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

<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>

import java.lang.reflect.Field;
import java.util.ArrayList;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.ListView;

public class MainActivity extends Activity implements
        SwipeRefreshLayout.OnRefreshListener {

    private SwipeRefreshLayout swipeLayout;
    private ListView listView;
    private ListViewAdapter adapter;
    private ArrayList<JavaBean> list;
    private int number = 0;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.activity_main);

        swipeLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_container);
        swipeLayout.setOnRefreshListener(this);
        swipeLayout.setColorScheme(android.R.color.holo_blue_bright,
                android.R.color.holo_green_light,
                android.R.color.holo_orange_light,
                android.R.color.holo_red_light);

        ViewTreeObserver vto = swipeLayout.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @SuppressLint("NewApi")
            public void onGlobalLayout() {
                final DisplayMetrics metrics = getResources()
                        .getDisplayMetrics();
                Float mDistanceToTriggerSync = Math.min(
                        ((View) swipeLayout.getParent()).getHeight() * 0.6f,
                        500 * metrics.density);
                try {
                    Field field = SwipeRefreshLayout.class
                            .getDeclaredField("mDistanceToTriggerSync");
                    field.setAccessible(true);
                    field.setFloat(swipeLayout, mDistanceToTriggerSync);
                } catch (Exception e) {
                    e.printStackTrace();
                }

                ViewTreeObserver obs = swipeLayout.getViewTreeObserver();
                obs.removeOnGlobalLayoutListener(this);
            }
        });

        list = new ArrayList<JavaBean>();
        list.add(new JavaBean(0, "Item0"));
        listView = (ListView) findViewById(R.id.list);
        adapter = new ListViewAdapter(this, list);
        listView.setAdapter(adapter);
    }

    public void onRefresh() {
        new Handler().postDelayed(new Runnable() {
            public void run() {
                swipeLayout.setRefreshing(false);
                list.add(new JavaBean(++number, "Item" + number));
                adapter.notifyDataSetChanged();
            }
        }, 1000);
    }
}