问题
I've a custom list view with 4 textViews and 2 buttons,which i am filling up via database,
TV NAME | TV EMAIL | TV NO | TV ID(database primary key,set invisible) | ButtonEDIT | ButtonDelete.
I successfully got the id from the database,which is set as primary key.
Now what i want to do is,when i PRESS ButtonEDIT,it should toast a message something like "Edit selected for ID :" + TVID.getText().toString(),so basically i want to display the value which is stored in the TVID(i.e. my database id).
But when i am trying to do it,it only displays the firstID (0) for buttons of different rows,please do help asap.
Am linking code below
Custom ListView Adapter :
package com.iwill.Database_add_display;
import java.io.ObjectOutputStream.PutField;
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MyAdapter extends BaseAdapter
{
private ArrayList<userdetails> data;
private static LayoutInflater minflater=null;
private int[] userArray;
public MyAdapter(Context context,ArrayList<userdetails> results)
{
data = results;
minflater = LayoutInflater.from(context);
}
@Override
public int getCount()
{
return data.size();
}
@Override
public Object getItem(int position)
{
return data.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
public int getUserArray(int position){
return userArray[position];
}
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if (convertView == null)
{
convertView = minflater.inflate(R.layout.row, null);
holder = new ViewHolder();
holder.tvname = (TextView) convertView.findViewById(R.id.textname);
holder.tvemail = (TextView) convertView.findViewById(R.id.textemail);
holder.tvno = (TextView) convertView.findViewById(R.id.textno);
holder.tvID = (TextView)convertView.findViewById(R.id.textID);
holder.b1 = (Button) convertView.findViewById(R.id.btnEdit);
holder.b2 = (Button) convertView.findViewById(R.id.btnDelete);
//convertView.setTag(holder);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.tvname.setText(data.get(position).getName());
holder.tvemail.setText(data.get(position).getMail());
holder.tvno.setText(data.get(position).getNo());
holder.tvID.setText(String.valueOf(data.get(position).getID()));
return convertView;
}
static class ViewHolder
{
TextView tvname;
TextView tvemail;
TextView tvno;
Button b1;
Button b2;
TextView tvID;
}
}
ListActivity :
package com.iwill.Database_add_display;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class viewnameactivity extends Activity
{
ArrayList<userdetails> mylist = new ArrayList<userdetails>();
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
ListView listView;
MyAdapter adapter;
int pos;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.viewname);
mDbHelper = new DatabaseHelper(this);
final List<userdetails> List = mDbHelper.selectAll();
for (int i = 0; i < List.size(); i++)
{
//Log.i("List of Data....", List.get(i));
}
for (int j = 0; j < List.size(); j++)
{
mylist.add(List.get(j));
Log.i("List View :", mylist.get(j).toString());
}
listView = (ListView)findViewById(R.id.listView);
adapter = new MyAdapter(this,mylist);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,View v,int position,long id) {
Toast.makeText(viewnameactivity.this,"Edit button of ID : "+ adapter.getUserArray(position)+" selected.",
Toast.LENGTH_SHORT).show();
pos = adapter.getUserArray(position);
}
});
mDbHelper.close();
Button btnBack = (Button)findViewById(R.id.btnBack);
btnBack.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(viewnameactivity.this,MainActivity.class);
startActivity(i);
}
});
/* Button btnEdit = (Button)findViewById(R.id.btnEdit);
btnEdit.setOnClickListener(new OnClickListener() {
//TextView strID = (TextView)findViewById(R.id.textID);
//long lngID = Long.parseLong(strID.getText().toString());
@Override
public void onClick(View v) {
Toast.makeText(viewnameactivity.this,"Edit button of ID : selected.",
Toast.LENGTH_SHORT).show();
}
});
Button btnDelete = (Button)findViewById(R.id.btndelete);
btnDelete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(viewnameactivity.this,"Delete button of ID : selected.",
Toast.LENGTH_SHORT).show();
}
});*/
}
public void OnClickEdit(View v){
//TextView strID = (TextView)this.findViewById(R.id.textID);
//long lngID = Long.parseLong(strID.getText().toString());
Toast.makeText(viewnameactivity.this,"Edit button of ID : "+ pos +" selected.",
Toast.LENGTH_SHORT).show();
}
public void OnClickDelete(View v){
TextView strID = (TextView)findViewById(R.id.textID);
long lngID = Long.parseLong(strID.getText().toString());
Toast.makeText(viewnameactivity.this,"Delete button of ID :"+ lngID + "selected.",
Toast.LENGTH_SHORT).show();
}
}
