手机屏幕上的Android绘图

Question

我正在开发一个绘制屏幕表面的程序，但我只能让它画点。我怎样才能使它连接dots.I意味着绘制形状不dots.Here是我的代码

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    /* super.onCreate(savedInstanceState); 
    mySurfaceView = new MySurfaceView(this); 
    setContentView(mySurfaceView);*/ 
    super.onCreate(savedInstanceState); 
    init(); 
    mySurfaceView.setOnTouchListener(this); 
    setContentView(mySurfaceView); 
    } 

private void init(){ 

    mySurfaceView = new MySurfaceView(this); 
x = 0; 
y = 0; 

} 

    class MySurfaceView extends SurfaceView implements Runnable{ 

Thread thread = null; 
SurfaceHolder surfaceHolder; 
volatile boolean running = false; 

private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
Random random; 

public MySurfaceView(Context context) { 
super(context); 
// TODO Auto-generated constructor stub 
surfaceHolder = getHolder(); 
random = new Random(); 
} 
@Override 
public void run() { 
// TODO Auto-generated method stub 
while(running){ 
    if(surfaceHolder.getSurface().isValid()){ 
Canvas canvas = surfaceHolder.lockCanvas(); 
//... actual drawing on canvas 

paint.setStyle(Paint.Style.STROKE); 
paint.setStrokeWidth(3); 

int w = canvas.getWidth(); 
int h = canvas.getHeight(); 
// int x = random.nextInt(w-1); 
// int y = random.nextInt(h-1); 
int r = random.nextInt(255); 
int g = random.nextInt(255); 
int b = random.nextInt(255); 
paint.setColor(0xff000000 + (r << 16) + (g << 8) + b); 
canvas.drawPoint(x, y, paint); 

surfaceHolder.unlockCanvasAndPost(canvas); 
    } 
} 
} 

} 

@Override 
public boolean onTouch(View v, MotionEvent event) { 
// TODO Auto-generated method stub 
    x = event.getX(); 
    y = event.getY(); 
return false; 
} 
} 

我只想把它画不点，但连接线，以允许用户在屏幕上画

上

Answer 1

您可以使用：

drawLine(oldX, oldY, x, y, paint); 

也许你还需要检查，如果用户在保持手指在屏幕上或如果手指被取消。此检查：

http://developer.android.com/reference/android/view/MotionEvent.html