我有一个自定义的 Listview，每个项目上都有一个图像按钮，它应该给我指向建筑物的方向。当按下 DirectionsButtons 时，谷歌地图打开，但坐标填写错误。
到目的地，它只给了我一个逗号。有人可以帮我找出我做错了什么吗？
public class buildingList extends Activity {
String myLat = "";
String myLng = "";
private List<buildingObject> buildingItem = new ArrayList<buildingObject>();
ViewHolder holder = new ViewHolder();
ListView list;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getLocations();
setContentView(R.layout.building_list);
new GetbuildingsTask().execute(myLat, myLng);
}
private void populateListview() {
ArrayAdapter<buildingObject> adapter = new MyListAdapter();
list = (ListView) findViewById(R.id.buildingList);
list.setAdapter(adapter);
}
private class MyListAdapter extends ArrayAdapter<buildingObject> {
public MyListAdapter() {
super(buildingList.this, R.layout.building_row, buildingItem);
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
//Null possible, so checking
View itemView = convertView;
if (itemView == null) {
itemView = getLayoutInflater().inflate(R.layout.building_row, parent, false);
}
// Find the item to work with
buildingObject currentItem = buildingItem.get(position);
// Filling the View
holder.thumbnail = (ImageButton) itemView.findViewById(R.id.btnbuildingListThumbnail);
holder.thumbnail.setBackgroundResource(currentItem.getThumbnail());
holder.name = (TextView) itemView.findViewById(R.id.lblbuildingListItemName);
holder.name.setText(currentItem.getName());
holder.btnDirections = (ImageButton) itemView.findViewById(R.id.btnbuildingListDirections);
holder.thumbnail = (ImageButton) itemView.findViewById(R.id.btnbuildingListThumbnail);
holder.btnShare = (ImageButton) itemView.findViewById(R.id.btnbuildingListShare);
holder.btnDirections.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
TextView txtLat = (TextView) parent.getChildAt(position - list.getFirstVisiblePosition()).findViewById(R.id.lblbuildingListlatitude);
TextView txtLng = (TextView) parent.getChildAt(position - list.getFirstVisiblePosition()).findViewById(R.id.lblbuildingListlongitude);
String lat = txtLat.getText().toString();
String lng = txtLng.getText().toString();
Log.v("Lat ", "Lat of selected building is " + lat);
Log.v("Lng ", "Lng of selected building is " + lng);
Uri uri = Uri.parse("http://maps.google.com/maps?&saddr=" + myLat + "," + myLng + "&daddr=" + lat + "," + lng);
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
});
holder.thumbnail.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
String btnmsg = "ThumbNail";
Toast.makeText(buildingList.this, btnmsg, Toast.LENGTH_LONG).show();
}
});
holder.btnShare.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String btnmsg = "Share";
Toast.makeText(buildingList.this, btnmsg, Toast.LENGTH_LONG).show();
}
});
return itemView;
}
}
static class ViewHolder {
ImageButton thumbnail;
TextView name;
ImageButton btnDirections;
ImageButton btnShare;
}
private void getLocations() {
String[] locations = getApplicationContext().fileList();
FileInputStream fis;
for (int i = 0; i < locations.length; i++) {
if (locations[i].equals("my_latitude")) {
try {
fis = openFileInput(locations[i]);
byte[] input = new byte[fis.available()];
while (fis.read(input) != -1) {
myLat += new String(input);
}
fis.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (locations[i].equals("my_longitude")) {
try {
fis = openFileInput(locations[i]);
byte[] input = new byte[fis.available()];
while (fis.read(input) != -1) {
myLng += new String(input);
}
fis.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
class GetbuildingsTask extends AsyncTask<String, Void, JSONArray> {
@Override
protected JSONArray doInBackground(String... data) {
String lat = data[0];
String lng = data[1];
JSONParser jParser = new JSONParser();
JSONArray json = jParser
.getJSONFromUrl("http://www.mysite.eu/index.php/building/searchbuildingsJSON?lat=" + lat + "&lng=" + lng + "&radius=10");
return json;
}
protected void onPostExecute(JSONArray result) {
if (result != null) {
try {
Log.v(result.getString(0), result.getString(0));
} catch (JSONException e) {
e.printStackTrace();
}
Toast toast = Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_SHORT);
toast.show();
Log.d("whut", "" + result.length());
String[] buildings = new String[result.length()];
buildingObject[] building = new buildingObject[result.length()];
try {
for (int i = 0; i < result.length(); i++) {
JSONObject row;
row = result.getJSONObject(i);
buildings[i] = row.getString("Name");
buildings[i] += "" + row.getDouble("Latitude");
buildings[i] += "" + row.getDouble("Longitude");
buildings[i] += ". Distance: " + row.getDouble("distance") + "km";
String Name = row.getString("Name");
float lat = (float) row.getDouble("Latitude");
float lng = (float) row.getDouble("Longitude");
float dist = (float) row.getDouble("distance");
//building[i] = new buildingObject(Name, lat, lng, dist);
buildingItem.add(new buildingObject(Name,lat, lng, dist));
}
} catch (JSONException e) {
Log.v("Noooooooooooo", "You were the chosen one");
Log.e("Noooooooooooo", "Dis iz die erreur: " + e.toString());
}
populateListview();
} else {
Toast toast = Toast.makeText(getApplicationContext(),
"Please enable internet", Toast.LENGTH_LONG);
toast.show();
}
}
}
}
最佳答案
您的代码看起来不错。
您是否将调试点设置为:
Uri uri = Uri.parse("http://maps.google.com/maps?&saddr=" + myLat + "," + myLng + "&daddr=" + lat + "," + lng)
我的猜测是 myLat 和 myLng 是空的，因此只留下一个“,”(逗号)。
如果它实际上是空的或 null，那么我要放置调试点的下一个位置是(或之前):
myLat += new String(input);
和
myLng += new String(input);
这是被击中了吗？是否抛出异常？
编辑
附近:
// Filling the View
您在哪里填充 lblbuildingLiSTLatitude 和长 TextView ？
关于android - 按 ListViewItem 时谷歌地图的错误协调，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17014483/