如何设置闹钟或提醒谷歌地图上的android

Question

我正试图实现基于GPS的警报，如果我在x市，当我到达特定的精确位置时，我在那个地方放置一个pin点，它应该给我一个警报或警报。我已经实现了一个完整的地图结构，我也已经编程显示我的当前位置和放置一个精确位置。我不知道如何附上源代码，请以这种方式帮助我，我真的是新的android，我不知道如何做到这一点。这是代码，请告诉我哪里出错了。

public void onLocationChanged(Location l) 
{
 // TODO Auto-generated method stub
 lat=(int) (l.getLatitude() *1E6) ;
 longi=(int) (l.getLongitude() *1E6);
 ourLocation= new GeoPoint(lat,longi);
 OverlayItem overlayItem= new OverlayItem(ourLocation,"","");   
 CustomPinpoint custom=new CustomPinpoint(d,Main.this);
 custom.insertPinPoint(overlayItem);
 overlayList.add(custom);
 controller.setCenter(ourLocation); 
     geocoder= new Geocoder(getBaseContext(), Locale.getDefault());
    try
    {       
    List<Address>address1=geocoder.getFromLocation
    (ourLocation.getLatitudeE6()/1E6,ourLocation  .getLongitudeE6()/1E6, 1);
   if(address1.size()>0 )
    {
   for(int i=0; i<address1.get(0).getMaxAddressLineIndex();i++)
   {                
       display1 += address1.get(0).getAddressLine(i)+"n";
    }
    }
}
catch(IOException e1)
{
    e1.printStackTrace();
    Toast.makeText(getBaseContext(), "error", Toast.LENGTH_LONG).show();
}
if(display1.equals(display))
{   
    AlertDialog alert= new AlertDialog.Builder(Main.this).create();
    alert.setTitle("Destination");
    alert.setMessage("You Reached to  destination");
    alert.setButton("OK",new DialogInterface.OnClickListener() 
{

     public void onClick(DialogInterface arg0, int arg1) 
     {
         // TODO Auto-generated method stub
      }
       });
    alert.show();   
      }
    }

Answer 1

上面的代码不足以显示警告对话框。要在代码中应用警告，必须包含这样的代码形式;

/**
     * Function to show settings alert dialog On pressing Settings button will
     * lauch Settings Options
     * */
    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        // Setting Dialog Title
        alertDialog.setTitle("GPS is settings");
        // Setting Dialog Message
        alertDialog
                .setMessage("GPS is not enabled. Do you want to go to settings menu?");
        // On pressing Settings button
        alertDialog.setPositiveButton("Settings",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent intent = new Intent(
                                Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                        mContext.startActivity(intent);
                    }
                });
        // on pressing cancel button
        alertDialog.setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
        // Showing Alert Message
        alertDialog.show();
    }

你必须在你的项目的src/目录下创建一个单独的java代码(类);

下面的类名是"AlertDialogManager.java"

public class AlertDialogManager {
    /**
     * Function to display simple Alert Dialog
     * @param context - application context
     * @param title - alert dialog title
     * @param message - alert message
     * @param status - success/failure (used to set icon)
     *               - pass null if you don't want icon
     * */
    public void showAlertDialog(Context context, String title, String message,
            Boolean status) {
        AlertDialog alertDialog = new AlertDialog.Builder(context).create();
        // Setting Dialog Title
        alertDialog.setTitle(title);
        // Setting Dialog Message
        alertDialog.setMessage(message);
        if(status != null)
            // Setting alert dialog icon
            alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);
        // Setting OK Button
        alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        // Showing Alert Message
        alertDialog.show();
    }
}