它会给出错误“forse close”并且应用程序被终止。在 log cat 中，它给出了如下所示的错误。

它每次都从数据库中获取记录并完美地显示在列表视图中。我收到错误 onclick 事件，当我再次返回列表视图时也是如此。

请帮我解决问题...提前谢谢您...！

Logcat 错误

> *03-22 22:07:51.681: E/AndroidRuntime(336): FATAL EXCEPTION: main
03-22 22:07:51.681: E/AndroidRuntime(336): java.lang.IndexOutOfBoundsException:     Invalid index 1, size is 0
03-22 22:07:51.681: E/AndroidRuntime(336):  at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
03-22 22:07:51.681: E/AndroidRuntime(336):  at java.util.ArrayList.get(ArrayList.java:311)
03-22 22:07:51.681: E/AndroidRuntime(336):  at com.dod.test.List_of_Consumer$1.onItemClick(List_of_Consumer.java:130)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.widget.AdapterView.performItemClick(AdapterView.java:284)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.widget.ListView.performItemClick(ListView.java:3513)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.widget.AbsListView$PerformClick.run(AbsListView.java:1812)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.os.Handler.handleCallback(Handler.java:587)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.os.Looper.loop(Looper.java:123)
03-22 22:07:51.681: E/AndroidRuntime(336):  at android.app.ActivityThread.main(ActivityThread.java:3683)
03-22 22:07:51.681: E/AndroidRuntime(336):  at java.lang.reflect.Method.invokeNative(Native Method)
03-22 22:07:51.681: E/AndroidRuntime(336):  at java.lang.reflect.Method.invoke(Method.java:507)
03-22 22:07:51.681: E/AndroidRuntime(336):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-22 22:07:51.681: E/AndroidRuntime(336):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-22 22:07:51.681: E/AndroidRuntime(336):  at dalvik.system.NativeStart.main(Native Method)*

List_of_Consumer //我从 db 检索 reords 并显示在 listview 中的第一个活动。

package com.dod.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class List_of_Consumer extends Activity {
Button back;
Intent i;
TextView txt_xml;
String consumer_id,meter,or,current,s;
ListView lv;
ArrayList<String> cid;
ArrayList<String> a;
InputStream is;
DB_Adapter database;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_list_of_consumer);
    back = (Button)findViewById(R.id.btnback);
    lv=(ListView)findViewById(R.id.lv);
    database = new DB_Adapter(getApplicationContext(), "EBS", null, 1);

    try
    {

        a = new ArrayList<String>();
        if(database.count())
        {
            getxmldata();
        }else
        {
            File xml = new File(Environment.getExternalStorageDirectory(),  "t21.xml");
            is = new FileInputStream(xml);
            //is = new FileInputStream("/data/data/com.dod.test/t21.xml");
            InputStreamReader isr= new InputStreamReader(is);



                XmlPullParserFactory xf=XmlPullParserFactory.newInstance();
                XmlPullParser xp=xf.newPullParser();
                xp.setInput(isr);
                int event=xp.getEventType();

                while(event!=XmlPullParser.END_DOCUMENT)
                {
                    if(event==XmlPullParser.START_TAG)
                    {
                        current=xp.getName();
                    }
                    else if(event==XmlPullParser.TEXT)
                    {
                        if(current.equals("consumerid"))
                        {

                            a.add(xp.getText());    

                            consumer_id=xp.getText();
                            Toast.makeText(getApplicationContext(), consumer_id, Toast.LENGTH_SHORT).show();

                        }
                        else if(current.equals("meter"))
                        {
                            meter=xp.getText();
                            Toast.makeText(getApplicationContext(), meter, Toast.LENGTH_SHORT).show();
                        }
                        else if(current.equals("or"))
                        {
                            or=xp.getText();
                            database.addConsumer(consumer_id, meter,or);
                            database.close();
                        }

                    }               

                    event=xp.next();

                    }
                    getxmldata();
        }





            lv.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1,
                        int arg2, long arg3) {
                    String st=a.get(arg2);
                    Toast.makeText(getApplicationContext(), "Consumer:="+st, Toast.LENGTH_SHORT).show();

