我是android的初学者，iam正在从事我的毕业设计，该项目在这里显示了埃及iam面临的所有问题在埃及的所有城市和地方
我希望活动看起来像这样layout
这是我的数据库适配器
package com.example.android.spot.Db;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import com.example.android.spot.Models.City;
import com.example.android.spot.Models.Place;
import com.example.android.spot.Models.User;
import java.util.List;
public class SpotDbAdapter extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
static final String DATABASE_NAME = "Spot.db";
private Context context;
public SpotDbAdapter(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
final String SQL_CREATE_User_TABLE = "CREATE TABLE " + SpotContract.UserEntry.Table_Name + " (" +
SpotContract.UserEntry.COLUMN_User_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
SpotContract.UserEntry.COLUMN_Name + " TEXT NOT NULL, " +
SpotContract.UserEntry.COLUMN_password + " TEXT NOT NULL, " +
SpotContract.UserEntry.COLUMN_Email + " TEXT NOT NULL, " +
SpotContract.UserEntry.COLUMN_Image + " TEXT " +
" );";
final String SQL_CREATE_Cities_TABLE = "CREATE TABLE " + SpotContract.CitiesEntry.Table_Name + " (" +
SpotContract.CitiesEntry.COLUMN_City_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
SpotContract.CitiesEntry.COLUMN_Name + " TEXT NOT NULL, " +
SpotContract.CitiesEntry.COLUMN_Image + " TEXT " +
" );";
final String SQL_CREATE_Places_TABLE = "CREATE TABLE " + SpotContract.PlacesEntry.Table_Name + " (" +
SpotContract.PlacesEntry.COLUMN_Place_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
SpotContract.PlacesEntry.COLUMN_Name + " TEXT NOT NULL, " +
SpotContract.PlacesEntry.COLUMN_Image + " TEXT, " +
SpotContract.PlacesEntry.COLUMN_Description + " TEXT, " +
SpotContract.PlacesEntry.COLUMN_Address + " TEXT, " +
SpotContract.PlacesEntry.COLUMN_Contact + " TEXT DEFAULT NULL, " +
SpotContract.PlacesEntry.COLUMN_Category + " TEXT, " +
SpotContract.PlacesEntry.COLUMN_city_name + " TEXT NOT NULL " +
" );";
/*" FOREIGN KEY (" + SpotContract.PlacesEntry.COLUMN_city_name + ") REFERENCES " +
SpotContract.CitiesEntry.Table_Name + " (" + SpotContract.CitiesEntry.COLUMN_Name + ") " +*/
db.execSQL(SQL_CREATE_User_TABLE);
db.execSQL(SQL_CREATE_Cities_TABLE);
db.execSQL(SQL_CREATE_Places_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + SpotContract.UserEntry.Table_Name);
db.execSQL("DROP TABLE IF EXISTS " + SpotContract.PlacesEntry.Table_Name);
db.execSQL("DROP TABLE IF EXISTS " + SpotContract.CitiesEntry.Table_Name);
onCreate(db);
}
public User Authenticate(User user) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(SpotContract.UserEntry.Table_Name,// Selecting Table
new String[]{SpotContract.UserEntry.COLUMN_User_ID, SpotContract.UserEntry.COLUMN_Name, SpotContract.UserEntry.COLUMN_Email, SpotContract.UserEntry.COLUMN_password},//Selecting columns want to query
SpotContract.UserEntry.COLUMN_Email + "=?",
new String[]{user.email},//Where clause
null, null, null);
if (cursor != null && cursor.moveToFirst()&& cursor.getCount()>0) {
//if cursor has value then in user database there is user associated with this given email
User user1 = new User(cursor.getString(0), cursor.getString(1), cursor.getString(2), cursor.getString(3));
//Match both passwords check they are same or not
if (user.password.equalsIgnoreCase(user1.password)) {
return user1;
}
}
//if user password does not matches or there is no record with that email then return @false
return null;
}
public boolean isEmailExists(String email) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(SpotContract.UserEntry.Table_Name,// Selecting Table
new String[]{SpotContract.UserEntry.COLUMN_User_ID, SpotContract.UserEntry.COLUMN_Name, SpotContract.UserEntry.COLUMN_Email, SpotContract.UserEntry.COLUMN_password},//Selecting columns want to query
SpotContract.UserEntry.COLUMN_Email + "=?",
new String[]{email},//Where clause
null, null, null);
