Question

我的应用无法从People.CONTENT_URI获取任何内容。插入成功，结果为：“URI = content：// contacts / people / 15” 光标打印为：

"cursor=>>>>> Dumping cursor android.content.ContentResolver$CursorWrapperInner@d1caa72
<<<<<
position=-1

我在查询后尝试使用游标moveToFirst，结果日志显示：

cursor=>>>>> Dumping cursor android.content.ContentResolver$CursorWrapperInner@d1caa72
<<<<<
position=0

代码段：

import android.provider.Contacts.People;

final ContentResolver mResolver = mContext.getContentResolver();
mResolver.delete(People.CONTENT_URI, null, null);
final ContentValues valuse = new ContentValues();
valuse.put(People._ID, "1");
valuse.put(People.NAME, "name");
Uri uri = mResolver.insert(People.CONTENT_URI, valuse);
Log.d("MyApp","preparePeople: URI=" +uri);

private final String[] mPROJECTION = new String[] {
        People._ID, People.NAME
};
final Cursor c = mContext.getContentResolver().query(People.CONTENT_URI, mPROJECTION, null, null, null);
Log.i("MyApp","cursor=" + DatabaseUtils.dumpCursorToString(c) + "  position=" + c.getPosition());

请告诉我我的代码段有什么问题。光标输出未显示插入的任何值。

Answer 1

您正在从光标中获取数据，但您没有告诉光标从哪个位置获取，默认光标指向-1位置。

所以，你必须使用，

c.moveToFirst();

获取光标后。

Android ContentResolver查询提供错误输出

1 个答案: