Android list usage (ListView GridView Gallery picture timing scrolling)

ListView

Function: 1. Fill data to the layout. 2. Handle the user's selection, click and other operations.

According to the adapter type of the list, the list is divided into three types, ArrayAdapter, SimpleAdapter and SimpleCursorAdapter

Example:

 

 

listview.xml
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:descendantFocusability="afterDescendants">
    <!-- android:cacheColorHint="#00000000" background transparent -->
     <!-- android:dividerHeight="1dp" item limit width-->
      <!-- android:cacheColorHint="#00000000" item boundary color-->
    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:cacheColorHint="#00000000"
        android:dividerHeight="1dp"
        android:divider="#FF0000"
     />
</LinearLayout>
item.xml
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="horizontal">
    <!-- List item layout -->
    <ImageView
        android:id="@+id/img"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_marginLeft="15dp"
        android:src="@drawable/a2"/>
    <TextView
        android:id="@+id/txtname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="25dp"/>
</LinearLayout>

 

 

 

 

ActivityListView.Java

 

 

public class ActivityListView extends Activity {
   private ListView mListView;
   protected void onCreate(android.os.Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        //Load the layout file where the listview control is located
        setContentView(R.layout.listview_layout);
        //Get the object of the listview control
        mListView = (ListView)findViewById(R.id.listview);
        /**
         *Define SimpleAdapter (and load the corresponding item layout file, get the corresponding keY, get the id of the component in the corresponding item layout file
         *The second parameter data: data source The third parameter resource: the layout file corresponding to each item of the listView The fourth parameter from:
         *The fifth parameter to: new String[]{corresponding key}v
         */
        SimpleAdapter simpleAdapter =new SimpleAdapter(this, get_data(),
              R.layout.item_listview,new String[]{"name","img" },
              newint[] { R.id.txtname, R.id.img });
             //Bind the adapter to the listView control via setAdapter
              mListView.setAdapter(simpleAdapter);
      };
        /**
          *data source
          */
        String[] name = { "Zhang San", "Li Si", "Little Star", "Quiet", "Mingming", "Xiao Cui" };
         private ArrayList<Map<String, Object>> get_data() {
         //Define a collection of ArrayList (the collection encapsulates a collection of map type)
               ArrayList<Map<String, Object>> data_list =new ArrayList<Map<String,Object>>();
               for (int i = 0; i<name.length; i++) {
                 // key,valueintstring map不能new map
                 Map<String, Object> data_map =new HashMap<String, Object>();
                 data_map.put("name",name[i]);
                 data_map.put("img",R.drawable.a1);
                  //Add (encapsulate) the map collection to the ArrayList collection
                 data_list.add(data_map);
         }
             //return ArrayList collection
             return data_list;
        }
}

 

Gallery

Function: Realize the timing and scrolling display of pictures

 

Example:

gallery.xml
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical"
    android:orientation="vertical">
    <Gallery
        android:id="@+id/gallery"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:spacing="0dip"/>
</LinearLayout>

 

public class ActivityGrelly extends Activity {
   /** Called when the activity isfirst created. */
   private int index;
   private Gallery g;
   private Handler handler;
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate (savedInstanceState);
      setContentView(R.layout.gallery_layout);
      initView();
   }
 
   private void initView() {
      // TODOAuto-generated method stub
      // Get the Gallery object
      g = (Gallery)findViewById(R.id.gallery);
 
      // Add ImageAdapter to Gallery object
      g.setAdapter(newImageAdapter(this));
 
      // Set the background of the Gallery
      g.setBackgroundResource(R.drawable.bg);
 
      TimerTask task = new TimerTask() {
 
         @Override
         public void run() {
            Message message = new Message();
            message.what = 2;
            index = g.getSelectedItemPosition();
            index++;
            handler.sendMessage(message);
         }
      };
      Timer timer = new Timer ();
      timer.schedule(task, 3000, 3000);
      handler = new Handler () {
 
         @Override
         public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
            case 2:
                g.setSelection(index);
                break;
 
            default:
                break;
            }
         }
 
      };
 
      // Set the event listener for Gallery
      g.setOnItemClickListener(new OnItemClickListener() {
         public void onItemClick(AdapterView<?> parent, View v,
                int position,long id) {
            Toast.makeText(ActivityGrelly.this,
                   "You selected" + (position + 1) + "Image", Toast.LENGTH_SHORT)
                   .show();
         }
      });
   }
}

 

 

 

 

Effect:

 

 

Source code download:

 

Eclipse download: http://download.csdn.net/detail/dickyqie/9620303

AndroidStudio download: https://github.com/DickyQie/android-list-control/tree/list-use