这个是代码，我都是照着示例做的，但还是不行，查了一天了，到底是哪里出问题呢
万分感谢

package cn.com.ava.lesson4_fancy_view;

import android.content.Context;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

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

import cn.com.ava.lesson4_fancy_view.Model.Address;

public class MainActivity extends Activity {

    private EditText et_name;
    private EditText et_address;
    private Button bt_save;
    private RadioGroup rg_types;
    private RadioButton rb_take_out;
    private RadioButton rb_sit_down;
    private RadioButton rb_delivery;
    private ListView lv_address;

    private ArrayAdapter<Address> adapter;
    private List<Address> listAddress = new ArrayList<Address>();

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.bt_save = (Button) this.findViewById(R.id.bt_save);
        this.bt_save.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                et_name = (EditText) MainActivity.this.findViewById(R.id.et_name);
                et_address = (EditText) MainActivity.this.findViewById(R.id.et_address);
                rg_types = (RadioGroup) MainActivity.this.findViewById(R.id.rg_types);
                rb_take_out = (RadioButton) MainActivity.this.findViewById(R.id.rb_take_out);
                rb_sit_down = (RadioButton) MainActivity.this.findViewById(R.id.rb_sit_down);
                rb_delivery = (RadioButton) MainActivity.this.findViewById(R.id.rb_delivery);

                Address address = new Address();
                address.setName(et_name.getText().toString());
                address.setAddress(et_address.getText().toString());
                switch (rg_types.getCheckedRadioButtonId()) {
                    case R.id.rb_take_out:
                        address.setType(MainActivity.this.getString(R.string.take_out));
                        break;
                    case R.id.rb_sit_down:
                        address.setType(MainActivity.this.getString(R.string.sit_down));
                        break;
                    case R.id.rb_delivery:
                        address.setType(MainActivity.this.getString(R.string.delivery));
                        break;
                }

                Toast.makeText(MainActivity.this, address.toString(), Toast.LENGTH_SHORT)
                        .show();
                adapter.add(address);
            }
        });

        lv_address = (ListView) findViewById(R.id.lv_address);
        Log.d(TAG, "设置 Fancy List Item");
        this.adapter = new ArrayAdapter<Address>(MainActivity.this, R.layout.fancy_list_item, listAddress);
        lv_address.setAdapter(this.adapter);
    }

    class AddressAdapter extends ArrayAdapter<Address> {
        public AddressAdapter() {
            super(MainActivity.this, R.layout.fancy_list_item, listAddress);
            Log.d(TAG, "构造Fancy List Item");
        }

        @Override
        public int getCount() {
            return super.getCount();
        }

        @Override
        public long getItemId(int position) {
            return super.getItemId(position);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            //return super.getView(position, convertView, parent);
            View rowView = convertView;
            AddressHolder holder = null;
            if (rowView == null) {
                Log.d(TAG, "位置" + position + ";开始加载View");
                LayoutInflater layoutInflater = getLayoutInflater();
                rowView = layoutInflater.inflate(R.layout.fancy_list_item, parent, false);
                Log.d(TAG, "位置" + position + ";开始加载完成");
                holder = new AddressHolder(rowView);
                Log.d(TAG, "位置" + position + ";设置完成");
                rowView.setTag(holder);

            } else {
                holder = (AddressHolder) rowView.getTag();
            }

            holder.populateFrom(listAddress.get(position));

            return (rowView);
        }
    }

    static class AddressHolder {
        private TextView name = null;
        private TextView address = null;
        private ImageView icon = null;
        private View rowView = null;

        AddressHolder(View rowView) {
            this.rowView = rowView;

            name = (TextView) rowView.findViewById(R.id.et_name);
            address = (TextView) rowView.findViewById(R.id.et_address);
            icon = (ImageView) rowView.findViewById(R.id.iv_icon);
        }

        void populateFrom(Address r) {
            name.setText(r.getName());
            address.setText(r.getAddress());

            if (r.getType().equals("sit_down")) {
                icon.setImageResource(R.drawable.ball_red);
            } else if (r.getType().equals("take_out")) {
                icon.setImageResource(R.drawable.ball_yellow);
            } else {
                icon.setImageResource(R.drawable.ball_green);
            }
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

这个是我的Item XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent"
              android:layout_height="wrap_content"
              android:orientation="horizontal"
        >

    <ImageView
            android:id="@+id/iv_icon"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginRight="4px"
            >
    </ImageView>

    <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

        <TextView
                android:id="@+id/tv_name"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center_vertical"
                android:textStyle="bold"
                android:singleLine="true"
                android:ellipsize="end"
                ></TextView>

        <TextView
                android:id="@+id/tv_address"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:textStyle="bold"
                android:singleLine="true"
                android:ellipsize="end"
                ></TextView>
    </LinearLayout>
</LinearLayout>