PreferenceActivity:getFragmentManager()已被弃用 [英] PreferenceActivity: getFragmentManager() has been deprecated

问题描述

在测试 android.preference.PreferenceActivity 时，我得到以下信息警告:

When testing a android.preference.PreferenceActivity, I get the following warning:

警告:不推荐使用Activity中的[不推荐使用] getFragmentManager()

warning: [deprecation] getFragmentManager() in Activity has been deprecated

这就是我获取当前PreferenceFragment的句柄的方法:

That is how I obtain a handle to the current PreferenceFragment:

FragmentManager fm = this.mActivity.getFragmentManager();
this.currentFragment = (PreferenceFragment) fm.getFragments().get(1);

使用FragmentActivity.getSupportFragmentManager()显然不是一种选择.

Using FragmentActivity.getSupportFragmentManager() is obviously not an option.

我发现 PreferenceFragmentCompat ，它将替换不推荐使用的PreferenceFragment.

I've found PreferenceFragmentCompat, which would replace the deprecated PreferenceFragment.

但是PreferenceActivity是否有任何androidx替代品?

But is there any androidx replacement for the PreferenceActivity?

推荐答案

我想出的是一个AppCompatActivity，它使androidx

What I've came up with is an AppCompatActivity, which inflates androidx PreferenceFragment. I've kept the previous EXTRA_SHOW_FRAGMENT, so that switching to a specific PreferenceFragment still would work. EXTRA_NO_HEADERS has not yet been considered:

/**
 * Preference {@link AppCompatActivity}.
 * @see <a href="https://developer.android.com/reference/androidx/preference/Preference Fragment">PreferenceFragment</a>
**/
public final class PreferenceCompatActivity extends AppCompatActivity {

    /** the class-name of the main {@link androidx.preference.PreferenceFragment} */
    public static final String MAIN_FRAGMENT = "com.acme.fragment.PreferencesFragment";

    /** framework {@link Intent} extra */
    public static final String EXTRA_SHOW_FRAGMENT = ":android:show_fragment";

    /** framework {@link Intent} extra */
    public static final String EXTRA_NO_HEADERS = ":android:no_headers";

    /** the currently displayed {@link PreferenceFragment} */
    private PreferenceFragment currentFragment;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String fragmentName = MAIN_FRAGMENT;
        Intent intent = getIntent();
        if (intent.getStringExtra(EXTRA_SHOW_FRAGMENT) != null) {
            fragmentName = intent.getStringExtra(EXTRA_SHOW_FRAGMENT);
        }
        this.switchToFragment(fragmentName, null);
    }

    private void switchToFragment(String fragmentName, @Nullable Bundle args) {
        PreferenceFragment fragment;
        switch(fragmentName) {
            // case "": {break;}
            default: {
                fragment = new PreferencesFragment();
            }
        }
        getFragmentManager().beginTransaction().replace(android.R.id.content, fragment).commit();
        this.currentFragment = fragment;
    }

    @VisibleForTesting(otherwise = VisibleForTesting.NONE)
    public PreferenceFragment getCurrentFragment() {
        return this.currentFragment;
    }

    ...
}

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更新:同时有 PreferenceFragmentCompat ，默认情况下支持此功能.

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Update: Meanwhile there's PreferenceFragmentCompat, which support this by default.

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