采用inflate把xml文件转化成view对象

package visizen.com.sqlite;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    ListView listView;
    List<User> users;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        UserDao2 dao = new UserDao2(this);
        users = dao.findAll();

        this.listView = (ListView) this.findViewById(R.id.listView);

        this.listView.setAdapter(new MyAdapter());


    }

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

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private class MyAdapter extends BaseAdapter {

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

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = View.inflate(MainActivity.this, R.layout.list_item, null);
            TextView tv_id = (TextView) view.findViewById(R.id.tv_id);
            TextView tv_name = (TextView) view.findViewById(R.id.tv_name);
            TextView tv_money = (TextView) view.findViewById(R.id.tv_money);
            User user = users.get(position);
            tv_id.setText(user.getId() + "");
            tv_name.setText(user.getName());
            tv_money.setText(user.getName() + "");
            return view;
        }
    }
}