Java 首选项屏幕显示空白
我让我的首选项屏幕工作，但现在停止显示任何东西，我尝试的任何东西都无法修复它。当我点击按钮时，首选项屏幕显示，但当我点击一个类别时，我只会看到一个空白屏幕，而不是该类别中的内容 Android Studio中显示了该类别的所有视图，但当我运行时，没有显示任何内容-uz-这一定与打开特定类别有关，但我无法理解 我相信这很简单，但如果有人能帮我，我将不胜感激。我快发疯了：哦 AndroidManifest.xmlJava 首选项屏幕显示空白,java,android,xml,android-studio,android-preferences,Java,Android,Xml,Android Studio,Android Preferences,我让我的首选项屏幕工作，但现在停止显示任何东西，我尝试的任何东西都无法修复它。当我点击按钮时，首选项屏幕显示，但当我点击一个类别时，我只会看到一个空白屏幕，而不是该类别中的内容 Android Studio中显示了该类别的所有视图，但当我运行时，没有显示任何内容-uz-这一定与打开特定类别有关，但我无法理解 我相信这很简单，但如果有人能帮我，我将不胜感激。我快发疯了：哦 AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nathaniel.watispend">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TransactionsActivity" />
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" />
<activity android:name=".GraphActivity"></activity>
</application>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<Preference android:title="Test"
android:key="privacyButton"
android:summary=""/>
</PreferenceScreen>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
<header
android:fragment="nathaniel.watispend.SettingsActivity$GeneralPreferenceFragment"
android:icon="@drawable/ic_info_black_24dp"
android:title="@string/pref_header_general" />
</preference-headers>
package nathaniel.watispend;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.support.v7.app.ActionBar;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.RingtonePreference;
import android.text.TextUtils;
import android.view.MenuItem;
import java.util.List;
public class SettingsActivity extends AppCompatPreferenceActivity {
private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object value) {
String stringValue = value.toString();
if (preference instanceof ListPreference) {
ListPreference listPreference = (ListPreference) preference;
int index = listPreference.findIndexOfValue(stringValue);
preference.setSummary(
index >= 0
? listPreference.getEntries()[index]
: null);
} else if (preference instanceof RingtonePreference) {
if (TextUtils.isEmpty(stringValue)) {
preference.setSummary(R.string.pref_ringtone_silent);
} else {
Ringtone ringtone = RingtoneManager.getRingtone(
preference.getContext(), Uri.parse(stringValue));
if (ringtone == null) {
preference.setSummary(null);
} else {
String name = ringtone.getTitle(preference.getContext());
preference.setSummary(name);
}
}
} else {
preference.setSummary(stringValue);
}
return true;
}
};
private static boolean isXLargeTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
}
private static void bindPreferenceSummaryToValue(Preference preference) {
preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
PreferenceManager
.getDefaultSharedPreferences(preference.getContext())
.getString(preference.getKey(), ""));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setupActionBar();
}
private void setupActionBar() {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
// Show the Up button in the action bar.
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onIsMultiPane() {
return isXLargeTablet(this);
}
/**
* {@inheritDoc}
*/
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.pref_headers, target);
}
protected boolean isValidFragment(String fragmentName) {
return PreferenceFragment.class.getName().equals(fragmentName)
|| GeneralPreferenceFragment.class.getName().equals(fragmentName);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class GeneralPreferenceFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
startActivity(new Intent(getActivity(), SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nathaniel.watispend">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TransactionsActivity" />
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" />
<activity android:name=".GraphActivity"></activity>
</application>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<Preference android:title="Test"
android:key="privacyButton"
android:summary=""/>
</PreferenceScreen>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
<header
android:fragment="nathaniel.watispend.SettingsActivity$GeneralPreferenceFragment"
android:icon="@drawable/ic_info_black_24dp"
android:title="@string/pref_header_general" />
</preference-headers>
package nathaniel.watispend;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.support.v7.app.ActionBar;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.RingtonePreference;
import android.text.TextUtils;
import android.view.MenuItem;
import java.util.List;
public class SettingsActivity extends AppCompatPreferenceActivity {
private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object value) {
String stringValue = value.toString();
if (preference instanceof ListPreference) {
ListPreference listPreference = (ListPreference) preference;
int index = listPreference.findIndexOfValue(stringValue);
preference.setSummary(
index >= 0
? listPreference.getEntries()[index]
: null);
} else if (preference instanceof RingtonePreference) {
if (TextUtils.isEmpty(stringValue)) {
preference.setSummary(R.string.pref_ringtone_silent);
} else {
Ringtone ringtone = RingtoneManager.getRingtone(
preference.getContext(), Uri.parse(stringValue));
if (ringtone == null) {
preference.setSummary(null);
} else {
String name = ringtone.getTitle(preference.getContext());
preference.setSummary(name);
}
}
} else {
preference.setSummary(stringValue);
}
return true;
}
};
private static boolean isXLargeTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
}
private static void bindPreferenceSummaryToValue(Preference preference) {
preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
PreferenceManager
.getDefaultSharedPreferences(preference.getContext())
.getString(preference.getKey(), ""));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setupActionBar();
}
private void setupActionBar() {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
// Show the Up button in the action bar.
