Android SimpleAdapter应用介绍,代码+解释 ListView使用+滚动监听用scoll
2016-07-01 16:26
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MainActivity的文件代码:
activity_main的代码:
最后建立,listview的子项目布局:
命名为tem:
package com.example.myapplication; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AbsListView; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Objects; public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, AbsListView.OnScrollListener { private ListView listView; private SimpleAdapter simpleAdapter; private List<Map<String,Object>> dataList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); dataList = new ArrayList<Map<String, Object>>(); listView = (ListView) findViewById(R.id.listView); simpleAdapter = new SimpleAdapter(this,getData(),R.layout.tem,new String[]{"pic","text"},new int[]{R.id.pic,R.id.text}); listView.setAdapter(simpleAdapter); listView.setOnItemClickListener(this); listView.setOnScrollListener(this); } private List<Map<String,Object>> getData() { for(int i = 0;i<20;i++) { Map<String,Object> map = new HashMap<String,Object>(); map.put("pic",R.mipmap.ic_launcher); map.put("text","慕课网"+i); dataList.add(map); } return dataList; } @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { String text = listView.getItemAtPosition(i)+""; Toast.makeText(this,"position = " + i +"text" + text,Toast.LENGTH_SHORT).show(); } @Override public void onScrollStateChanged(AbsListView absListView, int i) { switch (i) { case SCROLL_STATE_FLING: Log.i("Main", "用户在手指离开屏幕之前,由于用力滑了一下,师徒扔依靠惯性继续滑动: "); Map<String,Object> map = new HashMap<String,Object>(); map.put("pic",R.mipmap.ic_launcher); map.put("text","增加项"); dataList.add(map); simpleAdapter.notifyDataSetChanged(); break; case SCROLL_STATE_IDLE: Log.i("Main", "视图已经停止滑动"); break; case SCROLL_STATE_TOUCH_SCROLL: Log.i("Main", "手指没有离开屏幕,视图正在滑动"); break; } } @Override public void onScroll(AbsListView absListView, int i, int i1, int i2) { } }
activity_main的代码:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.myapplication.MainActivity"> <ListView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/listView" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" /> </RelativeLayout>
最后建立,listview的子项目布局:
命名为tem:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:orientation="horizontal" android:layout_height="match_parent"> <ImageView android:id="@+id/pic" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher"/> <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="慕课网"/> </LinearLayout>
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