Android------实现图片双击放大，缩小，左右滑动的多种方式

public class ViewPagerImageViewZQUI extends AppCompatActivity {

ViewPager viewPager;

private int[] mImgs = new int[] {
R.mipmap.img1,
R.mipmap.img2,
R.mipmap.tour
};
ImageView[] mImageViews;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.viewpager_layout);
initView();
}

private void initView(){
mImageViews= new ImageView[mImgs.length];
viewPager= (ViewPager) findViewById(R.id.img_viewpager);
viewPager.setAdapter(new PagerAdapter() {

@Override
public Object instantiateItem(ViewGroup container, int position) {
//可以使用其他的ImageView 控件，其他自定义控件，你也可以使用自己的哦
TounChImageView tounChImageView=new TounChImageView(ViewPagerImageViewZQUI.this);
try {
Picasso.with(ViewPagerImageViewZQUI.this).load(mImgs[position])
.placeholder(R.mipmap.img1)//默认显示的图片
// .resize(500,300)//控制图片高度，不添加则自适应
.error(R.mipmap.ic_launcher)//加载时出现错误显示的图片
.into(tounChImageView);
} catch (Exception e) {

}
//单击返回
tounChImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});

container.addView(tounChImageView,LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
mImageViews[position] = tounChImageView;
return tounChImageView;
}

@Override
public int getCount() {
return mImgs.length;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(mImageViews[position]);
}
@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == arg1;
}
});
}
}

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