Android权限，适用于API 23，但已停止使用API​​ 21

Question

我正在使用这个请求权限使其在API 23上运行，但这会产生一个问题，即代码不希望通过API 21发送信息。

public void sendGetRequest(View v) 
{ 
    int version = Build.VERSION.SDK_INT; 
    if (version >= 23)
    { 
        if(checkAndRequestPermissions())  
        { //EXECUTE JSON 
            new GetClass(this).execute(); 
        } 
    }
    else
    {
        new GetClass(this).execute();
    }
}

如果我删除此权限，API 21将再次完美运行。

05-02 15:02:41.830 12952-13251/com.sandro.openalprsample E/Volley: [9140] NetworkDispatcher.run: Unhandled exception java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
                                                                   java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
                                                                       at libcore.net.UriCodec.encode(UriCodec.java:132)
                                                                       at java.net.URLEncoder.encode(URLEncoder.java:57)
                                                                       at com.android.volley.Request.encodeParameters(Request.java:480)
                                                                       at com.android.volley.Request.getBody(Request.java:466)
                                                                       at com.android.volley.toolbox.HurlStack.addBodyIfExists(HurlStack.java:236)
                                                                       at com.android.volley.toolbox.HurlStack.setConnectionParametersForRequest(HurlStack.java:210)
                                                                       at com.android.volley.toolbox.HurlStack.performRequest(HurlStack.java:106)
                                                                       at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:96)
                                                                       at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:112)
05-02 15:02:41.860 12952-12952/com.sandro.openalprsample E/ViewRootImpl: sendUserActionEvent() mView == null

使用API​​ 21打开时的堆栈跟踪：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"/>

<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />

权限：

module Categorizable
  def after_save
    # Get the base class. Please note, this will work on 1 level deep STI
    klass = self.type.blank? ? self.class : self.class.superclass

    siblings = klass.where(category: self.category)

    # ...
  end
end

如果需要更多信息，我可以更新。