我想在我的活动中创建已经扩展 ListActivity 的片段。这个片段活动甚至应该适用于 < 3.0 的 android 版本
从下面的链接中，我得到了在较低的 android 版本中实现片段的解决方案。他们告诉将主要活动扩展到 FragmentActivity。 Android 2.2.1、2.3、2.0 中的片段。这可能吗？
现在我的问题是如何将我的主 Activity 扩展到 FragmentActivity，因为它已经在扩展 ListActivity。
请帮帮我。谢谢。
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188 次
5 回答
1
不幸的是，android 支持库不包含 FragmentListActivity。您必须通过让自定义 Listactivity 扩展 FragmentActivity 来创建自己的。
我在 GitHub 上找到了这个类。也许你试一试:)
*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
/**
* <em>Copy from Android source to enable {@link Fragment} support.</em>
*
* @see ListActivity
*/
public abstract class FragmentListActivity extends FragmentActivity {
// changed to private as original suggested
private ListAdapter mAdapter;
// changed to private as original suggested
private ListView mList;
private Handler mHandler = new Handler();
private boolean mFinishedStart = false;
private Runnable mRequestFocus = new Runnable() {
public void run() {
mList.focusableViewAvailable(mList);
}
};
/**
* This method will be called when an item in the list is selected. Subclasses should override. Subclasses can call
* getListView().getItemAtPosition(position) if they need to access the data associated with the selected item.
*
* @param l
* The ListView where the click happened
* @param v
* The view that was clicked within the ListView
* @param position
* The position of the view in the list
* @param id
* The row id of the item that was clicked
*/
protected void onListItemClick(ListView l, View v, int position, long id) {
}
/**
* Ensures the list view has been created before Activity restores all of the view states.
*
* @see Activity#onRestoreInstanceState(Bundle)
*/
@Override
protected void onRestoreInstanceState(Bundle state) {
ensureList();
super.onRestoreInstanceState(state);
}
/**
* Updates the screen state (current list and other views) when the content changes.
*
* @see Activity#onContentChanged()
*/
@Override
public void onContentChanged() {
super.onContentChanged();
// changed references from com.android.internal.R to android.R.*
View emptyView = findViewById(android.R.id.empty);
mList = (ListView) findViewById(android.R.id.list);
if (mList == null) {
throw new RuntimeException(
"Your content must have a ListView whose id attribute is " +
"'android.R.id.list'");
}
if (emptyView != null) {
mList.setEmptyView(emptyView);
}
mList.setOnItemClickListener(mOnClickListener);
if (mFinishedStart) {
setListAdapter(mAdapter);
}
mHandler.post(mRequestFocus);
mFinishedStart = true;
}
/**
* Provide the cursor for the list view.
*/
public void setListAdapter(ListAdapter adapter) {
synchronized (this) {
ensureList();
mAdapter = adapter;
mList.setAdapter(adapter);
}
}
/**
* Set the currently selected list item to the specified position with the adapter's data
*
* @param position
*/
public void setSelection(int position) {
mList.setSelection(position);
}
/**
* Get the position of the currently selected list item.
*/
public int getSelectedItemPosition() {
return mList.getSelectedItemPosition();
}
/**
* Get the cursor row ID of the currently selected list item.
*/
public long getSelectedItemId() {
return mList.getSelectedItemId();
}
/**
* Get the activity's list view widget.
*/
public ListView getListView() {
ensureList();
return mList;
}
/**
* Get the ListAdapter associated with this activity's ListView.
*/
public ListAdapter getListAdapter() {
return mAdapter;
}
private void ensureList() {
if (mList != null) {
return;
}
// use legacy hack to get layout ID instead of com.android.internal.R.layout.list_*
setContentView(getSupportLayoutResourceId());
}
/**
* Support-hack to make legacy methods work.
*
* @return the layout ID used for this {@link Activity}. This must be the same you are using with
* {@link #setContentView(int)}.
*/
abstract protected int getSupportLayoutResourceId();
private AdapterView.OnItemClickListener mOnClickListener = new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
onListItemClick((ListView) parent, v, position, id);
}
};
}
于 2013-05-28T05:42:01.013 回答
0
这是转换它的逻辑。
- 按照链接Fragments in Android 2.2.1、2.3、2.0 中的说明导入库。这可能吗？
- 将您的 List Activity 划分为 FragmentActivity 和 ListFragment
- 将 ListFragment 加载到 FragmentActivity
这并不容易，因为您可能必须更改整个代码，但您可以随时通过 Google 搜索。
祝你好运^^
于 2013-05-28T05:40:40.713 回答
0
我如何将我的主要活动扩展到 FragmentActivity，因为它已经在扩展 ListActivity。
- 创建一个扩展 FragmentActivity 本身的 Activity，然后为该 Activity 中的 Fragment 扩展 ListFragment 并使用 ListActivity 中存在的相同代码来实现目标。
于 2013-05-28T05:46:15.803 回答
0
使用 android 支持库，允许您支持 Fragment 一直到 2.x 版本的 android。
于 2013-05-28T05:38:28.023 回答
0
于 2013-05-28T05:47:16.197 回答