Customizing

package com.example.i310_54.myapplication08;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.CountDownTimer;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;

import java.util.Random;

class Tiger extends View {

    public Tiger(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Paint paint=new Paint();  // Create a tool to draw
        paint.setColor(Color.RED);

        //Canvas is where I draw
        canvas.drawRect(100,200,300,400,paint); //draw a rectangle
        
    }
}
public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        Tiger tiger = new Tiger(this);
        setContentView(tiger);


    }
}

 

package com.example.i310_54.myapplication08;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.CountDownTimer;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;

import java.util.Random;

class Tiger extends View {
    int x=0;
    public Tiger(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Paint paint = new Paint();
        paint.setColor(Color.RED);
        x+=20;
        canvas.drawRect(100-x, 200-x, 300+x, 400+x, paint);


    }
}

public class MainActivity extends AppCompatActivity {
    String TAG = "EUN";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);

        final Tiger tiger = new Tiger(this);
        setContentView(tiger);

        tiger.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction()==MotionEvent.ACTION_DOWN) {
                    v.invalidate(); // invalidate 함수는 무조건 onDraw call
                }
                return false;
            }
        });


    }
}