Question

当我点击我的注册按钮应用程序崩溃和logcat指向此

private void registerUser(final String name, final String email,
                          final String password) {

    String tag_string_req = "req_register";

    //crash occurs here
    pDialog.setMessage("please wait");
    showDialog();

    StringRequest strReq = new StringRequest(Method.POST,
            AppConfig.URL_REGISTER, new Response.Listener<String>() {

我可以用另一种方式显示进度对话框吗？

这就是logcat显示的内容

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.ProgressDialog.setMessage(java.lang.CharSequence)' on a null object reference
                                                              at com.chat.RegisterFragment.registerUser(RegisterFragment.java:132)
                                                              at com.chat.RegisterFragment.access$300(RegisterFragment.java:49)
                                                              at com.chat.RegisterFragment$2.onClick(RegisterFragment.java:106)
                                                              at android.view.View.performClick(View.java:5698)
                                                              at android.widget.TextView.performClick(TextView.java:10891)
                                                              at android.view.View$PerformClick.run(View.java:22533)
                                                              at android.os.Handler.handleCallback(Handler.java:739)
                                                              at android.os.Handler.dispatchMessage(Handler.java:95)
                                                              at android.os.Looper.loop(Looper.java:158)
                                                              at android.app.ActivityThread.main(ActivityThread.java:7230)
                                                              at java.lang.reflect.Method.invoke(Native Method)
                                                              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
                                                              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Answer 1

您的对话框为空，因此您需要在使用它之前对其进行初始化：

private void registerUser(final String name, final String email,
                      final String password) {

    String tag_string_req = "req_register";
    pDialog = new AlertDialog.Builder(getActivity());
    pDialog.setMessage("please wait");
    pDialog.show();

    StringRequest strReq = new StringRequest(Method.POST,
      AppConfig.URL_REGISTER, new Response.Listener<String>() {

应用程序崩溃调用pDialog

1 个答案: