Log to android logger and stdout/stderr

server/src/com/genymobile/scrcpy/Ln.java

@@ -0,0 +1,37 @@
+package com.genymobile.scrcpy;
+
+import android.util.Log;
+
+/**
+ * Log both to Android logger (so that logs are visible in "adb logcat") and standard output/error (so that they are visible in the terminal
+ * directly).
+ */
+public class Ln {
+
+    private static final String TAG = "scrcpy";
+
+    private Ln() {
+        // not instantiable
+    }
+
+    public static void d(String message) {
+        Log.d(TAG, message);
+        System.out.println("DEBUG: " + message);
+    }
+
+    public static void i(String message) {
+        Log.i(TAG, message);
+        System.out.println("INFO: " + message);
+    }
+
+    public static void w(String message) {
+        Log.w(TAG, message);
+        System.out.println("WARN: " + message);
+    }
+
+    public static void e(String message, Throwable throwable) {
+        Log.e(TAG, message, throwable);
+        System.out.println("ERROR: " + message);
+        throwable.printStackTrace();
+    }
+}

server/src/com/genymobile/scrcpy/ScrCpyServer.java

@@ -4,6 +4,8 @@ import java.io.IOException;
 
 public class ScrCpyServer {
 
+    private static final String TAG = "scrcpy";
+
     public static void scrcpy() throws IOException {
         String deviceName = DeviceUtil.getDeviceName();
         ScreenInfo initialScreenInfo = DeviceUtil.getScreenInfo();
@@ -13,8 +15,7 @@ public class ScrCpyServer {
             try {
                 new ScreenStreamer(connection).streamScreen();
             } catch (IOException e) {
-                System.err.println("Screen streaming interrupted: " + e.getMessage());
-                System.err.flush();
+                Ln.e("Screen streaming interrupted", e);
             }
         }
     }