refactor source tree organization, switch to meson

src/api-impl/android/widget/ProgressBar.java

@@ -0,0 +1,25 @@
+package android.widget;
+
+import android.util.AttributeSet;
+import android.content.Context;
+
+import android.view.View;
+
+public class ProgressBar extends View {
+	public ProgressBar(AttributeSet attrs) {
+		super(attrs);
+
+		native_constructor(attrs);
+	}
+
+	public ProgressBar(Context context) {
+		super(context);
+
+//		native_constructor(context);
+	}
+
+	private native void native_constructor(AttributeSet attrs);
+	private native void native_constructor(Context context);
+
+	public synchronized void setIndeterminate(boolean indeterminate) {}
+}