AS I am beginer in android in my android applicationas as i have my own sqlitedatabase as "data.db"stored it in an asset folder but when i am running it i am getting error of activity (com.db) is forcedfully closed when i debbuged it i found that debbuger is pointing to the throw new error{"unable to create"} below is my code for DatabaseHelper.java
package com.connect;
import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream;
import android.content.Context; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteException; import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/com.connect/databases/";
private static String DB_NAME = "nilesh.db";
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, 1);
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){
//do nothing - database already exist
}else{
//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) {
}
} here is code for connection.java package com.DB;
import java.io.IOException; import java.util.Locale;
import android.R.string; import android.app.Activity; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteException; import android.os.Bundle; import android.widget.TextView; import android.widget.Toast; import com.DB.DatabaseHelper; public class connection extends Activity { /** Called when the activity is first created. */ TextView TextView01; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView01=(TextView)findViewById(R.id.TextView01);
DatabaseHelper dcon= new DatabaseHelper(this);
dcon = new DatabaseHelper(this);
try{
dcon.createDatabase();
}catch (IOException e) {
throw new Error("unable to create"); // debugger current instruction position
}
try{
dcon.open();
}
catch (SQLException sqle) {
throw sqle;
}
SQLiteDatabase db;
db = openOrCreateDatabase(
"data.db"
, SQLiteDatabase.CREATE_IF_NECESSARY
, null);
db.setVersion(1);
db.setLocale(Locale.getDefault());
db.setLockingEnabled(true);
Cursor c = db.rawQuery("select * from school",null);
c.moveToPosition(1);
int aaa = c.getColumnIndex("_id");
String bbb= c.getString(aaa);
TextView01.setText(bbb.toString());
// while (c.isAfterLast() == false)
// Toast.makeText(this,bbb,20000);
// c.moveToNext();
// }
c.close();
db.close();
dcon.close();
}
}
here is code of main xml
can anybody help me out why i am getting this problem & not getting output thanks in advance plz somebody help me out