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我希望顯示位置名稱根據城市名稱從數據庫中選擇微調，但它顯示城市名稱在微調，我希望它顯示的位置根據城市選擇我選擇城市選擇使用:: cur = myDataBase.rawQuery（「從CityType中選擇cityName」，null）;所以它顯示城市名稱在微調。值來自sqlite管理器數據庫保存在資產folder..but當我去選擇位置它不顯示任何位置保存在數據庫中，即在微調框中空白，所以位置值不顯示下面是兩個Java類 DataBaseHelper.java和gqmain.javaSQLiteDatabase創建並從未關閉
package cabs.h;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.R.string;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DataBaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static final int DATABASE_VERSION = 1;
private static String DB_PATH = "/data/data/cabs.h/databases/";
private static String DB_NAME = "CabBookingDatabase.sqlite";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, DATABASE_VERSION);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if (dbExist) {
Log.v("DB Exists", "db exists");
// By calling this method here onUpgrade will be called on a
// writeable database, but only if the version number has been
// bumped
this.getWritableDatabase();
}
dbExist = checkDataBase();
if (!dbExist) {
// By calling this method and empty database will be created into
// the default system path of your application so we are gonna be
// able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e)
{
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException
{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w("tag", "Upgrading database from version which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS liberQuoti");
onCreate(db);
}
public Cursor getcity()
{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Cursor cur ;
cur = myDataBase.rawQuery("select cityName from CityType", null);
int citynameIndex = cur.getColumnIndexOrThrow("cityName");
//String valuecity = cur.getString(citynameIndex);
//Log.d("No.of tweets,,,,,,,", valuecity);
cur.moveToFirst();
// Log.d("No.of tweets,,,,,,,", +accountnameIndex + "tgr");
return cur;
}
**public Cursor getloc()
{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Cursor cur1;
String saa = cabbookingapplication.Selection;
// String sql = " select CityType.rowid from CityType where CityType.cityName = "+saa;
String sql = "SELECT CityType.rowid, Location.locationName FROM Location, CityType " +
"WHERE Location.cityId = CityType.rowid " +
"AND CityType.cityName = " + saa;
//cur1 = myDataBase.rawQuery(
// " SELECT locationName FROM Location WHERE cityId in (" +sql+ ")",null);
cur1 = myDataBase.rawQuery(
sql, null);
cur1.moveToFirst();
return cur1;**
}
public Cursor getservice()
{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Cursor cur3;
cur3 = myDataBase.rawQuery("select serviceType from ServiceType", null);
cur3.moveToFirst();
return cur3;
}
public Cursor getcabtype()
{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Cursor cur4;
cur4 = myDataBase.rawQuery("select carType from CarType", null);
cur4.moveToFirst();
myDataBase.close();
return cur4;
}
public Cursor getcabservice()
{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Cursor cur5;
cur5 = myDataBase.rawQuery("select cabFeatures from CabFeatures", null);
cur5.moveToFirst();
myDataBase.close();
return cur5;
}
public Cursor getday()
{
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
Cursor cur6;
cur6 = myDataBase.rawQuery("select dayTravell from DayTravell", null);
cur6.moveToFirst();
myDataBase.close();
return cur6;
}
}
and gqmain.java is
package cabs.h;
import java.io.IOException;
import android.R.string;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
public class gqMain extends Activity {
public Spinner spinner;
public Spinner spinner2;
static String s13;
private SQLiteDatabase myDataBase;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.cform2);
DataBaseHelper mDbHelper = new DataBaseHelper(this);
mDbHelper = new DataBaseHelper(this);
try {
mDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database......");
}
try {
mDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
spinner = (Spinner) findViewById(R.id.sp1);
spinner2 = (Spinner) findViewById(R.id.sp2);
ArrayAdapter adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
ArrayAdapter adapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner2.setAdapter(adapter2);
Bundle b = getIntent().getExtras();
final int pos = (b != null)?b.getInt("pos"):-1;
Button button1 = (Button) findViewById(R.id.btn1);
cabbookingapplication.Selection = (String)spinner.getSelectedItem();
cabbookingapplication.Selection2 = (String)spinner2.getSelectedItem();
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//cabbookingapplication cab = new cabbookingapplication();
cabbookingapplication.Selection = (String)spinner.getSelectedItem();
String s11= cabbookingapplication.Selection;
cabbookingapplication.Selection2 = (String)spinner2.getSelectedItem();
String s12= cabbookingapplication.Selection2;
EditText mTitleText1 = (EditText) findViewById(R.id.etext1);
cabbookingapplication.Selection3 =(mTitleText1.getText().toString());
String s13= cabbookingapplication.Selection3;
EditText mTitleText2 = (EditText) findViewById(R.id.etext2);
cabbookingapplication.Selection4 =(mTitleText2.getText().toString());
String s14= cabbookingapplication.Selection4;
String ff= s11+","+s12+s13+s14;
// SharedPreferences settings = getSharedPreferences(PREFS_NAME,0);
// mTitleText1.setText(String.valueOf(settings.getString("exactadd"," ")));
// mTitleText2.setText(String.valueOf(settings. getString("nearby"," ")));
// Editor ed = settings.edit();
// ed.putString("exactadd",mTitleText1.getText().toString());
// ed.putString("nearby",mTitleText2.getText().toString());
// ed.commit();
setResult(RESULT_OK);
System.out.println("On Submit button Click.......");
Intent i = new Intent(gqMain.this, ListActivity.class);
System.out.println("text send ===== "+ff);
//return edit text value along wid position of list item
i.putExtra("text", ff);
i.putExtra("pos", pos);
startActivity(i);
}
});
try{
Cursor cur = mDbHelper.getcity();
this.startManagingCursor(cur);
int accountnameIndex = cur.getColumnIndexOrThrow("cityName");
if(cur.moveToFirst()){
do{
//adapterForSpinner.add(c.getString(firstnameColumnIndex) + "aged " + c.getShort(ageColumnIndex));
adapter.add(cur.getString(accountnameIndex));
} while(cur.moveToNext());
}
} finally {
}
try{
Cursor cur1 = mDbHelper.getloc();
this.startManagingCursor(cur1);
int accountnameIndex = cur1.getColumnIndexOrThrow("locationName");
if(cur1.moveToFirst()){
do{
//adapterForSpinner.add(c.getString(firstnameColumnIndex) + "aged " + c.getShort(ageColumnIndex));
adapter2.add(cur1.getString(accountnameIndex));
} while(cur1.moveToNext());
}
} finally {
}
}
}
這樣做的一個用於值也顯示位置微調，根據選擇的城市..
我也嘗試在getloc（）
String sql = "select CityType.rowid from CityType where CityType.cityName = "
+ saa;
cur1 = myDataBase.rawQuery(
"SELECT locationName FROM Location WHERE cityId in (" + sql + ")", null);