我正在尝试将 PreferenceFragment
添加到 FragmentPagerAdapter
。
我的类扩展了 FragmentActivity
,我尝试了 FragmentTransaction
,如下所示,并尝试添加到容器中,但似乎无法正常工作。 没有错误被抛出,实际上什么也没有发生。
主要 Activity :
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
activity_main.xml:
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
</android.support.v4.view.ViewPager>
我的选项菜单选择:
android.app.FragmentManager fm;
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_settings:
JJSettings settings = new JJSettings();
fm = getFragmentManager();
FragmentTransaction fragTrans = fm.beginTransaction();
// I also tried `replace()` here as well. Same 'nothing happens' result.
fragTrans.add(settings, "settings");
fragTrans.commit();
return true;
case R.id.menu_help:
menuHelp();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
我的设置 fragment
:
public class JJSettings extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
}
}
如果可能的话,我的偏好是坚持使用 Fragments
,这意味着我宁愿不扩展 PreferenceActivity
或将用户带到另一个调用 PreferenceFragment 的 Activity
,如果可能的话。我只是希望我在研究中遗漏了一些东西。
编辑
public class SectionsPagerAdapter extends FragmentPagerAdapter {
private int _count = 2;
public SectionsPagerAdapter(FragmentManager fm) { super(fm); }
@Override
public Object instantiateItem(ViewGroup container, int position) {
return super.instantiateItem(container, position);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new JJMainFragment();
case 1:
return new JJPendingFragment();
default:
return null;
}
}
public void setCount(int count) { this._count = count; }
@Override
public int getCount() { return this._count; }
@Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return getString(R.string.c_list).toUpperCase(Locale.ENGLISH);
case 1:
return getString(R.string.c_pending).toUpperCase(Locale.ENGLISH);
}
return null;
}
}
最佳答案
This answer让我找到了使用 v13 支持库的解决方案,其中包括一个使用真正的 android.app.Fragments 的 FragmentPagerAdapter,因此它可以支持 PreferenceFragment。
假设您使用 Eclipse 并使用“可滚动选项卡 + 滑动”导航运行新的应用程序向导(它为您提供 v4 寻呼机样板),以下是升级到 v13 所需进行的修改:
- 从您的 libs 文件夹中删除“android-support-v4.jar”文件
- 从 SDK_PATH\extras\android\support\v13 复制“android-support-v13.jar”;如果不存在,请使用 SDK 管理器安装或更新“Extras/Android 支持库”
然后,在 Java 文件中:
- 将 FragmentPagerAdapter 导入从 v4 更改为 v13
- 将 FragmentActivity 更改为普通 Activity
- 将对 getSupportFragmentManager 的调用更改为 getFragmentManager
- 从 android.app 而不是 android.support.v4 导入所有必要的类
- (除了:您仍然需要使用 v4 ViewPager,但它是兼容的)
我已经复制了下面修改后的源代码,并在最新的 Jellybean 上进行了验证。
主要 Activity .java:
package com.example.pagerwithpreferencesfragment;
import java.util.Locale;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.support.v13.app.FragmentPagerAdapter; // instead of v4.app...
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainActivity extends Activity { // no longer FragmentActivity
// these comments are now out-of-date; v13, not v4
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link android.support.v4.app.FragmentPagerAdapter} derivative, which
* will keep every loaded fragment in memory. If this becomes too memory
* intensive, it may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
ViewPager mViewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Create the adapter that will return a fragment for each of the three
// primary sections of the app.
mSectionsPagerAdapter = new SectionsPagerAdapter(
getFragmentManager()); // instead of getSupportFragmentMangager
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// this is just to show it compiles
if (position == 0) {
// you should really make this a public class elsewhere..
return new PreferenceFragment() {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings_preferences);
}
};
}
// getItem is called to instantiate the fragment for the given page.
// Return a DummySectionFragment (defined as a static inner class
// below) with the page number as its lone argument.
Fragment fragment = new DummySectionFragment();
Bundle args = new Bundle();
args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
return fragment;
}
@Override
public int getCount() {
// Show 3 total pages.
return 3;
}
@Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class DummySectionFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static final String ARG_SECTION_NUMBER = "section_number";
public DummySectionFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main_dummy,
container, false);
TextView dummyTextView = (TextView) rootView
.findViewById(R.id.section_label);
dummyTextView.setText(Integer.toString(getArguments().getInt(
ARG_SECTION_NUMBER)));
return rootView;
}
}
}
settings_preferences.xml:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:key="my_category_key"
android:title="My Title">
<CheckBoxPreference
android:key="pref_key"
android:title="Title"
android:summary="Summary"
android:defaultValue="false"
/>
</PreferenceCategory>
</PreferenceScreen>
关于android - 将 PreferenceFragment 添加到 FragmentPagerAdapter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15845632/