安卓自写Adapter

代码：

package com.example.ouradapter;

import android.app.ListActivity;

import android.content.Context;

import android.graphics.Color;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.RelativeLayout;

import android.widget.TableLayout.LayoutParams;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends ListActivity {

    private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"};

    private String[] mListStr = { "雨松MOMO", "男", "", "北京",

        "xuanyusong@gmail.com" };

    ImageView iamge = null;

    TextView title = null;

    TextView text = null;

    ListView mListView = null;

//    RelativeLayout rl=(RelativeLayout)this.findViewById(R.id.rl);

    MyListAdapter myAdapter = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

    mListView = getListView();

    myAdapter = new MyListAdapter(this);

    setListAdapter(myAdapter);

    mListView.setOnItemClickListener(new OnItemClickListener() {

        @Override

        public void onItemClick(AdapterView<?> adapterView, View view, int position,

            long id) {

        View v=adapterView.getChildAt(position);

        v.setBackgroundColor(Color.RED);

        Toast.makeText(MainActivity.this,"您选择了" + mListStr[position], Toast.LENGTH_LONG).show();

        }

    });  

//    View v=LayoutInflater.from(this).inflate(R.layout.activity_main, null);

//    iamge = (ImageView)v.findViewById(R.id.color_image);

//    title =(TextView)v.findViewById(R.id.color_title);

//    text= (TextView)v.findViewById(R.id.color_text);

//    title.setText(mListTitle[1]);

//    text.setText("123456789");

//    iamge.setImageResource(R.drawable.ic_launcher);

//    this.addContentView(v,new LinearLayout.LayoutParams(

//            LinearLayout.LayoutParams.WRAP_CONTENT,

//            LinearLayout.LayoutParams.WRAP_CONTENT));

    super.onCreate(savedInstanceState);

    }  

    public class MyListAdapter extends BaseAdapter {

        private Context mContext;

        private int[] colors = new int[] {Color.BLUE, Color.GREEN,Color.YELLOW,Color.WHITE };

        public MyListAdapter(Context context) {

            mContext = context;

        }  

        public int getCount() {

            return mListStr.length;

        }  

//        @Override

//        public boolean areAllItemsEnabled() {

//            return false;

//        }

        @Override

        public Object getItem(int position) {

            return position;

        }

        @Override

        public long getItemId(int position) {

            return position;

        }

       @Override

        public View getView(int position, View convertView, ViewGroup parent) {  

            if (convertView == null) {

            convertView = LayoutInflater.from(mContext).inflate(R.layout.activity_main, null);

            iamge = (ImageView) convertView.findViewById(R.id.color_image);

            title =(TextView) convertView.findViewById(R.id.color_title);

            text= (TextView) convertView.findViewById(R.id.color_text);

            }

            int colorPos = position % colors.length;

            convertView.setBackgroundColor(colors[colorPos]);

            title.setText(mListTitle[position]);

            text.setText(mListStr[position]);

             iamge.setImageResource(R.drawable.ic_launcher);

            return convertView;

       }

    }

}

listView在一开始绘制的时候首先会调用getCout()方法得到绘制次数，然后会实例化自己定义的BaseAdapter通过getView()方法一层一层绘制ListView,所以我们可以在这里面根据position(当前绘制的ID)来任意的修改绘制的内容。结果：

安卓自写Adapter

ArrayAdapter是BaseAdapter的子类，ArrayAdapter不仅具有BaseAdapter的所有方法还自定义了一些新的方法来处理列表项，所以单纯的从功能能上来讲ArrayAdapter远远强与BaseAdapter，如果是绘制一些数量比较少的列表建议使用BaseAdapter 如果绘制一些比较复杂的列表项并且列表项很多的建议使用ArrayAdapter。

秒客网

安卓自写Adapter

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