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报错： 05-03 23:23:39.106: E/AndroidRuntime(992): FATAL EXCEPTION: main 05-03 23:23:39.106: E/AndroidRuntime(992): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 05-03 23:23:39.106: E/AndroidRuntime(992): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 05-03 23:23:39.106: E/AndroidRuntime(992): at java.util.ArrayList.get(ArrayList.java:311) 05-03 23:23:39.106: E/AndroidRuntime(992): at com.example.snote1.MainActivity$MyAdapter$6.onClick(MainActivity.java:236) 05-03 23:23:39.106: E/AndroidRuntime(992): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:159) 05-03 23:23:39.106: E/AndroidRuntime(992): at android.os.Handler.dispatchMessage(Handler.java:99) 05-03 23:23:39.106: E/AndroidRuntime(992): at android.os.Looper.loop(Looper.java:123) 05-03 23:23:39.106: E/AndroidRuntime(992): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-03 23:23:39.106: E/AndroidRuntime(992): at java.lang.reflect.Method.invokeNative(Native Method) 05-03 23:23:39.106: E/AndroidRuntime(992): at java.lang.reflect.Method.invoke(Method.java:507) 05-03 23:23:39.106: E/AndroidRuntime(992): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 05-03 23:23:39.106: E/AndroidRuntime(992): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-03 23:23:39.106: E/AndroidRuntime(992): at dalvik.system.NativeStart.main(Native Method) 出现数组越界，但是一直找不到哪里越界了。使用了ArrayList，把数据放在ArrayList中，然后通过MyAdapter放在页面中，在删除的过程中，String deleteItemId=(String)mData.get(Position).get(“id”);notesDao.deleteItem(Integer.parseInt(deleteItemId));，想要通过Position获取到我需要删除的数据的那一行的id值，但是一直获取的过来的Position所在位置的下一行的id值。具体可以看看 代码如下！ package com.example.snote1;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.R.integer;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.example.sqlite3.NotesDao;
public class MainActivity extends ListActivity{
private static final String TAG="example";
private List<Map<String, Object>> mData;
public ImageButton addButton;
public ImageButton searchButton;
private int oldposition=-1;
private Cursor cursor;
NotesDao notesDao;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.activity_main);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.titlebar);
addButton=(ImageButton)findViewById(R.id.addbutton);
searchButton=(ImageButton)findViewById(R.id.searchbutton);
addButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(MainActivity.this,NoteEditActivity.class);
startActivity(intent);
}
});
mData=getData();
setListAdapter(new MyAdapter(MainActivity.this));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
List<Map<String,Object>> getData() {
// TODO Auto-generated method stub
List<Map<String,Object>> list = new ArrayList<Map<String, Object>>();
notesDao=new NotesDao(this);
notesDao.open();
cursor=notesDao.getNotes();
list.clear();
int curnum=cursor.getCount();
if (curnum>0&&cursor!=null) {
cursor.moveToFirst();
for (int i = 0; i < curnum; i++) {
Map<String, Object> map=new HashMap<String, Object>();
map.put("id", cursor.getString(0));
map.put("title", cursor.getString(1));
map.put("content", cursor.getString(2));
map.put("time", cursor.getString(3));
map.put("bmi", cursor.getString(4));
list.add(map);
cursor.moveToNext();
}
}
cursor.close();
notesDao.close();
return list;
}
public final class ViewHolder {
public TextView title;
public TextView content;
public TextView time;
public ImageButton moreButton;
public LinearLayout myLayout;
public Button openButton;
public Button editButton;
public Button deleteButton;
public Button renameButton;
}
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public MyAdapter(Context context) {
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mData.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return mData.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.vlist, null);
Log.d(TAG, "positon " + position + "converView is null,new "+ convertView);
holder.title = (TextView) convertView.findViewById(R.id.title);
holder.content = (TextView) convertView.findViewById(R.id.content);
