我试图在android开发工作室上创建一个简单的CRUD表单。
我可以将数据输入到数据库中，但它似乎只能选择“县”＃39; texField。因此，每条记录都设置为县textField中的任何记录。我认为它可能与项目变量和声明有关，但我不知道什么是错的。 提前谢谢。
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainDatabase extends AppCompatActivity {
private static final String TAG = "MainDatabase";
DatabaseHelper mDatabaseHelper;
private Button btnAdd, btnViewData;
private EditText editText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = findViewById(R.id.editText);
editText = findViewById(R.id.editTextLast);
editText = findViewById(R.id.editPassword);
editText = findViewById(R.id.editPasswordConfirm);
editText = findViewById(R.id.editPhoneNumber);
editText = findViewById(R.id.editEmailAddress);
editText = findViewById(R.id.editAddressLine1);
editText = findViewById(R.id.editAddressLine2);
editText = findViewById(R.id.postcodeUser);
editText = findViewById(R.id.county);
btnAdd = findViewById(R.id.btnAdd);
btnViewData = findViewById(R.id.btnView);
mDatabaseHelper = new DatabaseHelper(this);
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String newEntry = editText.getText().toString();
String newName = editText.getText().toString();
Integer newPass = Integer.parseInt(editText.getText().toString());
String newPhone = editText.getText().toString();
String newEmail = editText.getText().toString();
String newAdd1 = editText.getText().toString();
String newAdd2 = editText.getText().toString();
String newPC = editText.getText().toString();
String newCounty = editText.getText().toString();
if (editText.length() != 0) {
AddData(newEntry, newName, newPass, newPhone, newEmail, newAdd1, newAdd2, newPC, newCounty);
editText.setText("");
} else {
toastMessage("You must put something in the text field!");
}
}
});
btnViewData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainDatabase.this, ListDataActivity.class);
startActivity(intent);
}
});
}
public void AddData(String newEntry, String newName, Integer newPass, String newPhone, String newEmail, String newAdd1, String newAdd2, String newPC, String newCounty) {
boolean insertData = mDatabaseHelper.addData(newEntry,newName,newPass,newPhone,newEmail,newAdd1,newAdd2,newPC,newCounty);
if (insertData) {
toastMessage("Data Successfully Inserted!");
} else {
toastMessage("Something went wrong");
}
}
/**
* customizable toast
* @param message
*/
private void toastMessage(String message){
Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
}
}
数据库助手
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
/**
* Created by User on 2/28/2017.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String TAG = "DatabaseHelper";
private static final String TABLE_NAME = "people_table";
private static final String COL1 = "ID";
private static final String COL2 = "name";
private static final String COL3 = "lastname";
private static final String COL4 = "phonenumber";
private static final String COL5 = "addressline1";
private static final String COL6 = "addressline2";
private static final String COL7 = "postcode";
private static final String COL8 = "county";
private static final String COL9 = "email";
private static final String COL10 = "password";
public DatabaseHelper(Context context) {
super(context, TABLE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (" + COL1 + " INTEGER PRIMARY KEY AUTOINCREMENT," +
COL2 +" TEXT," +
COL3 +" TEXT," +
COL4 +" INTEGER," +
COL5 +" TEXT," +
COL6 +" TEXT,"+
COL7 +" TEXT,"+
COL8 +" TEXT,"+
COL9 +" TEXT,"+
COL10 +" TEXT" + ")";
db.execSQL(createTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP IF TABLE EXISTS " + TABLE_NAME);
onCreate(db);
}
public boolean addData(String item, String item2, Integer item3, String item4, String item5, String item6, String item7, String item8, String item9) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL2, item);
contentValues.put(COL3, item2);
contentValues.put(COL4, item3);
contentValues.put(COL5, item4);
contentValues.put(COL6, item5);
contentValues.put(COL7, item6);
contentValues.put(COL8, item7);
contentValues.put(COL9, item8);
contentValues.put(COL10, item9);
Log.d(TAG, "addData: Adding " + item + item2 + item3 + item4 + item5 + item6 + item7 + item8 + item9 + " to " + TABLE_NAME);
long result = db.insert(TABLE_NAME, null, contentValues);
//if date as inserted incorrectly it will return -1
if (result == -1) {
return false;
} else {
return true;
}
}
/**
* Returns all the data from database
* @return
*/
public Cursor getData(){
SQLiteDatabase db = this.getWritableDatabase();
String query = "SELECT * FROM " + TABLE_NAME;
Cursor data = db.rawQuery(query, null);
return data;
}
/**
* Returns only the ID that matches the name passed in
* @param name
* @return
*/
public Cursor getItemID(String name){
SQLiteDatabase db = this.getWritableDatabase();
String query = "SELECT " + COL1 + " FROM " + TABLE_NAME +
" WHERE " + COL2 + " = '" + name + "'";
Cursor data = db.rawQuery(query, null);
return data;
}
/**
* Updates the name field
* @param newName
* @param id
* @param oldName
*/
public void updateName(String newName, int id, String oldName){
SQLiteDatabase db = this.getWritableDatabase();
String query = "UPDATE " + TABLE_NAME + " SET " + COL2 +
" = '" + newName + "' WHERE " + COL1 + " = '" + id + "'" +
" AND " + COL2 + " = '" + oldName + "'";
Log.d(TAG, "updateName: query: " + query);
Log.d(TAG, "updateName: Setting name to " + newName);
db.execSQL(query);
}
/**
* Delete from database
* @param id
* @param name
*/
public void deleteName(int id, String name){
SQLiteDatabase db = this.getWritableDatabase();
String query = "DELETE FROM " + TABLE_NAME + " WHERE "
+ COL1 + " = '" + id + "'" +
" AND " + COL2 + " = '" + name + "'";
