Handle "show touches" on the device-side

Now that the server can access the Android settings and clean up
properly, handle the "show touches" option from the server.

The initial state is now correctly restored, even on device
disconnection.

README.md

@@ -429,7 +429,8 @@ device).
 
 Android provides this feature in _Developers options_.
 
-_Scrcpy_ provides an option to enable this feature on start and disable on exit:
+_Scrcpy_ provides an option to enable this feature on start and restore the
+initial value on exit:
 
 ```bash
 scrcpy --show-touches

app/scrcpy.1

@@ -136,7 +136,7 @@ Turn the device screen off immediately.
 
 .TP
 .B \-t, \-\-show\-touches
-Enable "show touches" on start, disable on quit.
+Enable "show touches" on start, restore the initial value on exit..
 
 It only shows physical touches (not clicks from scrcpy).
 

app/src/cli.c

@@ -130,7 +130,8 @@ scrcpy_print_usage(const char *arg0) {
         "        Turn the device screen off immediately.\n"
         "\n"
         "    -t, --show-touches\n"
-        "        Enable \"show touches\" on start, disable on quit.\n"
+        "        Enable \"show touches\" on start, restore the initial value\n"
+        "        on exit.\n"
         "        It only shows physical touches (not clicks from scrcpy).\n"
         "\n"
         "    -v, --version\n"

app/src/scrcpy.c

@@ -229,21 +229,6 @@ event_loop(bool display, bool control) {
     return false;
 }
 
-static process_t
-set_show_touches_enabled(const char *serial, bool enabled) {
-    const char *value = enabled ? "1" : "0";
-    const char *const adb_cmd[] = {
-        "shell", "settings", "put", "system", "show_touches", value
-    };
-    return adb_execute(serial, adb_cmd, ARRAY_LEN(adb_cmd));
-}
-
-static void
-wait_show_touches(process_t process) {
-    // reap the process, ignore the result
-    process_check_success(process, "show_touches");
-}
-
 static SDL_LogPriority
 sdl_priority_from_av_level(int level) {
     switch (level) {
@@ -292,19 +277,12 @@ scrcpy(const struct scrcpy_options *options) {
         .lock_video_orientation = options->lock_video_orientation,
         .control = options->control,
         .display_id = options->display_id,
+        .show_touches = options->show_touches,
     };
     if (!server_start(&server, options->serial, &params)) {
         return false;
     }
 
-    process_t proc_show_touches = PROCESS_NONE;
-    bool show_touches_waited;
-    if (options->show_touches) {
-        LOGI("Enable show_touches");
-        proc_show_touches = set_show_touches_enabled(options->serial, true);
-        show_touches_waited = false;
-    }
-
     bool ret = false;
 
     bool fps_counter_initialized = false;
@@ -421,11 +399,6 @@ scrcpy(const struct scrcpy_options *options) {
         }
     }
 
-    if (options->show_touches) {
-        wait_show_touches(proc_show_touches);
-        show_touches_waited = true;
-    }
-
     input_manager.prefer_text = options->prefer_text;
 
     ret = event_loop(options->display, options->control);
@@ -482,16 +455,6 @@ scrcpy(const struct scrcpy_options *options) {
         fps_counter_destroy(&fps_counter);
     }
 
-    if (options->show_touches) {
-        if (!show_touches_waited) {
-            // wait the process which enabled "show touches"
-            wait_show_touches(proc_show_touches);
-        }
-        LOGI("Disable show_touches");
-        proc_show_touches = set_show_touches_enabled(options->serial, false);
-        wait_show_touches(proc_show_touches);
-    }
-
     server_destroy(&server);
 
     return ret;

app/src/server.c

@@ -268,6 +268,7 @@ execute_server(struct server *server, const struct server_params *params) {
         "true", // always send frame meta (packet boundaries + timestamp)
         params->control ? "true" : "false",
         display_id_string,
+        params->show_touches ? "true" : "false",
     };
 #ifdef SERVER_DEBUGGER
     LOGI("Server debugger waiting for a client on device port "

app/src/server.h

@@ -51,6 +51,7 @@ struct server_params {
     int8_t lock_video_orientation;
     bool control;
     uint16_t display_id;
+    bool show_touches;
 };
 
 // init default values

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

@@ -19,19 +19,18 @@ private CleanUp() {
         // not instantiable
