ListView示例

用listview写一个列表,自定义item样式

遇到的问题,一定要给item的文本设置字体颜色,第一次没设,一直以为程序有bug,结果字体是白色的,好好的被折腾了一番;另外图片的导入也需要注意,有几次不能展示,很奇怪,问题没法复现,多次重新编译后成功,不知道为什么

样式文件

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">

<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:divider="#4287f5"
android:dividerHeight="1dp" />
</LinearLayout>

Item

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">

<ImageView
android:id="@+id/item_iv"
android:layout_width="102dp"
android:layout_height="75dp"
app:srcCompat="@drawable/dog" />

<TextView
android:id="@+id/item_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="text"
android:textColor="@color/colorAccent" />
</LinearLayout>

Activity

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package com.example.listview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private ListView listView;
private String[] datas={ "第1条数据", "第2条数据", "第3条数据", "第4条数据"};
private int[] icons={ R.drawable.dog,R.drawable.dog,R.drawable.dog,R.drawable.dog, };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

listView=(ListView)findViewById(R.id.lv);
MyBaseadapter mAdapter=new MyBaseadapter();
listView.setAdapter(mAdapter);
}

static class ViewHolder{
ImageView iv;
TextView tv;
}

class MyBaseadapter extends BaseAdapter{
@Override
public int getCount(){
return datas.length;
}
@Override
public Object getItem(int position){
return datas[position];
}
@Override
public long getItemId(int position){
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
ViewHolder holder;
if (convertView==null){
convertView= LayoutInflater.from(getApplicationContext()).inflate(R.layout.list_item,parent,false);
// LayoutInflater.from()从一个Context中获取一个布局填充器
//inflate()将xml转化为view
holder=new ViewHolder();
holder.iv=(ImageView)convertView.findViewById(R.id.item_iv);
holder.tv=(TextView) convertView.findViewById(R.id.item_tv);
convertView.setTag(holder);
}else {
holder=(ViewHolder) convertView.getTag();
}
holder.tv.setText(datas[position]);
Log.e("tv",datas[position]);
holder.iv.setImageResource(icons[position]);
return convertView;
}
}
}

界面