ADD: Permissions.has()

library/src/main/java/com/oasisfeng/android/content/pm/Permissions.java

@@ -0,0 +1,17 @@
+package com.oasisfeng.android.content.pm;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Process;
+
+/**
+ * Permission-related helpers
+ *
+ * Created by Oasis on 2016/9/27.
+ */
+public class Permissions {
+
+	public static boolean has(final Context context, final String permission) {
+		return context.checkPermission(permission, Process.myPid(), Process.myUid()) == PackageManager.PERMISSION_GRANTED;
+	}
+}