Android ListView自动生成列表条目的实例

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ListView  android:id="@+id/listview"  android:layout_width="match_parent"  android:layout_height="match_parent"> </ListView></LinearLayout>

package com.example.sample_6_4;import android.app.Dialog;import android.graphics.Color;import android.preference.DialogPreference;import android.support.v7.app.AlertDialog;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.TextView;public class ListActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_list);  ListView lv = (ListView)findViewById(R.id.listview);  //做一个适配器来使用ListView  lv.setAdapter(new MyAdapter()); } class MyAdapter extends BaseAdapter{  @Override  //返回条目的个数，列表的条目，例如一个屏幕显示多少条  public int getCount(){   return 20;  }  @Override  //确定每个条目的布局和内容，position代表条目的位置，从0开始  public View getView(int position, View converView, ViewGroup parent){   TextView tv = new TextView(ListActivity.this);   tv.setText("条目" + position);   tv.setTextSize(23);   tv.setTextColor(Color.BLUE);   return tv;  }  @Override  public Object getItem(int position){   return null;  }  @Override  public long getItemId(int position){   return 0;  } }}