我正在尝试使用选项卡创建 Preferencefragment 或 PreferenceActivity。实际上我做不到,我的代码很简单: 主要 Activity
public class MainActivity extends AppCompatActivity {
private ViewPagerAdapter mSectionsPagerAdapter;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPager = (ViewPager) findViewById(R.id.container);
setupViewPager(viewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new FirstFragment(), "ONE");
adapter.addFragment(new SecondFragment(), "TWO");
adapter.addFragment(new ThirdFragment(), "THREE");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
和其中一个 fragment
public class FirstFragment extends Fragment{
public FirstFragment () {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
return view;
}
}
正如你所看到的,它是空的。现在,我需要用首选项 fragment 替换 fragment 。但我不明白如何用选项卡实现它们。我该怎么做?
最佳答案
不久前,这个 would not have been possible ,由于 PreferenceFragments 与支持库不能很好地配合。借助最新版本的支持 v7 库,我们现在拥有 PreferenceFragmentCompat类,它将在 AppCompatActivity 中工作,并且也将与您的 ViewPager 和 FragmentPagerAdapter 一起工作。
由于您将支持库 fragment 与 android.support.v4.app.FragmentPagerAdapter
一起使用,因此这是当前配置的唯一选项。
请注意,可以使用具有不支持 fragment 的 TabLayout,但是您必须使用 android.support.v13.app.FragmentPagerAdapter 类,该类允许使用不支持 fragment 。
因此,为了保持当前配置并使其正常工作,请使 PreferenceFragment 扩展 PreferenceFragmentCompat:
import android.os.Bundle;
import android.support.v7.preference.PreferenceFragmentCompat;
import android.view.View;
public class MySettingsPrefFragment extends PreferenceFragmentCompat {
public MySettingsPrefFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.fragment_settings_pref);
}
@Override
public void onCreatePreferences(Bundle bundle, String s) {
}
}
添加与您的 PreferenceFragment 相对应的新选项卡:
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new FirstFragment(), "ONE");
adapter.addFragment(new SecondFragment(), "TWO");
adapter.addFragment(new ThirdFragment(), "THREE");
adapter.addFragment(new MySettingsPrefFragment(), "SETTINGS"); //added
viewPager.setAdapter(adapter);
}
而且,应该就是这样!
关于java - PreferenceFragment 与 AppCompatActivity Android,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35142878/