Android官方的下拉刷新SwipeRefreshLayout更新圆圈不动的小改进和解决

分手后的思念是犯贱 2023-10-16 22:20 17阅读 0赞

**Android官方的下拉刷新SwipeRefreshLayout更新圆圈不动的小改进和解决**

之前我写了一篇文章介绍了Android官方的下拉刷新组件SwipeRefreshLayout，《Android SwipeRefreshLayout：谷歌官方SDK包中的下拉刷新（文章链接地址：[http://blog.csdn.net/zhangphil/article/details/46965377][http_blog.csdn.net_zhangphil_article_details_46965377] ）》，发现存在一些问题，问题在下拉刷新时候，上方转动的更新指示圆圈会暂停转动，当时写文章时候因为添加数据很快就返回，最近在处理长时间数据操作时候这个问题暴露出来了，对此进行改进，其实就是用AsyncTask做后台数据的好事操作，然后更新。

完善后的代码：

测试代码：

package zhangphil.materialdesign;
    
    import java.util.ArrayList;
    
    import android.support.v4.widget.SwipeRefreshLayout;
    import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
    import android.app.Activity;
    import android.os.AsyncTask;
    import android.os.Bundle;
    import android.os.SystemClock;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    
    public class MainActivity extends Activity {
    
    	private SwipeRefreshLayout swipeRefreshLayout;
    
    	private int count = 0;
    	private ArrayList<String> data = new ArrayList<String>();
    	private ArrayAdapter<String> adapter;
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    
    		swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
    		swipeRefreshLayout.setSize(SwipeRefreshLayout.LARGE);
    
    		// 设置下拉多少距离之后开始刷新数据
    		swipeRefreshLayout.setDistanceToTriggerSync(100);
    
    		// 设置进度条背景颜色
    		swipeRefreshLayout.setProgressBackgroundColorSchemeColor(this.getResources().getColor(android.R.color.holo_blue_light));
    
    		// 设置刷新动画的颜色，可以设置1或者更多.
    		swipeRefreshLayout.setColorSchemeColors(getResources().getColor(android.R.color.holo_blue_bright),
    				getResources().getColor(android.R.color.holo_orange_light),
    				getResources().getColor(android.R.color.holo_green_light));
    
    		swipeRefreshLayout.setOnRefreshListener(new OnRefreshListener() {
    
    			@Override
    			public void onRefresh() {
    				/**
    				 * 注意：AsyncTask是单线程顺序执行的线程任务。
    				 * 如果涉及到大量、耗时的线程加载任务，可以考虑自己利用Thread(ExecutorService线程池)+Handler+Message实现。
    				 * */
    				LongTimeOperationTask task = new LongTimeOperationTask();
    				task.execute();
    			}
    		});
    
    		adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);
    		ListView listView = (ListView) findViewById(android.R.id.list);
    		listView.setAdapter(adapter);
    	}
    
    	private class LongTimeOperationTask extends AsyncTask<String, Integer, String> {
    
    		@Override
    		protected void onPreExecute() {
    			swipeRefreshLayout.setRefreshing(true);
    		}
    
    		@Override
    		protected String doInBackground(String... params) {
    			SystemClock.sleep(3000);
    			data.add(0, "数据" + (count++));
    			return null;
    		}
    
    		@Override
    		protected void onPostExecute(String result) {
    			adapter.notifyDataSetChanged();
    			swipeRefreshLayout.setRefreshing(false);
    		}
    	}
    }

布局文件：

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

效果：

![Center][]

[http_blog.csdn.net_zhangphil_article_details_46965377]: http://blog.csdn.net/zhangphil/article/details/46965377
[Center]: https://img-blog.csdn.net/20151004141641248?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center