diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt
index 840399d..fd27af6 100644
--- a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaMuxController.kt
@@ -21,6 +21,7 @@ open class MediaMuxController {
             return false
         }
         var happenError = false
+        // 1、create MediaMuxer
         val mediaMuxer = MediaMuxer(outputPath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4)
         val mediaExtractor = MediaExtractor()
         try {
@@ -28,7 +29,11 @@ open class MediaMuxController {
             var audioIndex = 0
             var audioFormat: MediaFormat? = null
             var videoFormat: MediaFormat? = null
+            var finished = false
+            val bufferInfo = MediaCodec.BufferInfo()
+            val inputBuffer = ByteBuffer.allocate(2 * 1024 * 1024)
             mediaExtractor.setDataSource(inputPath)
+            // select track with mimetype
             for (i in 0 until mediaExtractor.trackCount) {
                 val mediaFormat = mediaExtractor.getTrackFormat(i)
                 val mimeType = mediaFormat.getString(MediaFormat.KEY_MIME)
@@ -42,25 +47,24 @@ open class MediaMuxController {
                     mediaExtractor.selectTrack(i)
                 }
             }
+            // 2、add MediaFormat into track
             if (videoFormat != null) {
                 mediaMuxer.addTrack(videoFormat)
             }
             if (audioFormat != null) {
                 mediaMuxer.addTrack(audioFormat)
             }
-
-            var finished = false
-            val bufferInfo = MediaCodec.BufferInfo()
-            val inputBuffer = ByteBuffer.allocate(2 * 1024 * 1024)
-
+            // 3、start the muxer
             mediaMuxer.start()
 
             while (!finished) {
+                // demux media stream
                 val sampleSize = mediaExtractor.readSampleData(inputBuffer, 0)
                 if (sampleSize > 0) {
                     bufferInfo.size = sampleSize
                     bufferInfo.flags = mediaExtractor.sampleFlags
                     bufferInfo.presentationTimeUs = mediaExtractor.sampleTime
+                    // 4、call MediaMuxer to mux media stream
                     if (mediaExtractor.sampleTrackIndex == videoIndex) {
                         mediaMuxer.writeSampleData(videoIndex, inputBuffer, bufferInfo)
                     } else if (mediaExtractor.sampleTrackIndex == audioIndex) {
@@ -77,12 +81,9 @@ open class MediaMuxController {
             Log.e("MediaMuxController", "mux error=$e")
             happenError = true
         } finally {
-            try {
-                mediaMuxer.release()
-                mediaExtractor.release()
-            } catch (e1: Exception) {
-                Log.e("MediaMuxController", "release error=$e1")
-            }
+            // 5、release resource
+            mediaMuxer.release()
+            mediaExtractor.release()
             return !happenError
         }
     }
diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaProjectionController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaProjectionController.kt
new file mode 100644
index 0000000..990e509
--- /dev/null
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaProjectionController.kt
@@ -0,0 +1,100 @@
+package com.frank.androidmedia.controller
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.graphics.Bitmap
+import android.graphics.PixelFormat
+import android.hardware.display.DisplayManager
+import android.media.ImageReader
+import android.media.projection.MediaProjection
+import android.media.projection.MediaProjectionManager
+import android.os.Environment
+import android.util.DisplayMetrics
+import android.view.Surface
+import android.view.WindowManager
+import java.io.FileOutputStream
+import java.lang.Exception
+
+/**
+ * Using MediaProjectionManager to screenshot,
+ * and using MediaProjection recording screen.
