首选项片段选项卡适配器 | 首选项片段选项卡适配器

本文介绍了首选项片段选项卡适配器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我想为我的应用程序构建一个首选项选项卡，但是由于我还有其他从常规片段扩展的选项卡，因此我遇到了不兼容的类型错误，因为PreferenceFragment无法转换为Fragment.

这是我的Tab片段适配器:

public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;

public PagerAdapter(FragmentManager fm, int NumOfTabs) {
    super(fm);
    this.mNumOfTabs = NumOfTabs;
}

@Override
public Fragment getItem(int position) {

    switch (position) {
        case 0:
            Tab1Discover tab1 = new Tab1Discover();
            return tab1;
        case 1:
            Tab2Planning tab2 = new Tab2Planning();
            return tab2;
        case 2:
            Tab3Favorites tab3 = new Tab3Favorites();
            return tab3;
        case 3:
            Tab4Messages tab4 = new Tab4Messages();
            return tab4;
        case 4 :
            /*Tab5Profile tab5 = new Tab5Profile();
            return tab5;*/
            return new PreferenceFragment() {
                @Override
                public void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    addPreferencesFromResource(R.xml.settings);
                }
            };
        default:
            return null;
    }
}

@Override
public int getCount() {
    return mNumOfTabs;
}
}

解决方案

类型不兼容，问题是-您的片段是从support.v4.app.Fragment继承的，而PreferenceFragment是从android.app.Fragment继承的. >

有两种处理方法:

从android.app.Fragment继承所有片段

此处

I want to build a preference tab for my app but since I have other tabs extending from a regular fragment, I have an incompatible types error, as a PreferenceFragment cannot be converted to Fragment.

Here is my Tab Fragment Adapter :

public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;

public PagerAdapter(FragmentManager fm, int NumOfTabs) {
    super(fm);
    this.mNumOfTabs = NumOfTabs;
}

@Override
public Fragment getItem(int position) {

    switch (position) {
        case 0:
            Tab1Discover tab1 = new Tab1Discover();
            return tab1;
        case 1:
            Tab2Planning tab2 = new Tab2Planning();
            return tab2;
        case 2:
            Tab3Favorites tab3 = new Tab3Favorites();
            return tab3;
        case 3:
            Tab4Messages tab4 = new Tab4Messages();
            return tab4;
        case 4 :
            /*Tab5Profile tab5 = new Tab5Profile();
            return tab5;*/
            return new PreferenceFragment() {
                @Override
                public void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    addPreferencesFromResource(R.xml.settings);
                }
            };
        default:
            return null;
    }
}

@Override
public int getCount() {
    return mNumOfTabs;
}
}

解决方案

There are incompatible types, the problem is - your fragments inherited from support.v4.app.Fragment, but PreferenceFragment inherited from android.app.Fragment.

There are two ways you could deal with it:

Inherit all your fragments from android.app.Fragment
Reimplement PreferenceFragment by taken it source code from here for example and inherit it from support.v4.app.Fragment

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