address #313 (don't unbind service more than once!) and refactor Preview to CameraViewHolder

Author: n8fr8

src/main/java/org/havenapp/main/sensors/motion/Preview.java renamed to src/main/java/org/havenapp/main/sensors/motion/CameraViewHolder.java

@@ -14,7 +14,6 @@
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.graphics.Bitmap;
-import android.hardware.Camera;
 import android.os.Environment;
 import android.os.Handler;
 import android.os.IBinder;
@@ -29,16 +28,11 @@
 import org.havenapp.main.PreferenceManager;
 import org.havenapp.main.model.EventTrigger;
 import org.havenapp.main.service.MonitorService;
-import org.jcodec.api.SequenceEncoder;
 import org.jcodec.api.android.AndroidSequenceEncoder;
-import org.jcodec.codecs.vpx.IVFMuxer;
-import org.jcodec.codecs.vpx.VP8Encoder;
-import org.jcodec.common.io.SeekableByteChannel;
 
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
-import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
@@ -49,7 +43,7 @@
 
 import io.github.silvaren.easyrs.tools.Nv21Image;
 
-public class Preview {
+public class CameraViewHolder {
 
     /**
      * Object to retrieve and set shared preferences
@@ -118,7 +112,7 @@ public void onServiceDisconnected(ComponentName arg0) {
         }
     };
 
-	public Preview (Context context, CameraView cameraView) {
+	public CameraViewHolder(Context context, CameraView cameraView) {
 		//super(context);
 		this.context = context;
 		this.cameraView = cameraView;
@@ -175,14 +169,14 @@ public void initCamera() {
         cameraView.setOnFrameListener((data, width, height, rotationDegrees) -> {
 
             long now = System.currentTimeMillis();
-            if (now < Preview.this.lastTimestamp + PREVIEW_INTERVAL)
+            if (now < CameraViewHolder.this.lastTimestamp + PREVIEW_INTERVAL)
                 return;
 
-            Preview.this.lastTimestamp = now;
+            CameraViewHolder.this.lastTimestamp = now;
 
             if (!doingVideoProcessing) {
 
-                Log.i("Preview", "Processing new image");
+                Log.i("CameraViewHolder", "Processing new image");
 
                 mDecodeThreadPool.execute(() -> processNewFrame(data, width, height, rotationDegrees));
             }
@@ -304,7 +298,7 @@ private void processNewFrame (byte[] data, int width, int height, int rotationDe
 
                     } catch (Exception e) {
                         // Cannot happen
-                        Log.e("Preview", "error creating image", e);
+                        Log.e("CameraViewHolder", "error creating image", e);
                     }
                 }
             }
@@ -343,19 +337,23 @@ private synchronized boolean recordVideo() {
     }
 
 
-    public void stopCamera ()
+    public synchronized void stopCamera ()
     {
         if (cameraView != null) {
-            // Surface will be destroyed when we return, so stop the preview.
-            // Because the CameraDevice object is not a shared resource, it's very
-            // important to release it when the activity is paused.
-            this.context.unbindService(mConnection);
-
            cameraView.stop();
         }
     }
 
     public int getCameraFacing() {
         return cameraView.getFacing();
     }
+
+    public void destroy ()
+    {
+        if (mConnection != null) {
+            this.context.unbindService(mConnection);
+            mConnection = null;
+        }
+        stopCamera();
+    }
 }

src/main/java/org/havenapp/main/ui/CameraFragment.java

@@ -10,7 +10,6 @@
 
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
-import android.hardware.Camera;
 import android.hardware.SensorEvent;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -21,12 +20,11 @@
 
 import org.havenapp.main.PreferenceManager;
 import org.havenapp.main.R;
-import org.havenapp.main.sensors.media.ImageCodec;
-import org.havenapp.main.sensors.motion.Preview;
+import org.havenapp.main.sensors.motion.CameraViewHolder;
 
 public final class CameraFragment extends Fragment {
 
-    private Preview cameraViewHolder;
+    private CameraViewHolder cameraViewHolder;
     private ImageView newImage;
 
     @Override
@@ -85,7 +83,7 @@ private void initCamera ()
 
             CameraView cameraView = getActivity().findViewById(R.id.camera_view);
 
-            cameraViewHolder = new Preview(getContext().getApplicationContext(),cameraView);
+            cameraViewHolder = new CameraViewHolder(getContext().getApplicationContext(),cameraView);
 
             newImage = getActivity().findViewById(R.id.new_image);
 
@@ -100,6 +98,7 @@ private void initCamera ()
     @Override
     public void onDestroy() {
         super.onDestroy();
+        cameraViewHolder.destroy();
 
     }