Android ViewPager和PagerAdapter简单代码写法

喜欢ヅ旅行 2023-10-17 22:06 7阅读 0赞

**Android ViewPager和PagerAdapter简单代码写法**

总是忘记，记下来备忘：

package zhangphil.test;
    
    import android.os.Bundle;
    import android.support.annotation.NonNull;
    import android.support.annotation.Nullable;
    import android.support.v4.view.PagerAdapter;
    import android.support.v4.view.ViewPager;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ImageView;
    
    import java.util.ArrayList;
    
    public class ViewPagerActivity extends AppCompatActivity {
        private ArrayList<ImageView> images = new ArrayList<>();
    
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.view_pager_activity);
    
            for (int i = 0; i < 5; i++) {
                ImageView imageView = new ImageView(getApplicationContext());
                imageView.setImageResource(R.mipmap.ic_launcher);
                images.add(imageView);
            }
    
            ViewPager viewPager = findViewById(R.id.view_pager);
            viewPager.setAdapter(new VPAdapter());
        }
    
        private class VPAdapter extends PagerAdapter {
    
            @Override
            public View instantiateItem(ViewGroup container, int position) {
                container.addView(images.get(position));
                return images.get(position);
            }
    
            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
                container.removeView(images.get(position));
            }
    
            @Override
            public int getCount() {
                return images.size();
            }
    
            @Override
            public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
                return view == object;
            }
        }
    }