Question

我似乎无法在此logcat消息中找到崩溃的根源。我真的希望有人可以帮忙。如果不是没有后顾之忧。以下是我在应用程序崩溃之前收到的消息:(我真的很抱歉这么久）

09-11 11：34：00.889 22547-22547 / co.uk.mednet.mednet_ghana E / AndroidRuntime：FATAL EXCEPTION：main 流程：co.uk.mednet.mednet_ghana，PID：22547 java.lang.NullPointerException：尝试调用虚方法＆＃39; java.lang.String co.uk.mednet.mednet_ghana.model.User.getTitle（）＆＃39;在null对象引用上 at co.uk.mednet.mednet_ghana.fragments.PatientInofrmationFragment.onCreateView（PatientInofrmationFragment.java:76）在android.support.v4.app.Fragment.performCreateView（Fragment.java:2192）在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1299）在android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState（FragmentManager.java:1528）在android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1595）在android.support.v4.app.BackStackRecord.executeOps（BackStackRecord.java:758）在android.support.v4.app.FragmentManagerImpl.executeOps（FragmentManager.java:2363）在android.support.v4.app.FragmentManagerImpl.executeOpsTogether（FragmentManager.java:2149）在android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps（FragmentManager.java:2103）在android.support.v4.app.FragmentManagerImpl.execSingleAction（FragmentManager.java:1984）在android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss（BackStackRecord.java:626）在android.support.v4.app.FragmentPagerAdapter.finishUpdate（FragmentPagerAdapter.java:143）在android.support.v4.view.ViewPager.populate（ViewPager.java:1268）在android.support.v4.view.ViewPager.populate（ViewPager.java:1116）在android.support.v4.view.ViewPager.onMeasure（ViewPager.java:1642）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1435）在android.widget.LinearLayout.measureVertical（LinearLayout.java:721）在android.widget.LinearLayout.onMeasure（LinearLayout.java:612）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1435）在android.widget.LinearLayout.measureVertical（LinearLayout.java:721）在android.widget.LinearLayout.onMeasure（LinearLayout.java:612）在android.view.View.measure（View.java:18926）在android.support.v4.widget.DrawerLayout.onMeasure（DrawerLayout.java:1081）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.FrameLayout.onMeasure（FrameLayout.java:436）在android.support.v7.widget.ContentFrameLayout.onMeasure（ContentFrameLayout.java:139）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1435）在android.widget.LinearLayout.measureVertical（LinearLayout.java:721）在android.widget.LinearLayout.onMeasure（LinearLayout.java:612）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.FrameLayout.onMeasure（FrameLayout.java:436）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1435）在android.widget.LinearLayout.measureVertical（LinearLayout.java:721）在android.widget.LinearLayout.onMeasure（LinearLayout.java:612）在android.view.View.measure（View.java:18926）在android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5908）在android.widget.FrameLayout.onMeasure（FrameLayout.java:436）在com.android.internal.policy.impl.PhoneWindow $ DecorView.onMeasure（PhoneWindow.java:3076）在android.view.View.measure（View.java:18926）在android.view.ViewRootImpl.performMeasure（ViewRootImpl.java:2411）在android.view.ViewRootImpl.measureHierarchy（ViewRootImpl.java:1429）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1677）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1314）在androi

OnCreateView代码：

    //----------------find by view--------------
    mTextName = (TextView) view.findViewById(R.id.Patient_info_text_name_patient);
    mEditFirstname = (EditText) view.findViewById(R.id.Patient_info_editText_firstname);
    mEditLastname = (EditText) view.findViewById(R.id.Patient_info_editText_lastname);
    mTextEmail = (TextView) view.findViewById(R.id.Patient_info_text_email_patient);
    mEditEmail = (EditText) view.findViewById(R.id.Patient_info_editText_email);
    mTextPhone = (TextView) view.findViewById(R.id.Patient_info_text_phone_patient);
    mEditPhone = (EditText) view.findViewById(R.id.Patient_info_editText_phone);
    mTextNum = (TextView) view.findViewById(R.id.Patient_info_text_num_patient);
    mEditNum = (EditText) view.findViewById(R.id.Patient_info_editText_num);
    mTextHCP = (TextView) view.findViewById(R.id.Patient_info_text_hcp_patient);
    mEditHCP = (EditText) view.findViewById(R.id.Patient_info_editText_hcp);

    mEditFirstname.setVisibility(View.GONE);
    mEditLastname.setVisibility(View.GONE);
    mTextName.setText(PatientActivity.sPatient.getLastname()+" "+PatientActivity.sPatient.getFirstname());
    mEditEmail.setVisibility(View.GONE);
    mTextEmail.setText(PatientActivity.sPatient.getEmail());
    mEditPhone.setVisibility(View.GONE);
    mTextPhone.setText(Long.toString(PatientActivity.sPatient.getPhone_number()));
    mEditNum.setVisibility(View.GONE);
    mTextNum.setText(PatientActivity.sPatient.getPatient_number());
    mEditHCP.setVisibility(View.GONE);
    mTextHCP.setText(format("{0}. {1}", PatientActivity.sHCP.getTitle(), PatientActivity.sHCP.getLastname()));

    return view;
}

Answer 1

问题的根源在这里：

尝试调用虚方法'java.lang.String null对象上的co.uk.mednet.mednet_ghana.model.User.getTitle（）' 参考 at co.uk.mednet.mednet_ghana.fragments.PatientInofrmationFragment.onCreateView（PatientInofrmationFragment.java:76）在

Answer 2

异常是NullPointerException：

java.lang.NullPointerException：尝试调用虚方法＆＃39; java.lang.String co.uk.mednet.mednet_ghana.model.User.getTitle（）＆＃39;在空对象引用上

您正尝试在空实例上调用.getTitle（）方法。

此处抛出异常：

co.uk.mednet.mednet_ghana.fragments.PatientInofrmationFragment.onCreateView（PatientInofrmationFragment.java）

第76行

Answer 3

它是NullPointerException你可以在前3行读到它 -

java.lang.NullPointerException：尝试调用虚方法＆＃39; java.lang.String co.uk.mednet.mednet_ghana.model.User.getTitle（）＆＃39;在co.uk.mednet.mednet_ghana.fragments.PatientInofrmationFragment.onCreateView（PatientInofrmationFragment.java:76）的空对象引用上

在 onCreateView 方法的 PatientInofrmationFragment 中执行 User.getTitle（）时，显然会说 NullPointerException 。

现在怎么样？您可能没有创建用户类的对象。

Answer 4

似乎在PatientInofrmationFragment.onCreateView（）中，User为null，因此User.getTitle（）创建了一个异常。您可以在onCreateView（）中初始化视图，并更新onActivityCreated（）中的数据。

Answer 5

在你的崩溃中看看这一行。

co.uk.mednet.mednet_ghana.model.User.getTitle()' on a null object reference

我认为你没有初始化 用户。

检查您的初始化，或者如果您是从服务器接收的，请务必检查用户模型 非空。

无法找到此logcat消息中的问题所在

5 个答案: