Java onOptionsItemSelected()方法无法使用Android片段类变量
我在活动中有一个片段,如下所示Java onOptionsItemSelected()方法无法使用Android片段类变量,java,android,android-fragments,android-actionbar,android-menu,Java,Android,Android Fragments,Android Actionbar,Android Menu,我在活动中有一个片段,如下所示 public class ViewRecordFragment extends Fragment { private Integer recordId; public ViewRecordFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,
public class ViewRecordFragment extends Fragment {
private Integer recordId;
public ViewRecordFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (recordId != null) {
new ViewRecordActivity.GetRecordToDisplay(getActivity()).execute(recordId);
loadImageResourcesAsync(recordId);
}
return inflater.inflate(R.layout.fragment_view_record, container, false);
}
public static ViewRecordFragment newInstance(Integer recordId) {
ViewRecordFragment fragment = new ViewRecordFragment();
Bundle bundle = new Bundle();
bundle.putInt(BundleHelper.RECORD_ID, recordId);
fragment.setArguments(bundle);
fragment.setRetainInstance(true);
return fragment;
}
private void loadImageResourcesAsync(Integer recordId) {
new LoadImageResourcesAsync(getActivity()).execute(recordId);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
if (getArguments() != null) {
recordId = getArguments().getInt(BundleHelper.RECORD_ID);
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
menu.clear();
inflater.inflate(R.menu.menu_view_record, menu);
//super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// handle item selection
switch (item.getItemId()) {
case R.id.action_new_photo:
//Integer recordId = getArguments().getInt(BundleHelper.RECORD_ID);
Intent intent = new Intent(getActivity(), CameraActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
Bundle bundle = new Bundle();
bundle.putInt(BundleHelper.RECORD_ID, recordId);
bundle.putString(BundleHelper.UNIQUE_IDENTIFIER, UUID.randomUUID().toString());
intent.putExtras(bundle);
getActivity().startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
活动使用此片段显示单个记录
public class ViewRecordActivity extends AppCompatActivity {
private Toolbar toolbar = null;
private Integer recordId;
private String patientNo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_record);
toolbar = (Toolbar) findViewById(R.id.header);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Record");
Bundle extras = getIntent().getExtras();
if (extras != null) {
recordId = extras.getInt(BundleHelper.RECORD_ID);
patientNo = extras.getString(BundleHelper.PATIENT_NO);
getSupportActionBar().setSubtitle("Patient Id: " + patientNo);
}
if (savedInstanceState == null) {
ViewRecordFragment viewRecordFragment = ViewRecordFragment.newInstance(recordId);
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager
.beginTransaction()
.replace(R.id.view_record_fragment, viewRecordFragment
).commit();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
this.finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public static class GetRecordToDisplay extends GetRecordAsync {
private TextView dos;
private TextView facultyName;
private TextView patientName;
private TextView patientId;
public GetRecordToDisplay(Activity activity) {
super(activity);
this.dos = (TextView) activity.findViewById(R.id.date_submitted_text);
this.facultyName = (TextView) activity.findViewById(R.id.name_text);
this.patientName = (TextView) activity.findViewById(R.id.customer_name_text);
this.patientId = (TextView) activity.findViewById(R.id.customer_id_text);
}
@Override
protected void onPostExecute(Customer customer) {
if (customer != null) {
this.dos.setText(customer.getDOS_D());
this.facultyName.setText(customer.getDOS_R());
this.patientName.setText(customer.getCUSTOMER_N());
this.patientId.setText(customer.getCUSTOMER_C());
}
}
}
当我尝试从“单击”菜单项启动新活动时,会出现此问题。单击菜单项时,我传递的记录ID
为空
我不知道我错过了什么。我可以看到,在活动内部(在调试模式下)创建片段时,会分配recordId
但是,当我单击菜单项并转到特定的菜单项案例时,
recordId
为空。但是我希望在创建片段时分配给它的recordId。您正在为片段设置参数,但没有使用它们。在片段的onCreate
方法中执行此操作:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
recordId = getArguments().getInt(BundleHelper.RECORD_ID);
}
根据您提供的代码,创建新片段实例时,您的
recordId
为null,因此您将null
传递给参数,因此它在片段中为null
。很抱歉,我没有添加oncreate方法。在那里,我可以看到这个recordId被分配,并被传递到片段中。请注意你在这里发布的代码。。您说您有一个ViewRecordFragment
,它具有onCreate
,您将其视为活动。。片段没有getIntent()
方法。。我想你在这里发布代码时错过了一些东西谢谢Gennadii,我已经添加了完整的代码,这样我就不会错过任何东西。我仍然有这个问题。是否有一种特殊的方法将变量传递给片段并保存在片段对象中?非常感谢@Gennadii,我正在newInstance()
方法中设置它。asfragment.setRecordId(recordId)代码>。我也是这样做的。但我可能错过了什么。我会再做一次,看看:)不要这样做:fragment.setRecordId(recordId)
,因为在屏幕旋转时会经常重新创建片段,每次都会丢失值。Android为这一点提供了论据。如果您设置了它们,它们总是可用的。我将其添加到代码中,但问题仍然存在,但我可以看到onCreate、onViewCreated方法在实际显示viewisrecordId
仍然为空之前执行了两次?这真的很奇怪,recordId
如果您的活动通过Intent
接收到该值,则该值不应为null
。请确保此时它不是null
:ViewRecordFragment.newInstance(recordId)代码>在调用getArguments()
时也放置一个断点,并查看该值是否存在。