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我又有一個問題:( 我遇到這個錯誤是它不會創建一個名爲contacts的表，但我有創建數據庫的代碼，但它沒有創建it.How解決此再次感謝您的回答android SQLite數據庫..沒有這樣的表格：
package com.mobilebasedsignlanguage;
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
public class alphaconv extends Activity {
ArrayList<Contact> imageArry = new ArrayList<Contact>();
ContactImageAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.alphabetview);
DataBaseHandler db = new DataBaseHandler(this);
//get image from drawable..
Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.a);
//convert bitmap to byte
ByteArrayOutputStream stream = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte imageInByte[] = stream.toByteArray();
//Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addContact(new Contact("A", imageInByte));
//Read all contacts from db
List<Contact> contacts = db.getAllContacts();
for(Contact cn: contacts) {
String log = "ID: " + cn.getID() + "Name: " + cn.getName() + ", Image: " + cn.getImage();
Log.d("Result: ", log);
imageArry.add(cn);
}
adapter = new ContactImageAdapter(this, R.layout.screen_list, imageArry);
ListView dataList = (ListView)findViewById(R.id.list);
dataList.setAdapter(adapter);
}
}
這裏是其他Java類：？
Contact.java
package com.mobilebasedsignlanguage;
public class Contact {
int _id;
String _name;
byte[] _image;
public Contact() {
}
public Contact(int keyId, String name, byte[] image) {
this._id = keyId;
this._name = name;
this._image = image;
}
public Contact(String contactID, String name, byte[] image) {
this._name = name;
this._image = image;
}
public Contact(String name, byte[] image) {
this._name = name;
this._image = image;
}
public int getID() {
return this._id;
}
public void setID(int keyId) {
this._id = keyId;
}
public String getName() {
return this._name;
}
public void setName(String name) {
this._name = name;
}
public byte[] getImage() {
return this._image;
}
public void setImage(byte[] image) {
this._image = image;
}
}
CONTA ctImageAdapter.java
package com.mobilebasedsignlanguage;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class ContactImageAdapter extends ArrayAdapter<Contact>{
Context context;
int layoutResourceId;
ArrayList<Contact> data=new ArrayList<Contact>();
public ContactImageAdapter(Context context, int layoutResourceId, ArrayList<Contact> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
ImageHolder holder = null;
if(row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new ImageHolder();
holder.txtTitle = (TextView)row.findViewById(R.id.txtTitle);
holder.imgIcon = (ImageView)row.findViewById(R.id.imgIcon);
row.setTag(holder);
}
else
{
holder = (ImageHolder)row.getTag();
}
Contact picture = data.get(position);
holder.txtTitle.setText(picture._name);
byte[] outImage = picture._image;
ByteArrayInputStream imageStream = new ByteArrayInputStream(outImage);
Bitmap theImage = BitmapFactory.decodeStream(imageStream);
holder.imgIcon.setImageBitmap(theImage);
return row;
}
static class ImageHolder
{
ImageView imgIcon;
TextView txtTitle;
}
}
DbHandler.java
package com.mobilebasedsignlanguage;
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.SQLiteOpenHelper;
public class DataBaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "SLdb";
private static final String TABLE_CONTACTS = "contacts";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_IMAGE = "image";
public DataBaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_IMAGE + " BLOB" + ")";
db.execSQL(CREATE_CONTACTS_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
onCreate(db);
}
public void addContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact._name);
values.put(KEY_IMAGE, contact._image);
db.insert(TABLE_CONTACTS, null, values);
db.close();
}
Contact getContact(int id) {
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
KEY_NAME, KEY_IMAGE }, KEY_ID + "=?",
new String[] { String.valueOf(id) }, null,null,null,null);
if(cursor != null)
cursor.moveToFirst();
Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getBlob(1));
return contact;
}
public List<Contact> getAllContacts() {
List<Contact> contactlist = new ArrayList<Contact>();
String selectQuery = "SELECT * FROM contacts ORDER BY name";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setImage(cursor.getBlob(2));
contactlist.add(contact);
}while (cursor.moveToNext());
}
db.close();
return contactlist;
}
public int updateContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName());
values.put(KEY_IMAGE, contact.getImage());
return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
new String[] { String.valueOf(contact.getID()) });
}
public void deleteContact(Contact contact) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
new String[] {String.valueOf(contact.getID()) });
db.close();
}
public int getContactsCount() {
String countQuery = "SELECT * FROM " + TABLE_CONTACTS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
return cursor.getCount();
}
}
在日誌貓的錯誤是這樣的：
02-18 11:49:25.938: E/SQLiteLog(6044): (1) no such table: contacts
02-18 11:49:26.078: E/SQLiteDatabase(6044): Error inserting image=[[email protected] name=A
02-18 11:49:26.078: E/SQLiteDatabase(6044): android.database.sqlite.SQLiteException: no such table: contacts (code 1): , while compiling: INSERT INTO contacts(image,name) VALUES (?,?)
如果你沒有任何變化表架構的數據庫文件不會自動更新。強制執行的最簡單方法是卸載應用程序，以便數據庫被刪除並再次調用onCreate（）。 – laalto
如何做到這一點先生？我仍然試圖運行它到模擬器@laalto – kathleen55
例如，'adb uninstall your.package.name' – laalto