sqlite Datenbank einbinden

public class DataBaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/de.example.databasehelper/databases/";
//private static String DB_PATH = "context.getApplicationInfo().dataDir/databases/";
// Data Base Name.
private static final String DATABASE_NAME = "datenbank.db";
// Data Base Version.
private static final int DATABASE_VERSION = 1;
// Table Names of Data Base.
static final String TABLE_Name1 = "message";
static final String TABLE_Name2 = "sequence";
static final String TABLE_Name3 = "chat";
public Context context;
static SQLiteDatabase sqliteDataBase;
public DataBaseHelper(Context context) {
super(context, DATABASE_NAME, null ,DATABASE_VERSION);
this.context = context;
}

//check if the database exists
public void createDataBase() throws IOException{
boolean databaseExist = checkDataBase();
if(databaseExist){
// Do Nothing.
}else{
this.getWritableDatabase();
copyDataBase();
// TODO Auto-generated catch block
}
}// end if else dbExist
// end createDataBase().
public boolean checkDataBase(){
File databaseFile = new File(DB_PATH + DATABASE_NAME);
return databaseFile.exists();
}
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = context.getAssets().open(DATABASE_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DATABASE_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the input file to the output file
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();
}
/**
* This method opens the data base connection.
* First it create the path up till data base of the device.
* Then create connection with data base.
*/
public void openDataBase() throws SQLException{
//Open the database
try {
createDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String myPath = DB_PATH + DATABASE_NAME;
sqliteDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
/**
* This Method is used to close the data base connection.
*/
@Override
public synchronized void close() {
if(sqliteDataBase != null)
sqliteDataBase.close();
super.close();
}
//declare methods to fetch data
public Cursor getBasicCategoryDetails(){
return sqliteDataBase.rawQuery("Select data from messages where _id = 1", null);
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub
    
}
}

03-21 14:42:15.374: E/AndroidRuntime(2683): FATAL EXCEPTION: main
03-21 14:42:15.374: E/AndroidRuntime(2683): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{de.example.databasehelper/de.example.databasehelper.DataBaseHelper}: java.lang.InstantiationException: can't instantiate class de.example.databasehelper.DataBaseHelper; no empty constructor
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.os.Looper.loop(Looper.java:137)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.ActivityThread.main(ActivityThread.java:5103)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at java.lang.reflect.Method.invokeNative(Native Method)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at java.lang.reflect.Method.invoke(Method.java:525)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at dalvik.system.NativeStart.main(Native Method)
03-21 14:42:15.374: E/AndroidRuntime(2683): Caused by: java.lang.InstantiationException: can't instantiate class de.example.databasehelper.DataBaseHelper; no empty constructor
03-21 14:42:15.374: E/AndroidRuntime(2683):     at java.lang.Class.newInstanceImpl(Native Method)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at java.lang.Class.newInstance(Class.java:1130)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
03-21 14:42:15.374: E/AndroidRuntime(2683):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
03-21 14:42:15.374: E/AndroidRuntime(2683):     ... 11 more

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.example.databasehelper"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="de.example.databasehelper.DataBaseHelper"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>