Log.d(TAG, "deleteName: query: " + query);
Log.d(TAG, "deleteName: Deleting " + name + " from database.");
db.execSQL(query);
}
}
查看
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ScrollView01"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.unn.android.loginregister.MainDatabase">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/relativeLayout1">
<EditTextFirst
android:layout_marginTop="100dp"
android:textAlignment="center"
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/editText"
android:inputType="text"
android:text="Firstname" />
<EditText
android:layout_marginTop="150dp"
android:textAlignment="center"
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/editTextLast"
android:inputType="text"
android:text="LastName" />
<EditText
android:layout_marginTop="200dp"
android:id="@+id/editPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword"
android:text="Password" />
<EditText
android:layout_marginTop="250dp"
android:id="@+id/editPasswordConfirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword"
android:text="Confirm Password"/>
<EditText
android:layout_marginTop="300dp"
android:id="@+id/editPhoneNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="phone"
android:text="Phone"/>
<EditText
android:layout_marginTop="350dp"
android:id="@+id/editEmailAddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textEmailAddress"
android:text="Email"/>
<EditText
android:layout_marginTop="400dp"
android:id="@+id/editAddressLine1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:text="Address Line 1" />
<EditText
android:layout_marginTop="450dp"
android:id="@+id/editAddressLine2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:text="Address Line 2" />
<EditText
android:layout_marginTop="500dp"
android:id="@+id/postcodeUser"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPostalAddress"
android:text="Postcode" />
<EditText
android:layout_marginTop="550dp"
android:id="@+id/county"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:text="County" />
<!--</RelativeLayout>-->
<!--<RelativeLayout-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="0dp"-->
<!--android:layout_below="@+id/relativeLayout1"-->
<!--android:layout_marginTop="100dp">-->
<Button
android:layout_marginTop="600dp"
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="70dp"
android:text="Add" />
<Button
android:layout_marginTop="650dp"
android:id="@+id/btnView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@+id/btnAdd"
android:text="View Data" />
</RelativeLayout>
</RelativeLayout>
</ScrollView>
答案 0 :(得分：0)
您的问题是您只为所有EditText使用一个变量，即 editText 。因此，唯一有效使用的EditText是国家/地区（因为这是分配给 editText 变量的最后一个EditText。）
要解决此问题，您需要： -
e.g。你可以： -
public class MainDatabase extends AppCompatActivity {
private static final String TAG = "MainDatabase";
DatabaseHelper mDatabaseHelper;
private Button btnAdd, btnViewData;
private EditText
editText,
editTextLast, //<<<< ADDED
editPassword, //<<<< ADDED
editPasswordConfirm, //<<<< ADDED
editPhoneNumber, //<<<< ADDED
editEmailAddress, //<<<< ADDED
editAddressLine1, //<<<< ADDED
editAddressLine2, //<<<< ADDED
postcodeUser, //<<<< ADDED
country; //<<<< ADDED
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText = findViewById(R.id.editText);
editTextLast = findViewById(R.id.editTextLast); //<<<< CHANGED
editPassword = findViewById(R.id.editPassword); //<<<< CHANGED
editPasswordConfirm = findViewById(R.id.editPasswordConfirm); //<<<< CHANGED
editPhoneNumber = findViewById(R.id.editPhoneNumber); //<<<< CHANGED
editEmailAddress = findViewById(R.id.editEmailAddress); //<<<< CHANGED
editAddressLine1 = findViewById(R.id.editAddressLine1); //<<<<CHANGED
editAddressLine2 = findViewById(R.id.editAddressLine2); //<<<< CHANGEDX
postcodeUser = findViewById(R.id.postcodeUser); //<<<< CHANGED
country = findViewById(R.id.county); //<<<< CHANGED
btnAdd = findViewById(R.id.btnAdd);
btnViewData = findViewById(R.id.btnView);
mDatabaseHelper = new DatabaseHelper(this);
btnAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String newEntry = editText.getText().toString();
String newName = editTextLast.getText().toString(); //<<<< CHANGED
Integer newPass = Integer.parseInt(editPassword.getText().toString()); //<<<< CHANGED
String newPhone = editPhoneNumber.getText().toString(); //<<<< CHANGED
String newEmail = editEmailAddress.getText().toString(); //<<<< CHANGED
String newAdd1 = editAddressLine1.getText().toString(); //<<<< CHANGED
String newAdd2 = editAddressLine2.getText().toString(); //<<<< CHANGED
String newPC = postcodeUser.getText().toString(); //<<<< CHANGED
String newCounty = country.getText().toString(); //<<<< CHANGED
if (editText.length() != 0) {
AddData(newEntry, newName, newPass, newPhone, newEmail, newAdd1, newAdd2, newPC, newCounty);
editText.setText("");
} else {
toastMessage("You must put something in the text field!");
}
}
});
btnViewData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainDatabase.this, ListDataActivity.class);
startActivity(intent);
}
});
}
public void AddData(String newEntry, String newName, Integer newPass, String newPhone, String newEmail, String newAdd1, String newAdd2, String newPC, String newCounty) {
boolean insertData = mDatabaseHelper.addData(newEntry,newName,newPass,newPhone,newEmail,newAdd1,newAdd2,newPC,newCounty);
if (insertData) {
toastMessage("Data Successfully Inserted!");
} else {
toastMessage("Something went wrong");
}
}
/**
* customizable toast
* @param message
*/
private void toastMessage(String message){
Toast.makeText(this,message, Toast.LENGTH_SHORT).show();
}
}
注意以上是原则上的代码，尚未经过测试。因此，它可能包含一些错误。