Android：在 Android Place Api 中提供自动自动建议吗？

我对 Android Google 地图非常陌生，我编写了以下程序，用于在 Android 中显示自动建议，当我在“自动完成”文本框中键入文本时，它将输入到 url，但输出未显示在程序中.请看一次并让我知道我在哪里犯了错误。

   ExampleApp.java
package com.example.exampleapp;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater.Filter;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

import android.widget.Filterable;
import android.widget.Toast;

public class ExampleApp extends Activity implements OnItemClickListener{

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        AutoCompleteTextView autoCompView = (AutoCompleteTextView) findViewById(R.id.autocomplete);
        autoCompView.setAdapter(new PlacesAutoCompleteAdapter(this, R.layout.list_item));
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        String str = (String) arg0.getItemAtPosition(arg2);
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }


}
class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {
    private ArrayList<String> resultList;

    public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);
    }
    private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
    private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
    private static final String OUT_JSON = "/json";

    private static final String API_KEY = "";
    @Override
    public int getCount() {
        return resultList.size();
    }

    @Override
    public String getItem(int index) {
        return resultList.get(index);
    }

    @Override
    public android.widget.Filter getFilter() {
        Filter filter = new Filter() {
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                if (constraint != null) {
                    // Retrieve the autocomplete results.
                    resultList = autocomplete(constraint.toString());

                    // Assign the data to the FilterResults
                 //   filterResults.values = resultList;
                  //  filterResults.count = resultList.size();
                }
                return filterResults;
            }

            private ArrayList<String> autocomplete(String input) {
                ArrayList<String> resultList = null;

                HttpURLConnection conn = null;
                StringBuilder jsonResults = new StringBuilder();
                try {
                    StringBuilder sb = new StringBuilder(PLACES_API_BASE + TYPE_AUTOCOMPLETE + OUT_JSON);
                    sb.append("?sensor=false&key=" + API_KEY);
                    sb.append("&components=country:uk");
                    sb.append("&input=" + URLEncoder.encode(input, "utf8"));

                    URL url = new URL(sb.toString());
                    conn = (HttpURLConnection) url.openConnection();
                    InputStreamReader in = new InputStreamReader(conn.getInputStream());

                    // Load the results into a StringBuilder
                    int read;
                    char[] buff = new char[1024];
                    while ((read = in.read(buff)) != -1) {
                        jsonResults.append(buff, 0, read);
                    }
                } catch (MalformedURLException e) {
                   // Log.e(LOG_TAG, "Error processing Places API URL", e);
                    return resultList;
                } catch (IOException e) {
                    //Log.e(LOG_TAG, "Error connecting to Places API", e);
                    return resultList;
                } finally {
                    if (conn != null) {
                        conn.disconnect();
                    }
                }

                try {
                    // Create a JSON object hierarchy from the results
                    JSONObject jsonObj = new JSONObject(jsonResults.toString());
                    JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");

                    // Extract the Place descriptions from the results
                    resultList = new ArrayList<String>(predsJsonArray.length());
                    for (int i = 0; i < predsJsonArray.length(); i++) {
                        resultList.add(predsJsonArray.getJSONObject(i).getString("description"));
                    }
                } catch (JSONException e) {
                   // Log.e(LOG_TAG, "Cannot process JSON results", e);
                }

                return resultList;
            }
            protected void publishResults(CharSequence constraint, FilterResults results) {
                if (results != null) {
                    notifyDataSetChanged();
                }
                else {
                    notifyDataSetInvalidated();
                }
            }

            @Override
            public boolean onLoadClass(Class arg0) {
                // TODO Auto-generated method stub
                return false;
            }};
        return (android.widget.Filter) filter;
    }
}

FilterResults.java

package com.example.exampleapp;

import java.util.ArrayList;

public class FilterResults {

    protected ArrayList<String> values;
    protected int count;

}


i write the above code but the application closed .please see once and let me know where i am doing mistake in the above code ?
Thanks in Advance..........

