import android.graphics.PorterDuff;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Display;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

Canvas canvas;

ImageView view;
Paint paint;

int x,y;
int endx, endy;

@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   view = (ImageView) findViewById(R.id.img_view);
   Display currentDisplay = getWindowManager().getDefaultDisplay();
   float w = currentDisplay.getWidth();
   float h = currentDisplay.getHeight();
   Bitmap bitmap = Bitmap.createBitmap((int) w, (int) h,
            Bitmap.Config.ARGB_8888);
   canvas = new Canvas(bitmap);
   paint = new Paint();
   paint.setColor(Color.MAGENTA);
   paint.setStrokeWidth(20);
   view.setImageBitmap(bitmap);
   endx = (int) ( 2 * w / 3) ;
   x = (int) w / 3 ;
   endy = y = (int) h / 2;
   canvas.drawLine(x, y, endx, endy, paint);
}

public void clickButton(View v){
   switch (v.getId()){
         case R.id.left:
            endx -= 10;
            x -= 10;
            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
            canvas.drawLine(x, y, endx, endy, paint);
            view.invalidate();
            break;
         case R.id.down:
            endy += 10;
            y += 10;
            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
            canvas.drawLine(x, y, endx, endy, paint);
            view.invalidate();
            break;
         case R.id.up:
            endy -= 10;
            y -= 10;
            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
            canvas.drawLine(x, y, endx, endy, paint);
            view.invalidate();
            break;
         case R.id.right:
            endx += 10;
            x += 10;
            canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
            canvas.drawLine(x, y, endx, endy, paint);
            view.invalidate();
            break;
         case R.id.blue:
            paint.setColor(Color.BLUE);
            canvas.drawLine(x, y, endx, endy, paint);
            view.invalidate();
            break;

Write a program that launches 1,000 threads. Each thread adds 1 to...