android - 以编程方式将 View 添加到 Fragment onCreateView 方法

Question

我正在使用 fragment 为 API15 构建 Android 应用。

布局是:

1. activity_page_detail.xml
2. activity_page_list.xml
3. activity_page_twopane.xml
4. fragment_page_detail.xml

Java 文件是:

1. pageDetailActivity.java
2. pageDetailFragment.java
3. pageListActivity.java
4. pageListFragment.java
5. DummyContent.java

在 activity_page_detail.xml 中:

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

在 activity_page_list.xml 中:

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

<ImageView
        android:id="@+id/logoimage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/logo" 
        android:layout_marginTop="20dp"
        android:layout_marginBottom="30dp"/>

<fragment
    android:id="@+id/page_list"
    android:name="com.application.trigger.pageListFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    tools:context=".pageListActivity"
    tools:layout="@android:layout/list_content" />

</LinearLayout>

在 activity_page_twopane.xml 中:

<LinearLayout 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:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:baselineAligned="false"
android:divider="?android:attr/dividerHorizontal"
android:orientation="horizontal"
android:showDividers="middle"
tools:context=".pageListActivity" >

<!--
This layout is a two-pane layout for the pages
master/detail flow. See res/values-large/refs.xml and
res/values-sw600dp/refs.xml for an example of layout aliases
that replace the single-pane version of the layout with
this two-pane version.

For more on layout aliases, see:
http://developer.android.com/training/multiscreen/screensizes.html#TaskUseAliasFilters
-->



<fragment
    android:id="@+id/page_list"
    android:name="com.application.trigger.pageListFragment"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1"
    tools:layout="@android:layout/list_content" />

<FrameLayout
    android:id="@+id/page_detail_container"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="3" />

</LinearLayout>

在 fragment_page_detail.xml 中:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".pageDetailFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" 
tools:ignore="contentDescription"
android:background="#000">

<TextView
    android:id="@+id/page_detail"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp"
    android:textColor="#fafafa"
    android:textIsSelectable="true"
    android:textAppearance="@android:attr/textAppearanceListItemSmall"
    />

<LinearLayout
   android:id="@+id/linear_vertical"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical"
   android:background="#7f7f7f"
   />

</LinearLayout>

Java 源代码是:

package com.application.trigger;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;


/**
 * An activity representing a list of pages. This activity
 * has different presentations for handset and tablet-size devices. On
 * handsets, the activity presents a list of items, which when touched,
 * lead to a {@link pageDetailActivity} representing
 * item details. On tablets, the activity presents the list of items and
 * item details side-by-side using two vertical panes.
 * <p>
 * The activity makes heavy use of fragments. The list of items is a
 * {@link pageListFragment} and the item details
 * (if present) is a {@link pageDetailFragment}.
 * <p>
 * This activity also implements the required
 * {@link pageListFragment.Callbacks} interface
 * to listen for item selections.
 */
public class pageListActivity extends FragmentActivity
        implements pageListFragment.Callbacks {

/**
 * Whether or not the activity is in two-pane mode, i.e. running on a tablet
 * device.
 */
private boolean mTwoPane;

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

    if (findViewById(R.id.page_detail_container) != null) {
        // The detail container view will be present only in the
        // large-screen layouts (res/values-large and
        // res/values-sw600dp). If this view is present, then the
        // activity should be in two-pane mode.
        mTwoPane = true;

        // In two-pane mode, list items should be given the
        // 'activated' state when touched.
        ((pageListFragment) getSupportFragmentManager()
                .findFragmentById(R.id.page_list))
                .setActivateOnItemClick(true);
    }

    // TODO: If exposing deep links into your app, handle intents here.
}

/**
 * Callback method from {@link pageListFragment.Callbacks}
 * indicating that the item with the given ID was selected.
 */
@Override
public void onItemSelected(String id) {
    if (mTwoPane) {
        // In two-pane mode, show the detail view in this activity by
        // adding or replacing the detail fragment using a
        // fragment transaction.
        Bundle arguments = new Bundle();
        arguments.putString(pageDetailFragment.ARG_ITEM_ID, id);
        pageDetailFragment fragment = new pageDetailFragment();
        fragment.setArguments(arguments);
        getSupportFragmentManager().beginTransaction()
                .replace(R.id.page_detail_container, fragment)
                .commit();

    } else {
        // In single-pane mode, simply start the detail activity
        // for the selected item ID.
        Intent detailIntent = new Intent(this, pageDetailActivity.class);
        detailIntent.putExtra(pageDetailFragment.ARG_ITEM_ID, id);
        startActivity(detailIntent);
    }
}
}

和

package com.application.trigger;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.application.trigger.dummy.DummyContent;

