Java 带有Viewpager的对话框中出现错误
我正在尝试从“回收器查看图像”单击打开一个对话框…该对话框包含一个用于创建滑动视图库的Viewpager 打开对话框的代码Java 带有Viewpager的对话框中出现错误,java,android,android-fragments,Java,Android,Android Fragments,我正在尝试从“回收器查看图像”单击打开一个对话框…该对话框包含一个用于创建滑动视图库的Viewpager 打开对话框的代码 holder.image.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final Dialog dialog = new Dialog(holder.itemVi
holder.image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Dialog dialog = new Dialog(holder.itemView.getContext());
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setCanceledOnTouchOutside(false);
dialog.setCancelable(true);
dialog.setContentView(R.layout.activity_fullscreen_image);
ImageView back=(ImageView)dialog.findViewById(R.id.back);
ViewPager viewPagerPhotoSlideShow = (ViewPager) dialog.findViewById(R.id.pager);
ArrayList<String> pagerListItems=new ArrayList<String>();
pagerListItems.add(0,"https://firebasestorage.googleapis.com/v0/b/zumi-60a8f.appspot.com/o/Chat_Images%2Fcropped-1222406361.png?alt=media&token=22b8673f-5602-48d4-980f-986d505d2d8f");
pagerListItems.add(1,"https://firebasestorage.googleapis.com/v0/b/zumi-60a8f.appspot.com/o/Chat_Images%2Fcropped1611377016.png?alt=media&token=e7a40c6c-35ad-48ee-80ca-656384fcf68c");
FullScreenImageAdapter adapterPhotoViewPager = new FullScreenImageAdapter(dialog.getOwnerActivity(), pagerListItems);
viewPagerPhotoSlideShow.setAdapter(adapterPhotoViewPager);
viewPagerPhotoSlideShow.setCurrentItem(0);
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.cancel();
}
});
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
lp.copyFrom(dialog.getWindow().getAttributes());
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.MATCH_PARENT;
lp.gravity = Gravity.CENTER;
Window window = dialog.getWindow();
window.setAttributes(lp);
window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
dialog.show();
}
});
holder.image.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
最终对话框=新对话框(holder.itemView.getContext());
对话框.requestWindowFeature(窗口.FEATURE\u无\u标题);
对话框。setCanceledOnTouchOutside(false);
对话框。可设置可取消(true);
setContentView(R.layout.activity\u全屏图像);
ImageView back=(ImageView)dialog.findViewById(R.id.back);
ViewPager viewPagerPhotoSlideShow=(ViewPager)dialog.findViewById(R.id.pager);
ArrayList pagerListItems=新的ArrayList();
pagerListItems.add(0,“https://firebasestorage.googleapis.com/v0/b/zumi-60a8f.appspot.com/o/Chat_Images%2Fcropped-1222406361.png?alt=媒体和令牌=22b8673f-5602-48d4-980f-986d505d2d8f”);
pagerListItems.add(1,“https://firebasestorage.googleapis.com/v0/b/zumi-60a8f.appspot.com/o/Chat_Images%2Fcropped1611377016.png?alt=media&token=e7a40c6c-35ad-48ee-80ca-656384fcf68c”);
FullScreenImageAdapter AdapterPhotoviewPage=新的FullScreenImageAdapter(dialog.getOwnerActivity(),pagerListItems);
设置适配器(adapterPhotoViewPager);
ViewPagePhotoSlideshow.setCurrentItem(0);
back.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
dialog.cancel();
}
});
WindowManager.LayoutParams lp=新建WindowManager.LayoutParams();
lp.copyFrom(dialog.getWindow().getAttributes());
lp.width=WindowManager.LayoutParams.MATCH\u父项;
lp.height=WindowManager.LayoutParams.MATCH\u父项;
lp.重心=重心;
Window=dialog.getWindow();
设置属性(lp);
窗。可倒进地面拉深(新彩色拉深(彩色。透明));
dialog.show();
}
});
适配器代码:
public class FullScreenImageAdapter extends PagerAdapter {
private Activity _activity;
private ArrayList<String> _imagePaths;
private LayoutInflater inflater;
// constructor
public FullScreenImageAdapter(Activity activity,
ArrayList<String> imagePaths) {
this._activity = activity;
this._imagePaths = imagePaths;
}
@Override
public int getCount() {
