我尝试创建一个提交按钮,用于保存用户可以在其上键入的三个编辑文本的结果。但出了点问题。我只有一个活动和三个Java类,分别是SignUp,TableData和DatabaseOperations 请看这里的代码: XML:
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:text="First,Last"
android:ems="10"
android:id="@+id/txtName"
android:textSize="10dp"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/textView2"
android:layout_toEndOf="@+id/textView2" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:id="@+id/txtEmail"
android:textSize="10dp"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/textView3"
android:layout_toEndOf="@+id/textView3" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/txtFood"
android:textSize="8dp"
android:layout_alignBottom="@+id/textView"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignLeft="@+id/txtEmail"
android:layout_alignStart="@+id/txtEmail" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Favorite Restaurant"
android:id="@+id/textView"
android:textSize="10dp"
android:textColor="#ff4713ff"
android:layout_below="@+id/textView4"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:paddingLeft="10dp" />
<!--suppress AndroidDomInspection -->
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/rg1"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="McDonald's"
android:id="@+id/radioButton"
android:elegantTextHeight="false"
android:state_checked="true"
android:checked="false"
android:button="@android:drawable/btn_radio"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="10dp"
android:layout_marginTop="0dp" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Burger King"
android:id="@+id/radioButton2"
android:elegantTextHeight="false"
android:state_checked="true"
android:checked="false"
android:button="@android:drawable/btn_radio"
android:layout_alignTop="@+id/radioButton"
android:layout_toRightOf="@+id/txtFood"
android:layout_toEndOf="@+id/txtFood"
android:textSize="10dp"
android:layout_marginTop="-15dp" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Wendy's"
android:id="@+id/radioButton4"
android:elegantTextHeight="false"
android:state_checked="true"
android:checked="false"
android:button="@android:drawable/btn_radio"
android:layout_alignBaseline="@+id/radioButton3"
android:layout_alignBottom="@+id/radioButton3"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:textSize="10dp"
android:layout_marginTop="-15dp" />
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Papa John's Pizza"
android:id="@+id/radioButton5"
android:elegantTextHeight="false"
android:state_checked="true"
android:checked="false"
android:button="@android:drawable/btn_radio"
android:layout_below="@+id/radioButton4"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="10dp"
android:layout_marginTop="-15dp" />
<RadioButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Next"
android:id="@+id/radioButton3"
android:elegantTextHeight="false"
android:state_checked="true"
android:checked="false"
android:button="@android:drawable/btn_radio"
android:textSize="10dp"
android:layout_below="@+id/rg1"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="-15dp" />
</RadioGroup>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/button3"
android:textSize="10dp"
android:clickable="true"
android:enabled="true"
android:onClick="Submit"
android:layout_below="@+id/rg1"
android:layout_alignLeft="@+id/txtName"
android:layout_alignStart="@+id/txtName" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Name"
android:id="@+id/textView2"
android:textSize="10dp"
android:textColor="#ff4713ff"
android:layout_alignBaseline="@+id/txtName"
android:layout_alignBottom="@+id/txtName"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:paddingLeft="10dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Email"
android:id="@+id/textView3"
android:textSize="10dp"
android:textColor="#ff4713ff"
android:layout_alignBaseline="@+id/txtName"
android:layout_alignBottom="@+id/txtName"
android:layout_alignLeft="@+id/button8"
android:layout_alignStart="@+id/button8" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Favorite Food"
android:id="@+id/textView4"
android:textSize="10dp"
android:textColor="#ff4713ff"
android:layout_below="@+id/txtName"
android:layout_toRightOf="@+id/button3"