/**
 * A list fragment representing a list of pages. This fragment
 * also supports tablet devices by allowing list items to be given an
 * 'activated' state upon selection. This helps indicate which item is
 * currently being viewed in a {@link pageDetailFragment}.
 * <p>
 * Activities containing this fragment MUST implement the {@link Callbacks}
 * interface.
 */
public class pageListFragment extends ListFragment {
/**
 * The serialization (saved instance state) Bundle key representing the
 * activated item position. Only used on tablets.
 */
private static final String STATE_ACTIVATED_POSITION = "activated_position";

/**
 * The fragment's current callback object, which is notified of list item
 * clicks.
 */
private Callbacks mCallbacks = sDummyCallbacks;

/**
 * The current activated item position. Only used on tablets.
 */
private int mActivatedPosition = ListView.INVALID_POSITION;

/**
 * A callback interface that all activities containing this fragment must
 * implement. This mechanism allows activities to be notified of item
 * selections.
 */
public interface Callbacks {
    /**
     * Callback for when an item has been selected.
     */
    public void onItemSelected(String id);
}

/**
 * A dummy implementation of the {@link Callbacks} interface that does
 * nothing. Used only when this fragment is not attached to an activity.
 */
private static Callbacks sDummyCallbacks = new Callbacks() {
    @Override
    public void onItemSelected(String id) {
    }
};

/**
 * Mandatory empty constructor for the fragment manager to instantiate the
 * fragment (e.g. upon screen orientation changes).
 */
public pageListFragment() {
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // TODO: replace with a real list adapter.
    setListAdapter(new ArrayAdapter<DummyContent.DummyItem>(
            getActivity(),
            android.R.layout.simple_list_item_activated_1,
            android.R.id.text1,
            DummyContent.ITEMS));
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    // Restore the previously serialized activated item position.
    if (savedInstanceState != null
            && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
        setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
    }
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);

    // Activities containing this fragment must implement its callbacks.
    if (!(activity instanceof Callbacks)) {
        throw new IllegalStateException("Activity must implement fragment's callbacks.");
    }

    mCallbacks = (Callbacks) activity;
}

@Override
public void onDetach() {
    super.onDetach();

    // Reset the active callbacks interface to the dummy implementation.
    mCallbacks = sDummyCallbacks;
}

@Override
public void onListItemClick(ListView listView, View view, int position, long id) {
    super.onListItemClick(listView, view, position, id);

    // Notify the active callbacks interface (the activity, if the
    // fragment is attached to one) that an item has been selected.
    mCallbacks.onItemSelected(DummyContent.ITEMS.get(position).id);
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    if (mActivatedPosition != ListView.INVALID_POSITION) {
        // Serialize and persist the activated item position.
        outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
    }
}

/**
 * Turns on activate-on-click mode. When this mode is on, list items will be
 * given the 'activated' state when touched.
 */
public void setActivateOnItemClick(boolean activateOnItemClick) {
    // When setting CHOICE_MODE_SINGLE, ListView will automatically
    // give items the 'activated' state when touched.
    getListView().setChoiceMode(activateOnItemClick
            ? ListView.CHOICE_MODE_SINGLE
            : ListView.CHOICE_MODE_NONE);
}

private void setActivatedPosition(int position) {
    if (position == ListView.INVALID_POSITION) {
        getListView().setItemChecked(mActivatedPosition, false);
    } else {
        getListView().setItemChecked(position, true);
    }

    mActivatedPosition = position;
}
}

和:

    package com.application.trigger;

    import android.content.Intent;
    import android.os.Bundle;
    import android.support.v4.app.FragmentActivity;
    import android.support.v4.app.NavUtils;
    import android.view.MenuItem;
    /**
     * An activity representing a single page detail screen. This
     * activity is only used on handset devices. On tablet-size devices,
     * item details are presented side-by-side with a list of items
     * in a {@link pageListActivity}.
     * <p>
     * This activity is mostly just a 'shell' activity containing nothing
     * more than a {@link pageDetailFragment}.
     */

    public class pageDetailActivity extends FragmentActivity {

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

        // Show the Up button in the action bar.
        getActionBar().setDisplayHomeAsUpEnabled(true);

        // savedInstanceState is non-null when there is fragment state
        // saved from previous configurations of this activity
        // (e.g. when rotating the screen from portrait to landscape).
        // In this case, the fragment will automatically be re-added
        // to its container so we don't need to manually add it.
        // For more information, see the Fragments API guide at:
        //
        // http://developer.android.com/guide/components/fragments.html
        //
        if (savedInstanceState == null) {
            // Create the detail fragment and add it to the activity
            // using a fragment transaction.
            Bundle arguments = new Bundle();
            arguments.putString(pageDetailFragment.ARG_ITEM_ID,
                    getIntent().getStringExtra(pageDetailFragment.ARG_ITEM_ID));
            pageDetailFragment fragment = new pageDetailFragment();
            fragment.setArguments(arguments);
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.page_detail_container, fragment)
                    .commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                // This ID represents the Home or Up button. In the case of this
                // activity, the Up button is shown. Use NavUtils to allow users
                // to navigate up one level in the application structure. For
                // more details, see the Navigation pattern on Android Design:
                //
                // http://developer.android.com/design/patterns/navigation.html#up-vs-back
                //
                NavUtils.navigateUpTo(this, new Intent(this, pageListActivity.class));
                return true;
            }
            return super.onOptionsItemSelected(item);
        }
    }

