/**
	 * 监听GPS
	 */
	private void initGPS() {
		LocationManager locationManager = (LocationManager) this
				.getSystemService(Context.LOCATION_SERVICE);
		// 判断GPS模块是否开启，如果没有则开启
		if (!locationManager
				.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) {
			Toast.makeText(TrainDetailsActivity.this, "请打开GPS",
					Toast.LENGTH_SHORT).show();
			AlertDialog.Builder dialog = new AlertDialog.Builder(this);
			dialog.setMessage("请打开GPS");
			dialog.setPositiveButton("确定",
					new android.content.DialogInterface.OnClickListener() {

						@Override
						public void onClick(DialogInterface arg0, int arg1) {

							// 转到手机设置界面，用户设置GPS
							Intent intent = new Intent(
									Settings.ACTION_LOCATION_SOURCE_SETTINGS);
							startActivityForResult(intent, 0); // 设置完成后返回到原来的界面

						}
					});
			dialog.setNeutralButton("取消", new android.content.DialogInterface.OnClickListener() {
				
				@Override
				public void onClick(DialogInterface arg0, int arg1) {
					arg0.dismiss();
				}
			} );
			dialog.show();
		} else {
			// 弹出Toast
//			Toast.makeText(TrainDetailsActivity.this, "GPS is ready",
//					Toast.LENGTH_LONG).show();
//			// 弹出对话框
//			new AlertDialog.Builder(this).setMessage("GPS is ready")
//					.setPositiveButton("OK", null).show();
		}
	}