尝试中没有任何反应

Question

在这个活动中，我找到附近的地方并将它们添加到列表视图中。我还想像其他数据一样在 arrayList 中添加地点的电话号码，所以我不得不使用地点详细信息请求。因此，我从 arrayList 中获取所有地点的所有 place_id 并启动查询以获取详细信息（电话号码）。问题出在“readFromGooglePlaceDetailsAPI”类中，它进入“try”然后什么也没发生，我不知道为什么！！！我只能看到“IN TRY !!!”然后是 println 中的“----”。

我的顺序不对吗？

问题出在哪里，解决办法是什么？

public class ListActivity extends Activity implements OnItemClickListener {

 public ArrayList<GetterSetter> myArrayList;
 ArrayList<GetterSetter> detailsArrayList;
    ListView myList;
    ProgressDialog dialog;
    TextView nodata;
    CustomAdapter adapter;
    GetterSetter addValues;
    GetterSetter addDetails;
    private LocationManager locMan;


@Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.list_view_activity);

    if (!isNetworkAvailable()) {
    Toast.makeText(getApplicationContext(), "Enable internet connection and RE-LAUNCH!!",
    Toast.LENGTH_LONG).show();
    return;
    }

    myList = (ListView) findViewById(R.id.placesList);

    placeSearch();


}

    private boolean isNetworkAvailable() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    return activeNetworkInfo != null;
    }

 public void placeSearch() {

//get location manager
locMan = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
//get last location
Location lastLoc = locMan.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
double lat = lastLoc.getLatitude();
double lng = lastLoc.getLongitude();

    dialog = ProgressDialog.show(this, "", "Please wait", true);

//build places query string
String placesSearchStr;

placesSearchStr = "https://maps.googleapis.com/maps/api/place/nearbysearch/" +
        "json?location="+lat+","+lng+
        "&radius=1000&sensor=true" +
        "&types="+ ServicesListActivity.types+
        "&key=My_KEY";

//execute query
new readFromGooglePlaceAPI().execute(placesSearchStr);

myList.setOnItemClickListener(this);

    }

public void detailsSearch() {
    String detailsSearchStr;

    //build places query string
    for(int i=0; i < myArrayList.size(); i++){

    detailsSearchStr = "https://maps.googleapis.com/maps/api/place/details/json?" +
            "placeid=" + myArrayList.get(i).getPlace_id() +
            "&key=My_KEY";

        Log.d("PlaceID:", myArrayList.get(i).getPlace_id());

    //execute query
        new readFromGooglePlaceDetailsAPI().execute(detailsSearchStr);

    }

}

public class readFromGooglePlaceDetailsAPI extends AsyncTask<String, Void, String> {

    @Override protected String doInBackground(String... param) {
        return readJSON(param[0]);
    }

    protected void onPostExecute(String str) {

        detailsArrayList = new ArrayList<GetterSetter>();

        String phoneNumber =" -NA-";
        try {
            System.out.println("IN TRY !!!");

            JSONObject root = new JSONObject(str);
            JSONArray results = root.getJSONArray("result");
            System.out.println("Before FOR !!!");

            for (int i = 0; i < results.length(); i++) {

                System.out.println("IN FOR LOOP !!!");

                addDetails = new GetterSetter();

                JSONObject arrayItems = results.getJSONObject(i);

                if(!arrayItems.isNull("formatted_phone_number")){
                    phoneNumber = arrayItems.getString("formatted_phone_number");

                    Log.d("Phone Number  ", phoneNumber);
                }

                addDetails.setPhoneNumber(phoneNumber);
                System.out.println("ADDED !!!");

                detailsArrayList.add(addDetails);

                Log.d("Before", detailsArrayList.toString());

