回転バナーを実装したい。そのようなUIに最適なコントロールは何ですか？
これがそれがする必要があることです：
つまり、基本的に最初のアクティビティに着地すると、最初のインデックスが表示されます。スワイプすると、スワイプが左か右かによって、次の画像または前の画像が表示されます。これは無限ループで繰り返されるはずです。
前もって感謝します
誰かが解決策を望んでいた場合のために、ここにコードがあります：
public class CustomBanner extends RelativeLayout {
//================================================================================
//==== declaration.
protected List<Banner> _items = new ArrayList<Banner>();
protected GestureDetector gestureDetector;
protected View.OnTouchListener gestureListener;
protected ImageView _banner = null;
protected String TAG = "CustomBanner";
//================================================================================
//================================================================================
//==== properties
/**
* This property pulls the banners from the state manager. If the banners are not there they will be pulled from the database.
* */
protected List<Banner> getBanners()
{
// get your banners however way you get them
return this._items;
}
//================================================================================
//================================================================================
//==== constructors
public CustomBanner(Context context, AttributeSet attributes)
{
super(context, attributes);
this.Init(context, attributes);
}
//================================================================================
//================================================================================
//==== protected methods
protected void Init(Context context, AttributeSet attributes)
{
//---- inflate our layout
LayoutInflater layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
layoutInflater.inflate(R.drawable.controls_custombanner, this);
this._banner = (ImageView)findViewById(R.id.imgBanner);
// swipe detection on the image
this.gestureDetector = new GestureDetector(new MyGestureDetector());
this.gestureListener = new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return true;
}
return false;
}
};
// leave this, it needs to be here in order to redirect the swipe correctly to touch gesture direction
this._banner.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// leave blank, click is redirected to gesture
}
});
this._banner.setOnTouchListener(gestureListener);
// set banner image
this.setBanner(this.getCurrentIndexByWndId());
}
protected int getCurrentIndexByWndId() {
// add your logic here
// you need to access your state to get the last saved id
}
/**
* this function does nothing but set the banner image by the position from the array of banners.
* */
protected void setBanner(int position)
{
_banner.setImageResource(this.getBanners().get(position).ResourceId);
}
/**
* this function tests the validity of the index in the banners array and resets it to 0 if its not valid.
* */
protected int checkValidIndex(int currentIndex){
if (currentIndex > this.getBanners().size()-1)
currentIndex = 0;
return currentIndex;
}
protected void processBannerClick(Banner clickedBanner){
try
{
// here do your logic for the click
}
catch (Exception ex)
{
Log.e(App.Current.getErrorTag(), ex.getMessage());
}
}
//================================================================================
//================================================================================
//==== helper classes
/**
* this is a helper class to detect the gesture or swipe. It uses the onFling() to test whether it was a right or left swipe.
* It increments the position of and sets the appropriate next image on the banner.
* */
protected class MyGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
Log.i(TAG, "BANNER: onFling() happened");
int currentIndex = 0;
try {
currentIndex = FromState.getCurrentAdRotatorPosition();
if(isScrollingLeft(e1, e2)) {
// left swipe
if (currentIndex > 0)
currentIndex --;
else currentIndex = getBanners().size()-1;
}
else {
// right swipe
if (currentIndex < getBanners().size()-1)
currentIndex ++;
else currentIndex = 0;
}
} catch (Exception e) {
// do nothing
}
FromState..setCurrentAdRotatorPosition(currentIndex);
setBanner(FromState.getCurrentAdRotatorPosition());
return false;
}
@Override
public boolean onSingleTapUp(MotionEvent ev)
{
Log.i(TAG, "BANNER: onSingleTapUp() happened");
processBannerClick(getBanners().get(FromState.getCurrentAdRotatorPosition()));
return false;
}
/** check if left swipe happened */
private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){
return e2.getX() > e1.getX();
}
}
//================================================================================
}
http://permalink.gmane.org/gmane.comp.handhelds.android.devel/101327このコードは、回転するonFlingビューの作成に役立つ場合があります。役に立たない機能を切り落とすだけで、ほぼ完了です。現在のバナーを記憶するには、おそらくバナークラスをシングルトーンとして作成し、そのインスタンスと状態をロードして、現在表示されているバナーを確認する必要があります。