if (cursor != null && cursor.moveToFirst()&& cursor.getCount()>0) {
//if cursor has value then in user database there is user associated with this given email so return true
return true;
}
//if email does not exist return false
return false;
}
public Cursor selectAllCities(){
SQLiteDatabase db = getWritableDatabase();
Cursor mCursor = db.rawQuery("SELECT * FROM " + SpotContract.CitiesEntry.Table_Name,null);
if (mCursor != null) {
mCursor.moveToFirst();
if (mCursor.moveToFirst()) {
do {
Log.e("city",mCursor.getString(1)+mCursor.getString(2));
} while (mCursor.moveToNext());
}
}
return mCursor;
}
public Cursor selectPlaces(String category, String city){
SQLiteDatabase db = this.getWritableDatabase();
Cursor mCursor = db.query(SpotContract.PlacesEntry.Table_Name,new String[]{"*"}, SpotContract.PlacesEntry.COLUMN_Category +"=?"+" AND "+ SpotContract.PlacesEntry.COLUMN_city_name+ "=?",
new String[]{category,city}, null, null, null);
if(mCursor.getCount()==0){
new SpotData(context).insertPlacesRecords();
}
if (mCursor != null) {
mCursor.moveToFirst();
if (mCursor.moveToFirst()) {
do {
Log.e("place",mCursor.getString(1)+mCursor.getString(2));
} while (mCursor.moveToNext());
}
}
return mCursor;
}
public Cursor selectPlaces(String city){
SQLiteDatabase db = this.getWritableDatabase();
Cursor mCursor = db.query(SpotContract.PlacesEntry.Table_Name,new String[]{"*"}, SpotContract.PlacesEntry.COLUMN_Category +"=?",
new String[]{city}, null, null, null);
if(mCursor.getCount()==0){
new SpotData(context).insertPlacesRecords();
}
if (mCursor != null) {
mCursor.moveToFirst();
if (mCursor.moveToFirst()) {
do {
Log.e("place",mCursor.getString(1)+mCursor.getString(2));
} while (mCursor.moveToNext());
}
}
return mCursor;
}
public long addUser(User user) {
//get writable database
SQLiteDatabase db = this.getWritableDatabase();
//create content values to insert
ContentValues values = new ContentValues();
//Put username in @values
values.put(SpotContract.UserEntry.COLUMN_Name, user.userName);
//Put email in @values
values.put(SpotContract.UserEntry.COLUMN_Email, user.email);
//Put password in @values
values.put(SpotContract.UserEntry.COLUMN_password, user.password);
// insert row
long todo_id = db.insert(SpotContract.UserEntry.Table_Name, null, values);
return todo_id;
}
public void addCity(List<City> cityList){
SQLiteDatabase db = this.getWritableDatabase();
for (int i = 0 ; i < cityList.size();i++){
ContentValues values = new ContentValues();
values.put(SpotContract.CitiesEntry.COLUMN_Name,cityList.get(i).cityName);
values.put(SpotContract.CitiesEntry.COLUMN_Image,cityList.get(i).cityImage);
long todo_id = db.insert(SpotContract.CitiesEntry.Table_Name, null, values);
}
Log.e("data","done");
db.close();
}
public void addPlace(List <Place> placeList){
SQLiteDatabase db = this.getWritableDatabase();
for (int i = 0 ; i < placeList.size();i++){
ContentValues values = new ContentValues();
values.put(SpotContract.PlacesEntry.COLUMN_Name,placeList.get(i).placeName);
values.put(SpotContract.PlacesEntry.COLUMN_Image,placeList.get(i).placeImage);
values.put(SpotContract.PlacesEntry.COLUMN_Description,placeList.get(i).placeDescription);
values.put(SpotContract.PlacesEntry.COLUMN_Address,placeList.get(i).address);
values.put(SpotContract.PlacesEntry.COLUMN_Contact,placeList.get(i).contact);
values.put(SpotContract.PlacesEntry.COLUMN_Category,placeList.get(i).category);
values.put(SpotContract.PlacesEntry.COLUMN_city_name,placeList.get(i).city_name);
long todo_id = db.insert(SpotContract.PlacesEntry.Table_Name, null, values);
}
Log.e("data","done,done");
db.close();
}
}
这是我的光标适配器
package com.example.android.spot;
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.example.android.spot.Db.SpotContract;
import com.squareup.picasso.Picasso;
/**
* Created by CRIZMA-PC&LAPTOP on 28/06/2018.
