ArrayAdapter的使用

1. ArrayAdapter中需要重写getView()方法，在getView方法中，填充Layout并绑定数据。上下文可以通过构造函数传过来，也可以用ViewGroup parent。
2. TextView中的setText方法，不能传递int类型数据，可以先把类型数据转化成String类型。转化方法为int+""。

public class FruitAdapter extends ArrayAdapter<Fruit> {
    private int resource;
    private List<Fruit> data;
    private Context context;

    public FruitAdapter(Context context, int resource, List<Fruit> data) {
        super(context, resource, data);
        this.resource=resource;
        this.data=data;
        this.context=context;
    }

    @NonNull
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view= LayoutInflater.from(context).inflate(resource,null);
        TextView tv_name=(TextView) view.findViewById(R.id.tv_name);
        TextView tv_age=(TextView) view.findViewById(R.id.tv_age);
        tv_name.setText("Fruint Name:"+data.get(position).getName());
        tv_age.setText("Pirce:"+data.get(position).getAge());

        return view;
    }
}

package finishactivity.zhangmeng.com.listviewdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;import java.util.List;

public class MainActivity extends AppCompatActivity {
    private List<Fruit> data=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Fruit apple=new Fruit("apple",30);
        Fruit peach=new Fruit("peach",40);
        Fruit banana=new Fruit("Banana",30);
        Fruit grape=new Fruit("grape",10);
        data.add(apple);
        data.add(peach);
        data.add(banana);
        data.add(grape);
        ListView lv=(ListView)findViewById(R.id.lv);
        //lv.setAdapter(new FruitAdapter(this,R.layout.item,data));
        lv.setAdapter(new Myadapter(data));
       // lv.getOnItemClickListener(new AdapterView.OnItemClickListener());
    }
}