更改片段时应用程序崩溃

时间:2014-04-21 12:17:29

标签: java android android-fragments android-activity

我的代码中有这个:

public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}
public static class TheMapFrag extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_the_map, container,
                false);
        return rootView;
    }
}

现在这些应该显示2个片段。

我的onCreate有两个标签:

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

    // Set up the action bar.
    final ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    ActionBar.Tab testTab = actionBar.newTab().setText("The test");
    ActionBar.Tab chatTab = actionBar.newTab().setText("Chat");

    testTab.setTabListener(this);
    chatTab.setTabListener(this);

    actionBar.addTab(testTab);
    actionBar.addTab(chatTab);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }
}

现在一切都很完美,但是当我使用以下代码更改标签时:

@Override
    public void onTabSelected(Tab tab, FragmentTransaction arg1) {
        int position = tab.getPosition();
        switch(position){
        case 0:
            getSupportFragmentManager().beginTransaction()
            .add(R.id.container, new PlaceholderFragment()).commit();
           break;

        case 1:
                    getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new TheMapFrag()).commit();
          break;
     }
    }

第一次有效,但当我更改为case 1然后更改为case 0然后又回到case 1时,应用程序因这些错误而崩溃:

04-21 08:14:34.201: E/AndroidRuntime(2246): FATAL EXCEPTION: main
04-21 08:14:34.201: E/AndroidRuntime(2246): Process: com.gs.map, PID: 2246
04-21 08:14:34.201: E/AndroidRuntime(2246): android.view.InflateException: Binary XML file line #2: Error inflating class fragment
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at com.gs.map.MainActivity$TheMapFrag.onCreateView(MainActivity.java:90)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:446)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.os.Handler.handleCallback(Handler.java:733)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.os.Handler.dispatchMessage(Handler.java:95)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.os.Looper.loop(Looper.java:136)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.app.ActivityThread.main(ActivityThread.java:5017)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at java.lang.reflect.Method.invokeNative(Native Method)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at java.lang.reflect.Method.invoke(Method.java:515)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at dalvik.system.NativeStart.main(Native Method)
04-21 08:14:34.201: E/AndroidRuntime(2246): Caused by: java.lang.IllegalArgumentException: Binary XML file line #2: Duplicate id 0x7f060040, tag null, or parent id 0x7f06003f with another fragment for com.google.android.gms.maps.MapFragment
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.app.Activity.onCreateView(Activity.java:4791)
04-21 08:14:34.201: E/AndroidRuntime(2246):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:689)
04-21 08:14:34.201: E/AndroidRuntime(2246):     ... 18 more

当我选择case 0时,它会覆盖case 1

中显示的片段

我知道我必须以某种方式隐藏或破坏显示的片段,但作为初学者,我无法实现它。我确定我错过了一些非常小的东西。

修改 fragment_main.xml代码:

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.gs.map.MainActivity$PlaceholderFragment" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

2 个答案:

答案 0 :(得分:1)

从错误中听起来你正试图在片段vi布局文件中添加片段。

但是你不能在片段布局文件中指定片段。

因此,如果要在片段内添加片段,则必须在运行时进行。

如何吗

1)从片段布局文件中删除<fragment>标记。

2)将空白<LinearLyaout>改为<fragment>

3)在运行时在该linearlayout中添加片段。

答案 1 :(得分:1)

我认为你正在给其他片段中的片段充气。

而不是

getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new TheMapFrag()).commit();

使用

getSupportFragmentManager().beginTransaction()
                    .replace(R.id.container, new TheMapFrag()).commit();

添加和替换refer this

之间的区别