create ContentProvider from AndroidManifest.xml

This is required for androidx startup library.
Only onCreate method is called for now.

src/api-impl/android/content/ContentProvider.java

@@ -0,0 +1,31 @@
+package android.content;
+
+import java.util.List;
+
+import com.reandroid.arsc.chunk.xml.AndroidManifestBlock;
+import com.reandroid.arsc.chunk.xml.ResXmlElement;
+
+public class ContentProvider {
+
+	static void createContentProviders() throws ReflectiveOperationException {
+		List<ResXmlElement> providers = Context.manifest.getApplicationElement().listElements(AndroidManifestBlock.TAG_provider);
+		System.out.println(providers);
+		for (ResXmlElement providerElement : providers) {
+			String providerName = providerElement.searchAttributeByResourceId(AndroidManifestBlock.ID_name).getValueAsString();
+			if (providerName.startsWith(".")) {
+				providerName = Context.manifest.getPackageName() + providerName;
+			}
+			System.out.println("creating " + providerName);
+			Class<? extends ContentProvider> providerCls = Class.forName(providerName).asSubclass(ContentProvider.class);
+			ContentProvider provider = providerCls.getConstructor().newInstance();
+			provider.onCreate();
+		}
+	}
+
+	public boolean onCreate() {return false;}
+
+	public Context getContext() {
+		return Context.this_application;
+	}
+
+}