Use of Android listview

1. Define a simple adapter format.

First, define a layout as listviewitem. xml. which contains three textviews. The student ID, name, and class.

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/cuslistViewItem"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"         android:layout_marginLeft="10dp"        android:layout_marginBottom="10dp"/>    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"        android:layout_marginLeft="10dp"         android:layout_marginBottom="10dp"/>    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"        android:layout_marginLeft="10dp"        android:layout_marginBottom="10dp" /></LinearLayout>

Put a listview control in activity_main.xml, which is simple and not explained.

<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=".MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <ListView        android:id="@+id/listView1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/textView1"        android:layout_marginTop="50dp" >    </ListView></RelativeLayout>

 

Create a data source

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ListView lv = (ListView)this.findViewById(R.id.listView1);ArrayList<HashMap<String,String>> listSource = new ArrayList<HashMap<String,String>>();for(int num=1; num< 10; num++){HashMap<String,String> map = new HashMap<String, String>();map.put("num",String.valueOf(num));map.put("name", "stu"+num );map.put("className", "software 2");listSource.add(map);}SimpleAdapter mStuInfo = new SimpleAdapter(this,listSource,R.layout.listviewitem, new String[] {"num","name","className"}, new int[]{R.id.textView1, R.id.textView2, R.id.textView3});lv.setAdapter(mStuInfo);}}

Finally, bind the listview to the data source of the adapter. For example.

Of course, you can add the itemclick event.

 lv.setOnItemClickListener(new ItemClickListener());

Then implement itemclicklistener.

 class ItemClickListener implements OnItemClickListener { //arg2 is the position //arg3 is row number@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {// TODO Auto-generated method stubHashMap<String, String> item=(HashMap<String, String>) arg0.getItemAtPosition(arg2); Toast.makeText(MainActivity.this, item.get("name"), Toast.LENGTH_LONG).show();}}

The usage of listview and gridview is the same here. You can replace the listview control with the gridview control.

 

II. The following uses a new adapter form. The student picture will be added and the layout will be reorganized. The effect is as follows:

The Code is as follows:

The redesigned listviewitem. xml.

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/cuslistViewItem"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >    <ImageView        android:id="@+id/imageView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10dp"        android:layout_marginBottom="10dp" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"         android:layout_toRightOf="@+id/imageView1"        android:layout_marginLeft="10dp"        android:layout_marginBottom="10dp"/>    <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"        android:layout_toRightOf="@+id/textView1"         android:layout_marginLeft="10dp"         android:layout_marginBottom="10dp"/>    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView"        android:layout_toRightOf="@+id/imageView1"        android:layout_below="@+id/textView1"        android:layout_marginLeft="10dp"        android:layout_marginBottom="30dp" /></RelativeLayout>

 

Data Source again. The mylistviewadapter class is created to inherit the baseadapter.

Public class mainactivity extends activity {@ overrideprotected void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. activity_main); listview Lv = (listview) This. findviewbyid (R. id. listview1); arraylist