我是新的android工作室。我試圖創建SQLite數據庫,但當我嘗試插入數據android studio無法解決它。我也試過MainActivity.this和getApplicationContext而不是db=new DatabaseHelper(this);
這一行。和設備顯示器上,它不是建立一個數據庫文件我不能調用我的構造函數方法SQLite
MainActivity.java
package com.example.lenovo.sqlite_2_deneme;
import android.content.Context;
import android.media.midi.MidiDevice;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
DatabaseHelper db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db=new DatabaseHelper(this);
EditText et_name,et_surname,et_number;
Button btn_data;
et_name= (EditText) findViewById(R.id.et_isim);
et_surname= (EditText) findViewById(R.id.et_soyisim);
et_number= (EditText) findViewById(R.id.et_numara);
btn_data= (Button) findViewById(R.id.btn_veri);
btn_data.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
db.insertData();
}
});
}
}
和我DatabaseHelper類
package com.example.lenovo.sqlite_2_deneme;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.provider.ContactsContract;
import android.widget.TableLayout;
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME= "student_info.db";
public static final String TABLE_NAME="student_table";
public static final String COL_1="ID";
public static final String COL_2="NAME";
public static final String COL_3="SURNAME";
public static final String COL_4="NUMBER";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE"+ TABLE_NAME+"(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, SURNAME TEXT, NUMBER INTEGER)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+ TABLE_NAME);
this.onCreate(db);
}
public Boolean DataInsert(String name, String surname, String number)
{
SQLiteDatabase db=this.getWritableDatabase();
ContentValues contentValues=new ContentValues();
contentValues.put(COL_2,name);
contentValues.put(COL_3,surname);
contentValues.put(COL_4,number);
long sonuc= db.insert(TABLE_NAME,null,contentValues);
if(sonuc==-1)
return false;
else
return true;
}
}
有沒有方法名'分貝'insertData();'在你的'DatabaseHelper'裏面 – akhilesh0707