viewpager+photoview实现图片查看器

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:background="#000000"> 
 
 <android.support.v4.view.ViewPager 
 android:id="@+id/viewpager" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" /> 
 
 <TextView 
 android:id="@+id/tv_num" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:layout_centerHorizontal="true" 
 android:textColor="#ffffff" 
 android:textSize="30sp" /> 
 
</RelativeLayout> 

/** 
 * Created by zheng on 2017/11/27. 
 */ 
 
public class PhotoFragment extends Fragment { 
 
 private String url; 
 private PhotoView mPhotoView; 
 
 /** 
 * 获取这个fragment需要展示图片的url 
 * @param url 
 * @return 
 */ 
 public static PhotoFragment newInstance(String url) { 
 PhotoFragment fragment = new PhotoFragment(); 
 Bundle args = new Bundle(); 
 args.putString("url", url); 
 fragment.setArguments(args); 
 return fragment; 
 } 
 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 url = getArguments().getString("url"); 
 } 
 
 @Nullable 
 @Override 
 public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) { 
 View view = inflater.inflate(R.layout.fragment_img, container, false); 
 mPhotoView = view.findViewById(R.id.photoview); 
 //设置缩放类型，默认ScaleType.CENTER（可以不设置） 
 mPhotoView.setScaleType(ImageView.ScaleType.CENTER); 
 mPhotoView.setOnLongClickListener(new View.OnLongClickListener() { 
  @Override 
  public boolean onLongClick(View view) { 
  ToastUtils.showToast(getContext(),"长按事件"); 
  return true; 
  } 
 }); 
 mPhotoView.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() { 
  @Override 
  public void onPhotoTap(View view, float x, float y) { 
  ToastUtils.showToast(getContext(),"点击事件，真实项目中可关闭activity"); 
  } 
 }); 
 Glide.with(getContext()) 
  .load(url) 
  .placeholder(R.mipmap.ic_launcher)//加载过程中图片未显示时显示的本地图片 
  .error(R.mipmap.ic_launcher)//加载异常时显示的图片 
//  .centerCrop()//图片图填充ImageView设置的大小 
  .fitCenter()//缩放图像测量出来等于或小于ImageView的边界范围,该图像将会完全显示 
  .into(mPhotoView); 
 return view; 
 } 
 
} 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent"> 
 
 <uk.co.senab.photoview.PhotoView 
 android:id="@+id/photoview" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" /> 
 
</RelativeLayout> 

allprojects { 
 repositories { 
 maven { url "https://jitpack.io" } 
 } 
} 

dependencies { 
 compile 'com.github.chrisbanes.photoview:library:+' 
 compile 'com.github.bumptech.glide:glide:3.7.0' 
}