崩溃我是php开发人员,试图学习android,我试图设置一个数据库并插入一些数据。Android应用程序在getWritableDatabase()或getReadableDatabase()
我跟着一些教程,但我的应用程序卡住了,当我使用getWritableDatabase()
或getReadableDatabase()
。
以下是我创建的我的DBHelper
的代码。
package com.example.bootstart;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBHelper extends SQLiteOpenHelper {
private static final String LOGTAG = "THEDBHELPER";
private static final String DATABASE_NAME = "geolocation.db";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_LOCATIONS = "locations";
private static final String COLUMN_ID = "id";
private static final String COLUMN_welawa = "welawa";
private static final String COLUMN_lati = "latitude";
private static final String COLUMN_longi = "longitude";
private static final String TABLE_CREATE = "CREATE TABLE " + TABLE_LOCATIONS + " ("
+ COLUMN_ID + "INTEGER PRIMARY KEY AUTOINCREMENT, " + COLUMN_welawa + " TEXT, " + COLUMN_lati
+ " TEXT, " + COLUMN_longi + " TEXT)";
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(TABLE_CREATE);
Log.i(LOGTAG, "TABLE HAS BEEN CREATED");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOCATIONS);
onCreate(db);
}
}
我通过我的MainActivity类访问它。
package com.example.bootstart;
import android.os.Bundle;
import android.widget.Toast;
import android.app.Activity;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class MainActivity extends Activity {
SQLiteOpenHelper dbhelper;
SQLiteDatabase database;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toast.makeText(getApplicationContext(), "Main Activity", Toast.LENGTH_LONG).show();
dbhelper = new DBHelper(this);
//Works upto here
database = dbhelper.getReadableDatabase(); //App crashes on this line
}
}
我的模拟器在每次启动时崩溃,所以我一直在用我的手机进行测试。
我最小的SDK是8,如果它是任何帮助。
任何帮助是非常感谢的家伙。
我不知道这是你的崩溃的原因,但你的CREATE语句无效。 'id'后面没有空格,所以你的字符串将是..“.... idINTEGER PRIMARY ....”。首先解决这个问题,然后重试。 – Larry
张贴您的logcat –
@Larry,傻我。有效。谢谢larry。把它作为答案将雅? :P –