android – Instrumentation测试WebView

我希望在InstrumentationTest中构建一个自定义WebView,然后检查是否已完成正确的初始化.

我的自定义WebView:

public class InteractiveWebView extends WebView
{
    public InteractiveWebView(final Context context)
    {
        super(context);
        initialise(context);
    }

    public InteractiveWebView(final Context context, final AttributeSet attrs)
    {
        super(context, attrs);
        initialise(context);
    }

    public InteractiveWebView(final Context context, final AttributeSet attrs, final int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        initialise(context);
    }

    private void initialise(final Context context)
    {
        if (!isInEditMode())
        {
            if (Build.VERSION.SDK_INT >= 19)
            {
                setLayerType(View.LAYER_TYPE_HARDWARE, null);
            }
            else
            {
                setLayerType(View.LAYER_TYPE_SOFTWARE, null);
            }

            setScrollBarStyle(WebView.SCROLLBARS_INSIDE_OVERLAY);
            setFocusable(true);
            setFocusableInTouchMode(true);
            requestFocus(View.FOCUS_DOWN);

            WebSettings settings = getSettings();

            settings.setJavaScriptEnabled(true);
            settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
            settings.setSupportMultipleWindows(false);
            settings.setDomStorageEnabled(true);
            settings.setDatabaseEnabled(true);
            settings.setSupportZoom(false);
            settings.setUseWideViewPort(false);

            String databasePath = context.getApplicationContext().getDir("database", Context.MODE_PRIVATE).getPath();
            settings.setDatabasePath(databasePath);
        }
    }
}

InstrumentationTest:

@RunWith(AndroidJUnit4.class)
@SmallTest
public class InteractiveWebViewTest
{
    @Test
    public void constructors()
    {
        Context baseContext = InstrumentationRegistry.getContext();

        InteractiveWebView webView1 = new InteractiveWebView(baseContext);
        InteractiveWebView webView2 = new InteractiveWebView(baseContext, null);
        InteractiveWebView webView3 = new InteractiveWebView(baseContext, null, 1);
    }
}

正如你所看到的,我现在还没有断言任何东西.

我面临的问题是,当我调用第一个WebView构造函数时,我收到以下错误:

java.lang.NullPointerException: Attempt to read from field 'android.os.MessageQueue android.os.Looper.mQueue' on a null object reference
at android.os.Handler.<init>(Handler.java:229)
at android.os.Handler.<init>(Handler.java:137)
at org.chromium.base.ThreadUtils.setUiThread(ThreadUtils.java:39)
at com.android.webview.chromium.WebViewChromiumFactoryProvider.ensureChromiumStartedLocked(WebViewChromiumFactoryProvider.java:197)
at com.android.webview.chromium.WebViewChromiumFactoryProvider.startYourEngines(WebViewChromiumFactoryProvider.java:294)
at com.android.webview.chromium.WebViewChromium.init(WebViewChromium.java:218)
at android.webkit.WebView.<init>(WebView.java:606)
at android.webkit.WebView.<init>(WebView.java:542)
at android.webkit.WebView.<init>(WebView.java:525)
at android.webkit.WebView.<init>(WebView.java:512)
at android.webkit.WebView.<init>(WebView.java:502)
at android.mobileconnect.gsma.com.library.view.InteractiveWebView.<init>(InteractiveWebView.java:17)

当我点击第17行的InteractiveWebView链接时,它会转到该类中的构造函数并指向super(context);呼叫.

我已经尝试了许多其他方法,例如将InstrumentationTest扩展为ActivityInstrumentationTestCase2类型,以防它的上下文出现为null但我仍然得到相同的错误.我已经多次搜索过这个问题,但似乎无法根据我发现的问题解决问题.

我出错的任何想法?

最佳答案 通过模拟InteractiveWebView解决了这个问题,但确保它是在主UI线程上运行的Runnable中构建的:

getActivity().runOnUiThread(new Runnable()
{
    @Override
    public void run()
    {
        // Given
        InteractiveWebView interactiveWebView = new InteractiveWebView(getActivity());
        ....
        ....
        ....
        ....
    }
}
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