我在绘制/布局期间得到3个对象分配的警告
super.onDraw(canvas);
canvas.drawColor(Color.WHITE);
Paint textPaint = new Paint();
textPaint.setARGB(50,100,250);
textPaint.setTextAlign(Align.CENTER);
textPaint.setTextSize(50);
textPaint.setTypeface(font);
canvas.drawText("Logan is awesom",canvas.getWidth()/2,200,textPaint);
canvas.drawBitmap(pBall,(canvas.getWidth()/2),changingY,null);
if (changingY <canvas.getHeight()){
changingY += 10;
}else{
changingY=0;
}
Rect middleRect = new Rect();
middleRect.set(0,400,canvas.getWidth(),550);
Paint ourBlue = new Paint();
ourBlue.setColor(Color.BLUE);
canvas.drawRect(middleRect,ourBlue);
我得到一个新的Rect()的错误;
并在两个新的Paint();
确切的错误是避免绘制/布局操作期间的对象分配(预定位和重用)
解决方法
那么你的’错误’指出了确切的问题. onDraw()方法被OS多次调用,因此在这个函数内分配的东西是非常糟糕的主意.
您需要事先分配您的Rect和Paint,并在onDraw中使用它们
您需要事先分配您的Rect和Paint,并在onDraw中使用它们
class YourClass extends View
{
Rect middleRect;
Paint ourBlue;
Paint textPaint;
public YourClass()
{
//constructor
init();
}
private void init()
{
middleRect = new Rect();
ourBlue; = new Paint();
textPaint = new Paint();
ourBlue.setColor(Color.BLUE);
textPaint.setARGB(50,250);
textPaint.setTextAlign(Align.CENTER);
textPaint.setTextSize(50);
textPaint.setTypeface(font);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.WHITE);
canvas.drawText("Logan is awesom",textPaint);
canvas.drawBitmap(pBall,null);
if (changingY <canvas.getHeight()){
changingY += 10;
}else{
changingY=0;
}
//if canvas size doesn't change - this can be moved to init() as well
middleRect.set(0,550);
canvas.drawRect(middleRect,ourBlue);
}
}
