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);
}
}