Merge pull request adrielcafe#2 from prakh25/TODO---IMAGE-TINT

Tint Images

Author: adrielcafe

lib/src/main/java/cafe/adriel/androidaudiorecorder/AudioRecorderActivity.java

@@ -1,7 +1,9 @@
 package cafe.adriel.androidaudiorecorder;
 
 import android.graphics.Color;
+import android.graphics.PorterDuff;
 import android.graphics.drawable.ColorDrawable;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.view.Menu;
@@ -30,7 +32,7 @@ public class AudioRecorderActivity extends AppCompatActivity {
     private boolean isRecording;
     private String filePath;
     private int color;
-
+    private boolean isBright; //variable to check brightness
     private RelativeLayout contentLayout;
     private TextView timerView;
     private ImageView micView;
@@ -59,7 +61,21 @@ protected void onCreate(Bundle savedInstanceState) {
         micView = (ImageView) findViewById(R.id.mic);
         recordView = (ImageButton) findViewById(R.id.record);
 
+        // to get drawable resources of check icon and clear icon
+        Drawable clear = getResources().getDrawable(R.drawable.ic_clear);
+        Drawable check = getResources().getDrawable(R.drawable.ic_check);
+
         contentLayout.setBackgroundColor(color);
+
+        // check to set tint of images
+        isBright = isBrightColor(color);
+        if(isBright) {
+            micView.setColorFilter(Color.BLACK);
+            recordView.setColorFilter(Color.BLACK);
+            timerView.setTextColor(Color.BLACK);
+            clear.setColorFilter(Color.BLACK, PorterDuff.Mode.SRC_ATOP);
+            check.setColorFilter(Color.BLACK, PorterDuff.Mode.SRC_ATOP);
+        }
     }
 
     @Override
@@ -174,4 +190,25 @@ public void run() {
         });
     }
 
-}
+    /**
+     * Function to check brightness of background color
+     * @param color
+     * @return
+     */
+    public boolean isBrightColor (int color) {
+        if(android.R.color.transparent == color) {
+            return true;
+        }
+
+        int [] rgb = {Color.red(color), Color.green(color), Color.blue(color)};
+
+        int brightness = (int) Math.sqrt(rgb[0]*rgb[0]*0.241
+                + rgb[1]*rgb[1]*0.691 + rgb[2]*rgb[2]*0.068);
+
+        //color is bright
+        if(brightness >= 200) {
+            return true;
+        }
+        return false;
+    }
+}