手动更改首选项时，使“ onSharedPreferenceChanged”运行

问题描述

我正在选择一个文件目录作为自定义首选项，该首选项本身可以正常工作，但是，我希望摘要作为路径本身，经过一番挖掘后，我发现“ onSharedPreferenceChanged”似乎很完美，但是当我更改首选项值时，不会调用此函数，但会为其他首选项调用该函数。

class SettingsFragment : PreferenceFragmentCompat(),SharedPreferences.OnSharedPreferenceChangeListener {
        override fun onCreatePreferences(savedInstanceState: Bundle?,rootKey: String?) {
            setPreferencesFromResource(R.xml.preference_main,rootKey)
            val filePicker = findPreference("filepicker") as Preference?
            filePicker!!.onPreferenceClickListener = Preference.OnPreferenceClickListener {
                val i = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
                i.addCategory(Intent.CATEGORY_DEFAULT)
                startActivityForResult(Intent.createChooser(i,"Choose directory"),9999)
                return@OnPreferenceClickListener true
            }
        }

        override fun onResume() {
            preferenceScreen.sharedPreferences
                .registerOnSharedPreferenceChangeListener(this)
            super.onResume()
        }

        override fun onPause() {
            preferenceScreen.sharedPreferences
                .unregisterOnSharedPreferenceChangeListener(this)
            super.onPause()
        }
        override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?,key: String?) {
            if (key == "filePicker") {
                findPreference<Preference>(key)?.summary =
                    sharedPreferences!!.getString(
                        key,Environment.getExternalStoragePublicDirectory(
                            Environment.DIRECTORY_DOWNLOADS
                        ).toString() + "/ytdl"
                    )
            }
        }
    }

override fun onActivityResult(requestCode: Int,resultCode: Int,data: Intent?) {
        super.onActivityResult(requestCode,resultCode,data)
        val uri: Uri = data!!.data!!
        if (uri.toString().contains("content://com.android.providers")) {
            Toast.makeText(
                this,"Don't use \"Open from Downloads\"',select the one with your phone name",Toast.LENGTH_SHORT
            ).show()
        } else {
            //Code to change preference vaule
            val path_ = FileUtil.getFullPathFromTreeUri(uri,this)
            mSharedPreferences.edit().putString("filepicker",path_).apply()
            Toast.makeText(this,path_,Toast.LENGTH_SHORT).show()
            path = path_
        }
    }

解决方法

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