Android损坏的XML解析示例

Question

从APIv.11发布开始，Android SDK就包含了also referenced from the official site的XmlAdapter示例。这个示例现在至少出现在3个文件夹中: android-11，android-12和android-13。而且它已经坏了。主要的(但不仅仅是)问题是它声明了一个无处可寻的android.content.XmlDocumentProvider提供程序，包括https://android.googlesource.com

在Adapters.java中也存在编译问题

mContext cannot be resolved to a variable   line 973
mFrom cannot be resolved to a variable  line 938
mTo cannot be resolved to a variable    line 937
mTo cannot be resolved to a variable    line 939

在android-developers上与此相关的问题很少，但没有答案。有没有人设法跟踪这个难以捉摸的XmlDocumentProvider并使样本工作？最重要的是--亲爱的Android团队，你能修复这个样本或者把它拉出来吗？

Answer 1

缺失的XmlDocumentProvider现在随SDK14中的示例一起发布，该项目将针对SDK8及更高版本进行编译。但是，要成功运行它，您必须修改清单以指向正确的提供者：

<provider android:name="com.example.android.xmladapters.XmlDocumentProvider"
       android:authorities="xmldocument" />

Answer 2

除了杰夫·吉尔费尔特指出的修复AndroidManifest.xml之外，您还可以更改Adapters.java (显示错误的文件)中的代码XmlCursorAdapter类，如下所示：

/**
 * Implementation of a Cursor adapter defined in XML. This class is a thin wrapper
 * of a SimpleCursorAdapter. The main difference is the ability to handle CursorBinders.
 */
private static class XmlCursorAdapter extends SimpleCursorAdapter implements ManagedAdapter {
    private Context mContext;
    private String mUri;
    private final String mSelection;
    private final String[] mSelectionArgs;
    private final String mSortOrder;
    private final int[] mTo;
    private final String[] mFrom;
    private final String[] mColumns;
    private final CursorBinder[] mBinders;
    private AsyncTask<Void,Void,Cursor> mLoadTask;



    XmlCursorAdapter(Context context, int layout, String uri, String[] from, int[] to,
            String selection, String[] selectionArgs, String sortOrder,
            HashMap<String, CursorBinder> binders) {

        super(context, layout, null, from, to);
        mContext = context;
        mUri = uri;
        mFrom = from;
        mTo = to;
        mSelection = selection;
        mSelectionArgs = selectionArgs;
        mSortOrder = sortOrder;
        mColumns = new String[from.length + 1];
        // This is mandatory in CursorAdapter
        mColumns[0] = "_id";
        System.arraycopy(from, 0, mColumns, 1, from.length);

        CursorBinder basic = new StringBinder(context, new IdentityTransformation(context));
        final int count = from.length;
        mBinders = new CursorBinder[count];

        for (int i = 0; i < count; i++) {
            CursorBinder binder = binders.get(from[i]);
            if (binder == null) binder = basic;
            mBinders[i] = binder;
        }
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        final int count = mTo.length;
        final int[] to = mTo;
        final CursorBinder[] binders = mBinders;

        for (int i = 0; i < count; i++) {
            final View v = view.findViewById(to[i]);
            if (v != null) {
                binders[i].bind(v, cursor, cursor.getColumnIndex(mFrom[i]));
            }
        }
    }
    ......
    ......
    ......

我从这里找到的代码中得到了答案：

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/4.0.1_r1/com/example/android/xmladapters/Adapters.java?av=f

Answer 3

我从罗曼·盖伊那里得到了答案。我昨天打开的标签现在有一个状态标签: FutureRelease，我想这意味着他们将在下一个版本中修复它。有关添加的参考资料，请单击此处的链接，链接到有关android-developers的讨论