[Android] Canva/Paint繪圖－Saioyan梟夜

示範

XML

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

</android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new Panel(this));
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
    class Panel extends View {
        public Panel(Context context) {
            super(context);
        }

        public void onDraw(Canvas canvas) {
            Paint paint = new Paint();
            paint.setColor(Color.BLUE);
            paint.setStyle(Paint.Style.STROKE);
            paint.setTextSize(100);
            canvas.drawLine(1000, 1000, 0, 0, paint);
            canvas.drawRect(500, 500, 1000, 1000, paint);
            canvas.drawCircle(500, 500, 400, paint);
            canvas.drawText("Hello!", 500, 600, paint);
        }
    }
}