                    Intent i = new Intent(getApplicationContext(),Reading_Detail.class);
                    i.putExtra("key", st);
                    startActivity(i);
                    // TODO Auto-generated method stub

                }
            });

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }



    /*back.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            i = new Intent(getApplicationContext(),Home.class);
            startActivity(i);
            finish();
        }
    });*/

}

public void getxmldata()
{
    cid=database.get_consumer_id();
    ArrayAdapter<String> aa = new ArrayAdapter<String>(getApplicationContext(), R.layout.row,R.id.txt,cid);
    lv.setAdapter(aa);
}

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

}

DB_Adapter //数据库文件

package com.dod.test;

import java.util.ArrayList;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DB_Adapter extends SQLiteOpenHelper {
public SQLiteDatabase db;
String s2,s3;
public static final String KEY_NAME = "USERNAME";
public static final String KEY_PASSWORD = "PASSWORD";
public static final String DATABASE_TABLE = "LOGIN";
public static final String DATABASE_TABLE1 = "CONSUMER";
public static final String DATABASE_TABLE2 = "CONSUMER_XML";
public DB_Adapter(Context context, String name, CursorFactory factory,
        int version) {
    super(context, name, factory, version);
    // TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase arg0) {
    // TODO Auto-generated method stub
    arg0.execSQL("CREATE TABLE LOGIN(ID INTEGER PRIMARY KEY AUTOINCREMENT," +
            "USERNAME TEXT NOT NULL," +
            "PASSWORD TEXT NOT NULL)");
    arg0.execSQL("CREATE TABLE CONSUMER(ID INTEGER PRIMARY KEY AUTOINCREMENT," + 
            "CONSUMER_ID INTEGER NOT NULL," +
            "METER_NO INTEGER NOT NULL," +
            "PREV_READING INTEGER NOT NULL," +
            "CURR_READING INTEGER NOT NULL," +
            "IMAGE TEXT NOT NULL," +
            "STATUS INTEGER NOT NULL)");
    arg0.execSQL("CREATE TABLE CONSUMER_XML(CONSUMER_ID INTEGER PRIMARY KEY NOT NULL," +
            "METER_NO INTEGER NOT NULL," +
            "PREV_READING INTEGER NOT NULL)");
}

@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
    // TODO Auto-generated method stub
    arg0.execSQL("DROP TABLE IF EXIST LOGIN");
    arg0.execSQL("DROP TABLE IF EXIST CONSUMER");
    arg0.execSQL("DROP TABLE IF EXIST CONSUMER_XML");
    onCreate(arg0);
}

public void addConsumer(String consumerid,String meter,String pr)
{
    db=getWritableDatabase();
    ContentValues cv=new ContentValues();
    cv.put("CONSUMER_ID", consumerid);
    cv.put("METER_NO", meter);
    cv.put("PREV_READING", pr);
    db.insert(DATABASE_TABLE2, null, cv);
}
public boolean count()
{
    Cursor c = getReadableDatabase().rawQuery("SELECT CONSUMER_ID FROM " + DATABASE_TABLE2,null);
    if (c.getCount()>0)
          return true;
          return false;
}


public ArrayList<String> get_consumer_id()
{
    ArrayList<String>names1=new ArrayList<String>();
    Cursor c = getReadableDatabase().rawQuery("Select CONSUMER_ID from " + DATABASE_TABLE2, null);
    c.moveToFirst();
    do
    {
        String s1=c.getString(c.getColumnIndex("CONSUMER_ID"));
        names1.add(s1);
    }while(c.moveToNext());
    return names1;
}

}

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1 回答 1

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您的 logcat 清楚地表明您正在由此获得 Index out of bounds 异常。

java.lang.IndexOutOfBoundsException:     Invalid index 1, size is 0
at com.dod.test.List_of_Consumer$1.onItemClick(List_of_Consumer.java:130)

你的代码中的第 130 行是什么？如果您可以使用更具体的代码部分来编辑您的问题，那么就有可能根据该代码编辑我的答案。

于 2013-03-22T17:51:49.673 回答