Changing the Color

app/src/main/java/com/dragosholban/androiddrawing/DrawingView.java

@@ -15,6 +15,8 @@
 public class DrawingView extends View {
 
     private ArrayList<Path> paths = new ArrayList<>();
+    private ArrayList<Integer> colors = new ArrayList<>();
+    private int currentColor = 0xFF000000;
 
     public DrawingView(Context context) {
         super(context);
@@ -35,6 +37,7 @@ public DrawingView(Context context, @Nullable AttributeSet attrs, int defStyleAt
 
     public void addPath(Path path) {
         paths.add(path);
+        colors.add(currentColor);
     }
 
     public Path getLastPath() {
@@ -49,12 +52,18 @@ public Path getLastPath() {
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
 
+        int i = 0;
         for (Path path : paths) {
             Paint paint = new Paint();
-            paint.setColor(0X80000000);
+            paint.setColor(colors.get(i));
             paint.setStyle(Paint.Style.STROKE);
             paint.setStrokeWidth(3f);
             canvas.drawPath(path, paint);
+            i++;
         }
     }
+
+    public void setCurrentColor(int color) {
+        currentColor = color;
+    }
 }

app/src/main/java/com/dragosholban/androiddrawing/MainActivity.java

@@ -1,7 +1,9 @@
 package com.dragosholban.androiddrawing;
 
+import android.graphics.drawable.ColorDrawable;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
+import android.view.View;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -15,4 +17,9 @@ protected void onCreate(Bundle savedInstanceState) {
         drawingView = findViewById(R.id.canvas);
         drawingView.setOnTouchListener(new TouchListener());
     }
+
+    public void setColor(View view) {
+        ColorDrawable buttonColor = (ColorDrawable) view.getBackground();
+        drawingView.setCurrentColor(buttonColor.getColor());
+    }
 }

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

@@ -39,24 +39,28 @@
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_margin="1dp"
-            android:background="#FF0000"/>
+            android:background="#FF0000"
+            android:onClick="setColor"/>
         <View
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_margin="1dp"
-            android:background="#00FF00"/>
+            android:background="#00FF00"
+            android:onClick="setColor"/>
         <View
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_margin="1dp"
-            android:background="#0000FF"/>
+            android:background="#0000FF"
+            android:onClick="setColor"/>
         <View
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:layout_margin="1dp"
-            android:background="#000000"/>
+            android:background="#000000"
+            android:onClick="setColor"/>
     </LinearLayout>
 </android.support.constraint.ConstraintLayout>