Question

我试图在谷歌地图活动的底部显示列表视图（仅在点击按钮时），但它不起作用，只显示应用停止消息。如何在Google地图活动中显示listview？

这是我的java和xml代码

package com.example.dong_gyo.project;

import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import java.util.ArrayList;

public class MapFind extends ActionBarActivity {

    GoogleMap mMap; // Might be null if Google Play services APK is not available.
    LocationManager lm;
    String locationProvider;
    Location location;
    Button mapListbut;
    ListView mapList;
    ArrayList list;
    ButtonListener listener;
    ArrayAdapter mapadapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.map_find);
        setUpMapIfNeeded();
        mapListbut = (Button)findViewById(R.id.showMapList);

        mapadapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, list);

        mapList = (ListView)findViewById(R.id.mapList);
        mapList.setAdapter(mapadapter);
        mapList.setVisibility(View.INVISIBLE);
        mapListbut.setOnClickListener(listener);
    }

    @Override
    protected void onResume() {
        super.onResume();
        setUpMapIfNeeded();
    }

    private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
        if (mMap == null) {
             // Try to obtain the map from the SupportMapFragment.
            mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();

            lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

            locationProvider = lm.getBestProvider(new Criteria(), true);

            location = lm.getLastKnownLocation(locationProvider);

            double latitude = location.getLatitude();
            double longitude = location.getLongitude();

            final LatLng LOC = new LatLng(latitude, longitude);

            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(LOC, 16));

            // Check if we were successful in obtaining the map.
            if (mMap != null) {
                setUpMap(LOC);
            }
        }   
    }


    private void setUpMap(LatLng LOC) {
        mMap.addMarker(new MarkerOptions().position(LOC));
    }


    class ButtonListener implements View.OnClickListener {

        @Override
        public void onClick(View v) { // 목록 토글 버튼 리스너
            // TODO Auto-generated method stub

            switch (v.getId()) { //
                case R.id.showMapList:
                    if (!mapList.isShown()) {
                        mapList.setVisibility(View.VISIBLE);
                        mapadapter.notifyDataSetChanged();
                        mapListbut.setSelected(true);
                    } else {
                        mapList.setVisibility(View.INVISIBLE);
                        mapListbut.setSelected(false);
                    }
                    break;
            }
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu items for use in the action bar
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.main_activity_actions, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle presses on the action bar items
        switch (item.getItemId()) {
            case R.id.action_search:
                startActivity(new Intent(SearchManager.INTENT_ACTION_GLOBAL_SEARCH));
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

}

XML：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1">

    <fragment xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/map"
        tools:context=".MapsActivity"
        android:name="com.google.android.gms.maps.SupportMapFragment"/>

    <Button
        android:id="@+id/showMapList"
        android:text = "목록보기"
        android:layout_width="100dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="20dp"
        android:layout_marginLeft="20dp"/>


    <ListView
        android:id="@+id/mapList"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:background="#eeeeee"  >
    </ListView>

</RelativeLayout>

Answer 1

我运行了你的代码，它说它得到一个空指针。查看代码，location = lm.getLastKnownLocation(locationProvider);使location为空。因此，请尝试：

，而不是getBestProvider

location = lm.getLastKnownLocation(LocationManager.PASSIVE_PROVIDER);

我试过了，地图加载了。

在googlemaps活动上显示Listview

1 个答案: