（1）近零語法錯誤

-3

04-24 12:15:21.671: E/AndroidRuntime(26419):java.lang.RuntimeException: Unable to start activity ComponentInfo{com.flocator/com.flocater.Friendfinderactivity}:android.database.sqlite.SQLiteException: near "null": syntax error(code 1): , while compiling: select * from null

這是我得到我每次我試圖compile..I時間誤差是一個學習的機器人，所以我不知道很多關於這個......所以誰能幫助我來解決這個問題.. 和我也得到錯誤Source not found 所以你能幫我解決這兩個問題。（1）近零語法錯誤

的代碼是在Friendfnderactivity.java

package com.flocater; 

import com.flocator.R; 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.os.Bundle; 
import android.telephony.TelephonyManager; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.Toast; 



public class Friendfinderactivity extends Activity { 
/** Called when the activity is first created. */ 
public static String deviceid = "deviceid"; 

public static String device_id = "device_id"; 
public static String user_id = "user_id"; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    DBHelper dbhelper = new DBHelper(this); 
    SQLiteDatabase db = dbhelper.getWritableDatabase(); 

    TelephonyManager tm = (TelephonyManager) this 
      .getSystemService(Context.TELEPHONY_SERVICE); 

    deviceid = tm.getDeviceId(); 

    Cursor cursor = db.rawQuery("select * from " 
      + Database.SUBSCRIBE_TABLE_NAME, null); 

    int rows = cursor.getCount(); 

    if (rows > 0) { 
     cursor.moveToFirst(); 
     user_id = cursor.getString(0); 
     device_id = cursor.getString(3); 
    } 
    db.close(); 
    if (device_id.equals(deviceid)) { 
     setContentView(R.layout.subscriber); 
    } else 
     setContentView(R.layout.subscribe); 
} 

public void subscribeUser(View v) { 
    // get access to views 
    EditText editName = (EditText) this.findViewById(R.id.editName); 
    EditText editPhone = (EditText) this.findViewById(R.id.editPhone); 
    EditText editArea = (EditText) this.findViewById(R.id.editArea); 
    EditText editCity = (EditText) this.findViewById(R.id.editCity); 

    boolean done = Database.addUser(this, editName.getText().toString(), 
      editPhone.getText().toString(), deviceid, editArea.getText() 
        .toString(), editCity.getText().toString()); 

    if(done) { 
     Toast.makeText(this, "Subscribed Successfully!", Toast.Length_Long).show(); 
     Intent intent = new Intent(this,Friendfinderactivity.class); 
     startActivity(intent); 
    } 
    else 
     Toast.makeText(this, "Sorry! Could not subscribe!",        Toast.LENGTH_LONG).show(); 
} 

public void addFriends(View v) { 
    Intent intent = new Intent(this,AddFriends.class); 
    startActivity(intent); 
} 

public void viewFriends(View v) { 
    Intent intent = new Intent(this,SeeFriends.class); 
    startActivity(intent); 
} 

}

來源

2015-04-24 akash sharma

這是什麼數據庫？光標cursor = db.rawQuery（「select * from」 + Database.SUBSCRIBE_TABLE_NAME，null）; – Amsheer

Database.SUBSCRIBE_TABLE_NAME的值是多少？ – Pooja

* select * from null *，還有什麼可能是Database.SUBSCRIBE_TABLE_NAME的值？ – Blackbelt

的錯誤是明顯的"select * from null"這是你的SQL查詢

這裏表名是空的。

你只需要添加表名。例如與

Cursor cursor = db.rawQuery("select * from " 
      + Database.SUBSCRIBE_TABLE_NAME, null);

這

Cursor cursor = db.rawQuery("select * from your_table_name", null);

替換以下行，我只是告訴你修改你的需要的誤差。

來源

2015-04-24 07:30:24 Amsheer

（1）近零語法錯誤

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