2Android自己的下拉刷新SwipeRefreshLayout--样式2

Posted 2020-06-17

<android.support.v4.widget.SwipeRefreshLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swipe_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>

 3 import java.lang.reflect.Field;
 4 import java.util.ArrayList;
 5 import android.annotation.SuppressLint;
 6 import android.app.Activity;
 7 import android.os.Bundle;
 8 import android.os.Handler;
 9 import android.support.v4.widget.SwipeRefreshLayout;
10 import android.util.DisplayMetrics;
11 import android.view.View;
12 import android.view.ViewTreeObserver;
13 import android.widget.ListView;
14 
15 public class MainActivity extends Activity implements
16         SwipeRefreshLayout.OnRefreshListener {
17 
18     private SwipeRefreshLayout swipeLayout;
19     private ListView listView;
20     private ListViewAdapter adapter;
21     private ArrayList<JavaBean> list;
22     private int number = 0;
23 
24     protected void onCreate(Bundle savedInstanceState) {
25         super.onCreate(savedInstanceState);
26         
27         setContentView(R.layout.activity_main);
28 
29         swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
30         swipeLayout.setOnRefreshListener(this);
31         swipeLayout.setColorScheme(android.R.color.holo_blue_bright,
32                 android.R.color.holo_green_light,
33                 android.R.color.holo_orange_light,
34                 android.R.color.holo_red_light);
35 
36         ViewTreeObserver vto = swipeLayout.getViewTreeObserver();
37         vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
38             @SuppressLint("NewApi")
39             public void onGlobalLayout() {
40                 final DisplayMetrics metrics = getResources()
41                         .getDisplayMetrics();
42                 Float mDistanceToTriggerSync = Math.min(
43                         ((View) swipeLayout.getParent()).getHeight() * 0.6f,
44                         500 * metrics.density);
45                 try {
46                     Field field = SwipeRefreshLayout.class
47                             .getDeclaredField("mDistanceToTriggerSync");
48                     field.setAccessible(true);
49                     field.setFloat(swipeLayout, mDistanceToTriggerSync);
50                 } catch (Exception e) {
51                     e.printStackTrace();
52                 }
53 
54                 ViewTreeObserver obs = swipeLayout.getViewTreeObserver();
55                 obs.removeOnGlobalLayoutListener(this);
56             }
57         });
58 
59         list = new ArrayList<JavaBean>();
60         list.add(new JavaBean(0, "Item0"));
61         listView = (ListView) findViewById(R.id.list);
62         adapter = new ListViewAdapter(this, list);
63         listView.setAdapter(adapter);
64     }
65 
66     public void onRefresh() {
67         new Handler().postDelayed(new Runnable() {
68             public void run() {
69                 swipeLayout.setRefreshing(false);
70                 list.add(new JavaBean(++number, "Item" + number));
71                 adapter.notifyDataSetChanged();
72             }
73         }, 1000);
74     }
75 }