有没有一种方法可以覆盖WebView的行为? [英] Is there a way to override the behavior of WebView?

问题描述

我从布局中获得了WebView:

        WebView webView = (WebView) rootView.findViewById(R.id.myWebView);

我想覆盖onKeyDown的行为. 通常，我可以通过子类覆盖它.

I want to override the behavior of onKeyDown. Normally, I can override it by subclassing.

        WebView webView = new WebView(this) {

        @Override
        public boolean onKeyDown (int keyCode, KeyEvent event) {
        // Do my stuff....
        }
}

但是，由于我是使用findViewById来获取WebView的，因此有没有一种方法可以覆盖该方法?

However, since I got the WebView by using findViewById, is there a way to override the method?

P.S:实际上，这是一个更为复杂的情况，我无法在MainActivity中覆盖onKeyDown，因为它首先在WebView中调用onKeyDown.

P.S: It is actually a much more complicated case, and I can't Override onKeyDown in MainActivity, because it call the onKeyDown in WebView first.

推荐答案

如果要覆盖某些方法，则必须创建一个自定义的WebView类，该类为extends WebView.

If you want to override certain methods, you have to create a custom WebView class which extends WebView.

它看起来像这样:

public class CustomWebView extends WebView {

    public CustomWebView(Context context) {
        this(context, null);
    }

    public CustomWebView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        /* any initialisation work here */
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        /* your code here */
        return super.onKeyDown(keyCode, event);
    }

}

为此，您必须相应地更改XML布局文件:

For this to work, you have to change your XML layout file accordingly:

<com.example.stackoverflow.CustomWebView
    android:id="@+id/webview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

另外，在给WebView充气时，请确保将其转换为正确的类型，即CustomWebView.

Also, when you are inflating the WebView, make sure you are casting it to the correct type which is CustomWebView.

CustomWebView webView = (CustomWebView) findViewById(R.id.webview);

否则，您将得到一个java.lang.ClassCastException.

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