Add text streamer to Android example to replace missing stdout

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@13833 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/android/extend/jni/example.cpp

@@ -2,3 +2,13 @@
 
 #include "example.h"
 
+static Streamer * streamerInstance = 0;
+
+void setStreamer(Streamer* streamer) {
+  streamerInstance = streamer;
+}
+
+Streamer& getStreamer() {
+  return *streamerInstance;
+}
+

Examples/android/extend/jni/example.h

@@ -5,6 +5,21 @@
 #include <vector>
 #include <string>
 #include <cmath>
+#include <sstream>
+
+struct Streamer {
+  virtual void display(std::string text) const = 0;
+  virtual ~Streamer() {}
+};
+void setStreamer(Streamer* streamer);
+Streamer& getStreamer();
+
+template<typename T> Streamer& operator<<(Streamer& stream, T const& val) {
+  std::ostringstream s;
+  s << val;
+  stream.display(s.str());
+  return stream;
+}
 
 class Employee {
 private:
@@ -14,7 +29,7 @@ public:
 	virtual std::string getTitle() { return getPosition() + " " + getName(); }
 	virtual std::string getName() { return name; }
 	virtual std::string getPosition() const { return "Employee"; }
-	virtual ~Employee() { printf("~Employee() @ %p\n", this); }
+	virtual ~Employee() { getStreamer() << "~Employee() @ " << this << "\n"; }
 };
 
 
@@ -35,10 +50,10 @@ public:
 	}
 	void addEmployee(Employee *p) {
 		list.push_back(p);
-		std::cout << "New employee added.   Current employees are:" << std::endl;
+		getStreamer() << "New employee added.   Current employees are:" << "\n";
 		std::vector<Employee*>::iterator i;
 		for (i=list.begin(); i!=list.end(); i++) {
-			std::cout << "  " << (*i)->getTitle() << std::endl;
+			getStreamer() << "  " << (*i)->getTitle() << "\n";
 		}
 	}
 	const Employee *get_item(int i) {
@@ -46,11 +61,11 @@ public:
 	}
 	~EmployeeList() { 
 		std::vector<Employee*>::iterator i;
-		std::cout << "~EmployeeList, deleting " << list.size() << " employees." << std::endl;
+		getStreamer() << "~EmployeeList, deleting " << list.size() << " employees." << "\n";
 		for (i=list.begin(); i!=list.end(); i++) {
 			delete *i;
 		}
-		std::cout << "~EmployeeList empty." << std::endl;
+		getStreamer() << "~EmployeeList empty." << "\n";
 	}
 };
 

Examples/android/extend/jni/example.i

@@ -11,5 +11,8 @@
 %feature("director") Employee;
 %feature("director") Manager;
 
+/* A base class for callbacks from C++ to output text on the Java side */
+%feature("director") Streamer;
+
 %include "example.h"
 

Examples/android/extend/src/org/swig/extendexample/SwigExtend.java

@@ -8,7 +8,6 @@ import android.widget.TextView;
 import android.widget.ScrollView;
 import android.text.method.ScrollingMovementMethod;
 
-
 // CEO class, which overrides Employee::getPosition().
 class CEO extends Manager {
   public CEO(String name) {
@@ -29,6 +28,15 @@ public class SwigExtend extends Activity
     TextView outputText = null;
     ScrollView scroller = null;
 
+    /** Handles upcalls from C++ so that C++ code can display text on the TextView */
+    class TextViewStreamer extends Streamer {
+      public void display(String text) {
+        outputText.append(text);
+      }
+    }
+
+    TextViewStreamer textViewStreamer = new TextViewStreamer();
+
     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState)
@@ -41,6 +49,8 @@ public class SwigExtend extends Activity
         outputText.setMovementMethod(new ScrollingMovementMethod());
 
         scroller = (ScrollView)findViewById(R.id.Scroller);
+
+        example.setStreamer(textViewStreamer);
     }
 
     public void onRunButtonClick(View view)