我创建了一个Android应用程序，并且能够在sqlite中创建用户表并注册用户。我想以用户身份使用用户名和密码登录该应用，并转到他们的个人资料。现在登录部分已经完成，问题是将sqlite数据库数据加载到用户配置文件中。
这是DataHandler类
public class DataHandler extends SQLiteOpenHelper{
public final static String col1 = "Id";
public final static String col2 = "Name";
public final static String col3 = "Email";
public final static String col4 = "Mobile";
public final static String col5 = "Password";
public final static String col6 = "Address";
public final static String col7 = "Category";
public final static String col8 = "Wages_per_hour";
public final static String col9 = "Experience";
public final static String col10 = "Job_Description";
private static final String DB_NAME = "UtilityNp";
private static final int DB_VERSION = 6;
public final static String Table_NAME = "Worker";
public final static String STRING_CREATE = "CREATE TABLE " + Table_NAME + " ("+col1+" INTEGER PRIMARY KEY AUTOINCREMENT DEFAULT 1, " + col2 + " varchar(25) NOT NULL, " + col3 + " varchar(25) NOT NULL, " + col4 + " varchar(25) NOT NULL, " + col5 + " varchar(25) NOT NULL, " + col6 + " varchar(25) NOT NULL, " + col7 + " varchar(25) NOT NULL, " + col8 + " varchar(25) NOT NULL, " + col9 + " varchar(25) NOT NULL, " + col10 + " varchar(25) NOT NULL);";
public final static String DROP_TABLE = "DROP TABLE IF EXISTS " + Table_NAME;
public DataHandler(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
SQLiteDatabase db;
@Override
public void onCreate(SQLiteDatabase db) {
try {
db.execSQL(STRING_CREATE);
System.out.println("oncreate called");
} catch (Exception e) {
System.out.println(e);
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
try {
db.execSQL(DROP_TABLE);
onCreate(db);
System.out.println("onupgrade called");
} catch (Exception e) {
System.out.println(e);
}
}
public DataHandler open(){
db = this.getWritableDatabase();
return this;
}
public void close(){
db.close();
}
public long insertData(String a, String b, String c, String d, String e, String f, String g, String h, String i)
{
ContentValues cv = new ContentValues();
cv.put(col2,a);
cv.put(col3,b);
cv.put(col4,c);
cv.put(col5,d);
cv.put(col6,e);
cv.put(col7,f);
cv.put(col8,g);
cv.put(col9,h);
cv.put(col10, i);
return db.insertOrThrow(Table_NAME, null, cv);
}
public String getSinlgeEntry(String userName)
{
Cursor cursor=db.query("Worker", null, " Name=?", new String[]{userName}, null, null, null);
if(cursor.getCount()<1) // UserName Not Exist
{
cursor.close();
return "NOT EXIST";
}
cursor.moveToFirst();
String password= cursor.getString(cursor.getColumnIndex("Password"));
cursor.close();
return password;
}
}
它是登录类。
public class Login extends Activity {
Button login;
EditText editTextUserName, editTextPassword;
DataHandler loginDataBaseAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
loginDataBaseAdapter=new DataHandler(this);
loginDataBaseAdapter.open();
login =(Button)findViewById(R.id.login);
// get the Refferences of views
editTextUserName=(EditText) findViewById(R.id.uname);
editTextPassword= (EditText) findViewById(R.id.pass);
// Set On ClickListener
login.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// get The User name and Password
String userName = editTextUserName.getText().toString();
String password = editTextPassword.getText().toString();
// fetch the Password form database for respective user name
String storedPassword = loginDataBaseAdapter.getSinlgeEntry(userName);
if (userName.length() > 0 && password.length() > 0) {
if (password.equals(storedPassword)) {
Toast.makeText(Login.this, "Successfully Logged In", Toast.LENGTH_LONG).show();
//Starting a new Intent
Intent nextScreen = new Intent(getApplicationContext(), User_Profile.class);
startActivity(nextScreen);
} else {
Toast.makeText(Login.this, "User Name or Password does not match", Toast.LENGTH_LONG).show();
}
} else {
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(Login.this);
alertBuilder.setTitle("Invalid Data");
alertBuilder.setMessage("Please, Enter valid data");
alertBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertBuilder.create().show();
}
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
// Close The Database
loginDataBaseAdapter.close();
}
}
现在，在记录之后，我希望用户可以使用用户的信息定向到此活动。
这是xml文件。
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/scrollView1"
android:scrollbarAlwaysDrawVerticalTrack="true"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="48dp"
android:background="#e8e8e7"
android:orientation="horizontal"
android:layout_alignParentTop="true">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Your Profile"
android:textColor="#2582C5"
android:layout_marginLeft="5dp"
android:textSize="23sp"
android:textStyle="bold"
android:layout_gravity="center_horizontal|center_vertical"/>
</LinearLayout>
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginTop="10dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="30dp"
android:orientation="vertical"
android:weightSum="1">
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Username"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="15dp"
android:id="@+id/name"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Email"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/email"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Mobile"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:id="@+id/mobile"
android:layout_marginTop="10dp"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Password"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/psw"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Address"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/ad"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Category"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/cat"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Wages per Hour"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/wages"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Experience"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/experience"/>
<EditText android:layout_width="fill_parent"
android:layout_height="40dp"
android:hint="Job Description"
android:background="#f3f3f3"
android:paddingLeft="5dp"
android:layout_marginTop="10dp"
android:id="@+id/jdesc"/>
<Button
android:layout_width="190dp"
android:layout_height="40dp"
android:layout_marginTop="16dp"
android:textSize="20dp"
android:text="Submit"
android:textColor="#ffffff"
android:id="@+id/submit"
android:layout_gravity="center"
android:layout_weight="0.18" />
</LinearLayout>
</LinearLayout>
如果有人能帮助我，我会很感激。