Android中view的简单应用---随手指移动的小球

public class DrawView extends View{    public  float currentX=40;    public float currentY=50;    public DrawView(Context context){        super(context);    }    //重写ondraw,通过canvas绘画    protected void onDraw(Canvas canvas){        Paint paint=new Paint();        paint.setColor(Color.RED);        canvas.drawCircle(currentX,currentY,25,paint);    }

<?xml version="1.0" encoding="utf-8"?>

public class MainActivity extends Activity{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        LinearLayout root=(LinearLayout) findViewById(R.id.root);        final DrawView drawView=new DrawView(this);        WindowManager wm = this.getWindowManager();        int width = wm.getDefaultDisplay().getWidth();        int height = wm.getDefaultDisplay().getHeight();        Toast.makeText(this,"width is"+width+"height"+height,Toast.LENGTH_LONG).show();        drawView.setMinimumHeight(300);        drawView.setMinimumHeight(500);        drawView.setOnTouchListener(new View.OnTouchListener(){            @Override            public boolean onTouch(View v, MotionEvent event) {                drawView.currentX=event.getX();                drawView.currentY=event.getY();                drawView.invalidate();                return  true;            }        });            root.addView(drawView);    }}

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