ViewPage实现轮播图

最新推荐文章于 2019-07-11 16:48:02 发布

原创最新推荐文章于 2019-07-11 16:48:02 发布 · 662 阅读

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#实现viewPage轮播图

本文介绍如何在Android应用中实现从Fragment中图片点击事件触发跳转到另一个Activity，并展示如何在目标Activity中使用ViewPager加载并显示传入的图片列表。通过Intent传递图片位置和列表数据，在目标Activity中解析并利用ViewPagerAdatper自定义适配器展示图片。

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1.在fragment中写点击事件，当点击图片的时候让它跳转
Intent intent = new Intent(getContext(), Main3Activity.class);
intent.putExtra(“position”,position);
intent.putStringArrayListExtra(“list”,ls);
startActivity(intent);

2.在MainActivity中获取你传过来的值
public class Main3Activity extends AppCompatActivity implements ViewPager.OnPageChangeListener {

private TextView tv;
private ViewPager viewpager;
private ArrayList<String> list;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main3);
    initView();
}

private void initView() {
    tv = (TextView) findViewById(R.id.tv);
    viewpager = (ViewPager) findViewById(R.id.viewpager);

    Intent intent = getIntent();
    int position = intent.getIntExtra("position", 0);
    list = intent.getStringArrayListExtra("list");

    tv.setText(position+1+"/"+ list.size());

    ViewPagerAdatper adatper = new ViewPagerAdatper(this, list);
    viewpager.setAdapter(adatper);

    //viewpager默认显示
    viewpager.setCurrentItem(position);
    //监听事件
    viewpager.addOnPageChangeListener(this);
}

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

}

@Override
public void onPageSelected(int position) {
    tv.setText(position+1+"/"+list.size());
}

@Override
public void onPageScrollStateChanged(int state) {

}

}
3.定义自己的适配器ViewPagerAdatper继承PagerAdapter
public class ViewPagerAdatper extends PagerAdapter {

private Context context;
private ArrayList<String> list;

public ViewPagerAdatper(Context context, ArrayList<String> list) {
    this.context = context;
    this.list = list;
}

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

@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
    return view == object;
}

@Override
public Object instantiateItem(ViewGroup container, int position) {
    String url = list.get(position);
    ImageView photoView = new ImageView(context);
    Glide.with(context)
            .load("http:"+url)
            .into(photoView);
    //添加视图
    container.addView(photoView);
    return photoView;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    //移除视图
    container.removeView((View) object);
}

}