     }
 
-    public static void configure() throws IOException {
-        // TODO
-        boolean needProcess = false;
+    public static void configure(boolean disableShowTouches) throws IOException {
+        boolean needProcess = disableShowTouches;
         if (needProcess) {
-            startProcess();
+            startProcess(disableShowTouches);
         } else {
             // There is no additional clean up to do when scrcpy dies
             unlinkSelf();
         }
     }
 
-    private static void startProcess() throws IOException {
-        String[] cmd = {"app_process", "/", CleanUp.class.getName()};
+    private static void startProcess(boolean disableShowTouches) throws IOException {
+        String[] cmd = {"app_process", "/", CleanUp.class.getName(), String.valueOf(disableShowTouches)};
 
         ProcessBuilder builder = new ProcessBuilder(cmd);
         builder.environment().put("CLASSPATH", SERVER_PATH);
@@ -57,6 +56,15 @@ public static void main(String... args) {
         }
 
         Ln.i("Cleaning up");
-        // TODO
+
+        boolean disableShowTouches = Boolean.parseBoolean(args[0]);
+
+        if (disableShowTouches) {
+            ServiceManager serviceManager = new ServiceManager();
+            try (ContentProvider settings = serviceManager.getActivityManager().createSettingsProvider()) {
+                Ln.i("Disabling \"show touches\"");
+                settings.putValue(ContentProvider.TABLE_SYSTEM, "show_touches", "0");
+            }
+        }
     }
 }

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

@@ -12,6 +12,7 @@ public class Options {
     private boolean sendFrameMeta; // send PTS so that the client may record properly
     private boolean control;
     private int displayId;
+    private boolean showTouches;
 
     public int getMaxSize() {
         return maxSize;
@@ -84,4 +85,12 @@ public int getDisplayId() {
     public void setDisplayId(int displayId) {
         this.displayId = displayId;
     }
+
+    public boolean getShowTouches() {
+        return showTouches;
+    }
+
+    public void setShowTouches(boolean showTouches) {
+        this.showTouches = showTouches;
+    }
 }

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

@@ -1,5 +1,7 @@
 package com.genymobile.scrcpy;
 
+import com.genymobile.scrcpy.wrappers.ContentProvider;
+
 import android.graphics.Rect;
 import android.media.MediaCodec;
 import android.os.Build;
@@ -17,7 +19,16 @@ private static void scrcpy(Options options) throws IOException {
         Ln.i("Device: " + Build.MANUFACTURER + " " + Build.MODEL + " (Android " + Build.VERSION.RELEASE + ")");
         final Device device = new Device(options);
 
-        CleanUp.configure();
+        boolean mustDisableShowTouchesOnCleanUp = false;
+        if (options.getShowTouches()) {
+            try (ContentProvider settings = device.createSettingsProvider()) {
+                String oldValue = settings.getAndPutValue(ContentProvider.TABLE_SYSTEM, "show_touches", "1");
+                // If "show touches" was disabled, it must be disabled back on clean up
+                mustDisableShowTouchesOnCleanUp = !"1".equals(oldValue);
+            }
+        }
+
+        CleanUp.configure(mustDisableShowTouchesOnCleanUp);
 
         boolean tunnelForward = options.isTunnelForward();
         try (DesktopConnection connection = DesktopConnection.open(device, tunnelForward)) {
@@ -80,8 +91,9 @@ private static Options createOptions(String... args) {
                     "The server version (" + BuildConfig.VERSION_NAME + ") does not match the client " + "(" + clientVersion + ")");
         }
 
-        if (args.length != 10) {
-            throw new IllegalArgumentException("Expecting 10 parameters");
+        final int expectedParameters = 11;
+        if (args.length != expectedParameters) {
+            throw new IllegalArgumentException("Expecting " + expectedParameters + " parameters");
         }
 
         Options options = new Options();
@@ -114,6 +126,9 @@ private static Options createOptions(String... args) {
         int displayId = Integer.parseInt(args[9]);
         options.setDisplayId(displayId);
 
+        boolean showTouches = Boolean.parseBoolean(args[10]);
+        options.setShowTouches(showTouches);
+
         return options;
     }