+ *
+ * @author frank
+ * @date 2022/3/25
+ */
+open class MediaProjectionController(screenshot: Boolean) {
+
+    private var screenshot = true
+    private val requestCode = 1234
+    private var displayMetrics: DisplayMetrics? = null
+    private var mediaProjection: MediaProjection? = null
+    private var mediaProjectionManager: MediaProjectionManager? = null
+
+    init {
+        this.screenshot = screenshot
+    }
+
+    fun startScreenRecord(context: Context) {
+        val windowManager = context.getSystemService(Context.WINDOW_SERVICE) as WindowManager
+        displayMetrics = DisplayMetrics()
+        windowManager.defaultDisplay.getMetrics(displayMetrics)
+        mediaProjectionManager = context.getSystemService(Context.MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
+        val intent = mediaProjectionManager?.createScreenCaptureIntent()
+        (context as Activity).startActivityForResult(intent, requestCode)
+    }
+
+    private fun saveBitmap(bitmap: Bitmap?, path: String) {
+        if (path.isEmpty() || bitmap == null)
+            return
+        var outputStream: FileOutputStream? = null
+        try {
+            outputStream = FileOutputStream(path)
+            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream)
+        } catch (e: Exception) {
+
+        } finally {
+            outputStream?.close()
+        }
+    }
+
+    private fun createVirtualDisplay(surface: Surface) {
+        mediaProjection?.createVirtualDisplay("hello", displayMetrics!!.widthPixels, displayMetrics!!.heightPixels,
+                displayMetrics!!.densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
+                surface, null, null)
+    }
+
+    private fun getBitmap() {
+        val imageReader = ImageReader.newInstance(displayMetrics!!.widthPixels,
+                displayMetrics!!.heightPixels, PixelFormat.RGBA_8888, 3)
+        createVirtualDisplay(imageReader.surface)
+        imageReader.setOnImageAvailableListener ({ reader: ImageReader ->
+
+            val image = reader.acquireNextImage()
+            val planes = image.planes
+            val buffer = planes[0].buffer
+            val pixelStride = planes[0].pixelStride
+            val rowStride = planes[0].rowStride
+            val rowPadding = rowStride - pixelStride * image.width
+            val bitmap = Bitmap.createBitmap(image.width + rowPadding / pixelStride, image.height, Bitmap.Config.ARGB_8888)
+            bitmap.copyPixelsFromBuffer(buffer)
+            val filePath = Environment.getExternalStorageDirectory().path + "/hello.jpg"
+            saveBitmap(bitmap, filePath)
+            image.close()
+            imageReader.close()
+        }, null)
+    }
+
+    fun onActivityResult(resultCode: Int, data: Intent) {
+        mediaProjection = mediaProjectionManager?.getMediaProjection(resultCode, data)
+        if (screenshot) {
+            getBitmap()
+        }
+    }
+
+
+    fun stopScreenRecord() {
+        mediaProjection?.stop()
+    }
+
+}
\ No newline at end of file
diff --git a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaRecordController.kt b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaRecordController.kt
index cb6693c..a2136e5 100644
--- a/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaRecordController.kt
+++ b/AndroidMedia/src/main/java/com/frank/androidmedia/controller/MediaRecordController.kt
@@ -35,11 +35,11 @@ open class MediaRecordController {
             mMediaRecorder?.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
             mMediaRecorder?.setAudioEncoder(MediaRecorder.AudioEncoder.AAC)
             mMediaRecorder?.setVideoEncoder(MediaRecorder.VideoEncoder.H264)
-//            mMediaRecorder?.setVideoSize(640, 480)
-//            mMediaRecorder?.setVideoEncodingBitRate(5000 * 1000)
-//            mMediaRecorder?.setVideoFrameRate(25)
-//            mMediaRecorder?.setAudioChannels(2)
-//            mMediaRecorder?.setAudioSamplingRate(48000)
+            mMediaRecorder?.setVideoSize(640, 480)
+            mMediaRecorder?.setVideoEncodingBitRate(5000 * 1000)
+            mMediaRecorder?.setVideoFrameRate(25)
+            mMediaRecorder?.setAudioChannels(2)
+            mMediaRecorder?.setAudioSamplingRate(48000)
         }
         mMediaRecorder?.setOutputFile(outputPath)
         mMediaRecorder?.setPreviewDisplay(surface)