Add a new method for text injection

On Android >= 7, inject text using the clipboard.

This is faster and allows to inject UTF-8.

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

@@ -149,6 +149,10 @@ public class Controller {
     }
 
     private int injectText(String text) {
+        if (device.injectTextPaste(text)) {
+            // The best method (fastest and UTF-8) worked!
+            return text.length();
+        }
         int successCount = 0;
         for (char c : text.toCharArray()) {
             if (!injectChar(c)) {

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

@@ -167,15 +167,44 @@ public final class Device {
         return injectEvent(event, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
     }
 
-    public boolean injectKeyEvent(int action, int keyCode, int repeat, int metaState) {
+    public boolean injectKeyEvent(int action, int keyCode, int repeat, int metaState, int mode) {
         long now = SystemClock.uptimeMillis();
         KeyEvent event = new KeyEvent(now, now, action, keyCode, repeat, metaState, KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0,
                 InputDevice.SOURCE_KEYBOARD);
-        return injectEvent(event);
+        return injectEvent(event, mode);
+    }
+
+    public boolean injectKeyEvent(int action, int keyCode, int repeat, int metaState) {
+        return injectKeyEvent(action, keyCode, repeat, metaState, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
+    }
+
+    public boolean injectKeycode(int keyCode, int mode) {
+        return injectKeyEvent(KeyEvent.ACTION_DOWN, keyCode, 0, 0) && injectKeyEvent(KeyEvent.ACTION_UP, keyCode, 0, 0, mode);
     }
 
     public boolean injectKeycode(int keyCode) {
-        return injectKeyEvent(KeyEvent.ACTION_DOWN, keyCode, 0, 0) && injectKeyEvent(KeyEvent.ACTION_UP, keyCode, 0, 0);
+        return injectKeycode(keyCode, InputManager.INJECT_INPUT_EVENT_MODE_ASYNC);
+    }
+
+    public boolean injectTextPaste(String text) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
+            return false;
+        }
+
+        // On Android >= 7, we can inject UTF-8 text as follow:
+        // - set the clipboard
+        // - inject the PASTE key event
+        // - restore the clipboard
+
+        String clipboardBackup = getClipboardText();
+        isSettingClipboard.set(true);
+
+        rawSetClipboardText(text);
+        boolean ok = injectKeycode(KeyEvent.KEYCODE_PASTE, InputManager.INJECT_INPUT_EVENT_MODE_WAIT_FOR_RESULT);
+        rawSetClipboardText(clipboardBackup);
+
+        isSettingClipboard.set(false);
+        return ok;
     }
 
     public boolean isScreenOn() {
@@ -206,9 +235,13 @@ public final class Device {
         return s.toString();
     }
 
+    private boolean rawSetClipboardText(String text) {
+        return serviceManager.getClipboardManager().setText(text);
+    }
+
     public boolean setClipboardText(String text) {
         isSettingClipboard.set(true);
-        boolean ok = serviceManager.getClipboardManager().setText(text);
+        boolean ok = rawSetClipboardText(text);
         isSettingClipboard.set(false);
         return ok;
     }