Working video recorder based on deprecated camera api

app/src/main/java/com/example/ueberwachungssystem/MainActivity.java

 import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.os.Environment;
+import android.view.SurfaceView;
 import android.view.View;
 import android.widget.TextView;
 import android.widget.Toast;
 import android.widget.ToggleButton;
+import android.widget.VideoView;
 
 import java.io.File;
 import java.io.IOException;
         setContentView(R.layout.activity_main);
 
         TextView textView = findViewById(R.id.textView);
-        PreviewView previewView = findViewById(R.id.previewView);
-
+        SurfaceView surfaceView = findViewById(R.id.surfaceView);
+        VideoView videoView = findViewById(R.id.videoView);
 
         File directory = getFilesDir();
 
 
         Recorder recorder = new Recorder(this);
+        recorder.setSurfaceView(surfaceView);
 
 
         ToggleButton toggleButton = findViewById(R.id.previewButton);
                 }
                 else {
                     File[] files = directory.listFiles();
-                    textView.setText(Arrays.toString(files));
+                    //textView.setText(Arrays.toString(files));
                     recorder.stopRecording();
+                    recorder.playVideo(videoView);
                 }
             }
         });

app/src/main/java/com/example/ueberwachungssystem/Recorder.java

 package com.example.ueberwachungssystem;
 
 import android.content.Context;
+import android.hardware.Camera;
+import android.media.CamcorderProfile;
+import android.media.MediaPlayer;
 import android.media.MediaRecorder;
-import android.os.Environment;
-
-import androidx.camera.core.Camera;
-
-import java.io.File;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.widget.VideoView;
 import java.io.IOException;
 
 public class Recorder {
 
-    Context context;
-    MediaRecorder mediaRecorder = null;
+    private final Context context;
+    private Camera camera;
+    private MediaRecorder mediaRecorder = null;
+    private SurfaceView surfaceView;
 
     public Recorder (Context context) {
         this.context = context;
+        this.surfaceView = new SurfaceView(context);
     }
 
 
     public void startRecording() {
+        try {
+            // Open the camera
+            camera = Camera.open();
+            camera.setPreviewDisplay(surfaceView.getHolder());
+            camera.startPreview();
 
-        mediaRecorder = new MediaRecorder();
+            camera.unlock();
 
-        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
-        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
-        mediaRecorder.setOutputFile(context.getFilesDir() + "/audio.gpp");
-        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
+            // Create a new MediaRecorder instance
+            mediaRecorder = new MediaRecorder();
 
+            // Set the camera as the video source
+            mediaRecorder.setCamera(camera);
+
+            // Set the audio and video source
+            mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
+            mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
+
+
+            CamcorderProfile camcorderProfile = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH);
+            mediaRecorder.setProfile(camcorderProfile);
+
+            // Set the output file path
+            mediaRecorder.setOutputFile(context.getFilesDir() + "/video.mp4");
 
 
-        try {
             mediaRecorder.prepare();
+            mediaRecorder.start();
+
         } catch (IOException e) {
             e.printStackTrace();
         }
-        mediaRecorder.start();
     }
 
     public void stopRecording() {
         if (mediaRecorder != null) {
-            mediaRecorder.stop();
-            mediaRecorder.reset();
-            mediaRecorder.release();
-            mediaRecorder = null;
+            try {
+                mediaRecorder.stop();
+                mediaRecorder.reset();
+                mediaRecorder.release();
+                mediaRecorder = null;
+            } catch (RuntimeException e) {
+                // RuntimeException may be thrown if the MediaRecorder is in an invalid state
+                e.printStackTrace();
+            }
+
+            if (camera != null) {
+                try {
+                    camera.reconnect();
+                    camera.stopPreview();
+                    camera.lock();
+                    camera.release();
+                    camera = null;
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
         }
     }
 
-
-
-    private void initMediaRecorder() {
-        // Set the audio and video source
-        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
-        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
-
-        // Set the output format and file path
-        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
-        //String videoFilePath = getOutputMediaFilePath(); // Custom method to get the output file path
-        mediaRecorder.setOutputFile(context.getFilesDir());
-
-        // Set the video encoder and audio encoder
-        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
-        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
-
-        // Configure video size, frame rate, and other settings as needed
-        mediaRecorder.setVideoSize(640, 480); // Set the desired video size
-        mediaRecorder.setVideoFrameRate(30); // Set the desired frame rate
+    public void setSurfaceView(SurfaceView surfaceView) {
+        this.surfaceView = surfaceView;
     }
 
 
-    private String getOutputMediaFilePath() {
-        String videoFileName = "Video.mp4";
-        File storageDir = context.getFilesDir();
-
-        if (!storageDir.exists()) {
-            storageDir.mkdirs();
+    private void playAudio() {
+        MediaPlayer mp = new MediaPlayer();
+        try {
+            mp.setDataSource(context.getFilesDir() + "/audio.gpp");
+            mp.prepare();
+            mp.start();
+        } catch (Exception e) {
+            e.printStackTrace();
         }
+    }
 
-        return storageDir.getAbsolutePath() + "/" + videoFileName;
+    public void playVideo(VideoView videoView) {
+        videoView.setVideoPath(context.getFilesDir() + "/video.mp4");
+        videoView.start();
     }
 }

app/src/main/res/layout/activity_main.xml

         android:layout_height="wrap_content"
         android:text="ToggleButton" />
 
+    <SurfaceView
+        android:id="@+id/surfaceView"
+        android:layout_width="match_parent"
+        android:layout_height="400dp" />
 
-    <androidx.camera.view.PreviewView
-        android:id="@+id/previewView"
+    <VideoView
+        android:id="@+id/videoView"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:backgroundTint="@android:color/black"/>
+        android:layout_height="wrap_content" />
+
 
 </LinearLayout>