Android 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<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; } } }