Potential UI thread blocking issue

1. In TermuxApiReceiver.java, the doWork() method calls SAFAPI.onReceive(this, context, intent).
   Since the implementation of onReceive() performs synchronous file I/O operations, this may also block the UI thread and potentially cause an ANR.

2. In WallpaperAPI.java, onStartCommand() calls getWallpaperFromFile() and getWallpaperFromUrl(), both of which eventually invoke onWallpaperResult(). This method performs bitmap processing and writes the wallpaper to disk. Since these operations are executed on the main thread, the synchronous image processing and file I/O may block the UI thread and cause ANR. According to best practices, the execution of getWallpaperFromFile() and getWallpaperFromUrl() should be moved to a background thread.

3. In MicRecorderAPI.java, onDestroy() calls cleanupMediaRecorder(). Since cleanupMediaRecorder() involves the synchronous call mediaRecorder.stop(), executing it on the UI thread may block the main thread. Following best practices, this method should be moved to a background thread.

Start by tracing TermuxApiReceiver.java's doWork(), WallpaperAPI.java's onStartCommand(), getWallpaperFromFile(), getWallpaperFromUrl(), and onWallpaperResult(), plus MicRecorderAPI.java's onDestroy() and cleanupMediaRecorder(). Verify which synchronous I/O, bitmap processing, and mediaRecorder.stop() calls run on the main thread; done means the listed operations no longer block the UI thread without changing their behavior.