主要为了记录自己的学习成果，复盘学习的内容，免得第二天自己写了什么都忘了。
今天主要做了一个ViewPager的demo，写了一个适配器。
public class ImagePagerAdapter extends PagerAdapter {
private Context mContent;
private ArrayList<ImageView> mViewList=new ArrayList<ImageView>();
private ArrayList<GoodsInfo> mGoodsList=new ArrayList<GoodsInfo>();
public ImagePagerAdapter(Context mContent, ArrayList<GoodsInfo> mGoodsList) {
this.mContent = mContent;
this.mGoodsList = mGoodsList;
for(int i=0;i<mGoodsList.size();i++){
ImageView view=new ImageView(mContent);
view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));
view.setImageResource(mGoodsList.get(i).pic);
view.setScaleType(ImageView.ScaleType.FIT_CENTER);
mViewList.add(view);
}
}
@Override
public int getCount() {
return mViewList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(mViewList.get(position));
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(mViewList.get(position));
return mViewList.get(position);
}
}1，主要注意setLayoutParams的写法。
在Activity下加载，写一个监听事件。
public class MainActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener {
private ArrayList<GoodsInfo> mgoodsList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewPager vp_content=findViewById(R.id.vp_content);
mgoodsList=GoodsInfo.getDefaultList();
ImagePagerAdapter adapter=new ImagePagerAdapter(this,mgoodsList);
vp_content.setAdapter(adapter);
vp_content.setCurrentItem(0);
vp_content.addOnPageChangeListener(this);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
Toast.makeText(this,"你选择的手机是"+mgoodsList.get(position).name,Toast.LENGTH_SHORT).show();
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
随时随地看视频
