乐学成语——显示所有动物类成语的列表

        其实显示所有动物类成语的列表和显示学习列表的实现差不多，无非就是自定义适配器的使用，就不再进行详细论述。

1.显示所有动物类成语列表的操作实现后，需要修改StudyActivity中的点击事件。

<span style="font-size:18px;">package com.example.happyidiom;import java.util.ArrayList;import java.util.List;import com.edu.happyidiom.adapter.CategoryAdapter;import com.edu.happyidiom.entity.Category;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.content.res.Resources;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.Toast;public class StudyActivity extends Activity {private List<Category> categoryList;    private String[] category_names;    private int[] category_images;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_study);initCategory();CategoryAdapter adapter=new CategoryAdapter(this, R.layout.category_item, categoryList);ListView listView=(ListView) findViewById(R.id.lvCategories);    listView.setAdapter(adapter);    listView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int position,long id) {// TODO Auto-generated method stubswitch(position){case 0:Intent intent=new Intent(StudyActivity.this,StudyAnimalActivity.class);startActivity(intent);break;default:break;}}});}private void initCategory() {// TODO Auto-generated method stubcategoryList=new ArrayList<Category>();Resources resources=getResources();category_names=resources.getStringArray(R.array.category);category_images=new int[]{R.drawable.category_animal,R.drawable.category_nature,R.drawable.category_human,R.drawable.category_season,R.drawable.category_number,R.drawable.category_fable,R.drawable.category_other};for(int i=0;i<category_names.length;i++){categoryList.add(new Category(category_names[i], category_images[i]));}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.study, menu);return true;}}</span>

                                                    此时的界面

                                                                                             

2.此事点击收藏按钮没有任何反应，我们来处理一下点击事件。

<span style="font-size:18px;">package com.edu.happyidiom.adapter;import java.util.List;import com.edu.happyidiom.adapter.CategoryAdapter.ViewHolder;import com.edu.happyidiom.entity.Animal;import com.edu.happyidiom.entity.Category;import com.example.happyidiom.R;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.TextView;import android.widget.Toast;public class AnimalAdapter extends ArrayAdapter<Animal> {private int resourceld;    private Context context;public AnimalAdapter(Context context, int resource,List<Animal> objects) {super(context, resource, objects);// TODO Auto-generated constructor stubthis.context=context;resourceld=resource;}    public View getView(int position,View convertView,ViewGroup parent){    final Animal animal=getItem(position);    View view;    ViewHolder viewHolder;    if(convertView==null){    view=LayoutInflater.from(getContext()).inflate(resourceld, null);    viewHolder=new ViewHolder();    viewHolder.tvName= (TextView) view.findViewById(R.id.tvName);viewHolder.btnSave= (ImageButton) view.findViewById(R.id.btnStar);viewHolder.btnSave.setFocusable(false);viewHolder.btnSave.setFocusableInTouchMode(false);viewHolder.btnSave.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubToast.makeText(context, "你要收藏吗"+animal.getName()+"吗", Toast.LENGTH_SHORT).show();}});view.setTag(viewHolder);    }else{    view=convertView;    viewHolder=(ViewHolder) view.getTag();    }        viewHolder.tvName.setText(animal.getName());    return view;}    class ViewHolder{    TextView tvName;    ImageButton btnSave;    }}</span>

                              然后重新运行一下程序，此时的界面为