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onIsMultiPane() {
return isXLargeTablet(this);
}
/**
* {@inheritDoc}
*/
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.pref_headers, target);
}
protected boolean isValidFragment(String fragmentName) {
return PreferenceFragment.class.getName().equals(fragmentName)
|| GeneralPreferenceFragment.class.getName().equals(fragmentName);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class GeneralPreferenceFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
startActivity(new Intent(getActivity(), SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nathaniel.watispend">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TransactionsActivity" />
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" />
<activity android:name=".GraphActivity"></activity>
</application>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<Preference android:title="Test"
android:key="privacyButton"
android:summary=""/>
</PreferenceScreen>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
<header
android:fragment="nathaniel.watispend.SettingsActivity$GeneralPreferenceFragment"
android:icon="@drawable/ic_info_black_24dp"
android:title="@string/pref_header_general" />
</preference-headers>
package nathaniel.watispend;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.support.v7.app.ActionBar;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.RingtonePreference;
import android.text.TextUtils;
import android.view.MenuItem;
import java.util.List;
public class SettingsActivity extends AppCompatPreferenceActivity {
private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object value) {
String stringValue = value.toString();
if (preference instanceof ListPreference) {
ListPreference listPreference = (ListPreference) preference;
int index = listPreference.findIndexOfValue(stringValue);
preference.setSummary(
index >= 0
? listPreference.getEntries()[index]
: null);
} else if (preference instanceof RingtonePreference) {
if (TextUtils.isEmpty(stringValue)) {
preference.setSummary(R.string.pref_ringtone_silent);
} else {
Ringtone ringtone = RingtoneManager.getRingtone(
preference.getContext(), Uri.parse(stringValue));
if (ringtone == null) {
preference.setSummary(null);
} else {
String name = ringtone.getTitle(preference.getContext());
preference.setSummary(name);
}
}
} else {
preference.setSummary(stringValue);
}
return true;
}
};
private static boolean isXLargeTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
}
private static void bindPreferenceSummaryToValue(Preference preference) {
preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
PreferenceManager
.getDefaultSharedPreferences(preference.getContext())
.getString(preference.getKey(), ""));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setupActionBar();
}
private void setupActionBar() {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
// Show the Up button in the action bar.
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onIsMultiPane() {
return isXLargeTablet(this);
}
/**
* {@inheritDoc}
*/
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.pref_headers, target);
}
protected boolean isValidFragment(String fragmentName) {
return PreferenceFragment.class.getName().equals(fragmentName)
|| GeneralPreferenceFragment.class.getName().equals(fragmentName);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class GeneralPreferenceFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
startActivity(new Intent(getActivity(), SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nathaniel.watispend">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TransactionsActivity" />
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings" />
<activity android:name=".GraphActivity"></activity>
</application>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<Preference android:title="Test"
android:key="privacyButton"
android:summary=""/>
</PreferenceScreen>
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
<header
android:fragment="nathaniel.watispend.SettingsActivity$GeneralPreferenceFragment"
android:icon="@drawable/ic_info_black_24dp"
android:title="@string/pref_header_general" />
</preference-headers>
package nathaniel.watispend;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.support.v7.app.ActionBar;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.preference.RingtonePreference;
import android.text.TextUtils;
import android.view.MenuItem;
import java.util.List;
public class SettingsActivity extends AppCompatPreferenceActivity {
private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference, Object value) {
String stringValue = value.toString();
if (preference instanceof ListPreference) {
ListPreference listPreference = (ListPreference) preference;
int index = listPreference.findIndexOfValue(stringValue);
preference.setSummary(
index >= 0
? listPreference.getEntries()[index]
: null);
} else if (preference instanceof RingtonePreference) {
if (TextUtils.isEmpty(stringValue)) {
preference.setSummary(R.string.pref_ringtone_silent);
} else {
Ringtone ringtone = RingtoneManager.getRingtone(
preference.getContext(), Uri.parse(stringValue));
if (ringtone == null) {
preference.setSummary(null);
} else {
String name = ringtone.getTitle(preference.getContext());
preference.setSummary(name);
}
}
} else {
preference.setSummary(stringValue);
}
return true;
}
};
private static boolean isXLargeTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_XLARGE;
}
private static void bindPreferenceSummaryToValue(Preference preference) {
preference.setOnPreferenceChangeListener(sBindPreferenceSummaryToValueListener);
sBindPreferenceSummaryToValueListener.onPreferenceChange(preference,
PreferenceManager
.getDefaultSharedPreferences(preference.getContext())
.getString(preference.getKey(), ""));
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setupActionBar();
}
private void setupActionBar() {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
// Show the Up button in the action bar.
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onIsMultiPane() {
return isXLargeTablet(this);
}
/**
* {@inheritDoc}
*/
@Override
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public void onBuildHeaders(List<Header> target) {
loadHeadersFromResource(R.xml.pref_headers, target);
}
protected boolean isValidFragment(String fragmentName) {
return PreferenceFragment.class.getName().equals(fragmentName)
|| GeneralPreferenceFragment.class.getName().equals(fragmentName);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public static class GeneralPreferenceFragment extends PreferenceFragment {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == android.R.id.home) {
startActivity(new Intent(getActivity(), SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
}
}
包nathaniel.watispend；
导入android.annotation.TargetApi；
导入android.content.Context；
导入android.content.Intent；
导入android.content.res.Configuration；
导入android.media.Ringtone；
导入android.media.ringtonemager；
导入android.net.Uri；
导入android.os.Build；
导入android.os.Bundle；
导入android.preference.ListPreference；
导入android.preference.preference；
导入android.preference.PreferenceActivity；
导入android.support.v7.app.ActionBar；
导入android.preference.PreferenceFragment；
导入android.preference.PreferenceManager；
导入android.preference.RingtonePreference；
导入android.text.TextUtils；
导入android.view.MenuItem；
导入java.util.List；
公共类设置活动扩展AppCompativePreferenceActivity{
私有静态首选项.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener=新首选项.OnPreferenceChangeListener（）{
@凌驾
公共布尔onPreferenceChange（首选项、对象值）{
字符串stringValue=value.toString（）；
if（ListPreference的首选项实例）{
ListPreference=（ListPreference）首选项；
int index=listPreference.findIndexOfValue（stringValue）；
首选项集摘要(
索引>=0
？listPreference.getEntries（）[索引]
：空）；
}else if（RingtonePreference的首选项实例）{
if（TextUtils.isEmpty（stringValue））{
preference.setSummary（R.string.pref_铃声_静音）；
}否则{
Ringtone Ringtone=RingtoneManager.getRingtone(
preference.getContext（），Uri.parse（stringValue））；
如果（铃声==null）{
preference.setSummary（null）；
}否则{
String name=ringtone.getTitle（preference.getContext（））；
首选项。集合摘要（名称）；
}
}
}否则{
首选项.setSummary（stringValue）；
}
返回true；
}
};
私有静态布尔值isxlargetable（上下文）{
返回（context.getResources（）.getConfiguration（）.screenLayout
&Configuration.SCREENLAYOUT\u SIZE\u MASK）>=Configuration.SCREENLAYOUT\u SIZE\u XLARGE；
}
私有静态void bindPreferenceSummaryToValue（首选项）{
setOnPreferenceChangeListener（sBindPreferenceSummaryToValueListener）；
sBindPreferenceSummaryToValueListener.onPreferenceChange（首选项，
优先权经理
.GetDefaultSharedReferences（首选项.getContext（））
.getString（首选项.getKey（），“”）；
}
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setupActionBar（）；
}
私有void setupActionBar（）{
ActionBar ActionBar=getSupportActionBar（）；
if（actionBar！=null）{
//在操作栏中显示“向上”按钮。
actionBar.setDisplayHomeAsUpEnabled（true）；
}
}
@凌驾
公共布尔值onIsMultiPane（）{
返回Isxlarge平板电脑（此）；
}
/**
*{@inheritardoc}
*/
@凌驾
@TargetApi（构建版本代码蜂窝）
public void onBuildHeaders（列表目标）{
loadHeadersFromResource（R.xml.pref_头，目标）；
}
受保护的布尔值isValidFragment（字符串碎片名称）{
返回PreferenceFragment.class.getName（）.equals（fragmentName）
||GeneralReferenceFragment.class.getName（）.equals（fragmentName）；
}
@TargetApi（构建版本代码蜂窝）
公共静态类GeneralReferenceFragment扩展了PreferenceFragment{
@凌驾
创建时的公共void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
设置选项菜单（真）；
}
@凌驾
公共布尔值onOptionsItemSelected（菜单项项）{
int id=item.getItemId（）；
if（id==android.R.id.home）{
startActivity（新意图（getActivity（），setingsActivity.class））；
返回true；
}
返回super.onOptionsItemSelected（项目）；
}
}
}