Android(安卓)ViewPager和PagerAdapter简单代码写法

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 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;        }    }}

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