和:

package com.application.trigger.dummy;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Helper class for providing sample content for user interfaces created by
 * Android template wizards.
 * <p>
 * TODO: Replace all uses of this class before publishing your app.
 */
public class DummyContent {
/**
 * An array of sample (dummy) items.
 */
public static List<DummyItem> ITEMS = new ArrayList<DummyItem>();

/**
 * A map of sample (dummy) items, by ID.
 */
public static Map<String, DummyItem> ITEM_MAP = new HashMap<String, DummyItem>();

static {
    // Add 3 sample items.
    addItem(new DummyItem("1", "ListItem-1"));
    addItem(new DummyItem("2", "ListItem-2"));
    addItem(new DummyItem("3", "ListItem-3"));
    addItem(new DummyItem("4", "ListItem-4"));
    addItem(new DummyItem("5", "ListItem-5"));
}

private static void addItem(DummyItem item) {
    ITEMS.add(item);
    ITEM_MAP.put(item.id, item);
}

/**
 * A dummy item representing a piece of content.
 */
public static class DummyItem {
    public String id;
    public String content;

    public DummyItem(String id, String content) {
        this.id = id;
        this.content = content;
    }

    @Override
    public String toString() {
        return content;
    }
}
}

最后与我的问题相关的代码文件是:

        package com.application.trigger;

        import java.util.ArrayList;

        import android.content.ContentValues;
        import android.content.Intent;
        import android.os.Bundle;
        import android.provider.ContactsContract;
        import android.provider.ContactsContract.CommonDataKinds.Email;
        import android.provider.ContactsContract.CommonDataKinds.Organization;
        import android.provider.ContactsContract.CommonDataKinds.Phone;
        import android.provider.ContactsContract.CommonDataKinds.Website;
        import android.provider.ContactsContract.Data;
        import android.provider.ContactsContract.Intents.Insert;
        import android.support.v4.app.Fragment;
        import android.view.LayoutInflater;
        import android.view.View;
        import android.view.ViewGroup;
        import android.view.ViewGroup.LayoutParams;
        import android.widget.ImageView;
        import android.widget.LinearLayout;
        import android.widget.TextView;

        import com.application.trigger.dummy.DummyContent;

        /**
         * A fragment representing a single page detail screen.
         * This fragment is either contained in a {@link pageListActivity}
         * in two-pane mode (on tablets) or a {@link pageDetailActivity}
         * on handsets.
         */
        public class pageDetailFragment extends Fragment {
            /**
             * The fragment argument representing the item ID that this fragment
             * represents.
             */
            public static final String ARG_ITEM_ID = "item_id";

            /**
             * The dummy content this fragment is presenting.
             */
            private DummyContent.DummyItem mItem;

            /**
             * Mandatory empty constructor for the fragment manager to instantiate the
             * fragment (e.g. upon screen orientation changes).
             */
            public pageDetailFragment() {
            }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            if (getArguments().containsKey(ARG_ITEM_ID)) {
                // Load the dummy content specified by the fragment
                // arguments. In a real-world scenario, use a Loader
                // to load content from a content provider.
                mItem = DummyContent.ITEM_MAP.get(getArguments().getString(ARG_ITEM_ID));
                getActivity().setTitle(mItem.content);
            }
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.fragment_page_detail, container, false);

            // show each product specification
            //passing data to each page

            if (mItem != null) {
                switch (Integer.parseInt(mItem.id)) {
                case 1:
                    ((TextView) rootView.findViewById(R.id.page_detail))
                    .setText("show text1");

                    final LinearLayout row1 = new LinearLayout(getActivity());
                    row1.setOrientation(LinearLayout.HORIZONTAL);
                    row1.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
                    row1.setVisibility(View.VISIBLE);

                    final TextView text1 = new TextView(getActivity());
                    text1.setText("some sample text");
                    text1.setVisibility(View.VISIBLE);

                    final ImageView image1 = new ImageView(getActivity());
                    image1.setVisibility(View.VISIBLE);
                    image1.setImageResource(R.drawable.logo);

                    row1.addView(text1);
                    row1.addView(image1);

