错误：（25，94）错误：不兼容的类型：SettingsFragment不能转换到碎片

Question

import android.os.Bundle; 
import android.preference.PreferenceFragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v7.app.AppCompatActivity; 

import static android.R.attr.fragment; 

public class AppPreferences extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_note_detail); 

     FragmentManager fragmentManager = getSupportFragmentManager(); 
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 

     SettingsFragment settingsFragment = new SettingsFragment(); 
     // fragmentTransaction.add(android.R.id.content, settingsFragment, "SETTING_FRAGMENT"); 

误差起始这里是settingsFragment并且误差是错误：（25，94）错误：不兼容的类型：SettingsFragment不能转换到碎片

FragmentTransaction setting_fragment = fragmentTransaction.add(android.R.id.content, settingsFragment, "SETTING_FRAGMENT"); 
setting_fragment.commit(); 

，这是我settingsFragment

public static class SettingsFragment extends PreferenceFragment{ 

    @Override 
    public void onCreate(Bundle savedInstanceState){ 
     super.onCreate(savedInstanceState); 

     addPreferencesFromResource(R.xml.app_preferences); 
    } 
} 

Answer 1

您应该使用（如果你想保持兼容性）包含在支持V7的PreferenceFragmentCompat兼容性库。

PreferenceFragment不包含在片段的兼容性集合中，所以将PreferenceFragment更改为PreferenceFragmentCompat应该足够用于您的porpuses。

检查this了。

希望它可以帮助

Answer 2

嘿，我得到了解决我的问题

public class AppPreferences extends AppCompatActivity {

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.activity_note_detail); 

问题是这个代码在这里所以这getSupportFragment();，所以我只使用getFragmentManager();及其作品 // FragmentManager fragmentManager = getSupportFragmentManager(); // FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

SettingsFragment settingsFragment = new SettingsFragment(); 
    FragmentTransaction setting_fragment; 
    setting_fragment = getFragmentManager().beginTransaction().add(android.R.id.content, settingsFragment, "SETTING_FRAGMENT"); 
    setting_fragment.commit(); 


} 

public static class SettingsFragment extends PreferenceFragment { 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     // Load the preferences from an XML resource 
     addPreferencesFromResource(R.xml.app_preferences); 
    } 
} 


}