所以我创建了一个我检查过的sqlite数据库表。但是每次我尝试添加数据时应用程序都会崩溃。我有另一个类似的表，以相同的方式实现，工作得很好，所以我猜测问题是在按钮的某个地方？
我的数据库课程：
package com.example.drivopro.drivopro;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "Company.db";
//My company table
public static final String TABLE_ME = "TABLE_ME";
public static final String MY_ID = "ID";
public static final String MY_NAME = "NAME";
public static final String MY_ADDRESS = "ADDRESS";
public static final String MY_ZIP = "ZIPCODE";
public static final String MY_CITY = "CITY";
public static final String MY_PHONE = "PHONE";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_ME + "(ID INTEGER PRIMARY KEY AUTOINCREMENT,NAME TEXT,ADDRESS TEXT,ZIPCODE TEXT,CITY TEXT,PHONE TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ME);
onCreate(db);
}
public boolean insertMyCompany(String name, String address, String zipcode, String city, String phone) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(MY_NAME, name);
contentValues.put(MY_ADDRESS, address);
contentValues.put(MY_ZIP, zipcode);
contentValues.put(MY_CITY, city);
contentValues.put(MY_PHONE, phone);
long result = db.insert(TABLE_ME, null, contentValues);
if (result == -1)
return false;
else
return true;
}
}
活动I＆＃39;我正在使用：
package com.example.drivopro.drivopro;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class ModifyCompanyInfo extends AppCompatActivity {
DatabaseHelper myDb;
Button btnsave;
EditText changeName, changeAddress, changeZip, changeCity, changePhone;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_modify_company_info);
btnsave = (Button)findViewById(R.id.saveComp);
changeName = (EditText)findViewById(R.id.myName);
changeAddress = (EditText)findViewById(R.id.myAddress);
changeZip = (EditText)findViewById(R.id.myZip);
changeCity = (EditText)findViewById(R.id.myCity);
changePhone = (EditText)findViewById(R.id.myPhone);
addData();
}
public void addData(){
btnsave.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean isInserted = myDb.insertMyCompany(changeName.getText().toString(),
changeAddress.getText().toString(),
changeZip.getText().toString(),
changeCity.getText().toString(),
changePhone.getText().toString());
if(isInserted)
Toast.makeText(ModifyCompanyInfo.this, "Tietoja muutettu", Toast.LENGTH_LONG).show();
else
Toast.makeText(ModifyCompanyInfo.this, "Mitään ei tapahtunut", Toast.LENGTH_LONG).show();
}
}
);
}
}
和XML：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.drivopro.drivopro.ModifyCompanyInfo">
<EditText
android:id="@+id/myName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Nimi"
android:inputType="textPersonName"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.084" />
<EditText
android:id="@+id/myAddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Osoite"
android:inputType="textPersonName"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.503"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.0"
app:layout_constraintTop_toBottomOf="@+id/myName" />
<EditText
android:id="@+id/myZip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Postinumero"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.503"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/myAddress"
android:layout_marginBottom="-1dp"
app:layout_constraintVertical_bias="0.0" />
<EditText
android:id="@+id/myCity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Kaupunki"
android:inputType="textPersonName"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="7dp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/myZip"
app:layout_constraintVertical_bias="0.0" />
<EditText
android:id="@+id/myPhone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="142dp"
android:ems="10"
android:hint="Puhelinnumero"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/myCity"
app:layout_constraintVertical_bias="0.0" />
<Button
android:id="@+id/cancelChanges"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="poistu"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintHorizontal_bias="0.75"
app:layout_constraintVertical_bias="0.691" />
<Button
android:id="@+id/saveComp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:text="Save"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.253"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.691" />
</android.support.constraint.ConstraintLayout>
任何帮助表示赞赏。提前谢谢！
答案 0 :(得分：0)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_modify_company_info);
myDb = new DatabaseHelper(this); //Intialize the database object
}