DatabaseOpenHelper Class :
package com.iwill.Database_add_display;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DatabaseHelper
{
public static final String KEY_NAME = "NAME";
public static final String KEY_MAIL = "EMAIL";
public static final String KEY_NO ="NO";
public static final String KEY_ID = "ID";
private static final String DATABASE_NAME = "info.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "user";
private static String DB_PATH = "/data/data/com.iwill.Database_add_display";
private static String DB_NAME = "info.db";
private static Context context;
private static SQLiteDatabase db;
private static final String TAG = "MEDIA";
public DatabaseHelper(Context context)
{
this.context = context;
OpenHelper openHelper = new OpenHelper(this.context);
this.db = openHelper.getWritableDatabase();
//this.insertStmt = this.db.compileStatement(INSERT);
}
public long insert(String uname,String mail,String no)
{
ContentValues CV = new ContentValues();
CV.put(KEY_NAME, uname);
CV.put(KEY_MAIL , mail);
CV.put(KEY_NO, no);
long rawId = db.insert(TABLE_NAME, null, CV);
return rawId;
}
public void update(long _ID,String updateuname,String updatemail,String updateno)
{
Log.i("tag","_ID"+_ID);
ContentValues cvupdate=new ContentValues();
cvupdate.put(KEY_NAME,updateuname);
cvupdate.put(KEY_MAIL, updatemail);
cvupdate.put(KEY_NO, updateno);
db.update(TABLE_NAME, cvupdate, "_id"+" = ?",new String[]{String.valueOf(_ID)});
Log.i("tag", "Item Updated Database Helper");
}
public void delete(long _ID)
{
this.db.delete(TABLE_NAME, "_id"+" = ?", new String[]{String.valueOf(_ID)});
Log.i("tag", "Item deleted");
}
public List<userdetails> selectAll(){
List<userdetails> list = new ArrayList<userdetails>();
Cursor cursor = this.db.query(TABLE_NAME, new String[] {"_id", "NAME", "EMAIL", "NO"},
null, null, null, null, "_id asc");
if(cursor.moveToFirst()){
do {
userdetails usd= new userdetails();
usd.setName(cursor.getString(1));
usd.setMail(cursor.getString(2));
usd.setNo(cursor.getString(3));
usd.setID(cursor.getLong(0));
list.add(usd);
} while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
return list;
}
public void close(){
db.close();
}
public List<String> selectAllid(){
List<String> list = new ArrayList<String>();
Cursor cursor = this.db.query(TABLE_NAME, new String[] {"_id", "NAME"},
null, null, null, null, "_id asc");
if(cursor.moveToFirst()){
do {
//list.add(cursor.getInt(0) + " "+cursor.getString(1));
list.add(cursor.getString(0));
Log.i("List 0 (id)....", cursor.getString(0));
Log.i("List 1 (URL)....", cursor.getString(1));
} while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
return list;
}
// TESTING
private static class OpenHelper extends SQLiteOpenHelper
{
public OpenHelper(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
String str = "CREATE TABLE IF NOT EXISTS user(_id INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT,EMAIL TEXT,NO TEXT)";
db.execSQL(str);
}
private boolean checkDatabase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
public void createNewDatabase() {
InputStream assetsDB = null;
try {
assetsDB = context.getAssets().open(DB_NAME);
OutputStream dbOut = new FileOutputStream(DB_PATH + DB_NAME);
byte[] buffer = new byte[1024];
int length;
while ((length = assetsDB.read(buffer)) > 0) {
dbOut.write(buffer, 0, length);
}
dbOut.flush();
dbOut.close();
assetsDB.close();
Log.i("New Database created.......", "New database created...");
} catch (IOException e) {
Log.e("Could not create new database...", "Could not create new database...");
e.printStackTrace();
}
}
@Override
public synchronized void close() {
if(db != null){
db.close();
super.close();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
//Log.w("Example", "Upgrading database, this will drop tables and recreate.");
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
}
Am kinda beginner and any help would be really appreciated. (:
回答1:
Try adding this to your adapter:
public class MyAdapter extends BaseAdapter
{
public static HashMap<Integer,String> myList=new HashMap<Integer,String>();
...
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
...
myList.put(position,String.valueOf(data.get(position).getID()));
return convertView;
}
...
}
Now in your activity,
public class viewnameactivity extends Activity
{
...
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,View v,int position,long id) {
pos = adapter.getUserArray(position);
String TVID=MyAdapter.myList.get(position); // this will give you tvid for each listitem
}
});
...
}
来源：https://stackoverflow.com/questions/9475636/how-to-get-rowid-of-custom-listviews-selected-rows-child