Question

这个问题的标题含糊不清，因为我真的不知道发生了什么。我在名为SummerJobFragment.java的类中有一个列表视图，这个列表视图有一个onItemClicked()假设要打开，其他片段叫SummerJobDetailsFragment.java。下面我发布了代码和logcat截图。

SummerJobFragment.java

public class SummerJobsFragmnet extends Fragment {

public SummerJobsFragmnet() {
    // Required empty public constructor
}

// TODO: Rename and change types and number of parameters
public static Fragment getInstance() {
    Fragment fragment = new SummerJobsFragmnet();
    return fragment;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

}
public void showMessage (String title, String message) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    final MainActivity activity = (MainActivity) getActivity();
    String [] places = activity.getAllPositionsNamesPhone().toArray(
            new String[activity.getAllPositionsNamesPhone().size()]);

    final ListView list = (ListView) getView().findViewById(R.id.joblistView);
    int  prgmImages=R.mipmap.ic_launcher;
    list.setAdapter(new CustomListAdapter(activity,places,prgmImages));
    // OnClick listner for the individual cells of the listView
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

            SummerJobDetailsFragment.mMyAppsBundle.putInt("value", position);
            SummerJobDetailsFragment fragment = new SummerJobDetailsFragment();
            FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction().replace(R.layout.displayjobs_detailed, fragment).commit();


        }
    });
}

SummerJobDetailsFragment.java

public class SummerJobDetailsFragment extends Fragment {

    DataBaseHelper summerJobDB;
    public static Bundle mMyAppsBundle = new Bundle();
    public int position = SummerJobDetailsFragment.mMyAppsBundle.getInt("value");


    public SummerJobDetailsFragment() {
        // Required empty public constructor
    }

    public static Fragment getInstance() {
        Fragment fragment = new SummerJobsFragmnet();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }
    @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.displayjobs_detailed,container,false);
        super.onViewCreated(view, savedInstanceState);
        SummerJobDetailsFragment summer = new SummerJobDetailsFragment();
        DataBaseHelper summerJobDB;
        summerJobDB = new DataBaseHelper(getActivity());

        Cursor res = summerJobDB.getAllData(position+1);
        EditText jobPlace = (EditText)view.findViewById(R.id.jobTitle);
        jobPlace.setText(res.getString(1));
        /*
        EditText jobPlace = (EditText)summer.getView().findViewById(R.id.jobTitle);
        jobPlace.setText(res.getString(1));
        EditText jobPosition = (EditText)summer.getView().findViewById(R.id.jobPlace);
        jobPlace.setText(res.getString(2));
        EditText starTime = (EditText)summer.getView().findViewById(R.id.jobStartingTime);
        jobPlace.setText(res.getString(3));
        EditText address = (EditText)summer.getView().findViewById(R.id.jobAddress);
        jobPlace.setText(res.getString(5));
        EditText phone = (EditText)summer.getView().findViewById(R.id.jobPhoneNum);
        jobPlace.setText(res.getString(6));
        EditText hours = (EditText)summer.getView().findViewById(R.id.jobHours);
        jobPlace.setText(res.getString(4));
        */
        return 

    }

}

这是displayjobs_detail.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/LinearLayout">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/jobplace"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobPlace"
        android:layout_gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Job Title"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobTitle"
        android:layout_gravity="right" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Job Address:"
        android:id="@+id/jobAddress" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobAddress" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Phone number:"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobPhoneNum"
        android:layout_gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Hours"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobHours" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Starting Time"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobStartingTime" />

</LinearLayout>

这里是logcat：

Answer 1

在片段的onCreateView中初始化视图项而不是onCreate

 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.your_layout, container, false);
    // Initialize Here
    return view;
}

Answer 2

首先你要在onCreate中进行布局操作，你应该在onCreateView（）中这样做：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

View rootView = inflater.inflate(R.layout.fragment_songs, container, false);


EditText jobPlace = (EditText)rootView.findViewById(R.id.jobTitle);
        jobPlace.setText(res.getString(1));

...
...
}

同时删除此声明

SummerJobDetailsFragment summer = new SummerJobDetailsFragment();

没有任何意义，你在rootView上调用findViewById。

不，这就是你的做法，

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/displayjobs_detailed"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/LinearLayout">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/jobplace"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobPlace"
        android:layout_gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Job Title"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobTitle"
        android:layout_gravity="right" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Job Address:"
        android:id="@+id/jobAddress" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobAddress" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Phone number:"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobPhoneNum"
        android:layout_gravity="center_horizontal" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Hours"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobHours" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Starting Time"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/jobStartingTime" />

</LinearLayout>
</FrameLayout>

然后在你的片段中使用它来提交

fragmentManager.beginTransaction().replace(R.id.displayjobs_detailed, fragment).commit();  // Note R.id instead of R.layout

Answer 3

你错了。 Difference between onCreateView and onViewCreated in Fragment

secondView.addSubview(btnPlay)
secondView.bringSubviewToFront(btnPlay)

而不是，打电话

 @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {

片段内的EditText崩溃应用程序崩溃

3 个答案: