android - java.lang.IllegalArgumentException : No view found for 异常

Question

我正在尝试做的事情:从一个主/细节流程项目开始，我试图让用户按下 ActionMenu 中的一个项目，该项目应该显示一个可以包含新数据的 fragment 放入。

问题:当我尝试启动 fragment 时出现错误。我做错了什么？

粘贴代码后，我觉得我弄得一团糟。仍然需要帮助。

错误:

java.lang.IllegalArgumentException: No view found for id 0x7f090040 (com.example.androidtest:id/AddItem_fragment) for fragment AddItem{5b161e7 #1 id=0x7f090040}

ItemListActivity.java:

public class ItemListActivity extends ActionBarActivity implements
    ItemListFragment.Callbacks {

private boolean mTwoPane;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_item_list);

    if (findViewById(R.id.item_detail_container) != null) {
        mTwoPane = true;
        ((ItemListFragment) getSupportFragmentManager().findFragmentById(
                R.id.item_list)).setActivateOnItemClick(true);
    }


}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.activity_actions, menu);
    setTitle("Shoppinglistan");
    return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
        case R.id.action_add:
            openAddItem();
            return true;
        case R.id.action_send:
            //openSettings();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

@Override
public void onItemSelected(String id) {
    if (mTwoPane) {
        Bundle arguments = new Bundle();
        arguments.putString(ItemDetailFragment.ARG_ITEM_ID, id);
        ItemDetailFragment fragment = new ItemDetailFragment();
        fragment.setArguments(arguments);
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.item_detail_container, fragment).commit();            

    } else {
        Intent detailIntent = new Intent(this, ItemDetailActivity.class);
        detailIntent.putExtra(ItemDetailFragment.ARG_ITEM_ID, id);
        startActivity(detailIntent);
    }
}

public void openAddItem() {
    AddItem additem = new AddItem();
    getSupportFragmentManager().beginTransaction()
    .add(R.id.AddItem_fragment, additem).commit();
}

public static class AddItem extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.additem_layout,
                container, false);
        return rootView;
    }
}

activity_item_detail.xml:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/item_detail_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.androidtest.ItemDetailActivity"
tools:ignore="MergeRootFrame" >

    <fragment 
    android:name="com.example.androidtest.AddItem"
    android:id="@+id/AddItem_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp" 

    />

</FrameLayout>

additem_layout:

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

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Large Text"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

Answer 1

你的问题是这一行

public void openAddItem() {
AddItem additem = new AddItem();
getSupportFragmentManager().beginTransaction()
.add(R.id.AddItem_fragment, additem).commit();
}

这里已经有了

 <fragment 
android:name="com.example.androidtest.AddItem"
android:id="@+id/AddItem_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp" 
/>

您不能以编程方式重新创建它，您需要做的就是删除以编程方式添加的 fragment ，并且它会在那里，因为(在不同的语言中它的堆栈)..

编辑

为了解决您的评论，首先在调用 ItemDetailFragment 时向您的 fragment 添加一个标签，例如 "ItemDetailFragment" & 而不是 openAddItem 中的先前代码() 用这个替换它们

public void openAddItem() {
getSupportFragmentManager().beginTransaction().remove(getSupportFragmentManager().
       findFragmentByTag("ItemDetailFragment"));
getSupportFragmentManager().popBackStackImmediate(); // 
// if your fragment is still not showing then uncomment the below line
//getSupportFragmentManager().beginTransaction().show(getSupportFragmentManager().
     findFragmentById(the_id_of_ur_fragment));
}

希望它足够好