add Java APIs needed for WhatsApp MainActivity and ConversationActivity

src/api-impl/android/app/Activity.java

@@ -33,7 +33,7 @@ import java.util.Map;
 
 public class Activity extends ContextThemeWrapper implements Window.Callback {
 	LayoutInflater layout_inflater;
-	Window window = new Window(this);
+	Window window = new Window(this, this);
 	int requested_orientation = -1 /*ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED*/; // dummy
 	public Intent intent;
 	private Activity resultActivity;
@@ -369,9 +369,10 @@ public class Activity extends ContextThemeWrapper implements Window.Callback {
 		runOnUiThread(new Runnable() {
 			@Override
 			public void run() {
-				nativeFinish(getWindow().native_window);
-				getWindow().setContentView(null);
-				window = null;
+				if (window != null) {
+					nativeFinish(getWindow().native_window);
+					window = null;
+				}
 			}
 		});
 	}
@@ -529,6 +530,14 @@ public class Activity extends ContextThemeWrapper implements Window.Callback {
 
 	public void overridePendingTransition(int enterAnim, int exitAnim) {}
 
+	public boolean isTaskRoot() {
+		return false;
+	}
+
+	public void postponeEnterTransition() {}
+
+	public void startPostponedEnterTransition() {}
+
 	private native void nativeFinish(long native_window);
 	public static native void nativeRecreateActivity(Activity activity);
 	public static native void nativeStartActivity(Activity activity);

src/api-impl/android/app/ActivityManager.java

@@ -20,6 +20,10 @@ public class ActivityManager {
 		public long availMem = 10000;
 
 		public long totalMem = 10000;
+
+		public long threshold = 200;
+
+		public boolean lowMemory = false;
 	}
 
 	public void getMemoryInfo(MemoryInfo outInfo)

src/api-impl/android/app/DatePickerDialog.java

@@ -0,0 +1,6 @@
+package android.app;
+
+public class DatePickerDialog {
+
+	public interface OnDateSetListener {}
+}

src/api-impl/android/app/Dialog.java

@@ -27,7 +27,7 @@ public class Dialog implements Window.Callback, DialogInterface {
 	public Dialog(Context context, int themeResId) {
 		this.context = context;
 		nativePtr = nativeInit();
-		window = new Window(this);
+		window = new Window(context, this);
 		window.native_window = nativePtr;
 	}
 

src/api-impl/android/app/Notification.java

@@ -188,6 +188,8 @@ public class Notification implements Parcelable {
 
 			public Builder addExtras(Bundle extras) {return this;}
 
+			public Builder addRemoteInput(RemoteInput remoteInput) {return this;}
+
 			public Action build() {
 				return action;
 			}
@@ -210,5 +212,19 @@ public class Notification implements Parcelable {
 		public BigTextStyle setBigContentTitle(CharSequence title) {return this;}
 
 		public BigTextStyle bigText(CharSequence text) {return this;}
+
+		public BigTextStyle setSummaryText(CharSequence summaryText) {return this;}
+	}
+
+	public static class InboxStyle extends Style {
+
+		public InboxStyle(Notification.Builder builder) {}
+
+		public InboxStyle setBigContentTitle(CharSequence title) {return this;}
+
+		public InboxStyle setSummaryText(CharSequence summaryText) {return this;}
+
+		public InboxStyle addLine(CharSequence line) {return this;}
+
 	}
 }

src/api-impl/android/app/RemoteInput.java

@@ -0,0 +1,23 @@
+package android.app;
+
+import android.os.Bundle;
+
+public class RemoteInput {
+
+	public static class Builder {
+
+		public Builder(String resultKey) {}
+
+		public Builder setLabel(CharSequence label) {return this;}
+
+		public Builder setChoices(CharSequence[] choices) {return this;}
+
+		public Builder setAllowFreeFormInput(boolean allowFreeFormInput) {return this;}
+
+		public Builder addExtras(Bundle extras) {return this;}
+
+		public RemoteInput build() {
+			return new RemoteInput();
+		}
+	}
+}

src/api-impl/android/app/Service.java

@@ -40,4 +40,8 @@ public abstract class Service extends Context {
 	public void stopSelf() {
 		System.out.println("Service.stopSelf() called");
 	}
+
+	public void attachBaseContext(Context newBase) {
+		System.out.println("Service.attachBaseContext(" + newBase + ") called");
+	}
 }