holder.time = (TextView) convertView.findViewById(R.id.time);
holder.moreButton = (ImageButton) convertView.findViewById(R.id.moreButton);
holder.myLayout = (LinearLayout) convertView.findViewById(R.id.mylayout);
holder.openButton=(Button)convertView.findViewById(R.id.openbtn);
holder.deleteButton=(Button)convertView.findViewById(R.id.deletebtn);
holder.editButton=(Button)convertView.findViewById(R.id.editbtn);
holder.renameButton=(Button)convertView.findViewById(R.id.renamebtn);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
Log.d(TAG, "positon:" + position + "converView is not null,"
+ convertView);
}
holder.title.setText((String) mData.get(position).get("id"));
holder.content.setText((String) mData.get(position).get("title"));
holder.time.setText((String) mData.get(position).get("time"));
holder.moreButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
MyAdapter.this.getMoreMenu(position);
Log.d(TAG, "moreBtn clicked() " + position + " is clicked");
}
});
if (position==oldposition) {
holder.myLayout.setVisibility(View.VISIBLE);
}else {
holder.myLayout.setVisibility(View.GONE);
}
Log.d(TAG, "position:"+position);
final int currentPosition=position;
holder.openButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(MainActivity.this,NoteLookActivity.class);
//String num=String.valueOf(position);
intent.putExtra("result",currentPosition);
//setResult(Activity.RESULT_OK, resultIntent);
startActivity(intent);
}
});
holder.editButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
holder.renameButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
holder.deleteButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showMoveDialog(currentPosition);
//mData.remove(position);
//notifyDataSetChanged();
}
});
return convertView;
}
private void getMoreMenu(int position) {
// TODO Auto-generated method stub
if (position!=oldposition) {
oldposition=position;
}else {
oldposition=-1;
}
notifyDataSetChanged();
}
private void showMoveDialog(final int currentPosition){
new AlertDialog.Builder(MainActivity.this).setTitle("提示").setMessage("确定要删除吗？")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
int newposition=currentPosition-1;
mData.remove(currentPosition);
//cursor.moveToPosition(currentPosition);
Log.d(TAG, "currentPosition "+currentPosition);
Log.d(TAG, "listsize "+getData().size());
Log.d(TAG, "deleteItem "+(String)mData.get(currentPosition).get("id"));
String deleteItemId=(String)mData.get(currentPosition).get("id");
notesDao.open();
notesDao.deleteItem(Integer.parseInt(deleteItemId));
notifyDataSetChanged();
}
}).show();
}
}
}
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| 40分 |
at com.example.snote1.MainActivity$MyAdapter$6.onClick(MainActivity.java:236)
String deleteItemId=(String)mData.get(currentPosition).get(“id”); 236行对应的就是你这一行,mData中没有数据,size为0, |
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你吧mdata强转成字符串了。。。。。当然没有index0的。。。。。你应该加个括号吧
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已经解决。
原来的错误代码。 mData.remove(currentPosition);
//cursor.moveToPosition(currentPosition);
Log.d(TAG, "currentPosition "+currentPosition);
Log.d(TAG, "listsize "+getData().size());
Log.d(TAG, "deleteItem "+(String)mData.get(currentPosition).get("id"));
String deleteItemId=(String)mData.get(currentPosition).get("id");
notesDao.open();
notesDao.deleteItem(Integer.parseInt(deleteItemId));
在mData.remove(currentPosition)，把那一行已经remove了。所在下面获取id时出现数组越界。应该先对数据库操作，获取当前位置的position，删除对应的id，然后再对arraylist操作，进行remove。 正确代码 把这句代码mData.remove(currentPosition);放到数据操作之后。
//cursor.moveToPosition(currentPosition);
Log.d(TAG, "currentPosition "+currentPosition);
Log.d(TAG, "listsize "+getData().size());
Log.d(TAG, "deleteItem "+(String)mData.get(currentPosition).get("id"));
String deleteItemId=(String)mData.get(currentPosition).get("id");
notesDao.open();
notesDao.deleteItem(Integer.parseInt(deleteItemId));
mData.remove(currentPosition);
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