android 仿京东购物商城分类视图

package pw.f.food.jd; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.v4.app.Fragment; import android.util.Log; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * Created by djz on 2016/11/10. */ public class JDFragment extends Fragment { String TAG = "JDFragment"; private View rootView = null; private LinearLayout llayout_main = null; private TextView tv = null; private LinearLayout.LayoutParams lp_gd = null; private LinearLayout.LayoutParams lp_tv = null; private ArrayList<Category> itemList = null; private GDAdapter adapter = null; @Override public void onAttach(Activity activity) { Log.e(TAG, "onAttach..."); super.onAttach(activity); } @Override public void onCreate(Bundle savedInstanceState) { Log.e(TAG, "onCreate..."); super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { Log.e(TAG, "onCreateView..."); rootView = inflater.inflate(R.layout.jd_frg_main, null); llayout_main = (LinearLayout) rootView.findViewById(R.id.llayout_jd_frg_main); tv = (TextView) rootView.findViewById(R.id.tv_jd_frg_main); updateTitle(); //模拟数据 for(int i=0; i<2; i++) { setData(); } return rootView; } protected void updateTitle() { if(getArguments() != null) { updateTitle(getArguments().getString("name")); } } protected void updateTitle(String title) { if(tv != null) { tv.setText(title); } } private void setData() { if(itemList == null) { itemList = new ArrayList<Category>(); for(int i=1; i<11; i++) { itemList.add(new Category("选项 " + i, ""+i)); } } //高度60dp+行距8dp = 68dp int heightUnit = (int) TypedValue .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 68, getResources().getDisplayMetrics()); int height; //计算Gridview总高度 if(itemList.size() % 3 == 0) { height = (itemList.size()/3 + 2)*heightUnit; } else{ height = (itemList.size()/3 + 1)*heightUnit; } if(lp_gd == null) lp_gd = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height); if(lp_tv == null) lp_tv = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT , (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP , 30, getResources().getDisplayMetrics())); TextView tv_title = new TextView(getActivity()); tv_title.setLayoutParams(lp_tv); tv_title.setText("组一"); llayout_main.addView(tv_title); GridView gridView = new GridView(getActivity()); gridView.setNumColumns(3); gridView.setVerticalSpacing(8); gridView.setLayoutParams(lp_gd); adapter = new GDAdapter(getActivity(), itemList,R.mipmap.ic_launcher); gridView.setAdapter(adapter); llayout_main.addView(gridView); } @Override public void onActivityCreated(Bundle savedInstanceState) { Log.e(TAG, "onActivityCreated..."); super.onActivityCreated(savedInstanceState); } @Override public void onStart() { Log.e(TAG, "onStart..."); super.onStart(); } @Override public void onResume() { Log.e(TAG, "onResume..."); super.onResume(); } @Override public void onPause() { Log.e(TAG, "onPause..."); super.onPause(); } @Override public void onStop() { Log.e(TAG, "onStop..."); super.onStop(); } @Override public void onDestroyView() { Log.e(TAG, "onDestroyView..."); super.onDestroyView(); } @Override public void onDestroy() { Log.e(TAG, "onDestroy..."); super.onDestroy(); } @Override public void onDetach() { Log.e(TAG, "onDetach..."); super.onDetach(); } static class GDAdapter extends BaseAdapter { Context context; List<Category> results; int imageId; ViewHolder holder = null; public GDAdapter(Context context, List<Category> results, int imageId) { this.context = context; this.results = results; this.imageId = imageId; } @Override public int getCount() { // TODO Auto-generated method stub return results.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return results.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { Category c = (Category)getItem(position); if(convertView == null) { holder = new ViewHolder(); convertView = LayoutInflater.from(context).inflate(R.layout.jd_item, null); holder.tv = (TextView) convertView.findViewById(R.id.tv_jd_item); holder.imv = (ImageView) convertView.findViewById(R.id.imv_jd_item); } else { holder = (ViewHolder) convertView.getTag(); } convertView.setTag(holder); holder.tv.setText(c.getName()); holder.imv.setImageResource(imageId); return convertView; } class ViewHolder { TextView tv; ImageView imv; } } }