我有一個sqlite數據庫，我插入一行，但它會顯示forceclose

Question

此代碼containg sqlite數據庫中，我havae一個inser按鈕和刪除按鈕，當我們點擊插入按鈕，我想在我的表中插入一行代碼沒有任何錯誤不是它顯示錯誤，但在模擬器中它會顯示強制關閉錯誤

package com.android.sample;

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 android.util.Log; 

public class DBAdapter 
{ 
    public static final String KEY_ROWID = "_id"; 
    public static final String KEY_NAME = "name"; 
// public static final String KEY_FNAME = "fname"; 
// public static final String KEY_PID = "pid"; 
// public static final String KEY_SEX = "sex"; 
// 
    private static final String TAG = "DBAdapter"; 

    private static final String DATABASE_NAME = "sqldb"; 
    private static final String DATABASE_TABLE = "Mytable"; 
    private static final int DATABASE_VERSION = 1; 

    private static final String DATABASE_CREATE = 
     "create table Mytable (_id integer primary key autoincrement, "+ "name text not null);"; 

    private final Context context; 

    private DatabaseHelper DBHelper; 
    private SQLiteDatabase db; 

    public DBAdapter(Context ctx) 
    { 
     this.context = ctx; 
     DBHelper = new DatabaseHelper(context); 
    } 

    private static class DatabaseHelper extends SQLiteOpenHelper 
    { 
     DatabaseHelper(Context context) 
     { 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) 
     { 
      db.execSQL(DATABASE_CREATE); 
     } 

     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, 
     int newVersion) 
     { 
      Log.w(TAG, "Upgrading database from version " + oldVersion 
        + " to " 
        + newVersion + ", which will destroy all old data"); 
      db.execSQL("DROP TABLE IF EXISTS titles"); 
      onCreate(db); 
     } 
    }  

    //---opens the database--- 
    public DBAdapter open() throws SQLException 
    { 
     db = DBHelper.getWritableDatabase(); 
     return this; 
    } 

    //---closes the database---  
    public void close() 
    { 
     DBHelper.close(); 
    } 

    //---insert a title into the database--- 
    public long insertTitle(String name) 
    { 
     ContentValues initialValues = new ContentValues(); 
     // initialValues.put(KEY_ROWID, _id); 
     initialValues.put(KEY_NAME, name); 
//  initialValues.put(KEY_FNAME, fname); 
//  initialValues.put(KEY_PID,pid); 
//  initialValues.put(KEY_SEX,sex); 
//   
     return db.insert(DATABASE_TABLE, null, initialValues); 
    } 

    //---deletes a particular title--- 
    public boolean deleteTitle(long rowId) 
    { 
     return db.delete(DATABASE_TABLE, KEY_ROWID + 
       "=" + rowId, null) > 0; 
    } 






    public Cursor getAllTitles() 
    { 
     return db.query(DATABASE_TABLE, new String[] { 
       KEY_ROWID, 
       KEY_NAME, 
       }, 
       null, 
       null, 
       null, 
       null, 
       null); 
    } 

    //---retrieves a particular title--- 
    public Cursor getTitle(long rowId) throws SQLException 
    { 
     Cursor mCursor = 
       db.query(true, DATABASE_TABLE, new String[] { 
         KEY_ROWID, 
         KEY_NAME, 
        }, 
         KEY_ROWID + "=" + rowId, 
         null, 
         null, 
         null, 
         null, 
         null); 
     if (mCursor != null) { 
      mCursor.moveToFirst(); 
     } 
     return mCursor; 
    } 

    //---updates a title--- 
    public boolean updateTitle(long _id, String name, 
    String fname, String pid,String sex) 
    { 
     ContentValues args = new ContentValues(); 
     args.put(KEY_ROWID, _id); 
     args.put(KEY_NAME, name); 

     return db.update(DATABASE_TABLE, args, 
         KEY_ROWID , null) > 0; 
    } 
} 

SQlit data example 


package com.android.sample; 

import android.app.Activity; 
import android.content.Intent; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.TextView; 

public class sqlieDataExample extends Activity { 
    Button insert_but,cancle_but,retrive_but; 
    String str; 
    TextView tv; 
    DBAdapter db; 

    public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.sqliteexample); 
      Intent in=getIntent(); 
      Bundle b=in.getExtras(); 
      if(b!=null) 
      { 
       str=b.getString("mudata"); 
      } 
      db=new DBAdapter(getApplicationContext()); 
      db.open(); 
      insert_but=(Button)findViewById(R.id.insert_but); 
      cancle_but=(Button)findViewById(R.id.cancle_but); 
      retrive_but=(Button)findViewById(R.id.retrive_but); 
      tv=(TextView)findViewById(R.id.textView1); 
      tv.setText(str); 

      insert_but.setOnClickListener(new OnClickListener(){ 

       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 
       db.insertTitle(str); 


       }}); 
      cancle_but.setOnClickListener(new OnClickListener(){ 

       @Override 
       public void onClick(View v) { 
        //db.deleteTitle(2); 
        Intent in=new Intent(getApplicationContext(),contactssample.class); 
        startActivity(in); 
        // TODO Auto-generated method stub 
        //finish(); 

       }}); 
      retrive_but.setOnClickListener(new OnClickListener(){ 

       @Override 
       public void onClick(View v) { 
        // TODO Auto-generated method stub 
        Cursor cr=db.getAllTitles(); 
        cr.moveToFirst(); 
        do 
        { 
         System.out.println("vinod "+cr.getString(1)); 
        }while(cr.moveToNext()); 


       }}); 

} 
} 

Answer 1

強似應用程序上下文

db=new DBAdapter(getApplicationContext()); 

嘗試

db=new DBAdapter(sqlieDataExample.this); 

Answer 2

db.insertTitle(str);前檢查的str值，可能是其空或NULL。