在图像android之间滑动
作者:互联网
我对Android动画和手势比较陌生.
我有15张想要滑动的图像.屏幕上一次只显示一个图像,当我在第一张图像上滑动L-> R时,第二张图像显示,依此类推 – 就像幻灯片一样.我查看了Android Gallery教程,但我不希望显示缩略图.我的理解是使用ImageView并不断更改图像.这是正确的方法还是有更好的方法?
解决方法:
这样你就不会看到狡猾的效果.
有一种方法可以与画廊一起做.
像这样生活galery:
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/HorizontalGallery"
android:gravity="center_vertical" android:spacing="2px"/>
在getview上你必须:
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(_Context);
i.setImageResource(R.drawable.YourPicture);
i.setLayoutParams(new Gallery.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
//setting the scale:
int viewWidthtmp;
int viewHeighttmp;
if(getHeight() == 0)
{
if(_horizGallery.getWidth() == 0){
viewWidthtmp = _horizGallery.getWidth();
viewHeighttmp = _horizGallery.getHeight();
}
else
{
viewWidthtmp = _screenWidth;
viewHeighttmp = _screenHeight;
}
//getting the size of the image.
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true; //returns null, but fills the out methods
bm = BitmapFactory.decodeResource(getResources(), R.drawable.YourPicture, o);
if(o.outHeight> viewHeight || o.outWidth> viewWidth)
{i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);}
else
{i.setScaleType(ImageView.ScaleType.FIT_CENTER);}
//DO NOT ADD the line below
//i.setBackgroundResource(mGalleryItemBackground);
return i;
}
您还必须声明2个全局变量变量并在活动的OnCreate中初始化它们.
public class ScrollingGallery extends Activity
{
private int _screenWidth;
private int _screenHeight;
...
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.scrollingallery);
Display display = getWindowManager().getDefaultDisplay();
_screenWidth = display.getWidth();
_screenHeight = display.getHeight();
...
之后,您只需要使用计时器制作图库滚动.
如果我没有弄错的话,这应该适用于整页画廊.代码有点长,我只是写了它,所以可能有一个bug.
标签:android,gestures 来源: https://codeday.me/bug/20190614/1237605.html