android 28 SimpleAdapter

监听器返回fasle，则事件还会分发给其他监听器。

SimpleAdapter是BaseAdapter的子类，对适配器进行了简化，数据的格式是List，List的元素必须是Map, public SimpleAdapter(Context context, List<? extends Map<String, ?>> data,

            int resource, String[] from, int[] to) {//Activity是Context的子类，resource是每一行ListViewItem布局，from是Map中头像和名字的所有的键，所有头像的健和所有名字的健，to是ListViewItem（每一行）布局的id值，

开发不灵活。

MainActivity.java

package com.sxt.day05_02;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

    ListView mlvGenerals;//<ListView/>

    List<Map<String, Object>> mGenerals;

    SimpleAdapter mAdapter;

    static final String KEY_PHOTOID="photoid";

    static final String KEY_NAME="name";

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initData();//初始化数据

        initView();

    }

    private void initView() {

        mlvGenerals=(ListView) findViewById(R.id.lvGeneral);

        mAdapter=new SimpleAdapter(this, mGenerals,

            R.layout.item_generals,

            new String[]{KEY_PHOTOID,KEY_NAME},

            new int[]{R.id.ivThumb,R.id.tvName});

        mlvGenerals.setAdapter(mAdapter);

    }

    private void initData() {

        int[] resid={

                R.drawable.baiqi,R.drawable.caocao,R.drawable.chengjisihan,

                R.drawable.hanxin,R.drawable.lishimin,R.drawable.nuerhachi,

                R.drawable.sunbin,R.drawable.sunwu,R.drawable.yuefei,

                R.drawable.zhuyuanzhang

        };

        String[] names=getResources().getStringArray(R.array.generals);//R.array.generals是string.xml中定义的数组，

        mGenerals=new ArrayList<Map<String,Object>>();

        HashMap<String, Object> general;

        for (int i = 0; i < names.length; i++) {//List是一个集合，

            general=new HashMap<String, Object>();//集合里面是Map

            general.put(KEY_PHOTOID, resid[i]);//每一个Map里面放了2个键值对

            general.put(KEY_NAME, names[i]);

            mGenerals.add(general);

        }

    }

}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <ListView

        android:id="@+id/lvGeneral"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:divider="#ccc"

        android:dividerHeight="2dp"/>

</RelativeLayout>

item_generals.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:orientation="horizontal" >

    <ImageView

        android:id="@+id/ivThumb"

        android:layout_width="80dp"

        android:layout_height="80dp"

        android:scaleType="fitXY"

        android:src="@drawable/baiqi"/>

    <TextView

        android:id="@+id/tvName"

        android:layout_width="wrap_content"

        android:layout_height="80dp"

        android:layout_marginLeft="10dp"

        android:text="白起"

        android:textSize="20sp"

        android:gravity="center_vertical"/>

</LinearLayout>