android - subsamplingscaleimageview 清洁引脚图像

Question

我想在更改背景图像时从我的 PinView 中删除所有图钉。我通过将引脚插入坐标 ArrayList 和引脚图像来添加引脚，并且一切正常。

我能怎么做？

Answer 1

您提到您已经在 arrayList 中有点。使用setPin下面的函数（它还需要一个点的“名称”，您可以简单地从 arrayList 中添加点的索引作为名称，使用String.valueOf(//you index);作为引脚的名称）。现在，当您想要删除这些点时，只需对 arrayList 运行一个简单的 for 循环，然后删除所有元素。试试看。

PS 代码还包含一些其他功能，如果您不需要，请随时删除它们。

public class PinView extends SubsamplingScaleImageView {

private ArrayList<PointF> sPin = new ArrayList<>();
private ArrayList<String> pinNames = new ArrayList<>();
private Bitmap pin;
private final float scale=1.5f;

public PinView(Context context) {
    this(context, null);
}

public PinView(Context context, AttributeSet attr) {
    super(context, attr);
    initialise();
}

public boolean setPin(PointF sPin, String name) {
    if (pinNames.contains(name)){
        return false;
    } else {
        this.sPin.add(sPin);
        pinNames.add(name);
        initialise();
        invalidate();
        return true;
    }
}

public PointF getPin(String name) {

    return sPin.get(pinNames.indexOf(name));
}

public boolean removePin(String name){
    if (pinNames.contains(name)){
        sPin.remove(pinNames.indexOf(name));
        pinNames.remove(name);
        System.out.println("Removed pin named : "+name);
        initialise();
        invalidate();
        return true;
    } else {
        System.out.println("No such pins : "+name);
        initialise();
        invalidate();
        return false;
    }
}

public ArrayList<String> getPinNames(){
    return pinNames;
}

private void initialise() {
    float density = getResources().getDisplayMetrics().densityDpi;
    pin = BitmapFactory.decodeResource(this.getResources(), R.drawable.squarered);
    float w = (density/420f) * pin.getWidth();
    float h = (density/420f) * pin.getHeight();
    pin = Bitmap.createScaledBitmap(pin, (int)w, (int)h, true);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    // Don't draw pin before image is ready so it doesn't move around during setup.
    if (!isReady()) {
        return;
    }

    Paint paint = new Paint();
    paint.setAntiAlias(true);
    for (PointF point : sPin){
        if (point != null && pin != null) {
            PointF vPin = sourceToViewCoord(point);
            float vX = vPin.x - (pin.getWidth()/2);
            float vY = vPin.y - pin.getHeight();
            canvas.drawBitmap(pin, vX, vY, paint);
        }
    }
}
public void doAnimationWithTime(PointF target)
{

    //System.out.println("Width : " + this.getSWidth() + " height : " + this.getSHeight());
    SubsamplingScaleImageView.AnimationBuilder animationBuilder = this.animateScaleAndCenter(scale, target);
    animationBuilder.withDuration(700).withEasing(SubsamplingScaleImageView.EASE_OUT_QUAD).withInterruptible(true).start();
}

public boolean isPinVisibleOnImage(String name)
{
    boolean result = false;
    for(int i=0;i<pinNames.size();i++)
    {
        if(pinNames.get(i).equals(name.trim()))
        {
            result = true;
            break;
        }
    }
    return result;
}

}