android - 使用 v7 支持库 AlertDialog 时 Robolectric InflateException

Question

使用普通的 android.app.AlertDialog 与 ShadowAlertDialog.getLatestAlertDialog() 一起工作，但是如果你使用支持库 android.support.v7.app .AlertDialog，则出现此异常:

android.view.InflateException: XML file app/build/intermediates/res/qa/debug/layout/abc_alert_dialog_material.xml line #-1 (sorry, not yet implemented): Error inflating class android.support.v7.internal.widget.DialogTitle
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:713)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
    at uk.co.chrisjenx.calligraphy.CalligraphyLayoutInflater.inflate(CalligraphyLayoutInflater.java:60)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
    at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:249)
    at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:75)
    at android.support.v7.app.AlertController.installContent(AlertController.java:216)
    at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:240)
    at android.app.Dialog.dispatchOnCreate(Dialog.java:361)
    at android.app.Dialog.show(Dialog.java:262)
    at org.robolectric.shadows.ShadowDialog.show(ShadowDialog.java:65)
    at android.app.Dialog.show(Dialog.java)
<snip>
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -9
    at java.lang.String.substring(String.java:1955)
    at org.robolectric.res.ResName.qualifyResName(ResName.java:51)
    at org.robolectric.res.Attribute.getStyleReference(Attribute.java:147)
    at org.robolectric.res.builder.XmlFileBuilder$XmlResourceParserImpl.getResourceId(XmlFileBuilder.java:789)

这是一个已知问题，但解决它的最佳方法是什么？
https://github.com/robolectric/robolectric/issues/1736

Answer 1

我使用静态实用程序构建我的 AlertDialog 对象，并在类路径上检测到 Robolectric 时构建一个 android.app.AlertDialog 对象。这是我的代码:

private static Boolean isRobolectricTest = null;

/**
 * Determines if we are running inside of Robolectric or not.
 */
public static boolean isARobolectricUnitTest() {
    if (isRobolectricTest == null) {
        try {
            Class.forName("org.robolectric.Robolectric");
            isRobolectricTest = true;
        } catch (ClassNotFoundException e) {
            isRobolectricTest = false;
        }
    }
    return isRobolectricTest;
}

/**
 * This utility helps us to workaround a Robolectric issue that causes our unit tests to fail
 * when an Activity/Fragment creates an AlertDialog using the v7 support library.  The
 * workaround is to use the normal android.app.AlertDialog when running Robolectric tests.
 *
 * The Robolectric bug is: https://github.com/robolectric/robolectric/issues/1736
 *   android.view.InflateException: XML file app/build/intermediates/res/qa/debug/layout/abc_alert_dialog_material.xml line #-1 (sorry, not yet implemented): Error inflating class android.support.v7.internal.widget.DialogTitle
 */
public static DialogInterface createAndShowDialog(Context context,
                                                  @StringRes int titleResId,
                                                  String message,
                                                  @StringRes int negativeTextResId,
                                                  DialogInterface.OnClickListener negativeClickListener,
                                                  @StringRes int neutralTextResId,
                                                  DialogInterface.OnClickListener neutralClickListener,
                                                  @StringRes int positiveTextResId,
                                                  DialogInterface.OnClickListener positiveClickListener,
                                                  boolean cancelable) {
    if (isARobolectricUnitTest()) {
        return UiUtils.createDialog(context, titleResId, message, negativeTextResId, negativeClickListener, neutralTextResId, neutralClickListener, positiveTextResId, positiveClickListener, cancelable);
    } else {
        return UiUtils.createDialogSupportV7(context, titleResId, message, negativeTextResId, negativeClickListener, neutralTextResId, neutralClickListener, positiveTextResId, positiveClickListener, cancelable);
    }
}

private static android.app.AlertDialog createDialog(Context context,
                                                    @StringRes int titleResId,
                                                    String message,
                                                    @StringRes int negativeTextResId,
                                                    DialogInterface.OnClickListener negativeClickListener,
                                                    @StringRes int neutralTextResId,
                                                    DialogInterface.OnClickListener neutralClickListener,
                                                    @StringRes int positiveTextResId,
                                                    DialogInterface.OnClickListener positiveClickListener,
                                                    boolean cancelable) {
    android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(context);
    builder.setTitle(titleResId);
    builder.setMessage(message);
    builder.setNegativeButton(negativeTextResId, negativeClickListener);

    if ((neutralTextResId != -1) && (neutralClickListener != null)) {
        builder.setNeutralButton(neutralTextResId, neutralClickListener);
    }

    builder.setPositiveButton(positiveTextResId, positiveClickListener);
    builder.setCancelable(cancelable);

    android.app.AlertDialog alertDialog = builder.create();
    alertDialog.show();

    return alertDialog;
}

private static android.support.v7.app.AlertDialog createDialogSupportV7(Context context,
                                                                        @StringRes int titleResId,
                                                                        String message,
                                                                        @StringRes int negativeTextResId,
                                                                        DialogInterface.OnClickListener negativeClickListener,
                                                                        @StringRes int neutralTextResId,
                                                                        DialogInterface.OnClickListener neutralClickListener,
                                                                        @StringRes int positiveTextResId,
                                                                        DialogInterface.OnClickListener positiveClickListener,
                                                                        boolean cancelable) {
    android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(context);
    builder.setTitle(titleResId);
    builder.setMessage(message);
    builder.setNegativeButton(negativeTextResId, negativeClickListener);

    if ((neutralTextResId != -1) && (neutralClickListener != null)) {
        builder.setNeutralButton(neutralTextResId, neutralClickListener);
    }

    builder.setPositiveButton(positiveTextResId, positiveClickListener);
    builder.setCancelable(cancelable);

    android.support.v7.app.AlertDialog alertDialog = builder.create();
    alertDialog.show();

    return alertDialog;
}

这并不理想，但它可以完成工作，并且在修复 Robolectric 问题后很容易删除黑客攻击。