Android 在PreferenceFragmentCompat内部实现PreferenceFragmentCompat
问题是如何使用其他嵌套的PreferenceFragmentCompat构建PreferenceFragmentCompat 主要活动:Android 在PreferenceFragmentCompat内部实现PreferenceFragmentCompat,android,android-fragments,android-support-library,android-preferences,Android,Android Fragments,Android Support Library,Android Preferences,问题是如何使用其他嵌套的PreferenceFragmentCompat构建PreferenceFragmentCompat 主要活动: public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getSupportFragment
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportFragmentManager()
.beginTransaction()
.replace(android.R.id.content, new PrefsFragment())
.commit();
}
预碎片:
public class PrefsFragment extends PreferenceFragmentCompat {
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.preferences, rootKey);
}
public static class GeneralPreferenceFragment extends PreferenceFragmentCompat {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
setPreferencesFromResource(R.xml.pref_general, rootKey);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
}
...
preferences.xml:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<Preference
app:fragment="com.example.playground.PrefsFragment$GeneralPreferenceFragment"
android:icon="@drawable/ic_info_black_24dp"
app:title="@string/pref_header_general"
app:key="general" />
<Preference
app:fragment="com.example.playground.PrefsFragment$NotificationPreferenceFragment"
android:icon="@drawable/ic_notifications_black_24dp"
app:title="@string/pref_header_notifications"
app:key="notifications" />
<Preference
app:fragment="com.example.playground.PrefsFragment$DataSyncPreferenceFragment"
android:icon="@drawable/ic_sync_black_24dp"
app:title="@string/pref_header_data_sync"
app:key="data_sync" />
</PreferenceScreen>
因此,当我单击任何首选项时,都不会发生任何事情,而我希望加载我的其他首选项片段。我读过,其中指出:当用户点击带有关联片段的首选项时,将调用接口方法PreferenceFragmentCompat.OnPreferenceStartFragmentCallback.onPreferenceStartFragment()。这个方法是你应该处理显示新屏幕的地方,应该在周围的活动中实现
但是我想在我的PrefsFragment内部实现处理所有底层首选项片段的所有逻辑,而不是在父活动中。
可能吗
感谢您的时间和关注。如果您愿意,可以直接从以下网址查看此代码:首先用以下方法定义根
首选项屏幕
:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:app="http://schemas.android.com/apk/res-auto">
<Preference
app:title="@string/basic_preferences"
app:summary="Sample preferences using basic attributes"
app:fragment="com.example.androidx.preference.sample.MainActivity$BasicPreferencesFragment"/>
<Preference
app:title="@string/widgets"
app:summary="Sample preferences with different widgets"
app:fragment="com.example.androidx.preference.sample.MainActivity$WidgetPreferencesFragment"/>
<Preference
app:title="@string/dialogs"
app:summary="Sample preferences that launch dialogs"
app:fragment="com.example.androidx.preference.sample.MainActivity$DialogPreferencesFragment"/>
<Preference
app:title="@string/advanced_attributes"
app:summary="Sample preferences with advanced attributes"
app:fragment="com.example.androidx.preference.sample.MainActivity$AdvancedPreferencesFragment"/>
</PreferenceScreen>
最后,例如,一个活动
扩展AppCompatActivity
,其中一些内部片段
扩展首选项FragmentCompat
:
package com.example.androidx.preference.sample
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
class MainActivity : AppCompatActivity(),
PreferenceFragmentCompat.OnPreferenceStartFragmentCallback {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
supportFragmentManager
.beginTransaction()
.replace(R.id.settings, SettingsFragment())
.commit()
supportFragmentManager.addOnBackStackChangedListener {
if (supportFragmentManager.backStackEntryCount == 0) {
setTitle(R.string.title)
}
}
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
override fun onSupportNavigateUp(): Boolean {
if (supportFragmentManager.popBackStackImmediate()) {
return true
}
return super.onSupportNavigateUp()
}
override fun onPreferenceStartFragment(
caller: PreferenceFragmentCompat,
pref: Preference
): Boolean {
// Instantiate the new Fragment
val args = pref.extras
val fragment = supportFragmentManager.fragmentFactory.instantiate(
classLoader,
pref.fragment,
args
).apply {
arguments = args
setTargetFragment(caller, 0)
}
// Replace the existing Fragment with the new Fragment
supportFragmentManager.beginTransaction()
.replace(R.id.settings, fragment)
.addToBackStack(null)
.commit()
return true
}
/**
* The root preference fragment that displays preferences that link to the other preference
* fragments below.
*/
class SettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.root, rootKey)
}
}
/**
* A preference fragment that demonstrates commonly used preference attributes.
*/
class BasicPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.basic_preferences, rootKey)
}
}
/**
* A preference fragment that demonstrates preferences which contain dynamic widgets.
*/
class WidgetPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.widgets, rootKey)
}
}
/**
* A preference fragment that demonstrates preferences that launch a dialog when tapped.
*/
class DialogPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.dialogs, rootKey)
}
}
/**
* A preference fragment that demonstrates more advanced attributes and functionality.
*/
class AdvancedPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.advanced, rootKey)
}
}
}
为什么你要在片段中添加一个片段呢?你可以在一个偏好片段中实现所有必要的逻辑,而不必这样做that@petyr在这里描述的片段中包含片段的想法
package com.example.androidx.preference.sample
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
class MainActivity : AppCompatActivity(),
PreferenceFragmentCompat.OnPreferenceStartFragmentCallback {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
supportFragmentManager
.beginTransaction()
.replace(R.id.settings, SettingsFragment())
.commit()
supportFragmentManager.addOnBackStackChangedListener {
if (supportFragmentManager.backStackEntryCount == 0) {
setTitle(R.string.title)
}
}
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
override fun onSupportNavigateUp(): Boolean {
if (supportFragmentManager.popBackStackImmediate()) {
return true
}
return super.onSupportNavigateUp()
}
override fun onPreferenceStartFragment(
caller: PreferenceFragmentCompat,
pref: Preference
): Boolean {
// Instantiate the new Fragment
val args = pref.extras
val fragment = supportFragmentManager.fragmentFactory.instantiate(
classLoader,
pref.fragment,
args
).apply {
arguments = args
setTargetFragment(caller, 0)
}
// Replace the existing Fragment with the new Fragment
supportFragmentManager.beginTransaction()
.replace(R.id.settings, fragment)
.addToBackStack(null)
.commit()
return true
}
/**
* The root preference fragment that displays preferences that link to the other preference
* fragments below.
*/
class SettingsFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.root, rootKey)
}
}
/**
* A preference fragment that demonstrates commonly used preference attributes.
*/
class BasicPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.basic_preferences, rootKey)
}
}
/**
* A preference fragment that demonstrates preferences which contain dynamic widgets.
*/
class WidgetPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.widgets, rootKey)
}
}
/**
* A preference fragment that demonstrates preferences that launch a dialog when tapped.
*/
class DialogPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.dialogs, rootKey)
}
}
/**
* A preference fragment that demonstrates more advanced attributes and functionality.
*/
class AdvancedPreferencesFragment : PreferenceFragmentCompat() {
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
setPreferencesFromResource(R.xml.advanced, rootKey)
}
}
}