我正在創建一個將使用SQLite數據庫的android應用程序。我創建了一個名爲DBAdapter
的獨立類,其中包含與數據庫相關的所有方法。從另一個類訪問方法Android
我試圖從主要活動中訪問這些方法時出現問題。我仍然在學習,但我通常會實例化DBAdapter
類,然後我將能夠引用這些方法。然而我採取的方法沒有工作。下面是我如何嘗試實例化類的單行,並且在該類下面是該類的其餘部分。
我得到的錯誤是cannot resolve method 'open()'
實例化線和方法
DBAdapter db = new DBAdapter(this);
db.open();
主類
import android.app.Dialog;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.ContentFrameLayout;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
final Context context = this;
private FloatingActionButton fab;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DBAdapter db = new DBAdapter(this);
db.open();
fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Dialog dialog = new Dialog(context);
dialog.setContentView(R.layout.dialog_box);
dialog.setTitle("Add new Location!");
dialog.show();
final EditText NameEdit = (EditText) findViewById(R.id.NameInput);
final EditText LatEdit = (EditText) findViewById(R.id.LatInput);
final EditText LongEdit = (EditText) findViewById(R.id.LongInput);
final EditText PhoneEdit = (EditText) findViewById(R.id.PhoneInput);
final Button OkButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
final Button CancelButton = (Button) dialog.findViewById(R.id.dialogButtonCancel);
OkButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String RealName = NameEdit.getText().toString();
String Lat = LatEdit.getText().toString();
Float realLat = Float.parseFloat(Lat);
String Long = LongEdit.getText().toString();
Float realLong = Float.parseFloat(Long);
String Phone = PhoneEdit.getText().toString();
Double realPhone = Double.parseDouble(Phone);
//Use above to create a new Geofence
}
});
CancelButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dialog.dismiss();
}
});
}
});
}
}
DBAdpater類
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
/**
* Created by Rory on 09/09/2016.
*/
public class DBAdapter {
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
//Database Version & name
private static final String DATABASE_NAME = "OpenSesame";
private static final int DATABASE_VERSION = 1;
private static final String TAG = "DBMain";
private static final String GEOTABLE = "geoTable";
private static final String KEY_ID = "_id";
private static final String KEY_NAME = "name";
private static final String KEY_LAT = "lat";
private static final String KEY_LONG = "long";
private static final String KEY_RADIUS = "radius";
private static final String KEY_PHONE = "phone";
private static final String CREATE_GEO_TABLE = "CREATE TABLE "
+ GEOTABLE + "("
+ KEY_ID + " INTEGER PRIMARY KEY AUTO INCREMENT,"
+ KEY_NAME + " TEXT,"
+ KEY_LAT + " FLOAT,"
+ KEY_LONG + " FLOAT,"
+ KEY_RADIUS + " INTEGER,"
+ KEY_PHONE + " INTEGER" + ")";
public DBAdapter(Context ctx) {
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
/**
* Method to create each of the tables defined above
* @param db
*/
@Override
public void onCreate(SQLiteDatabase db)
{
try {
db.execSQL(CREATE_GEO_TABLE);
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* Method for updating the database
* @param db
* @param newVersion
* @param oldVersion
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
public DatabaseHelper open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
public void close() {
DBHelper.close();
}
public Cursor DeleteGeo(String name) {
return db.rawQuery("delete from geoTable where name = " + name, null);
}
public long AddGeo(String name, float lat, float lon, double phone, int radius) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_NAME, name);
initialValues.put(KEY_LAT, lat);
initialValues.put(KEY_LONG, lon);
initialValues.put(KEY_PHONE, phone);
initialValues.put(KEY_RADIUS, radius);
return db.insert(GEOTABLE, null, initialValues);
}
public Cursor GetAllGeos() {
return db.rawQuery("select * from geoTable order by name ASC", null);
}
}
}
發佈DB適配器代碼太 –
剛剛更新了問題並添加了它 – Rory
'DBAdapter'沒有'open()'方法。私有的內部類'DatabaseHelper'。你必須通過外部類來公開。 – jonhopkins