add a stroboscope effect

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

@@ -2,6 +2,7 @@ package com.simplemobiletools.flashlight;
 
 import android.content.Context;
 import android.hardware.Camera;
+import android.os.Handler;
 import android.util.Log;
 
 import com.squareup.otto.Bus;
@@ -13,9 +14,12 @@ public class MyCameraImpl {
     private static Bus mBus;
     private Context mContext;
     private MarshmallowCamera mMarshmallowCamera;
+    private volatile boolean mShouldStroboscopeStop;
+    private volatile boolean mIsStroboscopeRunning;
 
     private static boolean mIsFlashlightOn;
     private static boolean mIsMarshmallow;
+    private static boolean mShouldEnableFlashlight;
 
     public MyCameraImpl(Context cxt) {
         mContext = cxt;
@@ -35,6 +39,31 @@ public class MyCameraImpl {
         handleCameraSetup();
     }
 
+    public boolean toggleStroboscope() {
+        if (!mIsStroboscopeRunning)
+            disableFlashlight();
+
+        if (mCamera == null) {
+            initCamera();
+        }
+
+        if (mCamera == null) {
+            Utils.showToast(mContext, R.string.camera_error);
+            return false;
+        }
+
+        if (mIsStroboscopeRunning) {
+            stopStroboscope();
+        } else {
+            new Thread(stroboscope).start();
+        }
+        return true;
+    }
+
+    private void stopStroboscope() {
+        mShouldStroboscopeStop = true;
+    }
+
     public void handleCameraSetup() {
         if (mIsMarshmallow) {
             setupMarshmallowCamera();
@@ -55,15 +84,19 @@ public class MyCameraImpl {
             return;
 
         if (mCamera == null) {
-            try {
+            initCamera();
-                mCamera = Camera.open();
+        }
-                mParams = mCamera.getParameters();
+    }
-                mParams.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
+
-                mCamera.setParameters(mParams);
+    private void initCamera() {
-            } catch (Exception e) {
+        try {
-                Log.e(TAG, "setup mCamera " + e.getMessage());
+            mCamera = Camera.open();
-                mBus.post(new Events.CameraUnavailable());
+            mParams = mCamera.getParameters();
-            }
+            mParams.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
+            mCamera.setParameters(mParams);
+        } catch (Exception e) {
+            Log.e(TAG, "setup mCamera " + e.getMessage());
+            mBus.post(new Events.CameraUnavailable());
         }
     }
 
@@ -76,6 +109,12 @@ public class MyCameraImpl {
     }
 
     public void enableFlashlight() {
+        mShouldStroboscopeStop = true;
+        if (mIsStroboscopeRunning) {
+            mShouldEnableFlashlight = true;
+            return;
+        }
+
         mIsFlashlightOn = true;
         if (mIsMarshmallow) {
             toggleMarshmallowFlashlight(true);
@@ -88,12 +127,19 @@ public class MyCameraImpl {
             mCamera.setParameters(mParams);
             mCamera.startPreview();
         }
-        mBus.post(new Events.StateChanged(true));
+
+        Runnable mainRunnable = new Runnable() {
+            @Override
+            public void run() {
+                mBus.post(new Events.StateChanged(true));
+            }
+        };
+        new Handler(mContext.getMainLooper()).post(mainRunnable);
     }
 
     private void disableFlashlight() {
         mIsFlashlightOn = false;
-        if (isMarshmallow()) {
+        if (mIsMarshmallow) {
             toggleMarshmallowFlashlight(false);
         } else {
             if (mCamera == null || mParams == null) {
@@ -129,4 +175,51 @@ public class MyCameraImpl {
     private boolean isMarshmallow() {
         return android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M;
     }
+
+    private Runnable stroboscope = new Runnable() {
+        @Override
+        public void run() {
+            if (mIsStroboscopeRunning) {
+                return;
+            }
+
+            mShouldStroboscopeStop = false;
+            mIsStroboscopeRunning = true;
+
+            if (mCamera == null) {
+                initCamera();
+            }
+
+            Camera.Parameters torchOn = mCamera.getParameters();
+            Camera.Parameters torchOff = mCamera.getParameters();
+            torchOn.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
+            torchOff.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
+
+            while (!mShouldStroboscopeStop) {
+                try {
+                    mCamera.setParameters(torchOn);
+                    Thread.sleep(500);
+                    mCamera.setParameters(torchOff);
+                    Thread.sleep(500);
+                } catch (InterruptedException ignored) {
+                    mShouldStroboscopeStop = true;
+                } catch (RuntimeException ignored) {
+                    mShouldStroboscopeStop = true;
+                }
+            }
+
+            if (mCamera != null) {
+                mCamera.setParameters(torchOff);
+                mCamera.release();
+                mCamera = null;
+            }
+            mIsStroboscopeRunning = false;
+            mShouldStroboscopeStop = false;
+
+            if (mShouldEnableFlashlight) {
+                enableFlashlight();
+                mShouldEnableFlashlight = false;
+            }
+        }
+    };
 }

