129 lines
4.8 KiB
Java
129 lines
4.8 KiB
Java
package org.swig.extendexample;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.Button;
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import android.widget.TextView;
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import android.widget.ScrollView;
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import android.text.method.ScrollingMovementMethod;
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// CEO class, which overrides Employee::getPosition().
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class CEO extends Manager {
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public CEO(String name) {
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super(name);
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}
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public String getPosition() {
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return "CEO";
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}
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// Public method to stop the SWIG proxy base class from thinking it owns the underlying C++ memory.
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public void disownMemory() {
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swigCMemOwn = false;
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}
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}
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public class SwigExtend extends Activity
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{
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TextView outputText = null;
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ScrollView scroller = null;
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/** Handles upcalls from C++ so that C++ code can display text on the TextView */
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class TextViewStreamer extends Streamer {
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public void display(String text) {
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outputText.append(text);
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}
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}
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TextViewStreamer textViewStreamer = new TextViewStreamer();
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/** Called when the activity is first created. */
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@Override
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public void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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outputText = (TextView)findViewById(R.id.OutputText);
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outputText.setText("Press 'Run' to start...\n");
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outputText.setMovementMethod(new ScrollingMovementMethod());
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scroller = (ScrollView)findViewById(R.id.Scroller);
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example.setStreamer(textViewStreamer);
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}
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public void onRunButtonClick(View view)
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{
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outputText.append("Started...\n");
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nativeCall();
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outputText.append("Finished!\n");
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// Ensure scroll to end of text
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scroller.post(new Runnable() {
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public void run() {
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scroller.fullScroll(ScrollView.FOCUS_DOWN);
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}
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});
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}
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/** Calls into C/C++ code */
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public void nativeCall()
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{
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// Create an instance of CEO, a class derived from the Java proxy of the
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// underlying C++ class. The calls to getName() and getPosition() are standard,
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// the call to getTitle() uses the director wrappers to call CEO.getPosition().
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CEO e = new CEO("Alice");
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outputText.append( e.getName() + " is a " + e.getPosition() + "\n");
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outputText.append( "Just call her \"" + e.getTitle() + "\"\n" );
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outputText.append( "----------------------\n" );
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// Create a new EmployeeList instance. This class does not have a C++
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// director wrapper, but can be used freely with other classes that do.
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EmployeeList list = new EmployeeList();
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// EmployeeList owns its items, so we must surrender ownership of objects we add.
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e.disownMemory();
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list.addEmployee(e);
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outputText.append( "----------------------\n" );
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// Now we access the first four items in list (three are C++ objects that
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// EmployeeList's constructor adds, the last is our CEO). The virtual
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// methods of all these instances are treated the same. For items 0, 1, and
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// 2, all methods resolve in C++. For item 3, our CEO, getTitle calls
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// getPosition which resolves in Java. The call to getPosition is
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// slightly different, however, because of the overridden getPosition() call, since
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// now the object reference has been "laundered" by passing through
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// EmployeeList as an Employee*. Previously, Java resolved the call
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// immediately in CEO, but now Java thinks the object is an instance of
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// class Employee. So the call passes through the
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// Employee proxy class and on to the C wrappers and C++ director,
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// eventually ending up back at the Java CEO implementation of getPosition().
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// The call to getTitle() for item 3 runs the C++ Employee::getTitle()
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// method, which in turn calls getPosition(). This virtual method call
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// passes down through the C++ director class to the Java implementation
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// in CEO. All this routing takes place transparently.
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outputText.append( "(position, title) for items 0-3:\n" );
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outputText.append( " " + list.get_item(0).getPosition() + ", \"" + list.get_item(0).getTitle() + "\"\n" );
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outputText.append( " " + list.get_item(1).getPosition() + ", \"" + list.get_item(1).getTitle() + "\"\n" );
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outputText.append( " " + list.get_item(2).getPosition() + ", \"" + list.get_item(2).getTitle() + "\"\n" );
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outputText.append( " " + list.get_item(3).getPosition() + ", \"" + list.get_item(3).getTitle() + "\"\n" );
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outputText.append( "----------------------\n" );
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// Time to delete the EmployeeList, which will delete all the Employee*
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// items it contains. The last item is our CEO, which gets destroyed as well.
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list.delete();
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outputText.append( "----------------------\n" );
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}
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/** static constructor */
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static {
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System.loadLibrary("example");
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}
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}
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