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| 1 | +/* |
| 2 | + * Copyright (c) 2024 David Allison <davidallisongithub@gmail.com> |
| 3 | + * Copyright (c) 2026 Shaan Narendran <shaannaren06@gmail.com> |
| 4 | + * |
| 5 | + * This program is free software; you can redistribute it and/or modify it under |
| 6 | + * the terms of the GNU General Public License as published by the Free Software |
| 7 | + * Foundation; either version 3 of the License, or (at your option) any later |
| 8 | + * version. |
| 9 | + * |
| 10 | + * This program is distributed in the hope that it will be useful, but WITHOUT ANY |
| 11 | + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
| 12 | + * PARTICULAR PURPOSE. See the GNU General Public License for more details. |
| 13 | + * |
| 14 | + * You should have received a copy of the GNU General Public License along with |
| 15 | + * this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | + */ |
| 17 | + |
| 18 | +package com.ichi2.preferences |
| 19 | + |
| 20 | +import android.content.Context |
| 21 | +import android.graphics.Color |
| 22 | +import android.text.Spannable |
| 23 | +import android.text.SpannableString |
| 24 | +import android.text.style.ForegroundColorSpan |
| 25 | +import android.util.AttributeSet |
| 26 | +import androidx.appcompat.app.AlertDialog |
| 27 | +import androidx.fragment.app.DialogFragment |
| 28 | +import androidx.preference.ListPreference |
| 29 | +import androidx.preference.ListPreferenceDialogFragmentCompat |
| 30 | +import com.ichi2.anki.BuildConfig |
| 31 | +import com.ichi2.anki.CollectionHelper |
| 32 | +import com.ichi2.anki.R |
| 33 | +import com.ichi2.anki.showThemedToast |
| 34 | +import com.ichi2.utils.input |
| 35 | +import com.ichi2.utils.negativeButton |
| 36 | +import com.ichi2.utils.positiveButton |
| 37 | +import com.ichi2.utils.show |
| 38 | +import timber.log.Timber |
| 39 | +import java.io.File |
| 40 | +import java.io.FileFilter |
| 41 | + |
| 42 | +/** |
| 43 | + * Displays a list of external directories to select for the AnkiDroid Directory |
| 44 | + * |
| 45 | + * Improving discoverability of using a SD Card for the directory |
| 46 | + * |
| 47 | + * Also provides the ability to input a custom path |
| 48 | + * |
| 49 | + * @see ListPreferenceTrait - this preference can either be a List or an EditText |
| 50 | + */ |
| 51 | +class ExternalDirectorySelectionPreference( |
| 52 | + context: Context, |
| 53 | + attrs: AttributeSet?, |
| 54 | +) : ListPreference(context, attrs), |
| 55 | + ListPreferenceTrait { |
| 56 | + init { |
| 57 | + dialogLayoutResource = androidx.preference.R.layout.preference_dialog_edittext |
| 58 | + summaryProvider = |
| 59 | + SummaryProvider<ListPreference> { pref -> |
| 60 | + pref.value.takeUnless { it.isNullOrEmpty() } ?: context.getString(R.string.pref_directory_not_set) |
| 61 | + } |
| 62 | + } |
| 63 | + |
| 64 | + // below are default values for the listEntries and listValue variables, they are set in makeDialogFragment() |
| 65 | + override var listEntries: List<ListPreferenceTrait.Entry> = emptyList() |
| 66 | + override var listValue: String = "" |
| 67 | + |
| 68 | + /** Safely retrieves the default AnkiDroid directory, returning null on failure. */ |
| 69 | + private val defaultAnkiDir: File? |
| 70 | + get() = |
| 71 | + try { |
| 72 | + CollectionHelper.getDefaultAnkiDroidDirectory(context) |
| 73 | + } catch (e: Exception) { |
| 74 | + Timber.w(e, "Could not access default AnkiDroid directory") |
| 75 | + null |
| 76 | + } |
| 77 | + |
| 78 | + /** Builds the list of available directories for selection. */ |
| 79 | + private fun loadDirectories(): List<ListPreferenceTrait.Entry> = |
| 80 | + buildList { |
| 81 | + val defaultDir = defaultAnkiDir |
| 82 | + val currentPath = value ?: defaultDir?.absolutePath ?: "" |
| 83 | + if (currentPath.isNotEmpty()) { |
| 84 | + add(createEntry(File(currentPath))) |
| 85 | + } |
| 86 | + if (defaultDir != null && defaultDir.absolutePath != currentPath) { |
| 87 | + add(createEntry(defaultDir)) |
| 88 | + } |
| 89 | + val scannedEntries = |
| 90 | + getScannedDirectories() |
| 91 | + .filter { |
| 92 | + it.absolutePath != currentPath && it.absolutePath != defaultDir?.absolutePath |
| 93 | + }.map { createEntry(it) } |
| 94 | + addAll(scannedEntries) |
| 95 | + } |
| 96 | + |
| 97 | + /** |
| 98 | + * Safely scans all external directories. |
| 99 | + * If one directory fails to scan, we log it and continue to the next one |
| 100 | + */ |
| 101 | + private fun getScannedDirectories(): List<File> { |
| 102 | + val roots = |
| 103 | + try { |
| 104 | + CollectionHelper.getAppSpecificExternalDirectories(context).filterNotNull() |
| 105 | + } catch (e: Exception) { |
| 106 | + Timber.w(e, "Critical error getting storage roots") |
