Android中使用PhotoView和ViewPager查看图片，并保存到本地

如下图：可以滑动查看，可以放大缩小，点击长按保存图片

build.gradle中添加依赖

compile 'com.github.chrisbanes.photoview:library:+'//glide
compile 'com.github.bumptech.glide:glide:3.7.0'

外部 build.gradle

allprojects {repositories {jcenter()//PhotoViewmaven { url "https://jitpack.io" }}
}

main布局文件

<?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"android:background="#000000"android:orientation="vertical"><android.support.v4.view.ViewPagerandroid:id="@+id/viewpager"android:layout_width="match_parent"android:layout_height="match_parent" /><TextViewandroid: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>

MainActivity

public class MainActivity extends AppCompatActivity {private List<Fragment> fragmentList = new ArrayList<>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ViewPager viewpager = (ViewPager) findViewById(R.id.viewpager);final TextView tv_num = (TextView) findViewById(R.id.tv_num);Fragment fragment1 = PhotoFragment.newInstance("http://img1.3lian.com/2015/w22/87/d/105.jpg");Fragment fragment2 = PhotoFragment.newInstance("http://a3.topitme.com/0/d0/f1/1128126520d81f1d00o.jpg");Fragment fragment3 = PhotoFragment.newInstance("http://pic30.nipic.com/20130605/7447430_151725918000_2.jpg");Fragment fragment4 = PhotoFragment.newInstance("http://img1.3lian.com/2015/a1/46/d/100.jpg");Fragment fragment5 = PhotoFragment.newInstance("http://img2.imgtn.bdimg.com/it/u=294543409,575604841&fm=26&gp=0.jpg");Fragment fragment6 = PhotoFragment.newInstance("http://pic28.photophoto.cn/20130809/0036036894761435_b.jpg");fragmentList.add(fragment1);fragmentList.add(fragment2);fragmentList.add(fragment3);fragmentList.add(fragment4);fragmentList.add(fragment5);fragmentList.add(fragment6);tv_num.setText(1+"/"+fragmentList.size());PhotoFragmentAdapter adapter = new PhotoFragmentAdapter(getSupportFragmentManager(),fragmentList);viewpager.setAdapter(adapter);viewpager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {tv_num.setText(position+1+"/"+fragmentList.size());}@Overridepublic void onPageScrollStateChanged(int state) {}});viewpager.setCurrentItem(2);}
}

PhotoFragment

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;}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);url = getArguments().getString("url");}@Nullable@Overridepublic View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable 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() {@Overridepublic boolean onLongClick(View view) {//Toast.makeText(getActivity(),"长按事件"+url,Toast.LENGTH_SHORT).show();mPhotoView.setDrawingCacheEnabled(true);Bitmap obmp = Bitmap.createBitmap(mPhotoView.getDrawingCache());mPhotoView.setDrawingCacheEnabled(false);saveMyBitmap(getActivity(), obmp);return true;}});mPhotoView.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() {@Overridepublic void onPhotoTap(View view, float x, float y) {Toast.makeText(getActivity(),"点击事件，真实项目中可关闭activity",Toast.LENGTH_SHORT).show();getActivity().finish();}});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;}//保存文件到指定路径public void saveMyBitmap(Context context, Bitmap bitmap) {String sdCardDir = Environment.getExternalStorageDirectory() + "/DCIM/";File appDir = new File(sdCardDir, "HappyBirthday");if (!appDir.exists()) {//不存在appDir.mkdir();}String fileName = "HappyBirthday" + System.currentTimeMillis() + ".jpg";File file = new File(appDir, fileName);try {FileOutputStream fos = new FileOutputStream(file);bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);fos.flush();fos.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);Uri uri = Uri.fromFile(file);intent.setData(uri);getActivity().sendBroadcast(intent);Toast.makeText(getActivity(),"图片保存成功",Toast.LENGTH_SHORT).show();}}

PhotoFragmentAdapter

public class PhotoFragmentAdapter extends FragmentPagerAdapter{private List<Fragment> fragmentList;public PhotoFragmentAdapter(FragmentManager fm,List<Fragment> fragmentList) {super(fm);this.fragmentList = fragmentList;}@Overridepublic Fragment getItem(int position) {return fragmentList.get(position);}@Overridepublic int getCount() {return fragmentList.size();}
}

fragment_img布局

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

最后别忘了权限

<uses-permission android:name="android.permission.INTERNET"></uses-permission><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>

完成

源码地址：https://download.csdn.net/download/changyiqiang/10745762

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