我正在实施我的第一个内容提供者。尝试检索某些内容时卡住了。似乎 UriMatcher 无法匹配我通过的 uri。
这是 MyContentProvider 类:
public class MyContentProvider extends ContentProvider {
private DataBaseHelper database;
static final String TAG = "CONTENT";
// Used for the UriMacher
public static final int ALL = 10;
public static final String AUTHORITY = "my.provider";
private static final String BASE_PATH = "resources";
public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY
+ "/" + BASE_PATH);
public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE
+ "/all";
public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE
+ "/one";
private static final UriMatcher sURIMatcher = new UriMatcher(UriMatcher.NO_MATCH);
static {
sURIMatcher.addURI(AUTHORITY, BASE_PATH , ALL);
}
@Override
public boolean onCreate() {
database = new DataBaseHelper(getContext());
return true;
}
@Override
public String getType(Uri uri) {
String ret = getContext().getContentResolver().getType(CONTENT_URI);
Log.i(TAG, "getType returning: " + ret);
return ret;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
// Uisng SQLiteQueryBuilder instead of query() method
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
// Set the table
queryBuilder.setTables(DataBaseHelper.MYTABLE);
int uriType = sURIMatcher.match(uri);
switch (uriType) {
case ALL:
break;
default:
// THIS LINE THROWS EXCEPTION!!
throw new IllegalArgumentException("Unknown URI: " + uri);
}
SQLiteDatabase db = database.getWritableDatabase();
Cursor cursor = queryBuilder.query(db, projection, selection,
selectionArgs, null, null, sortOrder);
// Make sure that potential listeners are getting notified
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
}
}
这是我在查询 MyContentProvider 时使用的代码
Uri.Builder builder = new Uri.Builder();
builder.scheme ("content");
builder.authority(MyContentProvider.AUTHORITY);
//builder.path (inURI.getPath ());
builder.path("resources");
builder.appendPath(""+MyContentProvider.ALL);
Uri uri = builder.build();
Cursor cursor = getContentResolver().query(uri, null, null, null,
null);
在这里我的logcat:
03-19 10:43:49.204: E/AndroidRuntime(12430): FATAL EXCEPTION: main
03-19 10:43:49.204: E/AndroidRuntime(12430): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.package/my.package.MainActivity}: java.lang.IllegalArgumentException: Unknown URI: content://falcofinder.android.memorapp/resources/10
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.os.Handler.dispatchMessage(Handler.java:99)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.os.Looper.loop(Looper.java:130)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.ActivityThread.main(ActivityThread.java:3835)
03-19 10:43:49.204: E/AndroidRuntime(12430): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 10:43:49.204: E/AndroidRuntime(12430): at java.lang.reflect.Method.invoke(Method.java:507)
03-19 10:43:49.204: E/AndroidRuntime(12430): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
03-19 10:43:49.204: E/AndroidRuntime(12430): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
03-19 10:43:49.204: E/AndroidRuntime(12430): at dalvik.system.NativeStart.main(Native Method)
03-19 10:43:49.204: E/AndroidRuntime(12430): Caused by: java.lang.IllegalArgumentException: Unknown URI: content://my.provider/resources/10
03-19 10:43:49.204: E/AndroidRuntime(12430): at my.package.MyContentProvider.query(MyContentProvider.java:95)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.content.ContentProvider$Transport.query(ContentProvider.java:187)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.content.ContentResolver.query(ContentResolver.java:271)
03-19 10:43:49.204: E/AndroidRuntime(12430): at my.package.MainActivity.onCreate(MainActivity.java:95)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-19 10:43:49.204: E/AndroidRuntime(12430): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
03-19 10:43:49.204: E/AndroidRuntime(12430): ... 11 more
感谢帮助。