Android轮播图点击图片放大效果的实现方法

implementation 'com.youth.banner:banner:1.4.9'
implementation 'com.github.bumptech.glide:glide:4.5.0'
implementation 'com.commit451:PhotoView:1.2.4'

public class MainActivity extends AppCompatActivity implements OnBannerListener {

private Banner banner;
private ArrayList list_path;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

initView();
initData();
initListener();
}

private void initView() {
banner = findViewById(R.id.banner);
}

private void initData() {
setBanner();//设置轮播图
}

private void initListener() {

}

/**
* 设置轮播图
*/
private void setBanner() {
//放图片地址的集合
list_path = new ArrayList<>();
//设置图片数据
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/2a919def19fc47e3aa0d75d8c227ab1b.jpg");
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/d027d1efc0564c44bb979ba0bd21f560.jpg");
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/bbb930d66e5a48baa8d3c143544d7631.jpg");
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/fb1721b8c9be4da9949fcdd26fc902a2.jpg");
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/08b58dde9b284638b44e2d03c4cb9acf.jpg");
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/d3caeb6129ee43df87f5c1e1058d96fc.jpg");
list_path.add("https://sami-1256315447.picgz.myqcloud.com/article/201908/9fd01c4add07473db31ba850f20a7232.jpg");
list_path.add("http://a.hiphotos.baidu.com/image/pic/item/00e93901213fb80e3b0a611d3fd12f2eb8389424.jpg");

//设置内置样式，共有六种可以点入方法内逐一体验使用。
banner.setBannerStyle(BannerConfig.NUM_INDICATOR);
//设置图片加载器，图片加载器在下方
banner.setImageLoader(new ImgLoader());
//设置图片网址或地址的集合
banner.setImages(list_path);
//设置轮播的动画效果，内含多种特效，可点入方法内查找后内逐一体验
banner.setBannerAnimation(Transformer.Default);
//设置轮播间隔时间
banner.setDelayTime(3000);
//设置是否为自动轮播，默认是“是”
banner.isAutoPlay(true);
//设置指示器的位置，小点点，左中右。
banner.setIndicatorGravity(BannerConfig.CENTER)
//以上内容都可写成链式布局，这是轮播图的监听。比较重要。方法在下面。
.setOnBannerListener(this)
//必须最后调用的方法，启动轮播图。
.start();
}

//轮播图的监听方法
@Override
public void OnBannerClick(int position) {
Intent intent = new Intent(this, BigImgActivity.class);
intent.putStringArrayListExtra("imgData", list_path);
intent.putExtra("clickPosition", position);
startActivity(intent);
}

//自定义的图片加载器
private class ImgLoader extends ImageLoader {
@Override
public void displayImage(Context context, Object path, ImageView imageView) {
Glide.with(context).load((String) path).into(imageView);
}
}
}

public class BigImgActivity extends AppCompatActivity {
private ViewPagerFixed viewPager;
private TextView tvNum;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_big_img);
initView();
}

private void initView() {
viewPager = findViewById(R.id.viewpager);
tvNum = findViewById(R.id.tv_num);

//接收图片数据及位置
final ArrayList imgData = getIntent().getStringArrayListExtra("imgData");
int clickPosition = getIntent().getIntExtra("clickPosition", 0);

//添加适配器
PhotoPagerAdapter viewPagerAdapter = new PhotoPagerAdapter(getSupportFragmentManager(), imgData);
viewPager.setAdapter(viewPagerAdapter);
viewPager.setCurrentItem(clickPosition);//设置选中图片位置

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
tvNum.setText(String.valueOf(position + 1) + "/" + imgData.size());
}

@Override
public void onPageSelected(int position) {
}

@Override
public void onPageScrollStateChanged(int state) {

}
});
}
}

/**
* 滑动图片ViewPager适配器
*/
public class PhotoPagerAdapter extends FragmentPagerAdapter {

private final ArrayList urlList;

public PhotoPagerAdapter(FragmentManager fm, ArrayList urlList) {
super(fm);
this.urlList=urlList;
}

@Override
public Fragment getItem(int position) {
return PhotoFragment.newInstance(urlList.get(position));
}

@Override
public int getCount() {
return urlList.size();
}
}

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);

//长按事件
mPhotoView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
//Toast.makeText(getActivity(), "长按事件", Toast.LENGTH_SHORT).show();
return true;
}
});

//点击事件
mPhotoView.setOnPhotoTapListener(new PhotoViewAttacher.OnPhotoTapListener() {
@Override
public 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;
}
}

java.lang.IllegalArgumentException: pointerIndex out of range

public class ViewPagerFixed extends android.support.v4.view.ViewPager {

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

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

@Override
public boolean onTouchEvent(MotionEvent ev) {
try {
return super.onTouchEvent(ev);
} catch (IllegalArgumentException ex) {
ex.printStackTrace();
}
return false;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
try {
return super.onInterceptTouchEvent(ev);
} catch (IllegalArgumentException ex) {
ex.printStackTrace();
}
return false;
}
}

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