android自带的下拉刷新

最新推荐文章于 2021-05-27 05:40:49 发布

转载最新推荐文章于 2021-05-27 05:40:49 发布 · 286 阅读

本文介绍如何在Android应用中实现带有动画效果的下拉刷新功能。通过设置SwipeRefreshLayout监听器并使用Handler延迟执行任务来更新界面显示随机数字，同时调整下拉刷新的触发距离。

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public class MainActivity extends Activity implements OnRefreshListener{

	
	private SwipeRefreshLayout mSwipeRefreshLayout;
	private TextView mRandomText;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mSwipeRefreshLayout = (SwipeRefreshLayout)this.findViewById(R.id.swipe_refresh);
		mSwipeRefreshLayout.setOnRefreshListener(this);
		mRandomText = (TextView)this.findViewById(R.id.random_text);
		
	}


	@Override
	public void onRefresh() {
		mSwipeRefreshLayout.setRefreshing(true);
		
		(new Handler()).postDelayed(new Runnable() {
			
			@Override
			public void run() {
				//3秒后停止刷新
				mSwipeRefreshLayout.setRefreshing(false);
				int num = (int)(Math.random() * 100 + 1);
				String s = mRandomText.getText().toString();
				s = s +   + num;
				mRandomText.setText(s);
				
			}
		}, 3000);
	}
}

如果想要加下拉刷新的动画

swipeRefreshLayout.setColorSchemeColors(R.color.colorAccent, R.color.colorPrimary);
ViewTreeObserver vio = swipeRefreshLayout.getViewTreeObserver();
vio.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        final DisplayMetrics metrics = getResources()
                .getDisplayMetrics();
        Float mDistanceToTriggerSync = Math.min(
                ((View) swipeRefreshLayout.getParent()).getHeight() * 0.6f,
                500 * metrics.density);
        try {
            Field field = SwipeRefreshLayout.class
                    .getDeclaredField("mDistanceToTriggerSync");
            field.setAccessible(true);
            field.setFloat(swipeRefreshLayout, mDistanceToTriggerSync);
        } catch (Exception e) {
            e.printStackTrace();
        }
    ViewTreeObserver obs = swipeRefreshLayout.getViewTreeObserver();
    obs.removeOnGlobalLayoutListener(this);
}
});