refactor(core): use absolute path to plugin Android project (#6773)

.changes/plugin-android-project-refactor.md

@@ -0,0 +1,6 @@
+---
+"cli.rs": patch
+"tauri-build": patch
+---
+
+Use absolute path to each Android plugin project instead of copying the files to enhance developer experience.

core/tauri-build/src/lib.rs

@@ -15,8 +15,9 @@ use tauri_utils::{
 };
 
 use std::{
+  collections::HashMap,
   env::var_os,
-  fs::{read_dir, write},
+  fs::{read_to_string, write},
   path::{Path, PathBuf},
 };
 
@@ -298,22 +299,24 @@ val implementation by configurations
 dependencies {"
       .to_string();
 
-    for entry in read_dir(project_dir.join(".tauri").join("plugins"))? {
-      let pkg_name = entry?
-        .path()
-        .file_name()
-        .unwrap()
-        .to_string_lossy()
-        .into_owned();
-      gradle_settings.push_str(&format!("include ':{pkg_name}'"));
+    let plugins_json_path = project_dir.join(".tauri").join("plugins.json");
+    let plugins: HashMap<String, mobile::PluginMetadata> = if plugins_json_path.exists() {
+      let s = read_to_string(&plugins_json_path)?;
+      serde_json::from_str(&s)?
+    } else {
+      Default::default()
+    };
+    for (plugin_name, plugin) in plugins {
+      gradle_settings.push_str(&format!("include ':{plugin_name}'"));
       gradle_settings.push('\n');
       gradle_settings.push_str(&format!(
-        "project(':{pkg_name}').projectDir = new File('./.tauri/plugins/{pkg_name}')"
+        "project(':{plugin_name}').projectDir = new File('{}')",
+        plugin.path.display()
       ));
       gradle_settings.push('\n');
 
       app_build_gradle.push('\n');
-      app_build_gradle.push_str(&format!(r#"  implementation(project(":{pkg_name}"))"#));
+      app_build_gradle.push_str(&format!(r#"  implementation(project(":{plugin_name}"))"#));
     }
     app_build_gradle.push_str("\n}");
 

core/tauri-build/src/mobile.rs

@@ -3,12 +3,19 @@
 // SPDX-License-Identifier: MIT
 
 use std::{
+  collections::HashMap,
   env::{var, var_os},
-  fs::{copy, create_dir, create_dir_all, remove_dir_all, rename},
+  fs::{copy, create_dir, create_dir_all, read_to_string, remove_dir_all, rename, write},
   path::{Path, PathBuf},
 };
 
 use anyhow::{Context, Result};
+use serde::{Deserialize, Serialize};
+
+#[derive(Deserialize, Serialize)]
+pub(crate) struct PluginMetadata {
+  pub path: PathBuf,
+}
 
 #[derive(Default)]
 pub struct PluginBuilder {
@@ -49,6 +56,7 @@ impl PluginBuilder {
 
           let tauri_library_path = std::env::var("DEP_TAURI_ANDROID_LIBRARY_PATH")
             .expect("missing `DEP_TAURI_ANDROID_LIBRARY_PATH` environment variable. Make sure `tauri` is a dependency of the plugin.");
+          println!("cargo:rerun-if-env-changed=DEP_TAURI_ANDROID_LIBRARY_PATH");
 
           create_dir_all(source.join(".tauri")).context("failed to create .tauri directory")?;
           copy_folder(
@@ -62,12 +70,15 @@ impl PluginBuilder {
             let pkg_name = var("CARGO_PKG_NAME").unwrap();
             println!("cargo:rerun-if-env-changed=TAURI_ANDROID_PROJECT_PATH");
 
-            inject_android_project(
-              &source,
-              project_dir.join(".tauri").join("plugins").join(pkg_name),
-              &["tauri-api"],
-            )
-            .context("failed to inject plugin Android project")?;
+            let plugins_json_path = project_dir.join(".tauri").join("plugins.json");
+            let mut plugins: HashMap<String, PluginMetadata> = if plugins_json_path.exists() {
+              let s = read_to_string(&plugins_json_path)?;
+              serde_json::from_str(&s)?
+            } else {
+              Default::default()
+            };
+            plugins.insert(pkg_name, PluginMetadata { path: source });
+            write(&plugins_json_path, serde_json::to_string(&plugins)?)?;
           }
         }
       }

tooling/cli/src/mobile/mod.rs

@@ -316,7 +316,7 @@ fn ensure_init(project_dir: PathBuf, target: Target) -> Result<()> {
     )
   } else {
     if target == Target::Android {
-      create_dir_all(project_dir.join(".tauri").join("plugins"))?;
+      create_dir_all(project_dir.join(".tauri"))?;
     }
     Ok(())
   }