android如何实现图片滑动-乐工具技术知识

在Android中，要实现图片滑动，可以使用ViewPager和RecyclerView。这里我们使用ViewPager来实现图片滑动。

首先，在build.gradle文件中添加依赖：

dependencies {
    implementation 'com.android.support:support-v4:28.0.0'
}

在res/layout目录下创建一个新的布局文件activity_image_slider.xml，并添加ViewPager：

创建一个新的Java类ImageSliderActivity，并在其中设置ViewPager的适配器：

import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;

import android.os.Bundle;

public class ImageSliderActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private int[] imageResources = {R.drawable.image1, R.drawable.image2, R.drawable.image3};

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

        viewPager = findViewById(R.id.viewPager);
        viewPager.setAdapter(new ImageSlideAdapter(this, imageResources));
    }
}

创建一个新的Java类ImageSlideAdapter，继承自PagerAdapter，并实现其方法：

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.viewpager.widget.PagerAdapter;

public class ImageSlideAdapter extends PagerAdapter {

    private Context context;
    private int[] imageResources;
    private LayoutInflater inflater;

    public ImageSlideAdapter(Context context, int[] imageResources) {
        this.context = context;
        this.imageResources = imageResources;
        inflater = LayoutInflater.from(context);
    }

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

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

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        View imageLayout = inflater.inflate(R.layout.image_slide, container, false);
        ImageView imageView = imageLayout.findViewById(R.id.image);
        imageView.setImageResource(imageResources[position]);
        container.addView(imageLayout);
        return imageLayout;
    }

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