viewPager-基本实现示例

最新推荐文章于 2025-09-05 16:34:31 发布

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最新推荐文章于 2025-09-05 16:34:31 发布

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文章标签：移动开发 java

原文链接：http://www.cnblogs.com/zhangshuli-1989/p/zhangshuli_exam_150331102.html

本文提供了一个关于Android中ViewPager组件使用的示例代码。通过自定义PagerAdapter来实现图片轮播效果，代码展示了如何加载图片资源、设置ViewPager的适配器及转换效果等关键步骤。

直接看代码

package com.example.myviewpager;

import android.app.Activity;
import android.os.Bundle;
import java.util.ArrayList;
import java.util.List;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class MainActivity extends Activity {
    private ViewPager mViewPager;
    private int[] mImgIds = new int[] { R.drawable.background_portrait,
            R.drawable.background, R.drawable.bg_vidcontrol };
    private List<ImageView> mImageViews = new ArrayList<ImageView>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);

        initData();

        mViewPager = (ViewPager) findViewById(R.id.id_viewpager);

        mViewPager.setAdapter(new PagerAdapter() {
            @Override
            public Object instantiateItem(ViewGroup container, int position) {

                container.addView(mImageViews.get(position));
                return mImageViews.get(position);
            }

            @Override
            public void destroyItem(ViewGroup container, int position,
                    Object object) {

                container.removeView(mImageViews.get(position));
            }

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

            @Override
            public int getCount() {
                return mImgIds.length;
            }
        });
        mViewPager.setPageTransformer(true, new DepthPageTransformer());

    }

    private void initData() {
        for (int imgId : mImgIds) {
            ImageView imageView = new ImageView(getApplicationContext());
            imageView.setScaleType(ScaleType.CENTER_CROP);
            imageView.setImageResource(imgId);
            mImageViews.add(imageView);
        }
    }
    
}