这是我遇到类似问题时使用的代码片段。我给你一个建议，不要将整个代码放在单个 java 文件中。为您在代码中使用的每个不同任务创建单独的方法/类。它将帮助您更轻松地追踪它。

这是我的 PlacesAutoCompleteAdapter.java 文件。

package com.inukshk.adapter;

import java.util.ArrayList;

import android.content.Context;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;

import com.inukshk.CreateInukshk.CreateInukshk;

public class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements
        Filterable {
    private ArrayList<String> resultList;

    public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
        super(context, textViewResourceId);
    }

    @Override
    public int getCount() {
        return resultList.size();
    }

    @Override
    public String getItem(int index) {
        return resultList.get(index);
    }

    @Override
    public Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                if (constraint != null) {
                    // Retrieve the autocomplete results.

                    resultList = CreateInukshk.autocomplete(constraint
                            .toString());

                    // Assign the data to the FilterResults
                    filterResults.values = resultList;
                    filterResults.count = resultList.size();
                }
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint,
                    FilterResults results) {
                if (results != null && results.count > 0) {
                    notifyDataSetChanged();
                } else {
                    notifyDataSetInvalidated();
                }
            }
        };
        return filter;
    }
}

这是您必须在活动的 OnCreate() 内执行的操作。

autoCompView = (AutoCompleteTextView) findViewById(R.id.editloc);
        autoCompView.setAdapter(new PlacesAutoCompleteAdapter(this,
                R.layout.list_item));

这是我在应用程序中使用的静态字符串。

private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";
    private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
    private static final String OUT_JSON = "/json";
    private static final String API_KEY = "YOUR API KEY";

最后，这是您将在适配器中使用的方法。

public static ArrayList<String> autocomplete(String input) {

        ArrayList<String> resultList = null;

        HttpURLConnection conn = null;
        StringBuilder jsonResults = new StringBuilder();
        try {
            StringBuilder sb = new StringBuilder(PLACES_API_BASE
                    + TYPE_AUTOCOMPLETE + OUT_JSON);
            sb.append("?sensor=false&key=" + API_KEY);
            // sb.append("&components=country:uk");
            sb.append("&input=" + URLEncoder.encode(input, "utf8"));

            URL url = new URL(sb.toString());
            conn = (HttpURLConnection) url.openConnection();
            InputStreamReader in = new InputStreamReader(conn.getInputStream());

            // Load the results into a StringBuilder
            int read;
            char[] buff = new char[1024];
            while ((read = in.read(buff)) != -1) {
                jsonResults.append(buff, 0, read);
            }
        } catch (MalformedURLException e) {
            Log.e(TAG, "Error processing Places API URL", e);
            return resultList;
        } catch (IOException e) {
            Log.e(TAG, "Error connecting to Places API", e);
            return resultList;
        } finally {
            if (conn != null) {
                conn.disconnect();
            }
        }

        try {
            // Create a JSON object hierarchy from the results
            JSONObject jsonObj = new JSONObject(jsonResults.toString());
            JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");

            // Extract the Place descriptions from the results
            resultList = new ArrayList<String>(predsJsonArray.length());
            for (int i = 0; i < predsJsonArray.length(); i++) {
                resultList.add(predsJsonArray.getJSONObject(i).getString(
                        "description"));
            }

        } catch (JSONException e) {
            Log.e(TAG, "Cannot process JSON results", e);
        }

        return resultList;
    }

EDITED :

我猜您已指定 list_item.xml 如下。

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content" android:layout_height="wrap_content" />

试试看。希望它会对您有所帮助。

UPDATE :

You have to manually attach the debugger while the emulator says "Waiting for debugger to attach". In Netbean's menu bar, click "Debug", then "Attach Debugger...". You have to select your package from the "Process" drop down list, and then click "Attach". That should do it.
This works in Netbeans 7 anyway.

或者你也可以尝试下面的东西。

You have two choices: connect a debugger, or kill the process.

Looking at your logcat, you have at least two different desktop applications that are trying to connect to each application process, which is where the "Ignoring second debugger" messages are coming from.

This would happen if you were, say, running Eclipse with the ADT plugin, and the stand-alone DDMS at the same time. I don't know what you're running or what the netbeans plugin does, but I would start by figuring out if you have two different things fighting for control.

EDITED: HOW TO GET TEXT OF AutoCompleteTextView

只需编写此代码片段即可。

autoCompView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                // TODO Auto-generated method stub
                YOURTEXT = autoCompView.getText().toString();
                //new AsyncGetAutoPlace().execute(autoCompView.getText()
                //      .toString().trim());
            }
        });