深入浅出学习Android ListView基础

易采站长站为您分析深入浅出的带领大家学习Android ListView基础，ListView是安卓里常用的控件，本文介绍一下常用用法，以及优化等方法，感兴趣的小伙伴们可以参考一下  

ListView 简介

ListView 是安卓里常用的控件， 本文介绍一下常用用法，以及优化等方法

1、改写activity_main.xml

<LinearLayout xmlns:android="http://www.easck.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <ListView
    android:id="@+id/listview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</LinearLayout>

2、新建一个javabean

package com.example.tomchen.testlistview;
public class Icon {
  private int imageId;
  private String name;

  public Icon(String name, int imageId) {
    this.name = name;
    this.imageId = imageId;
  }

  public String getName() {
    return name;
  }

  public int getImageId() {
    return imageId;
  }
}

3、新建icon_item.xml 用于 listview 每个元素的视图

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://www.easck.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="horizontal">

  <TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="match_parent" />

  <ImageView
    android:id="@+id/icon"
    android:layout_width="wrap_content"
    android:layout_height="match_parent" />

</LinearLayout>

4、新建一个class IconAdapter 继承自 ArrayAdapter

package com.example.tomchen.testlistview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class IconAdapter extends ArrayAdapter<Icon> {
  private int resourceId;


  public IconAdapter(Context context, int resource, List<Icon> icons) {
    super(context, resource, icons);
    this.resourceId = resource;
  }


  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    Icon icon = getItem(position);
    View view;
    if (convertView == null) {
      view = LayoutInflater.from(getContext()).inflate(resourceId, null);
    } else {
      view = convertView;
    }
    ImageView image = (ImageView) view.findViewById(R.id.icon);
    image.setImageResource(icon.getImageId());
    TextView text = (TextView) view.findViewById(R.id.text);
    text.setText(icon.getName());
    return view;
  }
}

								 
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