Preface

This is a picture viewing library, which can realize the function of picture browsing, support the function of gesture or click zoom, support the use in ViewPager, and allow the application to notify the users on the photos to click
 Wechat's head image can be enlarged by clicking, and many App's image display can be realized by gesture pressing

usage method:

First add in the root build.gradle file

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

Then add the library in the module build.gradle

dependencies {
//Here's an explanation. The latest.release.here given in the official document is set according to the version
    implementation 'com.github.chrisbanes:PhotoView:latest.release.here'
}

Then xml layout

    <com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/photo_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />

Finally, call java file

PhotoView photoView = (PhotoView) findViewById(R.id.photo_view);
photoView.setImageResource(R.mipmap.ceshi);

In daily development, if it is used with viewpager, there will be problems. That's because the switch of viewpager and the zoom of photoview sometimes have gesture conflicts. When zooming, an exception will be reported. According to the prompts in the official document, you need to write a custom viewpager, rewrite onintercepttevent to solve the problem

//Rewrite this method to solve the conflict problem test.bawei.com.tupianousuofang.photoviewpager (the full name of the custom layout itself / / the name of the class)
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        try {
            return super.onInterceptTouchEvent(ev);
        } catch (IllegalArgumentException e) {
            //Write the error to be handled, including the error log
            e.printStackTrace();
            Log.e("TAG", "onInterceptTouchEvent: " );

            return false;
        }
    }

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private MyViewPager mVp;
    private List<View> list = new ArrayList<>();
    private int[] imgs = {R.mipmap.ceshi, R.mipmap.ceshi2, R.mipmap.ceshi3, R.mipmap.ceshi4};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initList();
        mVp = findViewById(R.id.mVp);
        mVp.setAdapter(new VPAdapter());


    }

    private void initList() {

        for (int i = 0; i < imgs.length; i++) {
            View v = View.inflate(MainActivity.this, R.layout.adapter, null);
            PhotoView photoView = v.findViewById(R.id.photo_view);
            photoView.setImageResource(imgs[i]);
            list.add(photoView);
        }
    }

    /**
     * Adapter
     **/
    public class VPAdapter extends PagerAdapter {
        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {

            return view == object;
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            int p = position % list.size();
            //Get the current photo
            PhotoView img = (PhotoView) list.get(p);
            //Get parent container for photos
            ViewParent parent = img.getParent();
            //If the parent container is not empty, delete the photos at the current location, and then proceed to the next step to add new photos
            if (parent != null) {
                ViewGroup vp = (ViewGroup) parent;
                vp.removeView(list.get(p));
            }
            container.addView(list.get(p));
            return list.get(p);
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            //      super.destroyItem(container, position, object);
//      container.removeView(list.get(position%list.size()));
        }
    }
}

MyViewPager.java

public class MyViewPager extends ViewPager {

    public MyViewPager(Context context) {
        super(context);
    }

    public MyViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        try {
            return super.onInterceptTouchEvent(ev);
        } catch (IllegalArgumentException e) {
            //This is what we want to deal with
            e.printStackTrace();
            Log.e("TAG", "onInterceptTouchEvent: " );

            return false;
        }
    }
}

summary

Wechat's head image can be enlarged by clicking, and many App's image display can be realized by gesture pressing

github address