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我設計了一個側邊欄，其中包含26個垂直字符。設計的文字在onDraw（）中根據需要使用畫布來支持所有屏幕
當我使用HVGA屏幕（模擬器）時，它適合屏幕，但它不適合其他屏幕。我在onDraw()方法中使用畫布設計了側邊欄。
如何將此邊欄適用於所有類型的屏幕？
private void init() {
float GESTURE_THRESHOLD_DP = 13.9f;
// Get the screen's density scale
float scale = getResources().getDisplayMetrics().density;
// Convert the dps to pixels, based on density scale
mGestureThreshold = (int) (GESTURE_THRESHOLD_DP * scale + 0.5f);
// Use mGestureThreshold as a distance in pixels...
l = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
setBackgroundColor(0x44FFFFFF);
}
public SideBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public void setListView(ListView _list) {
list = _list;
sectionIndexter = (SectionIndexer) _list.getAdapter();
}
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
int i = (int) event.getY();
System.out.println("i is:"+i);
int idx = i/m_nItemHeight;
if (idx >= l.length) {
idx = l.length - 1;
} else if (idx < 0) {
idx = 0;
}
if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {
if (sectionIndexter == null) {
sectionIndexter = (SectionIndexer) list.getAdapter();
}
int position = sectionIndexter.getPositionForSection(l[idx]);
if (position == -1) {
return true;
}
list.setSelection(position);
}
return true;
}
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
float f;
paint.setColor(Color.BLACK);
paint.setTextSize(18);
float scale = (float) getWidth();
System.out.println(""+Paint.FAKE_BOLD_TEXT_FLAG);
paint.setTextAlign(Paint.Align.CENTER);
paint.setAntiAlias(true);
float widthCenter = getMeasuredWidth() /2;
for (int i = 0; i < l.length; i++) {
canvas.drawText(String.valueOf(l[i]), widthCenter, m_nItemHeight + (i * m_nItemHeight), paint);
}
super.onDraw(canvas);
}
}