I'm trying to share basic data between 2 applications using SharedPreferences.
I've created a Class that extends ContentProvider:
package com.chou.playground;
///imports...
public class SharedIdProvider extends ContentProvider {
static final String PROVIDER_NAME = BuildConfig.APPLICATION_ID + ".provider";
static final String URL = "content://" + PROVIDER_NAME + "/__hd";
static final int uriCode = 1;
static final UriMatcher uriMatcher;
static {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(PROVIDER_NAME, "/__hd", uriCode);
uriMatcher.addURI(PROVIDER_NAME, "/__hd/*", uriCode);
}
private transient static SharedPreferences prefs;
private transient static String hardwareId;
@Override
public String getType(@NotNull Uri uri) {
if (uriMatcher.match(uri) == uriCode) {
return PROVIDER_NAME + "/__hd";
}
throw new IllegalArgumentException("Unsupported URI: " + uri);
}
@Override
public boolean onCreate() {
Context context = getContext();
if (context != null) {
prefs = context.getSharedPreferences("rsa_application_key_prefs", 0);
hardwareId = getHardwareId(context);
context.getContentResolver().notifyChange(Uri.parse(URL), null);
return true;
}
return true;
}
public static void update(Context context, String value){
hardwareId = value;
storeHardwareID(context.getApplicationContext(), value);
}
static synchronized String getHardwareId(Context context) {
String hardwareId = null;
if (null != context) {
hardwareId = getStoredHardwareId(context.getApplicationContext());
if (TextUtils.isEmpty(hardwareId)) {
hardwareId = generateHardwareId();
storeHardwareID(context.getApplicationContext(), hardwareId);
}
}
return hardwareId;
}
private static void storeHardwareID(Context context, String hardwareId) {
if (prefs == null) {
Log.e("SdkPreferences", "unexpected error in storeHardwareID, can't get shared preferences");
} else {
SharedPreferences.Editor editor = prefs.edit();
editor.putString("com.aes.api.hardware_id", hardwareId);
editor.putBoolean("com.aes.api.can_be_sync", true);
editor.apply();
}
}
private static String getStoredHardwareId(Context context) {
if (prefs == null) {
Log.e("SdkPreferences", "unexpected error in getStoredHardwareId, can't get shared preferences");
return "INVALID";
} else {
return prefs.getString("com.aes.api.hardware_id", null);
}
}
private static String generateHardwareId() {
return UUID.randomUUID().toString();
}
@Override
public Cursor query(@NotNull Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
Context context = getContext();
MatrixCursor cursor = new MatrixCursor(new String[] { "__hd" });
cursor.addRow(new Object[]{ getCachedOrLoadHardwareId( context ) });
return cursor;
}
public static boolean canBeSynchronized() {
return prefs.getBoolean("com.aes.api.can_be_sync", false);
}
private String getCachedOrLoadHardwareId(Context context) {
if(hardwareId == null){
hardwareId = getHardwareId(context);
}
return hardwareId;
}
@Override
public Uri insert(@NotNull Uri uri, ContentValues values) {
return null;
}
@Override
public int update(@NotNull Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
return 0;
}
@Override
public int delete(@NotNull Uri uri, String selection, String[] selectionArgs) {
return 0;
}
}
also added the class reference in the AndroidManifest.xml:
<provider
android:authorities="${applicationId}.provider"
android:enabled="true"
android:exported="true"
android:grantUriPermissions="true"
android:name="com.chou.playground.SharedIdProvider">
</provider>
then in my MainActivity I'm trying to get the data:
private void trySyncWith() {
Uri kUri = Uri.parse("content://" + "com.chou.app1.provider" + "/__hd");
Context context = getBaseContext();
if (context != null) {
ContentResolver contentResolver = context.getContentResolver();
if (contentResolver != null) {
final Cursor cursor = contentResolver.query(kUri, null, null, null, null, null);
if (cursor != null && cursor.getCount() > 0) {
cursor.moveToNext();
String hardwareId = cursor.getString(0);
if (hardwareId != null) {
SharedIdProvider.update(context, hardwareId);
}
cursor.close();
}
}
}
}
everythings works fine when the app is the same, but when I change the applicationId in my gradle.build file in com.chou.app2, com.chou.app2 cannot find the first content provider, the log says: Failed to find provider info for com.chou.app1.provider
The strange thing it's that when I run from terminal:
adb shell content query --uri content://com.chou.app1.provider/__hd
then everything starts working properly even from the second app.
Someone can help me?