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POWhat to do in custom ContentProvider's fillWindow() method?
 

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  1. POWhat to do in custom ContentProvider's fillWindow() method?
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    <p>I'm writing a custom ContentProvider that serves up content consisting of a single, constant string which I represent as a one-row table having columns _id = 0 and value = "SomeString". This string is not stored in a database, so I developed a subclass of CrossProcessCursor that has does everything required to behave like what I described above.</p> <p>The documentation for CrossProcessCursor is very sparse and doesn't really explain what the fillWindow() method should be doing beyond the obvious. Based on the descriptions of CursorWindow's methods, I put the following together, which I thought should cover it:</p> <pre><code>public class MyCursor implements CrossProcessCursor { ... public void fillWindow(int pos, CursorWindow window) { if (pos != 0) { // There's only one row. return; } window.clear(); window.allocRow(); // TODO: Error check, false = no memory window.setNumColumns(2); window.setStartPosition(0); window.putLong(0, 0, 0); window.putString("SomeString", 0, 1); } } </code></pre> <p>As expected, it gets called with pos = 0 when a client application requests the content, but the client application throws an exception when it tries to go after the first (and only) row:</p> <pre><code>Caused by: java.lang.IllegalStateException: UNKNOWN type 48 at android.database.CursorWindow.getLong_native(Native Method) at android.database.CursorWindow.getLong(CursorWindow.java:380) at android.database.AbstractWindowedCursor.getLong(AbstractWindowedCursor.java:108) at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:194) at android.database.AbstractCursor.moveToFirst(AbstractCursor.java:248) at android.database.CursorWrapper.moveToFirst(CursorWrapper.java:86) ...(Snipped)... </code></pre> <p>Could anyone shed some light on what this method should be doing to return a correct-looking row to the client?</p> <p>Thanks.</p>
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