ViewParge(普通滑动)

最新推荐文章于 2022-07-13 16:25:24 发布

转载最新推荐文章于 2022-07-13 16:25:24 发布 · 226 阅读

本文介绍了一个简单的Android应用程序，该程序使用ViewPager组件展示了一系列相同的图片。通过自定义PagerAdapter，实现了图片的加载和滑动切换功能。

package com.example.day7huadongtupian;

import java.util.ArrayList;
import java.util.List;

import android.os.Bundle;
import android.app.Activity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

public class MainActivity extends Activity {

    private ViewPager pager;
    private List<ImageView> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pager = (ViewPager) findViewById(R.id.pages);


        initData();
        Mytu mytu = new Mytu();
        pager.setAdapter(mytu);
    }

    private void initData() {
        list = new ArrayList<ImageView>();
        for (int i = 0; i < 5; i++) {
            ImageView im = new ImageView(MainActivity.this);
            im.setBackgroundResource(R.drawable.ic_launcher);
            list.add(im);
        }
    }
    class Mytu extends PagerAdapter{

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            if (list != null) {
                return list.size();
            }
            return 0;
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            // TODO Auto-generated method stub
            return arg0 == arg1;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            // TODO Auto-generated method stub
            container.removeView((View) object);

        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            // TODO Auto-generated method stub
            container.addView(list.get(position));
            return list.get(position);
        }

    }

}