GridView是类似于ListView的控件，只是GridView可以使用多个列来呈现内容，而ListView是以行为单位，所以用法上是差不多的。
主布局文件，因为要做下拉刷新，所以加了一个ProgressBar，GridView的numColumns属性是指每一行有多少列
<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" tools:context="com.example.girdlayoutdemo.MainActivity" > <ProgressBar android:id="@+id/pb" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" /> <GridView android:layout_below="@id/pb" android:id="@+id/gv" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="5dp" android:gravity="center" android:numColumns="2" > </GridView> </RelativeLayout>
每个Item的布局文件，这里比较简单的一张图片加一段文字
<"1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ImageView android:id="@+id/item_iv" android:layout_width="fill_parent" android:layout_height="0dp" android:layout_weight="3" /> <TextView android:id="@+id/item_tv" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" /> </LinearLayout>
主活动代码：
public class MainActivity extends Activity { private GridView gv; private ProgressBar pb; private List<Map<String, Object>> list; private SimpleAdapter adapter; private GestureDetector gsDetector; private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case 1: pb.setVisibility(View.GONE); Toast.makeText(MainActivity.this, "刷新成功", 200).show(); break; default: break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pb = (ProgressBar) findViewById(R.id.pb); gv = (GridView) findViewById(R.id.gv); pb.setVisibility(View.GONE); initData(); adapter = new SimpleAdapter(this, list, R.layout.item_layout, new String[] { "image", "text" }, new int[] { R.id.item_iv, R.id.item_tv }); gv.setAdapter(adapter); gsDetector = new GestureDetector(this, new Mlistener()); gv.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // Log.e("MainActivity", event.getX()+""); return gsDetector.onTouchEvent(event); } }); } private void initData() { list = new ArrayList<Map<String, Object>>(); for (int i = 0; i < 20; i++) { Map<String, Object> map = new HashMap<String, Object>(); map.put("image", R.drawable.gift_item_default); map.put("text", "一只冰莹猪猪"); list.add(map); } } class Mlistener implements OnGestureListener { @Override public boolean onDown(MotionEvent e) { return false; } @Override public void onShowPress(MotionEvent e) { } @Override public boolean onSingleTapUp(MotionEvent e) { return false; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return false; } @Override public void onLongPress(MotionEvent e) { } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (e2.getY() - e1.getY() > 0 && gv.getFirstVisiblePosition() == 0) { pb.setVisibility(View.VISIBLE); Animation animation = new ScaleAnimation(1f, 1f, 0, 1f); animation.setDuration(300); pb.startAnimation(animation); new Thread(new Runnable() { @Override public void run() { try { Thread.sleep(2000); Message msg = new Message(); msg.what = 1; handler.sendMessage(msg); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } return false; } } }
解析：
在onCreate方法中先获取两个组件，然后把progressBar设置为隐藏，下拉的时候再显示，刷新完毕再隐藏。然后为GridView设置数据源，这里方便起见用SimpleAdapter，然后给GridView设置ontouchListener，并在onTouch方法中把触摸事件交给我们自定义的GestureDetector对象来处理，在GestureDetector的onFling方法中处理下拉事件，在里面判断是否下拉以及GridView是否在最顶端，如果是，显示progressBar控件并开一个线程来处理刷新，这里做模拟就睡眠2000毫秒，最后用message对象返回一个消息给Handler，Handler在主线程中更新GridView。
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); pb = (ProgressBar) findViewById(R.id.pb); gv = (GridView) findViewById(R.id.gv); pb.setVisibility(View.GONE); initData(); adapter = new SimpleAdapter(this, list, R.layout.item_layout, new String[] { "image", "text" }, new int[] { R.id.item_iv, R.id.item_tv }); gv.setAdapter(adapter); gsDetector = new GestureDetector(this, new Mlistener()); gv.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // Log.e("MainActivity", event.getX()+""); return gsDetector.onTouchEvent(event); } }); }
class Mlistener implements OnGestureListener { @Override public boolean onDown(MotionEvent e) { return false; } @Override public void onShowPress(MotionEvent e) { } @Override public boolean onSingleTapUp(MotionEvent e) { return false; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return false; } @Override public void onLongPress(MotionEvent e) { } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (e2.getY() - e1.getY() > 0 && gv.getFirstVisiblePosition() == 0) { pb.setVisibility(View.VISIBLE); Animation animation = new ScaleAnimation(1f, 1f, 0, 1f); animation.setDuration(300); pb.startAnimation(animation); new Thread(new Runnable() { @Override public void run() { try { Thread.sleep(2000); Message msg = new Message(); msg.what = 1; handler.sendMessage(msg); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }).start(); } return false; } }
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