| 107 | + return emptyList() |
| 108 | + } |
| 109 | + return roots |
| 110 | + .flatMap { rootDir -> |
| 111 | + try { |
| 112 | + findAnkiDroidSubDirectories(rootDir) |
| 113 | + } catch (e: Exception) { |
| 114 | + Timber.w(e, "Could not scan directory: ${rootDir.absolutePath}") |
| 115 | + emptyList() |
| 116 | + } |
| 117 | + }.distinct() |
| 118 | + } |
| 119 | + |
| 120 | + // TODO: Possibly move loadDirectories() to a background thread if ANR occurs |
| 121 | + override fun makeDialogFragment(): DialogFragment { |
| 122 | + listEntries = loadDirectories() |
| 123 | + entries = listEntries.map { it.key }.toTypedArray() |
| 124 | + setEntryValues(listEntries.map { it.value as CharSequence }.toTypedArray()) |
| 125 | + listValue = value ?: defaultAnkiDir?.absolutePath ?: "" |
| 126 | + setValue(listValue) |
| 127 | + return FullWidthListPreferenceDialogFragment() |
| 128 | + } |
| 129 | + |
| 130 | + /** Creates a display entry. */ |
| 131 | + private fun createEntry(file: File): ListPreferenceTrait.Entry { |
| 132 | + val path = file.absolutePath |
| 133 | + // Find the standard Android directory to split the path for display |
| 134 | + // Eg: "/storage/emulated/0"->Gray "/Android/data/com.ichi2.anki"->Normal |
| 135 | + val androidIndex = path.indexOf("/Android/") |
| 136 | + // If index is not found, then return the path as is |
| 137 | + if (androidIndex == -1) return ListPreferenceTrait.Entry(path, path) |
| 138 | + val displayString = "${path.take(androidIndex)}\n${path.substring(androidIndex)}" |
| 139 | + val spannable = |
| 140 | + SpannableString(displayString).apply { |
| 141 | + setSpan(ForegroundColorSpan(Color.GRAY), 0, androidIndex, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE) |
| 142 | + } |
| 143 | + return ListPreferenceTrait.Entry(spannable, path) |
| 144 | + } |
| 145 | + |
| 146 | + companion object { |
| 147 | + // This is only a heuristic implementation |
| 148 | + private val ANKI_DIR_FILTER = FileFilter { it.isDirectory && it.name.startsWith("AnkiDroid") } |
| 149 | + |
| 150 | + /** Finds subdirectories matching "AnkiDroid*" pattern within the given directory. */ |
| 151 | + fun findAnkiDroidSubDirectories(f: File): List<File> = f.listFiles(ANKI_DIR_FILTER)?.toList() ?: emptyList() |
| 152 | + } |
| 153 | +} |
| 154 | + |
| 155 | +/** A DialogFragment that allows custom path input if on a device before Android 11, or on a full release version. */ |
| 156 | +class FullWidthListPreferenceDialogFragment : ListPreferenceDialogFragmentCompat() { |
| 157 | + override fun onPrepareDialogBuilder(builder: AlertDialog.Builder) { |
| 158 | + super.onPrepareDialogBuilder(builder) |
| 159 | + val isPlayStoreBuild = BuildConfig.FLAVOR == "play" |
| 160 | + val isScopedStorageEnforced = android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.R |
| 161 | + if (!isPlayStoreBuild || !isScopedStorageEnforced) { |
| 162 | + builder.setNeutralButton(R.string.pref_custom_path) { _, _ -> showCustomPathInput() } |
| 163 | + } |
| 164 | + } |
| 165 | + |
| 166 | + private fun showCustomPathInput() { |
| 167 | + val context = requireContext() |
| 168 | + val pref = (preference as? ExternalDirectorySelectionPreference) ?: return |
| 169 | + AlertDialog |
| 170 | + .Builder(context) |
| 171 | + .show { |
| 172 | + setTitle(R.string.pref_enter_custom_path) |
| 173 | + setView(R.layout.dialog_generic_text_input) |
| 174 | + positiveButton(android.R.string.ok) |
| 175 | + negativeButton(android.R.string.cancel) |
| 176 | + }.input( |
| 177 | + prefill = pref.value ?: "", |
| 178 | + allowEmpty = false, |
| 179 | + ) { dialog, text -> |
| 180 | + val newPath = text.toString().trim() |
| 181 | + val directory = File(newPath) |
| 182 | + when { |
| 183 | + !directory.exists() && !directory.mkdirs() -> { |
| 184 | + showThemedToast( |
| 185 | + context, |
| 186 | + context.getString(R.string.could_not_create_dir), |
| 187 | + true, |
| 188 | + ) |
| 189 | + } |
| 190 | + !directory.canWrite() -> { |
| 191 | + showThemedToast( |
| 192 | + context, |
| 193 | + context.getString(R.string.pref_directory_not_writable), |
| 194 | + true, |
| 195 | + ) |
| 196 | + } |
| 197 | + else -> { |
| 198 | + dialog.dismiss() |
| 199 | + if (pref.callChangeListener(newPath)) { |
| 200 | + pref.value = newPath |
| 201 | + pref.listValue = newPath |
| 202 | + } |
| 203 | + } |
| 204 | + } |
| 205 | + } |
| 206 | + } |
| 207 | + |
| 208 | + override fun onStart() { |
| 209 | + super.onStart() |
| 210 | + dialog?.window?.setLayout( |
| 211 | + android.view.ViewGroup.LayoutParams.MATCH_PARENT, |
| 212 | + android.view.ViewGroup.LayoutParams.WRAP_CONTENT, |
| 213 | + ) |
| 214 | + } |
| 215 | +} |
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