return this._imagePaths.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == ((RelativeLayout) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imgDisplay;
// Button btnClose;
inflater = (LayoutInflater) _activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View viewLayout = inflater.inflate(R.layout.layout_fullscreen_image_each, container,
false);
imgDisplay = (ImageView) viewLayout.findViewById(R.id.imgDisplay);
Glide.with(container.getContext()).load(_imagePaths.get(0))
.priority(Priority.HIGH).animate(android.R.anim.fade_in)
.override(120, 87).fitCenter().skipMemoryCache(false)
.diskCacheStrategy(DiskCacheStrategy.RESULT)
.into(imgDisplay);
((ViewPager) container).addView(viewLayout);
return viewLayout;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView((RelativeLayout) object);
}
}
公共类FullScreenImageAdapter扩展了PagerAdapter{
私人活动;
私有ArrayList_ImagePath;
私人充气机;
//建造师
公共FullScreenImageAdapter(活动,
ArrayList图像路径){
这个。_活动=活动;
这是。_imagepath=imagepath;
}
@凌驾
public int getCount(){
返回此项。_imagepath.size();
}
@凌驾
公共布尔值isViewFromObject(视图,对象){
返回视图==((RelativeLayout)对象);
}
@凌驾
公共对象实例化项(视图组容器,int位置){
图像视图imgDisplay;
//按钮关闭;
充气器=(充气器)\u活动
.getSystemService(上下文布局\充气机\服务);
视图布局=充气机。充气(R.layout.layout\u全屏\u图像\u每个容器,
假);
imgDisplay=(ImageView)viewLayout.findViewById(R.id.imgDisplay);
Glide.with(container.getContext()).load(_imagepath.get(0))
.priority(priority.HIGH).动画(android.R.anim.fade_in)
.override(120,87).fitCenter().skipMemoryCache(false)
.diskCacheStrategy(diskCacheStrategy.RESULT)
.into(imgDisplay);
((ViewPager)容器)。添加视图(viewLayout);
返回视图布局;
}
@凌驾
公共项(视图组容器、int位置、对象){
((ViewPager)容器)。移除视图((RelativeLayout)对象);
}
}
XML>>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:layout_width="30dp"
android:layout_height="30dp"
android:src="@drawable/arrow"
android:rotation="180"
android:id="@+id/back"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
每个视图的XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imgDisplay"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="fitCenter" />
</RelativeLayout>
错误>>>
E/AndroidRuntime:致命异常:主
进程:com.example.cosmic.zumi_test,PID:22289
java.lang.NullPointerException:尝试调用虚拟方法
'java.lang.Object
空值上的android.content.Context.getSystemService(java.lang.String)“”
对象引用
位于android.view.LayoutInflater.from(LayoutInflater.java:219)
在
com.example.cosmic.zumi_test.FullScreenImageAdapter.InstanceItem(FullScreenImageAdapter.java:56)
位于android.support.v4.view.ViewPager.addNewItem(ViewPager.java:1034)
位于android.support.v4.view.ViewPager.populate(ViewPager.java:1182)
位于android.support.v4.view.ViewPager.populate(ViewPager.java:1116)
在android.support.v4.view.ViewPager.onMeasure上(ViewPager.java:1642)
在android.view.view.measure(view.java:17572)
位于android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5604)
在
widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
LayoutInflater inflater = LayoutInflater.from(container.getContext());
FullScreenImageAdapter adapterPhotoViewPager = new FullScreenImageAdapter(v.getContext(), pagerListItems);
@Override
public Object instantiateItem(ViewGroup container, int position) {
ImageView imgDisplay;
// Button btnClose;
inflater = (LayoutInflater) _activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View viewLayout = inflater.inflate(R.layout.layout_fullscreen_image_each, container,
false);
imgDisplay = (ImageView) viewLayout.findViewById(R.id.imgDisplay);
Glide.with(container.getContext()).load(_imagePaths.get(position))
.priority(Priority.HIGH).animate(android.R.anim.fade_in)
.override(120, 87).fitCenter().skipMemoryCache(false)
.diskCacheStrategy(DiskCacheStrategy.RESULT)
.into(imgDisplay);
((ViewPager) container).addView(viewLayout);
return viewLayout;
}