Question

我是Android的新手，但我已经设法按照一些教程开始让我开始..我想做的是，一旦用户在屏幕上触摸了更多，就会出现一个带有三个按钮的警报对话框比2（秒）我遇到的问题是当我启动它时ALERTDIALOG Box没有出现在地图上..我没有得到任何错误？有人可以帮助我。

以下是我的代码......

    long start;
    long stop;

    //reference map from citymap.xml file
    map = (MapView) findViewById(R.id.mvMain);

    // Enable zoom features 
    map.setBuiltInZoomControls(false);

    //Declaring the instance Interaction 
    Interact t = new Interact();

    //declaring a list of overlays
    List<Overlay> overlayList = map.getOverlays();

    // interact t in to overlay list.
    overlayList.add(t);

    class Interact extends Overlay {    
        public boolean OnTouchEvent(MotionEvent e, MapView m){
        // initiating motion event action down
        if(e.getAction() == MotionEvent.ACTION_DOWN){
        // set start time
            start = e.getEventTime();

        }
        // Initiating motion event action up: when the user stops on touch event
        if(e.getAction() == MotionEvent.ACTION_UP){
            // set end time 
            stop = e.getEventTime();
        }
        // calculating the time to project an alert dialog 
        if (stop > 1500){
            Toast.makeText(CityMap.this, "toast meee", 50000).show();
            //perform an action, create alert dialog box
            AlertDialog.Builder builder = new AlertDialog.Builder(CityMap.this).create();
            builder.setTitle("Select an Option");
            builder.setCancelable(true);
            builder.setPositiveButton("Place pint Point", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog, int which) {
                    // TODO Auto-generated method stub

                }
            });
builder.create();
            builder.show();
            return true;
        }
        return true;

Answer 1

我认为你搞砸了最后一句if语句。尝试第二次返回false。

查看我的：

if (stop - start > 1500) {
            // perform some action
            AlertDialog alert = new AlertDialog.Builder(Main.this).create();
            alert.setTitle("Pick an option");
            alert.setMessage("Pick an option dude!");

            alert.setButton("Place a pin",
                    new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog,
                                int which) {
                            // TODO Auto-generated method stub

                        }
                    });

希望这会有所帮助;）

Answer 2

对于@Pepys：不推荐使用此方法。你应该使用

alert.setPositiveButton("your text", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {...
}});

AlertDialog不会出现在GoogleMap上。恐慌

2 个答案: