Request scan media on push

After a file is pushed, send a broadcast to request the media scanner to
scan the "push target" directory.

In practice, this allows some apps to detect the new file immediately.

server/src/main/java/com/genymobile/scrcpy/ControlMessage.java

@@ -17,6 +17,7 @@ public final class ControlMessage {
     public static final int TYPE_SET_CLIPBOARD = 9;
     public static final int TYPE_SET_SCREEN_POWER_MODE = 10;
     public static final int TYPE_ROTATE_DEVICE = 11;
+    public static final int TYPE_SCAN_MEDIA = 12;
 
     private int type;
     private String text;
@@ -97,6 +98,13 @@ public final class ControlMessage {
         return msg;
     }
 
+    public static ControlMessage createScanMedia(String path) {
+        ControlMessage msg = new ControlMessage();
+        msg.type = TYPE_SCAN_MEDIA;
+        msg.text = path;
+        return msg;
+    }
+
     public static ControlMessage createEmpty(int type) {
         ControlMessage msg = new ControlMessage();
         msg.type = type;

server/src/main/java/com/genymobile/scrcpy/ControlMessageReader.java

@@ -76,6 +76,9 @@ public class ControlMessageReader {
             case ControlMessage.TYPE_SET_SCREEN_POWER_MODE:
                 msg = parseSetScreenPowerMode();
                 break;
+            case ControlMessage.TYPE_SCAN_MEDIA:
+                msg = parseScanMedia();
+                break;
             case ControlMessage.TYPE_EXPAND_NOTIFICATION_PANEL:
             case ControlMessage.TYPE_EXPAND_SETTINGS_PANEL:
             case ControlMessage.TYPE_COLLAPSE_PANELS:
@@ -182,6 +185,14 @@ public class ControlMessageReader {
         return ControlMessage.createSetScreenPowerMode(mode);
     }
 
+    private ControlMessage parseScanMedia() {
+        String path = parseString();
+        if (path == null) {
+            return null;
+        }
+        return ControlMessage.createScanMedia(path);
+    }
+
     private static Position readPosition(ByteBuffer buffer) {
         int x = buffer.getInt();
         int y = buffer.getInt();

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -1,5 +1,7 @@
 package com.genymobile.scrcpy;
 
+import android.content.Intent;
+import android.net.Uri;
 import android.os.Build;
 import android.os.SystemClock;
 import android.view.InputDevice;
@@ -7,6 +9,7 @@ import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 
+import java.io.File;
 import java.io.IOException;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
@@ -135,6 +138,13 @@ public class Controller {
             case ControlMessage.TYPE_ROTATE_DEVICE:
                 Device.rotateDevice();
                 break;
+            case ControlMessage.TYPE_SCAN_MEDIA:
+                String path = msg.getText();
+                @SuppressWarnings("deprecation")
+                Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
+                intent.setData(Uri.fromFile(new File(path)));
+                Device.sendBroadcast(intent);
+                break;
             default:
                 // do nothing
         }

server/src/test/java/com/genymobile/scrcpy/ControlMessageReaderTest.java

@@ -314,6 +314,26 @@ public class ControlMessageReaderTest {
         Assert.assertEquals(ControlMessage.TYPE_ROTATE_DEVICE, event.getType());
     }
 
+    @Test
+    public void testScanMedia() throws IOException {
+        ControlMessageReader reader = new ControlMessageReader();
+
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        DataOutputStream dos = new DataOutputStream(bos);
+        dos.writeByte(ControlMessage.TYPE_SCAN_MEDIA);
+        byte[] text = "/sdcard/Download/".getBytes(StandardCharsets.UTF_8);
+        dos.writeInt(text.length);
+        dos.write(text);
+
+        byte[] packet = bos.toByteArray();
+
+        reader.readFrom(new ByteArrayInputStream(packet));
+        ControlMessage event = reader.next();
+
+        Assert.assertEquals(ControlMessage.TYPE_SCAN_MEDIA, event.getType());
+        Assert.assertEquals("/sdcard/Download/", event.getText());
+    }
+
     @Test
     public void testMultiEvents() throws IOException {
         ControlMessageReader reader = new ControlMessageReader();