Question

在片段A 中，它有listView。单击列表时，它应将数据传递给片段B 。

A.java

 B fragment2 = new B();
 FragmentManager fragmentManager = getFragmentManager();
 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
 fragmentTransaction.replace(R.id.fragment1, fragment2);
  fragmentTransaction.addToBackStack(null);
  fragmentTransaction.commit();

B.java

public class B extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
       View view = inflater.inflate(R.layout.b, container, false);
        Log.d("TAG","fragment2");
       return view;
    }
}

A.XML

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="@string/some_text"
            android:textSize="20sp" />

        <ListView
            android:id="@+id/listView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </LinearLayout>


</FrameLayout>

B.XML

<?xml version="1.0" encoding="utf-8"?>

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:fillViewport="false">

    <AbsoluteLayout
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_width="218dp"
            android:layout_height="47dp"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:text="Update Page"
            android:id="@+id/textView114"
            android:layout_x="12dp"
            android:layout_y="20dp" />

    </AbsoluteLayout>

</ScrollView>

这就是我的片段A的样子。

点击列表时。

这里有什么问题：？

Answer 1

我认为在实例化EditText字段时可能是您的问题，您最好在创建视图后声明您的项目，因此您必须覆盖方法onViewCreated并在其中声明您的声明，然后将您的数据库工作在try-catch块中，以确保它不是任何问题的原因：

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    name3 = (EditText) view.findViewById(R.id.editText9);
    date3 = (EditText) view.findViewById(R.id.editText12);
    Bundle bundle = this.getArguments();
    date = bundle.getString("date1");
    ID = bundle.getString("ID");
    RetrievePage(date, ID);
}

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

public void RetrievePage(String date, String id) {
    final String date2 = date;
    final String id2 = id;
    Log.d("m", id2);
    name3.setText("Lim ");
    date3.setText(date2);

    try {
        database = dbHelper.getWritableDatabase();
        c = database
                .rawQuery(
                        "SELECT i.Weather FROM Information i LEFT JOIN WorkForce w ON w.TInfo_id = i._id WHERE i.Name = ? AND i._id= ? ",
                        new String[] { String.valueOf("Lim"),
                                String.valueOf(id2) }, null);
        if (c != null) {
            while (c.moveToNext()) {
                Info I = new Info();
                Force WF = new Force();
                String Weather = c.getString(c
                        .getColumnIndexOrThrow(MyDatabaseHelper.Weather));

            }

        }
        c.close();
    } catch (Exception ex) {
        ex.printStackTrace();
    }

}

关于片段重叠，您必须将每个片段声明为分离的片段，而主FragmentActivity是保存片段的活动，在您的情况下，片段必须是仅包含ViewPager的空活动或FrameLayout包含片段：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/bg" >

    <android.support.v4.view.ViewPager
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/ac_pager"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.9" />

</RelativeLayout>

因此，您必须MainActivity包含两个片段FragmentA和FragmentB

参考this回答。

Answer 2

你的a.xml中的

使用以下内容：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:text="@string/app_name"
            android:textSize="20sp" />

        <ListView
            android:id="@+id/listView1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </LinearLayout>


</FrameLayout>

如何解决片段重叠？

2 个答案: