Question

我有使用android studio从sqlite数据库获取单行的问题。当我在我的设备上运行应用程序时，它运行顺畅，但是当我键入关键字并单击搜索按钮时，应用程序强制关闭。

这是我的dbhelper文件：

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.readystatesoftware.sqliteasset.SQLiteAssetHelper;
import android.util.Log;

public class UserDbHelper extends SQLiteAssetHelper {
    private static final String DATABASE_NAME = "hunterdb.db";
    private static final int DATABASE_VERSION = 1;

    public UserDbHelper(Context context){
        super(context,DATABASE_NAME,null,DATABASE_VERSION);
        Log.e("DATABASE OPERATION", "Database created / opened...");
    }

    public Cursor getContact(String nopol, SQLiteDatabase sqLiteDatabase)
    {
        String[] projections= {UserContract.NewUserInfo.DATA_TYPE, UserContract.NewUserInfo.DATA_RANGKA, UserContract.NewUserInfo.DATA_MESIN, UserContract.NewUserInfo.DATA_BIAYA};
        String selection = UserContract.NewUserInfo.DATA_NOPOL+" LIKE ?";
        String[] selection_args={nopol};
        Cursor cursor=sqLiteDatabase.query(UserContract.NewUserInfo.TABLE_NAME,projections,selection,selection_args,null,null,null);
        return cursor;
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){

    }
}

这是我的searchcontactactivity类

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.media.MediaPlayer;
import android.widget.Toast;

import org.w3c.dom.Text;

public class SearchContantActivity extends ActionBarActivity{
    TextView Display_nopol,Display_type,Display_rangka,Display_mesin,Display_pembiayaan;
    EditText Search_name;
    UserDbHelper userDbHelper;
    SQLiteDatabase sqLiteDatabase;
    String search_name;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.caridata_layout);
        Search_name=(EditText)findViewById(R.id.search_name);
        Display_nopol=(TextView)findViewById(R.id.txtnopol);
        Display_type=(TextView)findViewById(R.id.txttype);
        Display_rangka=(TextView)findViewById(R.id.txtrangka);
        Display_mesin=(TextView)findViewById(R.id.txtmesin);
        Display_pembiayaan=(TextView)findViewById(R.id.txtbiaya);
    }

    public void SearchContant(View view){
        search_name=Search_name.getText().toString();
        userDbHelper=new UserDbHelper(getApplicationContext());
        sqLiteDatabase=userDbHelper.getReadableDatabase();
        Cursor cursor=userDbHelper.getContact(search_name, sqLiteDatabase);
        if(cursor.moveToFirst())
        {
            MediaPlayer mp = MediaPlayer.create(getApplicationContext(),R.raw.yelp);
            mp.start();
            String TYPE=cursor.getString(0);
            String RANGKA=cursor.getString(1);
            String MESIN=cursor.getString(2);
            String BIAYA=cursor.getString(3);
            Display_type.setText(TYPE);
            Display_rangka.setText(RANGKA);
            Display_mesin.setText(MESIN);
            Display_pembiayaan.setText(BIAYA);
        }else
        {
            Toast.makeText(getBaseContext(),"Data Tidak Ditemukan!!",Toast.LENGTH_LONG).show();
        }
    }
}

我用3列表制作了相同的程序，运行正常。但是，当我尝试使用超过3列的表格制作另一个时，应用程序强制关闭。谁知道问题？先谢谢，抱歉4我的英语不好!!

sqlite得到单行问题

0 个答案: