feat: select directory to save last book cover image (#2521)

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/android/src/main/java/NativeBridgePlugin.kt

@@ -8,6 +8,7 @@ import android.util.Log
 import android.os.Build
 import android.os.Environment
 import android.provider.Settings
+import android.provider.DocumentsContract
 import android.view.View
 import android.view.KeyEvent
 import android.view.WindowInsets
@@ -25,6 +26,8 @@ import androidx.core.content.FileProvider
 import androidx.core.content.ContextCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.WindowInsetsControllerCompat
+import androidx.activity.result.ActivityResultLauncher
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.browser.customtabs.CustomTabsIntent
 import app.tauri.annotation.Command
 import app.tauri.annotation.InvokeArg
@@ -128,11 +131,16 @@ class NativeBridgePlugin(private val activity: Activity): Plugin(activity) {
     }
 
     companion object {
-        var pendingInvoke: Invoke? = null
         private const val REQUEST_MANAGE_STORAGE = 1001
+        private const val FOLDER_PICKER_REQUEST_CODE = 1002
+        var pendingInvoke: Invoke? = null
+        var pendingFolderPickerInvoke: Invoke? = null
+        private var instance: NativeBridgePlugin? = null
+        fun getInstance(): NativeBridgePlugin? = instance
     }
 
     override fun load(webView: WebView) {
+        instance = this
         super.load(webView)
         handleIntent(activity.intent)
     }
@@ -682,4 +690,87 @@ class NativeBridgePlugin(private val activity: Activity): Plugin(activity) {
             invoke.reject("Failed to open URL: ${e.message}")
         }
     }
+
+    @Command
+    fun select_directory(invoke: Invoke) {
+        pendingFolderPickerInvoke = invoke
+
+        try {
+            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+            activity.startActivityForResult(intent, FOLDER_PICKER_REQUEST_CODE)
+        } catch (e: Exception) {
+            val result = JSObject()
+            result.put("cancelled", true)
+            result.put("uri", null)
+            result.put("path", null)
+            result.put("error", e.message)
+            invoke.resolve(result)
+            pendingFolderPickerInvoke = null
+        }
+    }
+
+    fun handleActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        if (requestCode == FOLDER_PICKER_REQUEST_CODE) {
+            val invoke = pendingFolderPickerInvoke
+            if (invoke != null) {
+                handleDirectorySelected(data?.data, invoke)
+                pendingFolderPickerInvoke = null
+            }
+        }
+    }
+
+    private fun handleDirectorySelected(uri: Uri?, invoke: Invoke) {
+        val result = JSObject()
+        if (uri == null) {
+            result.put("cancelled", true)
+            result.put("uri", null)
+            result.put("path", null)
+        } else {
+            try {
+                val flags = Intent.FLAG_GRANT_READ_URI_PERMISSION or
+                          Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+                activity.contentResolver.takePersistableUriPermission(uri, flags)
+                result.put("cancelled", false)
+                result.put("uri", uri.toString())
+                result.put("path", extractPathFromUri(uri))
+            } catch (e: SecurityException) {
+                result.put("cancelled", true)
+                result.put("uri", uri.toString())
+                result.put("path", extractPathFromUri(uri))
+                result.put("error", "Permission error: ${e.message}")
+            } catch (e: Exception) {
+                result.put("cancelled", true)
+                result.put("uri", null)
+                result.put("path", null)
+                result.put("error", "Error: ${e.message}")
+            }
+        }
+
+        invoke.resolve(result)
+        pendingInvoke = null
+    }
+
+    private fun extractPathFromUri(uri: Uri): String? {
+        val path = uri.path ?: return null
+        return try {
+            when {
+                DocumentsContract.isTreeUri(uri) -> {
+                    val treeDocId = DocumentsContract.getTreeDocumentId(uri)
+                    val split = treeDocId.split(":")
+                    if (split[0].equals("primary", ignoreCase = true)) {
+                        if (split.size > 1) {
+                            Environment.getExternalStorageDirectory().path + "/" + split[1]
+                        } else {
+                            Environment.getExternalStorageDirectory().path
+                        }
+                    } else {
+                        "/storage/${split[0]}/" + (if (split.size > 1) split[1] else "")
+                    }
+                }
+                else -> null
+            }
+        } catch (e: Exception) {
+            path
+        }
+    }
 }