app, io: [wasm, android] add support for numeric/email keyboard mode

Previously, the on-screen keyboard always displays the text keyboard,
(QWERTY or equivalent).

For optimal user experience, it's possible to specify the keyboard type
using `InputHint`. The on-screen keyboard will provide shortcuts or
restrict what the user can input.

Due to some limitations (gio#116), only numeric and text keyboards are
supported on Android.

Signed-off-by: Inkeliz <inkeliz@inkeliz.com>

app/internal/wm/GioView.java

@@ -36,6 +36,7 @@ import android.view.inputmethod.BaseInputConnection;
 import android.view.inputmethod.InputConnection;
 import android.view.inputmethod.InputMethodManager;
 import android.view.inputmethod.EditorInfo;
+import android.text.InputType;
 
 import java.io.UnsupportedEncodingException;
 
@@ -47,6 +48,7 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 	private final InputMethodManager imm;
 	private final float scrollXScale;
 	private final float scrollYScale;
+	private int keyboardHint;
 
 	private long nhandle;
 
@@ -247,10 +249,20 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 		}
 	}
 
-	@Override public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
+	@Override public InputConnection onCreateInputConnection(EditorInfo editor) {
+		editor.inputType = this.keyboardHint;
+		editor.imeOptions = EditorInfo.IME_FLAG_NO_FULLSCREEN | EditorInfo.IME_FLAG_NO_EXTRACT_UI;
 		return new InputConnection(this);
 	}
 
+	void setInputHint(int hint) {
+	    if (hint == this.keyboardHint) {
+	        return;
+	    }
+	    this.keyboardHint = hint;
+	    imm.restartInput(this);
+	}
+
 	void showTextInput() {
 		GioView.this.requestFocus();
 		imm.showSoftInput(GioView.this, 0);