Android笔记（二十一） Android中的Adapter

         Android中有一些View是包含多个元素的，例如ListView，GridView等，为了给View的每一个元素都设置数据，就需要Adapter了。

         常用的Adapter包括ArrayAdapter和SimpleAdapter。

         ArrayAdapter比较简单，它只能用于显示文字。看代码：

MainActivity.java

package cn.lixyz.listviewtest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{

    private ListView listView;

    private String[] data = {"橘子","苹果","香蕉","西瓜","樱桃","猕猴桃","木瓜","山竹",
            "桃","葡萄","山楂","杏","核桃","哈密瓜","菠萝","柚子","无花果","柠檬","李子"};

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

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, data);

        listView = (ListView) findViewById(R.id.list_view);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String text = listView.getItemAtPosition(position) + "";
        Toast.makeText(this,"position=" + position + " text=" + text,Toast.LENGTH_SHORT).show();

        Intent intent = new Intent(MainActivity.this,ShowFruit.class);
        intent.putExtra("fruitNum",position);
        startActivity(intent);
    }
}

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