问JSONArray，JsonObjectRequest和Google

EN

{"error_message":"This API project is not authorized to use this API. Please ensure this API is activated in the Google Developers Console: https:\/\/console.developers.google.com\/apis\/api\/places_backend?project=_","predictions":[],"status":"REQUEST_DENIED"}

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.TextView;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;

/**
 * The Looking-for-a-deliver activity
 */
public class LookingForActivity extends AppCompatActivity {
    String url;
    private static final String TAG_RESULT = "predictions";
    JSONObject json;

    AutoCompleteTextView auto_tv;
    ArrayList<String> names;
    ArrayAdapter<String> adapter;
    String browserKey = "AIzaSyBeUg81xPA5e8XUqjoAHcoEPLe3bpYSprg";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_looking_for);
        auto_tv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
        auto_tv.setThreshold(0);

        names = new ArrayList<String>();

        auto_tv.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {

            }

            public void beforeTextChanged(CharSequence s, int start, int count,
                                          int after) {

            }

            public void onTextChanged(CharSequence s, int start, int before,
                                      int count) {

                if (s.toString().length() <= 3) {
                    names = new ArrayList<String>();
                    updateList(s.toString());
                }

            }
        });

    }

    public void updateList(String place) {
        String input = "";

        try {
            input = "input=" + URLEncoder.encode(place, "utf-8");
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        }

        String output = "json";
        String parameter = input + "&types=geocode&sensor=true&key="
                + browserKey;

        url = "https://maps.googleapis.com/maps/api/place/autocomplete/"
                + output + "?" + parameter;

        JsonObjectRequest jsonObjReq = new JsonObjectRequest(Method.GET, url,
                null, new Response.Listener<JSONObject>() {

            @Override
            public void onResponse(JSONObject response) {

                try {

                    JSONArray ja = response.getJSONArray(TAG_RESULT);

                    for (int i = 0; i < ja.length(); i++) {
                        //--???----
                        JSONObject c = ja.getJSONObject(i);
                        String description = c.getString("description");
                        Log.d("description", description);
                        names.add(description);
                    }

                    adapter = new ArrayAdapter<String>(
                            getApplicationContext(),
                            android.R.layout.simple_list_item_1, names) {
                        @Override
                        public View getView(int position,
                                            View convertView, ViewGroup parent) {
                            View view = super.getView(position,
                                    convertView, parent);
                            TextView text = (TextView) view
                                    .findViewById(android.R.id.text1);
                            text.setTextColor(Color.BLACK);
                            return view;
                        }
                    };
                    auto_tv.setAdapter(adapter);
                    adapter.notifyDataSetChanged();
                } catch (Exception e) {
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
            }
        });
        MyApplication.getInstance().addToReqQueue(jsonObjReq, "jreq");
    }

}

import android.app.Application;
import android.text.TextUtils;
import android.util.Log;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;



public class MyApplication extends Application{
    private RequestQueue mRequestQueue;
    private static MyApplication mInstance;
    public static final String TAG = MyApplication.class
            .getSimpleName();
    @Override
    public void onCreate() {
        super.onCreate();
        mInstance = this;
    }
    public static synchronized MyApplication getInstance() {
        return mInstance;
    }
    public RequestQueue getReqQueue() {
        if (mRequestQueue == null) {
            mRequestQueue = Volley.newRequestQueue(getApplicationContext());
        }

        return mRequestQueue;
    }
    public <T> void addToReqQueue(Request<T> req, String tag) {
        req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
        getReqQueue().add(req);
    }
    public <T> void addToReqQueue(Request<T> req) {
        req.setTag(TAG);
        getReqQueue().add(req);
    }
    public void cancelPendingReq(Object tag) {
        if (mRequestQueue != null) {
            mRequestQueue.cancelAll(tag);
        }
    }
}