add a color picker

app/src/main/java/draw/simplemobiletools/com/MainActivity.java

@@ -1,24 +1,53 @@
 package draw.simplemobiletools.com;
 
+import android.graphics.Color;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
+import android.view.View;
 
 import butterknife.Bind;
 import butterknife.ButterKnife;
 import butterknife.OnClick;
+import yuku.ambilwarna.AmbilWarnaDialog;
 
 public class MainActivity extends AppCompatActivity {
     @Bind(R.id.my_canvas) MyCanvas myCanvas;
+    @Bind(R.id.color_picker) View colorPicker;
+    private int color;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         ButterKnife.bind(this);
+
+        setColor(Color.BLACK);
     }
 
     @OnClick(R.id.undo)
     public void undo() {
         myCanvas.undo();
     }
+
+    @OnClick(R.id.color_picker)
+    public void pickColor() {
+        AmbilWarnaDialog dialog = new AmbilWarnaDialog(this, color, new AmbilWarnaDialog.OnAmbilWarnaListener() {
+            @Override
+            public void onCancel(AmbilWarnaDialog dialog) {
+            }
+
+            @Override
+            public void onOk(AmbilWarnaDialog dialog, int pickedColor) {
+                setColor(pickedColor);
+            }
+        });
+
+        dialog.show();
+    }
+
+    private void setColor(int pickedColor) {
+        color = pickedColor;
+        colorPicker.setBackgroundColor(color);
+        myCanvas.setColor(color);
+    }
 }

app/src/main/java/draw/simplemobiletools/com/MyCanvas.java

@@ -44,6 +44,10 @@ public class MyCanvas extends View {
         invalidate();
     }
 
+    public void setColor(int color) {
+        paint.setColor(color);
+    }
+
     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);