我创建了一个应用程序,可帮助用户使用API登录到在线服务器。我使用Raturofit来帮助我对服务器进行网络呼叫。奇怪的是,当服务器的响应为null时,某些设备(例如平板电脑和蓝色堆栈)(如Blue Stacks)会得到Null指针异常。请帮助我修复空指针异常。 NB:关于Null指针异常有很多问题,但没有针对我的问题量身定制的。
这是我的代码
public void loginUser(String userName, String userPassword, Boolean userRememberMe) {
Retrofit retrofit = RetrofitClient.getClient(authUser.getToken());
APIService mAPIService = retrofit.create(APIService.class);
final ProgressDialog loading = ProgressDialog.show(this, "Please Wait", "...", false, false);
loading.show();
mAPIService.loginUser(userName, userPassword, userRememberMe).enqueue(new Callback<LendingResponse>() {
@Override
public void onResponse(Response<LendingResponse> response, Retrofit retrofit) {
if(response.isSuccess()) {
String userId = response.body().getData().getId();
String userName = response.body().getData().getUsername();
String name = response.body().getData().getName();
String phoneNumber = response.body().getData().getPhoneNumber();
String email = response.body().getData().getEmail();
String token =response.body().getData().getToken();
String gender = response.body().getData().getGender();
loading.dismiss();
}
}
@Override
public void onFailure(Throwable throwable) {
Log.e(TAG, throwable.getMessage());
Toast.makeText(LoginActivity.this, "Unable to Login", Toast.LENGTH_SHORT).show();
loading.dismiss();
}
});
}
这是我的错误登录下面的播放商店:
java.lang.NullPointerException:
at com.jonathan.lendingsquare.auth.LoginActivity$3.onResponse (Unknown Source)
at retrofit.ExecutorCallAdapterFactory$ExecutorCallback$1.run (Unknown Source)
at android.os.Handler.handleCallback (Handler.java:733)
at android.os.Handler.dispatchMessage (Handler.java:95)
at android.os.Looper.loop (Looper.java:136)
at android.app.ActivityThread.main (ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative (Native Method)
at java.lang.reflect.Method.invoke (Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:609)
at dalvik.system.NativeStart.main (Native Method)
删除进度对话框,而不是对其进行测试。
null或不
的其他明智检查boolean msuccess = false;
if (response.isSuccessful())
if (response.body() != null)
if(response.body().getStatus().getSuccess().equalsIgnoreCase(Constants.getInstance().True))
mSuccess = true;
if (mSuccess) {
//your code`enter code here`
}
只需检查值 null
还是不:
if (!(signUp_jsonObject.isNull(response.body().getData().getId())))
{
String userId = response.body().getData().getId();
}
这对我有用
if (response.isSuccessful() && response.body() != null) {
//Code here
}