moved to internal function

DocumentScanner.js

@@ -6,11 +6,8 @@ import {
     NativeModules,
     requireNativeComponent,
     View,
-    TouchableOpacity
 } from 'react-native';
 
-import Styles from './styles';
-
 var iface = {
     name: 'DocumentScanner',
     propTypes: {
@@ -34,7 +31,6 @@ class Scanner extends PureComponent{
   static defaultProps = {
     onPictureTaken: ()=>{},
     onProcessing: ()=>{},
-    style: Styles.fill,
   }
 
   componentWillMount(){
@@ -53,17 +49,8 @@ class Scanner extends PureComponent{
     CameraManager.capture();
   }
 
-  focus = ()=>{
-    CameraManager.focus();
-  }
-
   render() {
-    return (
-      <View style={this.props.style}>
-        <DocumentScanner {...this.props} />
-        <TouchableOpacity activeOpacity={1} style={Styles.focusOverlay} onPressOut={() => this.focus()} />
-      </View>
-    );
+    return <DocumentScanner {...this.props} />;
   }
 }
 

android/openCVLibrary310/src/main/AndroidManifest.xml

@@ -4,5 +4,5 @@
       android:versionCode="3100"
       android:versionName="3.1.0">
 
-    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" />
+    <!--<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="21" />-->
 </manifest>

android/src/main/java/com/documentscanner/DocumentScannerModule.java

@@ -33,10 +33,4 @@ public void capture(){
         MainView view = MainView.getInstance();
         view.capture();
     }
-
-    @ReactMethod
-    public void focus(){
-        MainView view = MainView.getInstance();
-        view.focus();
-    }
 }

android/src/main/java/com/documentscanner/views/MainView.java

@@ -2,7 +2,9 @@
 
 import android.app.Activity;
 import android.content.Context;
+import android.support.v4.view.MotionEventCompat;
 import android.view.LayoutInflater;
+import android.view.MotionEvent;
 import android.widget.FrameLayout;
 
 import com.documentscanner.R;
@@ -44,6 +46,20 @@ protected void onLayout(boolean changed, int l, int t, int r, int b) {
         }
     }
 
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+
+        int action = MotionEventCompat.getActionMasked(event);
+
+        switch (action) {
+            case (MotionEvent.ACTION_UP):
+                this.focus();
+                return true;
+            default:
+                return super.onTouchEvent(event);
+        }
+    }
+
     public void setDocumentAnimation(boolean animate){
         view.setDocumentAnimation(animate);
     }
@@ -92,7 +108,7 @@ public void capture() {
         view.capture();
     }
 
-    public void focus() {
+    private void focus() {
         view.focus();
     }
 }