這個控件在android中的名稱是如何實現的？

Question

Answer 1

這是非標準控制。

我已經實現了它。我已經用簡單的方法完成了，只需要在ImageView上畫出所需的全部內容。

我的代碼看起來像這樣。它可以進一步改進（例如移動大小或xml佈局中的顏色定義），但是您可以從中獲得創意。並沒有考慮到設備屏幕的不同尺寸和密度。

/** 
* Padding between circles displaying position 
*/ 
private static final int PADDING = 20; 
/** 
* Radius of circles displaying position 
*/ 
private static final int RADIUS = 4; 
// Color of the selected element's indicator 
private int activeColor; 
// Color of the not selected element's indicator 
private int inactiveColor; 

// Call this in View constructor or in activity onCreate() 
Resources res = getResources(); 
activeColor = res.getColor(R.color.sliderActiveColor); 
inactiveColor = res.getColor(R.color.sliderInactiveColor); 

/** 
* Draws position of current element. 
* Call it on fling events. 
* @param currentPosition Current element position 
*/ 
protected void drawPosition(int currentPosition) { 
    // Control height 
    final int height = 20; 
    // Control width 
    final int bmpWidth = 200; 

    // Count of all elements 
    int count = viewFlipper.getChildCount(); 

    // Calculate first element position on canvas 
    float initialPosition = bmpWidth/2 - (count - 1) * (PADDING/2 + RADIUS); 
    final int shift = PADDING + 2 * RADIUS; 

    Bitmap bitmap = Bitmap.createBitmap(bmpWidth, height, Config.ARGB_8888); 

    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); 
    paint.setStyle(Style.FILL); 
    Canvas c = new Canvas(bitmap); 

    for (int i = 0; i < count; i++) { 
     // Draw circle for each element, current element with different color 
     if (i == currentPosition) { 
      paint.setColor(activeColor); 
     } else { 
      paint.setColor(inactiveColor); 
     } 
     c.drawCircle(initialPosition + i * shift, PADDING/2, RADIUS, paint); 
    } 

    // Draw on ImageView 
    sliderImage.setImageBitmap(bitmap); 
} 

而結果：