如何在android中的webview上获取onclick事件? [英] How can I get onclick event on webview in android?

问题描述

我想知道用户何时点击了 webview 而不是超链接.在那次单击时，我想显示/隐藏包含 web 视图的活动视图.有什么建议吗?

I want to know when the user clicks on webview but not on a hyperlink. On that click I want to show/hide a view of my activity that holds a webview. Any suggestion?

推荐答案

我看了看这个，发现 WebView 似乎没有将点击事件发送到 OnClickListener.如果有人能证明我错了或告诉我原因，那么我很想听听.

I took a look at this and I found that a WebView doesn't seem to send click events to an OnClickListener. If anyone out there can prove me wrong or tell me why then I'd be interested to hear it.

我确实发现WebView 会将触摸事件发送到OnTouchListener.它确实有自己的 onTouchEvent 方法，但我似乎只使用该方法获得了 MotionEvent.ACTION_MOVE.

What I did find is that a WebView will send touch events to an OnTouchListener. It does have its own onTouchEvent method but I only ever seemed to get MotionEvent.ACTION_MOVE using that method.

因此，鉴于我们可以在已注册的触摸事件侦听器上获取事件，剩下的唯一问题是如何在用户单击 URL 时规避您希望为触摸执行的任何操作.

So given that we can get events on a registered touch event listener, the only problem that remains is how to circumvent whatever action you want to perform for a touch when the user clicks a URL.

这可以通过一些花哨的 Handler 步法来实现，方法是发送触摸的延迟消息，然后如果触摸是由用户单击 URL 引起的，则删除这些触摸消息.

This can be achieved with some fancy Handler footwork by sending a delayed message for the touch and then removing those touch messages if the touch was caused by the user clicking a URL.

这是一个例子:

public class WebViewClicker extends Activity implements OnTouchListener, Handler.Callback {

private static final int CLICK_ON_WEBVIEW = 1;
private static final int CLICK_ON_URL = 2;

private final Handler handler = new Handler(this);

private WebView webView;
private WebViewClient client;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.web_view_clicker);
    
    webView = (WebView)findViewById(R.id.web);
    webView.setOnTouchListener(this);

    client = new WebViewClient(){ 
        @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { 
            handler.sendEmptyMessage(CLICK_ON_URL);
            return false;
        } 
    }; 
    
    webView.setWebViewClient(client);
    webView.setVerticalScrollBarEnabled(false);
    webView.loadUrl("http://www.example.com");
}

@Override
public boolean onTouch(View v, MotionEvent event) {
    if (v.getId() == R.id.web && event.getAction() == MotionEvent.ACTION_DOWN){
        handler.sendEmptyMessageDelayed(CLICK_ON_WEBVIEW, 500);
    }
    return false;
}

@Override
public boolean handleMessage(Message msg) {
    if (msg.what == CLICK_ON_URL){
        handler.removeMessages(CLICK_ON_WEBVIEW);
        return true;
    }
    if (msg.what == CLICK_ON_WEBVIEW){
        Toast.makeText(this, "WebView clicked", Toast.LENGTH_SHORT).show();
        return true;
    }
    return false;
}
}

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