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

@@ -1,8 +1,12 @@
 package com.simplemobiletools.flashlight.activities;
 
+import android.Manifest;
 import android.content.Intent;
+import android.content.pm.PackageManager;
 import android.graphics.PorterDuff;
 import android.os.Bundle;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -24,6 +28,8 @@ import butterknife.ButterKnife;
 import butterknife.OnClick;
 
 public class MainActivity extends SimpleActivity {
+    private static final int CAMERA_PERMISSION = 1;
+
     @BindView(R.id.toggle_btn) ImageView mToggleBtn;
     @BindView(R.id.bright_display_btn) ImageView mBrightDisplayBtn;
     @BindView(R.id.stroboscope_btn) ImageView mStroboscopeBtn;
@@ -70,6 +76,7 @@ public class MainActivity extends SimpleActivity {
 
     @OnClick(R.id.toggle_btn)
     public void toggleFlashlight() {
+        mStroboscopeBar.setVisibility(View.INVISIBLE);
         mCameraImpl.toggleFlashlight();
     }
 
@@ -79,8 +86,33 @@ public class MainActivity extends SimpleActivity {
     }
 
     @OnClick(R.id.stroboscope_btn)
-    public void launchStroboscope() {
+    public void tryToggleStroboscope() {
+        toggleStroboscope();
+    }
 
+    private void toggleStroboscope() {
+        // use the old Camera API for stroboscope, the new Camera Manager is way too slow
+        if (isCameraPermissionGranted()) {
+            if (mCameraImpl.toggleStroboscope()) {
+                mStroboscopeBar.setVisibility(mStroboscopeBar.getVisibility() == View.VISIBLE ? View.INVISIBLE : View.VISIBLE);
+            }
+        } else {
+            final String[] permissions = {Manifest.permission.CAMERA};
+            ActivityCompat.requestPermissions(this, permissions, CAMERA_PERMISSION);
+        }
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+
+        if (requestCode == CAMERA_PERMISSION) {
+            if (isCameraPermissionGranted()) {
+                toggleStroboscope();
+            } else {
+                Utils.showToast(getApplicationContext(), R.string.camera_permission);
+            }
+        }
     }
 
     @Override
@@ -123,6 +155,10 @@ public class MainActivity extends SimpleActivity {
         }
     }
 
+    private boolean isCameraPermissionGranted() {
+        return ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
+    }
+
     @Subscribe
     public void stateChangedEvent(Events.StateChanged event) {
         if (event.getIsEnabled()) {

app/src/main/res/values-de/strings.xml

@@ -3,6 +3,7 @@
     <string name="app_launcher_name">Flashlight</string>
     <string name="camera_error">Beanspruchen der Kamera fehlgeschlagen</string>
     <string name="ok">OK</string>
+    <string name="camera_permission">Camera permission is necessary for proper stroboscope effect</string>
 
     <!-- Settings -->
     <string name="settings">Einstellungen</string>

app/src/main/res/values-it/strings.xml

@@ -3,6 +3,7 @@
     <string name="app_launcher_name">Flashlight</string>
     <string name="camera_error">Rilevamento fotocamera fallito</string>
     <string name="ok">OK</string>
+    <string name="camera_permission">Camera permission is necessary for proper stroboscope effect</string>
 
     <!-- Settings -->
     <string name="settings">Impostazioni</string>

app/src/main/res/values-ja/strings.xml

@@ -3,6 +3,7 @@
     <string name="app_launcher_name">Flashlight</string>
     <string name="camera_error">カメラの取得に失敗しました</string>
     <string name="ok">OK</string>
+    <string name="camera_permission">Camera permission is necessary for proper stroboscope effect</string>
 
     <!-- Settings -->
     <string name="settings">設定</string>

app/src/main/res/values-sv/strings.xml

@@ -3,6 +3,7 @@
     <string name="app_launcher_name">Flashlight</string>
     <string name="camera_error">Det gick inte att komma åt kameran</string>
     <string name="ok">OK</string>
+    <string name="camera_permission">Camera permission is necessary for proper stroboscope effect</string>
 
     <!-- Settings -->
     <string name="settings">Inställningar</string>

app/src/main/res/values/strings.xml

@@ -3,6 +3,7 @@
     <string name="app_launcher_name">Flashlight</string>
     <string name="camera_error">Obtaining the camera failed</string>
     <string name="ok">OK</string>
+    <string name="camera_permission">Camera permission is necessary for proper stroboscope effect</string>
 
     <!-- Settings -->
     <string name="settings">Settings</string>