            }
        } catch (Exception e) {

        }
        System.out
                .println("------------------------------------------------------------------");
        Log.d("After:", detailsArrayList.toString());
       // nodata = (TextView) findViewById(R.id.nodata);
        //nodata.setVisibility(View.GONE);
       // adapter = new CustomAdapter(ListActivity.this, R.layout.list_row, detailsArrayList);
       // myList.setAdapter(adapter);
        //adapter.notifyDataSetChanged();
       // dialog.dismiss();


    }

}


public class readFromGooglePlaceAPI extends AsyncTask<String, Void, String> {

  @Override protected String doInBackground(String... param) {
    return readJSON(param[0]);
}

protected void onPostExecute(String str) {
    myArrayList = new ArrayList<GetterSetter>();

    String rating=" -NA-";
    try {

        JSONObject root = new JSONObject(str);
        JSONArray results = root.getJSONArray("results");
        for (int i = 0; i < results.length(); i++) {


            addValues = new GetterSetter();

            JSONObject arrayItems = results.getJSONObject(i);
            JSONObject geometry = arrayItems.getJSONObject("geometry");
            JSONObject location = geometry.getJSONObject("location");
           //place ID for place details later
            String placeID = arrayItems.getString("place_id").toString();

            if(!arrayItems.isNull("rating")){
                rating = arrayItems.getString("rating");
            }
            addValues.setPlace_id(placeID);
            addValues.setLat(location.getString("lat"));
            addValues.setLon(location.getString("lng"));
            addValues.setName(arrayItems.getString("name").toString());
            addValues.setRating(rating);
            addValues.setVicinity(arrayItems.getString("vicinity").toString());

            myArrayList.add(addValues);

            //Log.d("Before", myArrayList.toString());


        }
    } catch (Exception e) {

    }
  //  System.out
   //         .println("############################################################################");
  //  Log.d("After:", myArrayList.toString());
    nodata = (TextView) findViewById(R.id.nodata);
    nodata.setVisibility(View.GONE);
    adapter = new CustomAdapter(ListActivity.this, R.layout.list_row, myArrayList);
    myList.setAdapter(adapter);
    //adapter.notifyDataSetChanged();
    dialog.dismiss();

      detailsSearch();
}

}

public String readJSON(String URL) {
    StringBuilder sb = new StringBuilder();
    HttpGet httpGet = new HttpGet(URL);
    HttpClient client = new DefaultHttpClient();

    try {
        HttpResponse response = client.execute(httpGet);
        StatusLine statusLine = response.getStatusLine();
        if (statusLine.getStatusCode() == 200) {
            HttpEntity entity = response.getEntity();
            InputStream content = entity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(content));
            String line;

            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } else {
            Log.e("JSON", "Couldn't find JSON file");
        }
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return sb.toString();
}

@Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    Intent details = new Intent(ListActivity.this, Details.class);
    details.putExtra("name", myArrayList.get(arg2).getName());
    details.putExtra("rating", myArrayList.get(arg2).getRating());
    details.putExtra("vicinity", myArrayList.get(arg2).getVicinity());
    details.putExtra("lat", myArrayList.get(arg2).getLat());
    details.putExtra("lon", myArrayList.get(arg2).getLon());
    details.putExtra("formatted_phone_number", detailsArrayList.get(arg2).getPhoneNumber());

    startActivity(details);
}

 }

Answer 1

try{
    JSONObject jsonObject = new JSONObject(str);
    if (jsonObject.has("results")) {
        JSONArray jsonArray = jsonObject.getJSONArray("results");
        for (int i = 0; i < jsonArray.length(); i++) {
        //your logic here
        }
    }
} catch (JSONException e) {
    e.printStackTrace();
}

Answer 2

请注意，如果映射失败，getJSONArray() 函数会抛出异常。例如，我找不到名为 results 的 JSON 数组。

你首先要做的最重要的事情是：

改变：

catch (Exception e) {

}

到

catch (Exception e) {
    Log.e(YOUR_TAG, "Exception ..." , e);
}

您的尝试会引发一个您甚至没有记录的异常。这可能是你感到困惑的原因。