Add storage listeners

Author: kengoon

sjfirebase/jinterface/storage.py

@@ -0,0 +1,40 @@
+from jnius import PythonJavaClass, java_method
+
+__all__ = ("OnProgressListener", "OnPausedListener")
+
+
+class OnProgressListener(PythonJavaClass):
+    __javainterfaces__ = ["com/google/firebase/storage/OnProgressListener"]
+    __javacontext__ = "app"
+
+    def __init__(self, on_progress):
+        self.on_progress = on_progress
+
+    @java_method("(Ljava/lang/Object;)V")
+    def onProgress(self, snapshot):
+        self.on_progress(snapshot)
+
+
+class OnPausedListener(PythonJavaClass):
+    __javainterfaces__ = ["com/google/firebase/storage/OnPausedListener"]
+    __javacontext__ = "app"
+
+    def __init__(self, on_paused):
+        self.on_paused = on_paused
+
+    @java_method("(Ljava/lang/Object;)V")
+    def onPaused(self, snapshot):
+        self.on_paused(snapshot)
+
+
+class StreamDownloadTaskStreamProcessor(PythonJavaClass):
+    __javainterfaces__ = ["com/google/firebase/storage/StreamDownloadTask$StreamProcessor"]
+    __javacontext__ = "app"
+
+    def __init__(self, do_in_background):
+        self.do_in_background = do_in_background
+
+    @java_method("(Lcom/google/firebase/storage/StreamDownloadTask$TaskSnapshot;"
+                 "java/io/InputStream;)V")
+    def doInBackground(self, state, stream):
+        self.do_in_background(state, stream)