我是新手Android
。我无法将数据插入我的数据库。虽然它通过 editText 字段接受文本,但它没有保存在数据库中。
XML
我想使用按钮的android:onClick
属性将数据插入数据库表。
当我点击我的保存按钮时,我的应用程序立即崩溃
//面试活动.java
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
import android.widget.RemoteViews.ActionException;
import android.widget.Toast;
import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
public class InterviewActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcomeactivity);
}
public void onQuestionClicked(View view) {
EditText Q = (EditText)findViewById(R.id.Questiont);
EditText A = (EditText)findViewById(R.id.Answert);
Q.setVisibility(View.VISIBLE);
A.setVisibility(View.INVISIBLE);
Toast.makeText(this, "Enter your Question here", Toast.LENGTH_LONG).show();
}
public void onAnswerClicked(View view) {
EditText Q = (EditText)findViewById(R.id.Questiont);
EditText A = (EditText)findViewById(R.id.Answert);
A.setVisibility(View.VISIBLE);
Q.setVisibility(View.INVISIBLE);
Toast.makeText(this, "Enter your Answer here", Toast.LENGTH_LONG).show();
}
public void onSave(View view) {
EditText Q = (EditText)findViewById(R.id.Questiont);
EditText A = (EditText)findViewById(R.id.Answert);
String q = Q.getText().toString();
String a = A.getText().toString();
Toast.makeText(this,"Question :"+" " + q + "\n" +
"Answer :"+" " + a, Toast.LENGTH_LONG).show();
}
public void onCancel(View view) {
finish();
}
}
//trying.java
package com.ques.ans;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class trying extends SQLiteOpenHelper{
public static final String DB_NAME = "save.db";
public static final int DB_VERSION=2;
public static final String TABLE="qnadb";
public static final String SNO = "Sno";
public static final String QUESTION = "Question";
public static final String ANSWER = "Answer";
public trying(Context context) {
super(context,DB_NAME, null, DB_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "create table TABLE (SNO integer autoincrement primary key not null, QUESTION text , ANSWER text);";
// TODO Auto-generated method stub
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE);
onCreate(db);
}
public void onsaving(String q,String a) {
SQLiteDatabase db=this.getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(SNO, 1);
cv.put(QUESTION, q);
cv.put(ANSWER, a);
db.insert(TABLE,null, cv);
db.close();
}
}