Add a FontsProvider that always returns the default font

play-services-core/src/main/AndroidManifest.xml

@@ -464,6 +464,12 @@
             android:authorities="com.google.android.gms.chimera"
             android:exported="true" />
 
+        <!-- Fonts -->
+        <provider
+            android:name="org.microg.gms.fonts.FontsProvider"
+            android:authorities="com.google.android.gms.fonts"
+            android:exported="true"/>
+
         <!-- microG Settings shown in Launcher -->
         <activity
             android:name="org.microg.gms.ui.SettingsActivity"

play-services-core/src/main/kotlin/org/microg/gms/fonts/FontsProvider.kt

@@ -0,0 +1,97 @@
+/*
+ * SPDX-FileCopyrightText: 2020, microG Project Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.microg.gms.fonts
+
+import android.content.ContentProvider
+import android.content.ContentValues
+import android.database.Cursor
+import android.database.MatrixCursor
+import android.net.Uri
+import android.os.Bundle
+import android.os.ParcelFileDescriptor
+import android.os.ParcelFileDescriptor.MODE_READ_ONLY
+import android.util.Log
+import java.io.File
+
+class FontsProvider : ContentProvider() {
+
+    override fun onCreate(): Boolean {
+        Log.d(TAG, "onCreate")
+        return true
+    }
+
+    override fun call(method: String, arg: String?, extras: Bundle?): Bundle? {
+        Log.d(TAG, "call $method $arg $extras")
+        return null
+    }
+
+    override fun query(
+        uri: Uri,
+        projection: Array<out String>?,
+        selection: String?,
+        selectionArgs: Array<out String>?,
+        sortOrder: String?
+    ): Cursor {
+        Log.e(TAG, "query: $uri ${projection?.toList()} $selection")
+        val cursor = MatrixCursor(COLUMNS)
+        // We could also return an empty cursor here, but some apps have been reported to crash
+        // when their expected font is not returned by Google's font provider.
+        cursor.addRow(
+            arrayOf(
+                1337L, // file_id
+                0, // font_ttc_index
+                null, // font_variation_settings
+                400, // font_weight
+                0, // font_italic
+                0, // result_code: RESULT_CODE_OK
+            )
+        )
+        return cursor
+    }
+
+    override fun insert(uri: Uri, values: ContentValues?): Uri {
+        Log.d(TAG, "insert: $uri, $values")
+        return uri
+    }
+
+    override fun update(
+        uri: Uri,
+        values: ContentValues?,
+        selection: String?,
+        selectionArgs: Array<out String>?
+    ): Int {
+        Log.d(TAG, "update: $uri, $values, $selection, $selectionArgs")
+        return 0
+    }
+
+    override fun delete(uri: Uri, selection: String?, selectionArgs: Array<out String>?): Int {
+        Log.d(TAG, "delete: $uri, $selection, $selectionArgs")
+        return 0
+    }
+
+    override fun getType(uri: Uri): String {
+        Log.d(TAG, "getType: $uri")
+        return "font/ttf"
+    }
+
+    override fun openFile(uri: Uri, mode: String): ParcelFileDescriptor? {
+        Log.d(TAG, "openFile: $uri mode: $mode")
+        val file = File("/system/fonts/Roboto-Regular.ttf")
+        return ParcelFileDescriptor.open(file, MODE_READ_ONLY)
+    }
+
+    companion object {
+        private const val TAG = "FontsProvider"
+        private val COLUMNS = arrayOf(
+            "file_id",
+            "font_ttc_index",
+            "font_variation_settings",
+            "font_weight",
+            "font_italic",
+            "result_code"
+        )
+    }
+}