*/
public class SpotCursorAdapter extends CursorAdapter {
public SpotCursorAdapter(Context context, Cursor c) {
super(context, c, 0 /* flags */);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return LayoutInflater.from(context).inflate(R.layout.cities_list_item, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView CityNameTextView = (TextView) view.findViewById(R.id.cityNameText);
ImageView CityImageView = (ImageView) view.findViewById(R.id.cityImage);
// Find the columns of attributes that we're interested in
int cityNameColumnIndex = cursor.getColumnIndex(SpotContract.CitiesEntry.COLUMN_Name);
int cityImageColumnIndex = cursor.getColumnIndex(SpotContract.CitiesEntry.COLUMN_Image);
// Read the attributes from the Cursor for the current city
String cityName = cursor.getString(cityNameColumnIndex);
String cityImage = cursor.getString(cityImageColumnIndex);
// Update the TextView and ImageView with the attributes for the current city
CityNameTextView.setText(cityName);
Picasso.with(context).load(cityImage).into(CityImageView);
}
}
这是我的CitiesActivity
import android.content.ContentUris;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import com.example.android.spot.Db.SpotContract;
import com.example.android.spot.Db.SpotDbAdapter;
public class CitiesActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cities);
ListView citiesListView = (ListView) findViewById(R.id.list);
Cursor cursor = new SpotDbAdapter(this).selectAllCities();
SpotCursorAdapter adapter = new SpotCursorAdapter(this, cursor);
// Setup the item click listener
citiesListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(CitiesActivity.this, PlacesActivity.class);
// Form the content URI that represents the specific city that was clicked on,
// by appending the "id" (passed as input to this method) onto the
// {@link CitiesEntry#CONTENT_URI}.
// For example, the URI would be "content://com.example.android.cities/cities/2"
// if the city with ID 2 was clicked on.
Uri currentCityUri = ContentUris.withAppendedId(SpotContract.CitiesEntry.CONTENT_URI1, id);
// Set the URI on the data field of the intent
intent.setData(currentCityUri);
startActivity(intent);
}
});
}
}
这是我运行应用程序时得到的 result
这是logcat的内容
06-29 16:23:07.876 2639-2657/com.example.android.spot E/EGL_emulation: tid 2657: eglSurfaceAttrib(1210): error 0x3009 (EGL_BAD_MATCH)
06-29 16:23:09.276 2639-2639/com.example.android.spot E/city: Ain Sokhna
06-29 16:23:09.276 2639-2639/com.example.android.spot E/city: Taba
06-29 16:23:09.276 2639-2639/com.example.android.spot E/city: Gouna
06-29 16:23:09.276 2639-2639/com.example.android.spot E/city: Marsa Matrouh
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Hurghada
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Neama Bay
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Luxor
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: El Mansourahttps://famouslogos.net/images/kfc-logo.jpg
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Giza
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Al-Minya
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Alexandria
06-29 16:23:09.277 2639-2639/com.example.android.spot E/city: Cairo
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Ain Sokhna
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Taba
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Gouna
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Marsa Matrouh
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Hurghada
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Neama Bay
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Luxor
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: El Mansoura
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Giza
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Al-Minya
06-29 16:23:09.277 2639-2639/com.example.android.spot E/lo: Alexandria
06-29 16:23:09.278 2639-2639/com.example.android.spot E/lo: Cairo
06-29 16:23:09.387 2639-2657/com.example.android.spot E/EGL_emulation: tid 2657: eglSurfaceAttrib(1210): error 0x3009 (EGL_BAD_MATCH)
06-29 16:23:11.155 2639-2639/com.example.android.spot E/city: Ain Sokhna
06-29 16:23:11.155 2639-2639/com.example.android.spot E/city: Taba
06-29 16:23:11.155 2639-2639/com.example.android.spot E/city: Gouna
06-29 16:23:11.155 2639-2639/com.example.android.spot E/city: Marsa Matrouh
06-29 16:23:11.155 2639-2639/com.example.android.spot E/city: Hurghada
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: Neama Bay
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: Luxor
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: El Mansourahttps://famouslogos.net/images/kfc-logo.jpg
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: Giza
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: Al-Minya
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: Alexandria
06-29 16:23:11.156 2639-2639/com.example.android.spot E/city: Cairo
06-29 16:23:11.235 2639-2657/com.example.android.spot E/EGL_emulation: tid 2657: eglSurfaceAttrib(1210): error 0x3009 (EGL_BAD_MATCH)
我无法弄清楚问题是什么，我需要向该城市活动显示数据库中的所有城市内容
答案 0 :(得分：0)
类似于您，我最近才开始使用android应用和sql数据库，因此，我强烈建议您切换到新的Architecture-components-libraries：
“新的”房间持久性库具有清晰的结构和方便的编译时警告，可轻松实现数据库流量。
特别是对于您的用例，我建议您检查一下“带有视图的房间”代码实验室。至少这是我开始的地方，它使我对如何使用房间库作为mysql数据库的接口并在recycler视图中显示所提到的数据有了很好的了解，据我所知，它比a效率更高。正常的列表视图，归因于动态数据绑定。
以下是代码实验室的链接，希望对您有所帮助： https://codelabs.developers.google.com/codelabs/android-room-with-a-view/#0