我尝试为Registration form具有 3 个字段的调查应用程序创建。有性别，年龄组，移动。我使用 Radiogroup 活动进行性别选择。我使用微调器活动进行年龄组选择。
按下注册按钮时，所有详细信息将存储在SQLite Database. 但它没有被插入。显示错误
RegistrationForm.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="446dp"
android:padding="10dp" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="@string/hello" />
<RadioGroup
android:id="@+id/Gender"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginRight="64dp"
android:layout_marginTop="15dp" >
<RadioButton
android:id="@+id/radio0"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/radioGroup1"
android:layout_centerHorizontal="true"
android:checked="true"
android:text="@string/male" />
<RadioButton
android:id="@+id/radio1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/radio0"
android:layout_below="@+id/radio0"
android:text="@string/female" />
</RadioGroup>
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_toLeftOf="@+id/Gender"
android:ems="10"
android:text="@string/gender" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/spinner1"
android:layout_alignLeft="@+id/spinner1"
android:ems="10" />
<EditText
android:id="@+id/editText3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/spinner1"
android:layout_alignLeft="@+id/spinner1"
android:ems="10" />
<EditText
android:id="@+id/editText6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner1"
android:layout_alignParentRight="true"
android:layout_below="@+id/Gender"
android:ems="10"
android:text="@string/age_category" />
<EditText
android:id="@+id/editText4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText6"
android:layout_alignTop="@+id/editText2"
android:layout_toLeftOf="@+id/Gender"
android:ems="10" />
<Spinner
android:id="@+id/spinner1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText2"
android:layout_below="@+id/editText6"
android:layout_marginTop="14dp" />
<EditText
android:id="@+id/mobile"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/spinner1"
android:layout_below="@+id/spinner1"
android:layout_marginTop="15dp"
android:ems="10"
android:hint="Mobile"
android:inputType="phone" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/mobile"
android:layout_alignParentRight="true"
android:layout_below="@+id/mobile"
android:layout_marginTop="22dp"
android:text="@string/register" />
</RelativeLayout>
</ScrollView>
MainActivity.java
这是一个用于获取所有值并将值存储到数据库的 java 类
package com.example.surveyapplication;
import android.os.Bundle;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends Activity {
Spinner spinner;
TextView selection;
RadioGroup radioGroup;
EditText editText;
Context context;
Button register;
UserAdapter user;
String[] items = { "Kids(0-18)", "Youth(18-30)", "Young(30-45)",
"OldAge(45 and above)" };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.registration_form);
radioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
editText = (EditText) findViewById(R.id.mobile);
spinner = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<String> aa = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, items);
aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(aa);
user = new UserAdapter(this);
user = user.open();
register = (Button) findViewById(R.id.button1);
register.setOnClickListener(new OnClickListener() {
String ageGroup;
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
boolean didItWork = true;
String gender = null;
String mobile;
mobile = editText.getText().toString();
Dialog d1 = new Dialog(MainActivity.this);
d1.setTitle("Sucess");
TextView tv1 = new TextView(MainActivity.this);
tv1.setText(mobile);
d1.setContentView(tv1);
d1.show();
if(radioGroup.getCheckedRadioButtonId() != -1){
int id =radioGroup.getCheckedRadioButtonId();
View radioButton = radioGroup.findViewById(id);
int radioId = radioGroup.indexOfChild(radioButton);
RadioButton btn = (RadioButton) radioGroup.getChildAt(radioId);
gender = (String) btn.getText();
Dialog d2 = new Dialog(MainActivity.this);
d2.setTitle("Sucess");
TextView tv2 = new TextView(MainActivity.this);
tv2.setText(gender);
d2.setContentView(tv2);
d2.show();
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0,
View arg1, int position, long arg3) {
ageGroup = (String) spinner.getItemAtPosition(position);
Dialog d = new Dialog(MainActivity.this);
d.setTitle("Sucess");
TextView tv = new TextView(MainActivity.this);
tv.setText(ageGroup);
d.setContentView(tv);
d.show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
user.insertEntry(gender,ageGroup,mobile);
user.close();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
DatabaseAdapter.java
这是提供数据库连接的数据库适配器
package com.example.surveyapplication;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DataBaseHelper extends SQLiteOpenHelper
{
public DataBaseHelper(Context context, String name,CursorFactory factory, int version)
{
super(context, name, factory, version);
}
@Override
public void onCreate(SQLiteDatabase db) `enter code here`
{
db.execSQL(UserAdapter.TABLE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
// Create a new one.
onCreate(db);
}
}
UserAdapter.java
this class is used to get table access
package com.example.surveyapplication;
import android.content.ContentValues;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class UserAdapter {
static final String DATABASE_NAME = "survey.db";
static final int DATABASE_VERSION = 1;
public static final int NAME_COLUMN = 1;
// TODO: Create public field for each column in your table.
// SQL Statement to create a new database.
static final String TABLE_CREATE = "create table "+"USER"+
"( " +"ID"+" integer primary key autoincrement,"+ "GENDER text,AGEGROUP text,MOBILE text); ";
// Variable to hold the database instance
public SQLiteDatabase db;
// Context of the application using the database.
private final Context context;
// Database open/upgrade helper
private DataBaseHelper dbHelper;
public UserAdapter(Context _context)
{
context = _context;
dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public UserAdapter open() throws SQLException
{
db = dbHelper.getWritableDatabase();
return this;
}
public void close()
{
db.close();
}
public SQLiteDatabase getDatabaseInstance()
{
return db;
}
public void insertEntry(String gender,String ageGroup,String mobile)
{
ContentValues newValues = new ContentValues();
// Assign values for each row.
newValues.put("GENDER", gender);
newValues.put("AGEGROUP",ageGroup);
newValues.put("MOBILE",mobile);
// Insert the row into your table
db.insert("USER", null, newValues);
///Toast.makeText(context, "Reminder Is Successfully Saved", Toast.LENGTH_LONG).show();
}
}