Android 从类访问活动WebView

为什么返回空值：

public class ReadPage extends AppCompatActivity {

    ReadPage activityRead;
 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_read_page);
        ReadPage = this;

        new LoaderController(readPage);
    }

和装载机控制器：

 public LoaderController(ReadPage activity) {
        ObservableWebView wv = (ObservableWebView) activity.findViewById(R.id.webView);
        wv.setWebChromeClient(new WebChromeClient());
        wv.setWebViewClient(new WebViewClient());
        wv.getSettings().setJavaScriptEnabled(true);
        wv.loadUrl("www.google.com");
    }
}


 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.webkit.WebSettings.....ObservableWebView.getSettings()' on a null object reference

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好的，我明白了，但既然我传递了真实的活动，为什么为空？

这可能是因为您的web视图没有正确初始化。请这样尝试-新建LoaderController（（ReadPage）this）；