                    //LinearLayout vertical = (LinearLayout) rootView.findViewById(R.id.linear_vertical);
                    //vertical.addView(row1);
                    ((ViewGroup)rootView).addView(row1);

                    break;
                case 2:
                    ((TextView) rootView.findViewById(R.id.page_detail))
                    .setText("show text2");

                    break;
                case 3:
                    ((TextView) rootView.findViewById(R.id.page_detail))
                    .setText("show text3");

                    break;
                case 4:
                    Intent contact = new Intent(Intent.ACTION_INSERT);
                    contact.setType(ContactsContract.Contacts.CONTENT_TYPE);

                    ArrayList<ContentValues> data = new ArrayList<ContentValues>();

                    ContentValues company = new ContentValues();
                    company.put(Data.MIMETYPE, Organization.CONTENT_ITEM_TYPE);
                    company.put(Organization.COMPANY, "company name");
                    data.add(company);

                    ContentValues mobile = new ContentValues();
                    mobile.put(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE);
                    mobile.put(Phone.NUMBER, "9898989898");
                    data.add(mobile);

                    ContentValues phone = new ContentValues();
                    phone.put(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE);
                    phone.put(Phone.TYPE, Phone.TYPE_WORK);
                    phone.put(Phone.NUMBER, "9898989898");
                    data.add(phone);

                    ContentValues email = new ContentValues();
                    email.put(Data.MIMETYPE, Email.CONTENT_ITEM_TYPE);
                    email.put(Email.TYPE, Email.TYPE_WORK);
                    email.put(Email.ADDRESS, "info@company.com");
                    data.add(email);

                    ContentValues website = new ContentValues();
                    website.put(Data.MIMETYPE, Website.CONTENT_ITEM_TYPE);
                    website.put(Website.URL, "http://company.com");     
                    data.add(website);

                    contact.putParcelableArrayListExtra(Insert.DATA, data);

                    int request_Code = 100;
                    startActivityForResult(contact, request_Code);

                    break;

                case 5:
                    ((TextView) rootView.findViewById(R.id.page_detail))
                    .setText("show text5");

                    break;
                }
            }

            return rootView;
        }
    }

问题是 如何在最后一个 java 代码(可能是在 onCreateView 方法中)以编程方式为每个 fragment 详细信息添加 View ？我在案例 1 中提到的函数中的代码退出程序并且无法运行。

这是相关的堆栈跟踪:

08-04 06:19:35.623: DEBUG/dalvikvm(1153): GC_CONCURRENT freed 84K, 3% free 9379K/9607K, paused 4ms+4ms
08-04 06:19:39.283: WARN/WindowManager(89): Failure taking screenshot for (180x300) to layer 21015
08-04 06:19:43.063: INFO/ActivityManager(89): START {cmp=com.application.trigger/.pageDetailActivity (has extras)} from pid 1153
08-04 06:19:43.074: WARN/WindowManager(89): Failure taking screenshot for (180x300) to layer 21010
08-04 06:19:43.233: DEBUG/AndroidRuntime(1153): Shutting down VM
08-04 06:19:43.233: WARN/dalvikvm(1153): threadid=1: thread exiting with uncaught exception (group=0x2ba041f8)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153): FATAL EXCEPTION: main
08-04 06:19:43.265: ERROR/AndroidRuntime(1153): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.application.trigger/com.application.trigger.pageDetailActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.os.Looper.loop(Looper.java:137)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.ActivityThread.main(ActivityThread.java:4424)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at java.lang.reflect.Method.invokeNative(Native Method)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at java.lang.reflect.Method.invoke(Method.java:511)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at dalvik.system.NativeStart.main(Native Method)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.view.ViewGroup.addViewInner(ViewGroup.java:3337)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.view.ViewGroup.addView(ViewGroup.java:3208)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.view.ViewGroup.addView(ViewGroup.java:3165)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.view.ViewGroup.addView(ViewGroup.java:3145)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at com.application.trigger.pageDetailFragment.onCreateView(pageDetailFragment.java:98)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1133)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.Activity.performStart(Activity.java:4475)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1929)
08-04 06:19:43.265: ERROR/AndroidRuntime(1153):     ... 11 more
08-04 06:19:43.293: WARN/ActivityManager(89):   Force finishing activity com.application.trigger/.pageDetailActivity
08-04 06:19:43.323: WARN/ActivityManager(89):   Force finishing activity com.application.trigger/.pageListActivity
08-04 06:19:43.633: INFO/Process(89): Sending signal. PID: 1153 SIG: 3

Answer 1

堆栈跟踪清楚地表明问题是您正在尝试将已附加到 ViewGroup(其父级)的 View 添加到另一个 VIewGroup。

一个 View 不能有两个不同的父 View ，因此会出现错误。

您可以在将 View 添加到新父 View 之前将其从其父 View 中删除，或者简单地多次扩充相同的 XML。如果您将一个 XML 扩展到一个以上，您将创建新的 View 对象，并且您可以将它们附加到不同的父级。