Android ch5 10 ListView清單元件1

[Android]_ch5.10_ListView清單元件

package com.derek.ch17_listview;



import android.R.integer;

import android.R.layout;

import android.app.Activity;

import android.content.Context;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

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.TextView;

import android.widget.Toast;





public class MainActivity extends Activity {

ListView LV;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        LV=(ListView)findViewById(R.id.listView1);

        LV.setAdapter(new MyAdapter(MainActivity.this));

        LV.setOnItemClickListener(new OnItemClickListener() {

        @Override

public void onItemClick(AdapterView<?> parent, View view,int position, long id) {

        TextView tv=((TextView)((LinearLayout)view).getChildAt(1));       

Toast.makeText(MainActivity.this, tv.getText().toString(), Toast.LENGTH_SHORT).show();

}

});

    }

    class MyAdapter extends BaseAdapter{

    int images[]={R.drawable.a1,R.drawable.a2,R.drawable.a3,R.drawable.a4,R.drawable.a5,

    R.drawable.a6,R.drawable.a7,R.drawable.a8,R.drawable.a9,R.drawable.a10,

    R.drawable.a11,R.drawable.a12,R.drawable.a13,R.drawable.a14,R.drawable.a15};

    LayoutInflater layoutInflater;

    public MyAdapter(Context context) {

layoutInflater=(LayoutInflater)context.getSystemService(LAYOUT_INFLATER_SERVICE);

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return images.length;

}



@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return null;

}



@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return 0;

}



@Override

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

ViewHolder viewHolder;

if(convertView==null){

convertView=layoutInflater.inflate(R.layout.listitems, null);

viewHolder=new ViewHolder();

viewHolder.iv=(ImageView)convertView.findViewById(R.id.imageView1);

viewHolder.tv=(TextView)convertView.findViewById(R.id.textView1);

convertView.setTag(viewHolder);

}else{

viewHolder=(ViewHolder)convertView.getTag();

}

viewHolder.iv.setImageResource(images[position]);

viewHolder.tv.setText("No."+(position+1));

return convertView;

}

class ViewHolder{

ImageView iv;

TextView tv;

}   

    }

}