Android 如何使用数据绑定转换ViewPager实现?
维护性:Android 如何使用数据绑定转换ViewPager实现?,android,data-binding,Android,Data Binding,维护性: public class MainActivity extends AppCompatActivity { private static int currentPage = 0; private static int NUM_PAGES = 0; CirclePageIndicator indicator; int Imageitems[] = {R.drawable.hike, R.drawable.hike, R.d
public class MainActivity extends AppCompatActivity {
private static int currentPage = 0;
private static int NUM_PAGES = 0;
CirclePageIndicator indicator;
int Imageitems[] = {R.drawable.hike, R.drawable.hike, R.drawable.hike};
final ArrayList<Integer> imageItems = new ArrayList<>();
ViewPager mPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPager = (ViewPager) findViewById(R.id.pager);
indicator = (CirclePageIndicator)
findViewById(R.id.indicator);
for (int i = 0; i < Imageitems.length; i++) {
imageItems.add(Imageitems[i]);
}
ImageSlider(imageItems);
}
private void ImageSlider(ArrayList<Integer> ImagesArray) {
mPager.setAdapter(new Item_SlidingImage_Adapter(this, ImagesArray));
indicator.setViewPager(mPager);
final float density = getResources().getDisplayMetrics().density;
indicator.setRadius(5 * density);
NUM_PAGES = ImagesArray.size();
// Auto start of viewpager
final Handler handler = new Handler();
final Runnable Update = new Runnable() {
public void run() {
if (currentPage == NUM_PAGES) {
currentPage = 0;
}
mPager.setCurrentItem(currentPage++, true);
}
};
Timer swipeTimer = new Timer();
swipeTimer.schedule(new TimerTask() {
@Override
public void run() {
handler.post(Update);
}
}, 3000, 3000);
// Pager listener over indicator
indicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
currentPage = position;
}
@Override
public void onPageScrolled(int pos, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int pos) {
}
});
}
}
public类MainActivity扩展了AppCompatActivity{
私有静态int currentPage=0;
私有静态int NUM_PAGES=0;
圆圈指示器;
int Imageitems[]={R.drawable.hike,R.drawable.hike,R.drawable.hike};
最终ArrayList imageItems=新ArrayList();
可视寻呼机;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPager=(ViewPager)findViewById(R.id.pager);
指示器=(CirclePageIndicator)
findViewById(R.id.指示器);
对于(int i=0;i
布局:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<data>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:id="@+id/relativelayout1"
android:layout_width="match_parent"
android:layout_height="150dp"
>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:addOnPageChangeListener="@{data.pageChangeListener}"
app:currentItem="@{data.currentPage}"
app:adapter="@{image_adapter}"
/>
<com.viewpagerindicator.CirclePageIndicator
android:id="@+id/indicator"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:padding="5dp"
app:centered="true"
app:fillColor="#ff0099"
app:pageColor="#FF0000"
app:radius="@{data.density}"
app:snap="false" />
</RelativeLayout>
</LinearLayout>
</layout>
适配器:
public class Item_SlidingImage_Adapter extends PagerAdapter {
private ArrayList<Integer> IMAGES;
private LayoutInflater inflater;
private Context context;
public Item_SlidingImage_Adapter(Context context, ArrayList<Integer> IMAGES) {
this.context = context;
this.IMAGES = IMAGES;
inflater = LayoutInflater.from(context);
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public int getCount() {
return IMAGES.size();
}
@Override
public Object instantiateItem(ViewGroup view, final int position) {
View imageLayout = inflater.inflate(R.layout.slidingimages_layout, view, false);
assert imageLayout != null;
final ImageView imageView = (ImageView) imageLayout
.findViewById(R.id.image);
imageView.setImageResource(IMAGES.get(position));
view.addView(imageLayout, 0);
return imageLayout;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view.equals(object);
}
@Override
public void restoreState(Parcelable state, ClassLoader loader) {
}
@Override
public Parcelable saveState() {
return null;
}
}
公共类项目\u滑动图像\u适配器扩展PagerAdapter{
私有数组列表图像;
私人充气机;
私人语境;
公共项\u滑动图像\u适配器(上下文上下文、ArrayList图像){
this.context=上下文;
这个。图像=图像;
充气器=充气器。从(上下文);
}
@凌驾
公共项(视图组容器、int位置、对象){
container.removeView((视图)对象);
}
@凌驾
public int getCount(){
返回图像。size();
}
@凌驾
公共对象实例化项(视图组视图,最终int位置){
查看图像布局=充气机。充气(R.layout.slidingimages\u布局,视图,false);
断言imageLayout!=null;
最终图像视图图像视图=(图像视图)图像布局
.findviewbyd(R.id.image);
setImageResource(IMAGES.get(position));
view.addView(imageLayout,0);
返回图像布局;
}
@凌驾
公共布尔值isViewFromObject(视图,对象){
返回视图.equals(对象);
}
@凌驾
公共无效恢复状态(可包裹状态,类装入器){
}
@凌驾
公共包裹存储状态(){
返回null;
}
}
item.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="1dip" >
<ImageView
android:id="@+id/image"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:adjustViewBounds="true"
android:layout_gravity="center"
android:scaleType="fitXY" />
</FrameLayout>
使用给定的代码,我可以在ViewPager
中自动翻页,也可以在一定的延迟下手动使用。我必须使用数据绑定
转换相同的代码;我试过了,但我无法理解如何设置适配器、currentitem和页面更改侦听器,以及如何在xml中设置值
如何转换Android中用于数据绑定的现有代码?现在您没有在xml中定义任何变量(因此也没有将任何对象实例绑定到该变量)。请参阅,以获得外观极佳(但未经我测试)的答案。这对你来说可能是一个很好的起点。@mhanazsyed你知道怎么做了吗?因为我被困在同一个地方