Android 1.6&Fragment&Tabhost

Question

我正在努力升级Android应用程序(1.6兼容性),该应用程序使用a TabHost来显示3个带有嵌套活动的不同选项卡.

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.

我听说过针对1.6的Fragments API兼容包,Fragment看起来非常适合我想要做的事情(在带有过渡效果和东西的标签中显示嵌套视图/功能)但是我不能让它与它一起工作TabHost(它的意思是使用,Action Bar但在兼容包中没有.

你们有没有人找到在你的应用程序中创建这样一个结构的方法？

我的错误是:

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

启动活动ComponentInfo {com.XXX}:java.lang.IllegalArgumentException:找不到片段MyFragment的id 0x1020011的视图

码

main.xml中

<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);
    }

}

Answer 1

问题是您MyActivity试图MainActivity通过使用android.R.id.tabcontent容器ID 来联系封闭.这是不可能的.相反,MyActivity需要有自己的布局(例如FrameLayout),可以用作Fragment的父级.在此布局中,必须存在可由id引用的视图.

假设您有一个名为的布局activity_layout.xml,其中包含一个ID为"framelayout"的FrameLayout.然后,您可以将onCreate方法修改为MyActivity以下内容:

@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();
}

换句话说,MyActivity需要能够独立工作.尽量做到先工作,然后嵌入MyActivity在MainActivity包含TabHost.