do not require the Camera permission on marshmallow+

app/src/main/java/com/simplemobiletools/flashlight/MainActivity.java

@@ -47,7 +47,7 @@ public class MainActivity extends AppCompatActivity implements MyCamera {
     }
 
     private void setupCameraImpl() {
-        cameraImpl = new MyCameraImpl(this);
+        cameraImpl = new MyCameraImpl(this, this);
         cameraImpl.toggleFlashlight();
     }
 

app/src/main/java/com/simplemobiletools/flashlight/MyCameraImpl.java

@@ -1,15 +1,24 @@
 package com.simplemobiletools.flashlight;
 
+import android.annotation.TargetApi;
+import android.content.Context;
 import android.hardware.Camera;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraManager;
+import android.os.Build;
+import android.util.Log;
 
 public class MyCameraImpl {
+    private static final String TAG = MyCameraImpl.class.getSimpleName();
     private Camera camera;
     private Camera.Parameters params;
     private boolean isFlashlightOn;
     private MyCamera callback;
+    private Context context;
 
-    public MyCameraImpl(MyCamera camera) {
+    public MyCameraImpl(MyCamera camera, Context cxt) {
         callback = camera;
+        context = cxt;
         setupCamera();
     }
 
@@ -25,6 +34,9 @@ public class MyCameraImpl {
     }
 
     public void setupCamera() {
+        if (isMarshmallow())
+            return;
+
         if (camera == null) {
             try {
                 camera = Camera.open();
@@ -35,33 +47,58 @@ public class MyCameraImpl {
                 if (isFlashlightOn)
                     enableFlashlight();
             } catch (Exception e) {
+                Log.e(TAG, "setup camera " + e.getMessage());
                 callback.cameraUnavailable();
             }
         }
     }
 
     private void enableFlashlight() {
+        if (isMarshmallow()) {
+            toggleMarshmallowFlashlight(true);
+        } else {
             if (camera == null || params == null)
                 return;
 
             params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
             camera.setParameters(params);
+        }
         callback.enableFlashlight();
     }
 
     private void disableFlashlight() {
+        if (isMarshmallow()) {
+            toggleMarshmallowFlashlight(false);
+        } else {
             if (camera == null || params == null)
                 return;
 
             params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
             camera.setParameters(params);
+        }
         callback.disableFlashlight();
     }
 
+    @TargetApi(Build.VERSION_CODES.M)
+    private void toggleMarshmallowFlashlight(boolean enable) {
+        try {
+            final CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
+            final String[] list = manager.getCameraIdList();
+            manager.setTorchMode(list[0], enable);
+        } catch (CameraAccessException e) {
+            Log.e(TAG, "toggle marshmallow flashlight " + e.getMessage());
+            callback.cameraUnavailable();
+        }
+    }
+
     public void releaseCamera() {
         if (camera != null) {
             camera.release();
             camera = null;
         }
     }
+
+    private boolean isMarshmallow() {
+        return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M;
+    }
 }

app/src/main/java/com/simplemobiletools/flashlight/MyWidgetProvider.java

@@ -37,7 +37,7 @@ public class MyWidgetProvider extends AppWidgetProvider implements MyCamera {
         final PendingIntent pendingIntent = PendingIntent.getBroadcast(cxt, 0, intent, 0);
         remoteViews = new RemoteViews(cxt.getPackageName(), R.layout.widget);
         remoteViews.setOnClickPendingIntent(R.id.toggle_btn, pendingIntent);
-        cameraImpl = new MyCameraImpl(this);
+        cameraImpl = new MyCameraImpl(this, cxt);
 
         final Resources res = cxt.getResources();
         final int appColor = res.getColor(R.color.colorPrimary);