android:layout_toEndOf="@+id/button3" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Email Me"
android:id="@+id/checkBox"
android:checked="false"
android:layout_marginBottom="16dp"
android:layout_alignBottom="@+id/rg1"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="19dp"
android:layout_marginEnd="19dp"
android:enabled="true"
android:clickable="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Home"
android:id="@+id/button8"
android:textSize="10dp"
android:clickable="true"
android:enabled="true"
android:onClick="HomePage"
android:layout_below="@+id/rg1"
android:layout_toRightOf="@+id/txtName"
android:layout_toEndOf="@+id/txtName" />
Java代码:
package com.example.android.ch2;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.Toast;
public class SignUp extends ActionBarActivity {
EditText nameTxt,emailTxt,foodTxt;
String user_name,user_email,user_food;
Button REG;
Context ctx = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sign_up);
nameTxt = (EditText) findViewById(R.id.txtName);
emailTxt = (EditText) findViewById(R.id.txtEmail);
foodTxt = (EditText) findViewById(R.id.txtFood);
REG = (Button) findViewById(R.id.button3);
REG.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
user_name = nameTxt.getText().toString();
user_email = emailTxt.getText().toString();
user_food = foodTxt.getText().toString();
}
DatabaseOperations DB = new DatabaseOperations(ctx);
DB.putInformation(DB,user_name,user_email,user_food);
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_sign_up, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void HomePage(View v){
Intent intent=new Intent(v.getContext(),Login.class);
startActivity(intent);
}}
表Jave:
package com.example.android.ch2;
import android.provider.BaseColumns;
public class TableData {
public TableData(){
}
public static abstract class TableInfo implements BaseColumns{
public static final String USER_NAME = "user_name";
public static final String USER_EMAIL = "user_email";
public static final String USER_FOOD = "user_food";
public static final String DATABASE_NAME = "user_info";
public static final String TABLE_NAME = "reg_info";a
}
}
数据库Java
package com.example.android.ch2;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DatabaseOperations extends SQLiteOpenHelper {
public static final int database_version = 1;
public String CREATE_QUERY = "CREATE TABLE"+ TableData.TableInfo.TABLE_NAME+" ("+ TableData.TableInfo.USER_NAME+" TEXT,"+ TableData.TableInfo.USER_EMAIL+" TEXT,"+ TableData.TableInfo.USER_FOOD+" TEXT);";
public DatabaseOperations(Context context){
super(context, TableData.TableInfo.DATABASE_NAME,null,database_version);
}
@Override
public void onCreate(SQLiteDatabase sdb) {
sdb.execSQL(CREATE_QUERY);
Log.d("Database Operations", "Table created");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void putInformation (DatabaseOperations dop, String name,String email,String food){
SQLiteDatabase SQ = dop.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put(TableData.TableInfo.USER_NAME, name);
cv.put(TableData.TableInfo.USER_EMAIL, email);
cv.put(TableData.TableInfo.USER_FOOD, food);
long k = SQ.insert(TableData.TableInfo.TABLE_NAME, null, cv);
Log.d ("Database operations", "One raw inserted");
}
}
LogCat片段:
-06 22:25:41.718 4004-4004/? E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.android.ch2,
PID: 4004 android.database.sqlite.SQLiteException: near "TABLEreg_info": syntax error (code 1): , while compiling:
CREATE TABLEreg_info(user_name TEXT,user_email TEXT,user_food TEXT); at android.database.sqlite.SQLiteConnection.nativePrepareStatement
(Native Method
答案 0 :(得分:2)
您在TABLE和TableData.TableInfo.TABLE_NAME之间没有空格
使用此
public String CREATE_QUERY =&#34; CREATE TABLE&#34; + TableData.TableInfo.TABLE_NAME +&#34; (&#34; + TableData.TableInfo.USER_NAME +&#34; TEXT,&#34; + TableData.TableInfo.USER_EMAIL +&#34; TEXT,&#34; + TableData.TableInfo.USER_FOOD +&#34; TEXT);&#34 ;;
不是这个
public String CREATE_QUERY =&#34; CREATE TABLE&#34; + TableData.TableInfo.TABLE_NAME +&#34; (&#34; + TableData.TableInfo.USER_NAME +&#34; TEXT,&#34; + TableData.TableInfo.USER_EMAIL +&#34; TEXT,&#34; + TableData.TableInfo.USER_FOOD +&#34; TEXT);&#34 ;;
在字符串
中的 TABLE 后面看空格