subsamplingscaleimageview清潔針圖像

Question

我想在更改背景圖像時從我的PinView刪除所有針腳。 我通過將它們插入座標ArrayList和引腳圖像來添加引腳，並且一切正常。

我該怎麼辦？

Answer 1

你提到你已經有了一個arrayList中的Points。從下面使用setPin函數（它也需要一個「名稱」的點，你可以簡單地添加arrayList的點索引作爲名稱使用String.valueOf(//you index);作爲引腳的名稱）。現在，當你想刪除點時，只需爲arrayList運行一個簡單的for循環，並刪除所有元素。試一試。

P.S.該代碼還包含其他一些功能，如果您不需要，可隨時刪除它們。

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; 
} 

}