Question

我创建了与android数据库相关的预测。

它仅适用于GENYMOTION模拟器。但是当我在移动设备上安装它时

android版本是5.0所以它显示错误是“0请求，大小为0”。它也不适用于android emultor。

它只适用于genymotion模拟器。

 login.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {

        usernamee=user.getText().toString();
        userpass=pasword.getText().toString();
        DatabaseOperations DOP=new DatabaseOperations(CTX);
        Cursor CR=DOP.getInformation(DOP);
        CR.moveToFirst();
        boolean loginstatus=false;
        String NAME="";

        if(user.getText().toString().trim().length()==0||
                   pasword.getText().toString().trim().length()==0)
        {
            Toast.makeText(getBaseContext(), "Fields are empty Please enter

       user name and password", Toast.LENGTH_LONG).show();       
        }
        else{

        try{
        do{

            if(usernamee.equals(CR.getString(0))&& 

           (userpass.equals(CR.getString(1))))  
            {


                loginstatus=true;
                NAME=CR.getString(0);
            }


        }
        while(CR.moveToNext());


        if(loginstatus)
        {
            Toast.makeText(getBaseContext(), "Log in Successed", 
              Toast.LENGTH_LONG).show();
        }
        }
        catch(Exception e)
        {
            Toast.makeText(getBaseContext(), e.getMessage(), 
         Toast.LENGTH_LONG).show();
        }
        else

        {
            Toast.makeText(getBaseContext(), "Log in failed invalid user 
         name OR password or no record found", Toast.LENGTH_LONG).show();               
        }


        }
        }

当我点击上面的登录按钮时，它只适用于genymotion模拟器。但是当我在安装了应用程序的移动设备中按下此登录按钮时。它不起作用显示错误是索引0请求大小为0。并在Android模拟器上也显示此错误。

日志猫是

      08-29 13:29:35.978: I/Choreographer(1339): Skipped 93 frames!  The 
      application may be doing too much work on its main thread. 
      08-29 13:29:36.956: I/Choreographer(1339): Skipped 43 frames!  The 
     application may be doing too much work on its main thread.
     08-29 13:29:37.498: I/Choreographer(1339): Skipped 43 frames!  The  
     application may be doing too much work on its main thread.
      08-29 13:29:53.498: D/InputEventConsistencyVerifier(1339): KeyEvent:
     ACTION_UP but key was not down.
     08-29 13:29:53.498: D/InputEventConsistencyVerifier(1339):   in 
    android.widget.EditText{4178dba0 VFED..CL .F....I. 0,127-320,167  
     #7f080009 app:id/register_paswd}
   08-29 13:29:53.498: D/InputEventConsistencyVerifier(1339):   in   
   android.widget.EditText{4178dba0 VFED..CL .F....I. 0,127-320,167 
  #7f080009 app:id/register_paswd}
    08-29 13:29:53.498: D/InputEventConsistencyVerifier(1339):   0: sent at   
  17891468000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB,    
  scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=17891468, 
    downTime=17891295, deviceId=0, source=0x101 }
     08-29 13:29:53.498: D/InputEventConsistencyVerifier(1339):   0: sent at    
    17891468000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, 
    scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=17891468, 
  downTime=17891295, deviceId=0, source=0x101 }
   08-29 13:29:59.698: W/dalvikvm(1339): threadid=1: thread exiting with 
  uncaught exception (group=0x414c4700)


 08-29 13:29:59.718: E/AndroidRuntime(1339): FATAL EXCEPTION: main


 08-29 13:29:59.718: E/AndroidRuntime(1339): 

 android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a 

  size of 0


 08-29 13:29:59.718: E/AndroidRuntime(1339):    at 

 android.database.AbstractCursor.checkPosition(AbstractCursor.java:424)


 08-29 13:29:59.718: E/AndroidRuntime(1339

  08-29 13:29:59.718:

ndowedCursor.java:50） 08-29 13：29：59.718：E / AndroidRuntime（1339）：at com.example.student_record.Setting $ 2.onClick（Setting.java:149） 08-29 13：29：59.718：E / AndroidRuntime（1339）：在android.view.View.performClick（View.java:4240） 08-29 13：29：59.718：E / AndroidRuntime（1339）：在android.view.View $ PerformClick.run（View.java:17721） 08-29 13：29：59.718：E / AndroidRuntime（1339）：在android.os.Handler.handleCallback（Handler.java:730） 08-29 13：29：59.718：E / AndroidRuntime（1339）：在android.os.Handler.dispatchMessage（Handler.java:92） 08-29 13：29：59.718：E / AndroidRuntime（1339）：在android.os.Looper.loop（Looper.java:137） 08-29 13：29：59.718：E / AndroidRuntime（1339）：在android.app.ActivityThread.main（ActivityThread.java:5103） 08-29 13：29：59.718：E / AndroidRuntime（1339）：at java.lang.reflect.Method.invokeNative（Native Method）

   08-29 13:29:59.718: E/AndroidRuntime(1339):  at 

   java.lang.reflect.Method.invoke(Method.java:525)

   08-29 13:29:59.718: E/AndroidRuntime(1339):  at

com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:737）

   08-29 13:29:59.718: E/AndroidRuntime(1339):  at 
  com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)

 08-29 13:29:59.718: E/AndroidRuntime(1339):    at     
 dalvik.system.NativeStart.main(Native Method)

Answer 1

当你调用.moveToFirst（）时，你的光标没有报告任何数据并且崩溃。在尝试使用游标之前，您应该检查它是否为null。

应用程序在设备上不起作用，但在genymotion模拟器上工作

1 个答案: