安卓 1.6 &片段&标签主机 [英] Android 1.6 & Fragment & Tabhost

问题描述

我正在升级一个 Android 应用程序(1.6 兼容性)，该应用程序使用 TabHost 来显示带有嵌套活动的 3 个不同选项卡.

当时我使用 ActivityGroup 技巧在选项卡中显示嵌套活动，但我对这种方法非常不满意，因为处理某些功能真的很痛苦.

我听说过用于 1.6 的 Fragments API 兼容包，并且 Fragment 看起来非常适合我想要做的事情(在带有过渡效果和内容的选项卡中显示嵌套视图/功能)，但我不能t 让它与 TabHost 一起工作(它本来是与 Action Bar 一起工作的，但它在兼容包中不可用).

你们中有人找到了在应用程序中创建这种结构的方法吗?

我的错误是:

<块引用>

ERROR/AndroidRuntime(955): 引起:java.lang.RuntimeException: Unable

开始活动组件信息{com.XXX}:java.lang.IllegalArgumentException: 否找到 id 0x1020011 的视图片段我的片段

代码

ma​​in.xml

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"android:id="@android:id/tabhost"android:layout_width="fill_parent"android:layout_height="fill_parent"><线性布局机器人:方向=垂直"android:layout_width="fill_parent"android:layout_height="fill_parent"><框架布局android:id="@android:id/tabcontent"android:layout_width="fill_parent"android:layout_height="wrap_content"机器人:填充=5dp"android:layout_weight="1"/><TabWidgetandroid:id="@android:id/标签"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="0"/></LinearLayout></TabHost>

MainActivity.java

public class MainActivity extends TabActivity {@覆盖public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);资源 res = getResources();最终 TabHost 选项卡 = getTabHost();TabHost.TabSpec 规范；意图我；i = new Intent(this, MyActivity.class);spec = tabs.newTabSpec("MyActivity").setIndicator("MyActivity",res.getDrawable(R.drawable.tab)).setContent(i);tabs.addTab(spec);}}

MyActivity.class

public class MyActivity extends FragmentActivity {私有静态字符串标记 = "MyActivity";私有静态 FragmentManager fragmentManager；@覆盖protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();ListeResultatFragment fragment = MyFragment.newInstance();fragmentTransaction.add(android.R.id.tabcontent, fragment, "MyFragment");fragmentTransaction.commit();}}

MyFragment.java

public class MyFragment extends Fragment {公共静态 MyFragment newInstance() {MyFragment 实例 = new MyFragment();返回实例；}@覆盖公共视图 onCreateView(LayoutInflater inflater，ViewGroup 容器，Bundle savedInstanceState) {返回 inflater.inflate(R.layout.fragment, container, false);}}

解决方案

问题是您的 MyActivity 试图通过使用 来访问封闭的 MainActivityandroid.R.id.tabcontent 作为容器 id.这不可能.相反，MyActivity 需要有自己的布局(例如 FrameLayout)，可以用作 Fragment 的父级.在这个布局中，必须存在一个可以被id引用的视图.

假设您有一个名为 activity_layout.xml 的布局，其中包含一个 ID 为framelayout"的 FrameLayout.然后，您可以将 MyActivity 中的 onCreate 方法修改为如下所示:

@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);View parent = getLayoutInflater().inflate(R.layout.activity_layout, null);设置内容视图(父)；fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();片段片段 = MyFragment.newInstance();fragmentTransaction.add(R.id.framelayout, fragment, "MyFragment");fragmentTransaction.commit();}

换句话说，MyActivity 需要能够独立工作.尝试先使其工作，然后将 MyActivity 嵌入包含 TabHost 的 MainActivity 中.

I'm working on upgrading an Android application (1.6 compatibility) which uses a TabHost to show 3 different tabs with nested activities.

At the time I used the ActivityGroup trick to show nested activities in a tab but I'm very unhappy with this method since it's a real pain to handle some features.

I heard about the Fragments API compatibility package for 1.6 and a Fragment looks perfect for what I want to do (show nested views / features within a tab with transition effects and stuff) but I can't make it work with a TabHost (It was meant to work with an Action Bar but it's not available in the compatibility package).

Did any of you guys found a way to create such a structure in your applications?

My error here is :

ERROR/AndroidRuntime(955): Caused by: java.lang.RuntimeException: Unable

to start activity ComponentInfo{com.XXX}: java.lang.IllegalArgumentException: No view found for id 0x1020011 for fragment MyFragment

CODE

main.xml

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

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

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_weight="1" />

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0" />

    </LinearLayout>

</TabHost>

MainActivity.java

public class MainActivity extends TabActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        Resources res = getResources();
        final TabHost tabs = getTabHost(); 
        TabHost.TabSpec spec;
        Intent i;

        i = new Intent(this, MyActivity.class);
        spec = tabs.newTabSpec("MyActivity").setIndicator("MyActivity",res.getDrawable(R.drawable.tab)).setContent(i);
        tabs.addTab(spec);

    }

}

MyActivity.class

public class MyActivity extends FragmentActivity {

    private static String TAG = "MyActivity";
    private static FragmentManager fragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        fragmentManager = getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        ListeResultatFragment fragment = MyFragment.newInstance();
        fragmentTransaction.add(android.R.id.tabcontent, fragment, "MyFragment");
        fragmentTransaction.commit();

    }

}

MyFragment.java

public class MyFragment extends Fragment {

    public static MyFragment newInstance() {
        MyFragment instance = new MyFragment();
        return instance;
    }

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

}

解决方案

The problem is that your MyActivity tries to reach out to the enclosing MainActivity by using android.R.id.tabcontent as a container id. This is not possible. Instead, MyActivity needs to have its own layout (e.g. a FrameLayout) which can be used as the parent for the Fragment. In this layout, there must exist a view that can be referenced by id.

Let's say you have a layout called activity_layout.xml which contains a FrameLayout with the id 'framelayout'. You can then modify the onCreate method in MyActivity to something like this:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    View parent = getLayoutInflater().inflate(R.layout.activity_layout, null);
    setContentView(parent);

    fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    Fragment fragment = MyFragment.newInstance();
    fragmentTransaction.add(R.id.framelayout, fragment, "MyFragment");
    fragmentTransaction.commit();
}

In other words, MyActivity needs to be able to work on its own. Try to make it work first, and then embed MyActivity in the MainActivity containing the TabHost.

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