我尝试了很多,现在我需要你的帮助。 我想要做的是:当黑莓应用程序启动是/否对话框弹出。 如果用户选择“是”,做一些事情,之后继续启动。 如果用户选择“否”退出程序。
我写的,如果你选择“是”之后,你应该听到声音,应振动的SSCCE。 我当然知道,该代码继续Alert.vibrate()被调用后,并没有等待vibraste完成。 无论如何,这只是一个例子。 振动()的调用应该先和dialogClosed()应该被播放的声音之前完全处理。
该SSCCE是我走到这一步。 我试过很多其他的东西。 我敢肯定,这不可能是那么难。 我只是不明白这一点。
这里是:
package TestDialog;
import net.rim.device.api.system.Alert;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.DialogClosedListener;
public class TestDialog extends UiApplication
{
public static short[] SOUND_ALERT = { 523, 200, //C for 200ms
0, 200, //Pause 200ms
554, 200, //C# 200ms
0, 200, //Pause 200ms
587, 200, //D 200ms
0, 200, //Pause 200ms
622, 200 //D# 200ms
};
/**
* @param args
*/
public static void main(final String[] args)
{
final TestDialog test = new TestDialog();
test.enterEventDispatcher();
}
public TestDialog()
{
//the dialog
final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);
d.setDialogClosedListener(new DialogClosedListener()
{
public void dialogClosed(final Dialog dialog, final int choice)
{
if (d.getSelectedValue() == Dialog.YES)
{
Alert.startVibrate(2000);
//do something which takes some time
}
else
{
System.exit(0);
}
}
});
//show the dialog
showDialog(d);
//now wait for the dialog to call notify
try
{
synchronized (this)
{
this.wait();
}
}
catch (final Exception e)
{
System.out.println(e.getMessage());
}
//finally AFTER the dialog has been closed and everything in dialogClosed() has been done, play a sound
Alert.startAudio(SOUND_ALERT, 100);
}
private void showDialog(final Dialog d)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
d.doModal();
this.notify();
}
});
}
}
OK,其他一些SSCCE。 这将启动并显示一个对话框,但随后抛出IllegalMonitorExcpetion:
package TestDialog;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
public class TestDialog extends UiApplication
{
public static short[] SOUND_ALERT = { 523, 200, //C for 200ms
0, 200, //Pause 200ms
554, 200, //C# 200ms
0, 200, //Pause 200ms
587, 200, //D 200ms
0, 200, //Pause 200ms
622, 200 //D# 200ms
};
/**
* @param args
*/
public static void main(final String[] args)
{
final TestDialog test = new TestDialog();
test.enterEventDispatcher();
}
public TestDialog()
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
//the dialog
final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);
if (d.doModal() == Dialog.YES)
{
System.out.println("selection made yes");
this.notify();
}
else
{
System.out.println("selection made no");
System.exit(0);
}
}
});
try
{
this.wait();
}
catch (final Exception e)
{
e.printStackTrace();
}
//finally AFTER the dialog has been closed and everything in dialogClosed() has been done, play a sound
System.out.println("done");
}
}
所以我把一个synchronized块周围的wait()调用,因为我读,该对象必须调用wait()时进行同步。 但是,现在的应用程序显示什么。 它运行的主方法,但什么地方停止。 在模拟器很奇怪的事情发生了:当模拟器仍处于启动和“调试器附着”在显示屏上写的,应用程序的主方法被调用。 嗯,这里是用synchronized块SSCCE。 仍然无法正常工作。
package TestDialog;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
public class TestDialog extends UiApplication
{
public static short[] SOUND_ALERT = { 523, 200, //C for 200ms
0, 200, //Pause 200ms
554, 200, //C# 200ms
0, 200, //Pause 200ms
587, 200, //D 200ms
0, 200, //Pause 200ms
622, 200 //D# 200ms
};
/**
* @param args
*/
public static void main(final String[] args)
{
final TestDialog test = new TestDialog();
test.enterEventDispatcher();
}
public TestDialog()
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
//the dialog
final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);
if (d.doModal() == Dialog.YES)
{
System.out.println("selection made yes");
this.notify();
}
else
{
System.out.println("selection made no");
System.exit(0);
}
}
});
synchronized (this)
{
try
{
this.wait();
}
catch (final Exception e)
{
e.printStackTrace();
}
}
//finally AFTER the dialog has been closed and everything in dialogClosed() has been done, play a sound
System.out.println("done");
}
}
最后我想利用的忙等待。 仍然没有成功。 对话只是不弹出。 即使在主线程中while循环Thread.sleep代码(1000)UI线程似乎不起作用。 这里是繁忙等待的SSCCE:
package TestDialog;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
public class TestDialog extends UiApplication
{
/**
* @param args
*/
public static void main(final String[] args)
{
final TestDialog test = new TestDialog();
test.enterEventDispatcher();
}
private volatile boolean _blocked = true;
public TestDialog()
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
//the dialog
final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);
if (d.doModal() == Dialog.YES)
{
System.out.println("selection made yes");
_blocked = false;
}
else
{
System.out.println("selection made no");
System.exit(0);
}
}
});
while (_blocked)
{
try
{
Thread.sleep(1000);
}
catch (final Exception e)
{
//safety catch
}
}
finish();
}
private void finish()
{
System.out.println("done");
}
}
谢谢你的帮助。
Haferblues