Support configuring view in xml

app/src/main/res/layout/activity_main.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -43,6 +44,13 @@
       android:id="@+id/paintView"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
+      app:showCanvasBounds="true"
+      app:strokeColor="@android:color/darker_gray"
+      app:maxZoom="3"
+      app:minZoom="1"
+      app:canvasHeight="1080px"
+      app:canvasWidth="1920px"
+      app:strokeWidth="15"
       />
 
 </LinearLayout>

library/src/main/java/me/panavtec/drawableview/DrawableView.java

@@ -2,12 +2,15 @@
 
 import android.annotation.TargetApi;
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.RectF;
 import android.os.Build;
 import android.os.Parcelable;
 import android.util.AttributeSet;
+import android.util.DisplayMetrics;
+import android.util.Log;
 import android.view.GestureDetector;
 import android.view.MotionEvent;
 import android.view.ScaleGestureDetector;
@@ -49,17 +52,20 @@ public DrawableView(Context context) {
   public DrawableView(Context context, AttributeSet attrs) {
     super(context, attrs);
     init();
+    setAttributeSet(context, attrs);
   }
 
   public DrawableView(Context context, AttributeSet attrs, int defStyleAttr) {
     super(context, attrs, defStyleAttr);
     init();
+    setAttributeSet(context, attrs);
   }
 
   @TargetApi(Build.VERSION_CODES.LOLLIPOP) public DrawableView(Context context, AttributeSet attrs,
       int defStyleAttr, int defStyleRes) {
     super(context, attrs, defStyleAttr, defStyleRes);
     init();
+    setAttributeSet(context, attrs);
   }
 
   private void init() {
@@ -74,6 +80,33 @@ private void init() {
     setOnTouchListener(this);
   }
 
+  private void setAttributeSet(Context context, AttributeSet attributeSet){
+
+    TypedArray a = context.getTheme().obtainStyledAttributes(
+            attributeSet,
+            R.styleable.DrawableView,
+            0, 0);
+
+    try {
+      DisplayMetrics metrics = context.getResources().getDisplayMetrics();
+      int windowWidth = metrics.widthPixels;
+      int windowHeight = metrics.heightPixels;
+
+      DrawableViewConfig config = new DrawableViewConfig();
+      config.setCanvasHeight(a.getDimensionPixelSize(R.styleable.DrawableView_canvasHeight, windowHeight));
+      config.setCanvasWidth(a.getDimensionPixelSize(R.styleable.DrawableView_canvasWidth, windowWidth));
+      config.setStrokeColor(a.getColor(R.styleable.DrawableView_strokeColor, context.getResources().getColor(android.R.color.black)));
+      config.setShowCanvasBounds(a.getBoolean(R.styleable.DrawableView_showCanvasBounds, true));
+      config.setMinZoom(a.getFloat(R.styleable.DrawableView_minZoom, 1.0f));
+      config.setMaxZoom(a.getFloat(R.styleable.DrawableView_maxZoom, 3.0f));
+      config.setStrokeWidth(a.getFloat(R.styleable.DrawableView_strokeWidth, 20f));
+      setConfig(config);
+
+    } finally {
+      a.recycle();
+    }
+  }
+
   public void setConfig(DrawableViewConfig config) {
     if (config == null) {
       throw new IllegalArgumentException("Paint configuration cannot be null");

library/src/main/res/values/attrs.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="DrawableView">
+        <attr name="canvasWidth" format="dimension" />
+        <attr name="canvasHeight" format="dimension" />
+        <attr name="maxZoom" format="float" />
+        <attr name="minZoom" format="float" />
+        <attr name="strokeWidth" format="float" />
+        <attr name="showCanvasBounds" format="boolean" />
+        <attr name="strokeColor" format="color" />
+    </declare-styleable>
+</resources>