PreferenceActivity 中的 PreferenceDialog - 目标片段必须实现 TargetFragment 接口

Question

我正在尝试在首选项活动中实现 DialogPreference。我实现了它，但似乎 setTargetFragment 被标记为已弃用。

这是我的旧代码：

override fun onDisplayPreferenceDialog(preference: Preference?) {
            val clearStatsDialog = preference as? DialogPreferenceClearStats
            if (clearStatsDialog != null) {
                val dialogFragment = DialogPrefCompat.newInstance(clearStatsDialog.key)
                dialogFragment.setTargetFragment(this, 0)
                dialogFragment.positiveResult = {
                    Toast.makeText(activity, "yes", Toast.LENGTH_LONG).show()
                }
                dialogFragment.show(this.parentFragmentManager, null)
            } else {
                super.onDisplayPreferenceDialog(preference)
            }
        }

我想用 setFragmentResultListener 替换它，但我总是收到“目标片段必须实现 TargetFragment 接口”异常。

有人能帮我吗？

这是完整的代码：

import android.content.Context
import android.content.Intent
import android.net.Uri
import android.os.Bundle
import android.util.AttributeSet
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.preference.DialogPreference
import androidx.preference.Preference
import androidx.preference.PreferenceDialogFragmentCompat
import androidx.preference.PreferenceFragmentCompat
import com.workout.intervaltimer.R
import com.workout.intervaltimer.util.WorkoutTimerUtil


class DialogPreferenceClearStats(context: Context, attrs: AttributeSet?) : DialogPreference(context, attrs), DialogPreference.TargetFragment {
    override fun <T : Preference?> findPreference(key: CharSequence): T? {
        TODO("Not yet implemented")
    }
}

class DialogPrefCompat : PreferenceDialogFragmentCompat() {
    lateinit var positiveResult: ()->Unit

    override fun onDialogClosed(positiveResult: Boolean) {
        if (positiveResult) {
            positiveResult()
        }
    }

    companion object {
        fun newInstance(key: String): DialogPrefCompat {
            val fragment = DialogPrefCompat()
            val bundle = Bundle(1)
            bundle.putString(PreferenceDialogFragmentCompat.ARG_KEY, key)
            fragment.arguments = bundle
            return fragment
        }
    }
}

class SettingsActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.settings_activity)
        if (savedInstanceState == null) {
            supportFragmentManager
                    .beginTransaction()
                    .replace(R.id.settings, SettingsFragment())
                    .commit()
        }
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
    }

    class SettingsFragment : PreferenceFragmentCompat() {
        override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
            setPreferencesFromResource(R.xml.root_preferences, rootKey)
        }

        override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
            super.onViewCreated(view, savedInstanceState)

            this.parentFragmentManager.setFragmentResultListener("requestKey", viewLifecycleOwner) { requestKey, bundle ->
                val dialogFragment = DialogPrefCompat.newInstance("clearStatsDialog.key")
                dialogFragment.positiveResult = {
                    Toast.makeText(activity, "yes", Toast.LENGTH_LONG).show()
                }
                dialogFragment.show(this.parentFragmentManager, null)
            }
        }

        override fun onDisplayPreferenceDialog(preference: Preference?) {
            val clearStatsDialog = preference as? DialogPreferenceClearStats
            if (clearStatsDialog != null) {
                this.parentFragmentManager.setFragmentResult("requestKey", Bundle())
            }
        }

        override fun onPreferenceTreeClick(preference: Preference?): Boolean {
            //It should be possible to launchs activities and websites from xml intent but I didn't achieve it.
            when (preference!!.key) {
                getString(R.string.force_dark_theme) -> {
                    WorkoutTimerUtil.setDayNightThemeForApp(requireActivity().applicationContext)
                }

                getString(R.string.third_party_software) -> {
                    val intent = Intent(Intent.ACTION_VIEW)
                    intent.data = Uri.parse(WEB_THIRD_PARTY_SOFTWARE)
                    startActivity(intent)
                }

                getString(R.string.terms_conditions) -> {
                    val intent = Intent(Intent.ACTION_VIEW)
                    intent.data = Uri.parse(WEB_TERMS)
                    startActivity(intent)
                }

                getString(R.string.privacy_policy) -> {
                    val intent = Intent(Intent.ACTION_VIEW)
                     intent.data = Uri.parse(WEB_PRIVACY_POLICY)
                    startActivity(intent)
                }
            }

            return super.onPreferenceTreeClick(preference)
        }
    }

    companion object {
        const val WEB_THIRD_PARTY_SOFTWARE = "https://sites.google.com/view/that-third-party-software"
        const val WEB_TERMS = "https://sites.google.com/view/that-terms-conditions"
        const val WEB_PRIVACY_POLICY = "https://sites.google.com/view/that-privacy-policy"
    }
}

提前致谢。

Answer 1

我认为这种行为与下一个 Android bug 有关：

https://issuetracker.google.com/issues/181793702

Preferences 库 v.1.2.0（2022 年 11 月 1 日）的问题仍未修复。

即使 Lint 表示不推荐使用该方法，也必须调用setTargetFragment() 。