如何在从 ListView 项获取的两个地理点之间绘制标记和路线？

Posted 2023-03-16

【中文标题】如何在从 ListView 项获取的两个地理点之间绘制标记和路线？

【英文标题】：How to draw Marker and route between two geo points taken from ListView item?

【发布时间】：2015-05-13 10:29:27

【问题描述】：

我有任务。我必须在一项活动中在ListView 上显示来自特定手机号码的消息。这些消息包含两个位置的纬度和经度。当我单击任何列表项时，它应该在这两个位置上绘制标记，并且必须在另一个活动中在它们之间绘制路线。 我的消息格式是!+11.3326,+077.7193,08:41!+11.3326,+077.7194,08:41#

我的 MainActivity.java 是

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final ListView listView = (ListView) findViewById(R.id.listView);
    List<String> msgList=getSMS();
    ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,msgList);
    listView.setAdapter(adapter);
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
            String str=(String)parent.getItemAtPosition(position);
            String lat1=str.substring(2,8);
            String lng1=str.substring(11,18);
            String lat2=str.substring(27,33);
            String lng2=str.substring(36,43);
            Toast.makeText(getApplicationContext(),lat1+""+lng1+""+lat2+""+lng2,Toast.LENGTH_SHORT).show();
            Intent intent=new Intent(MainActivity.this,MapsActivity.class);
            startActivity(intent);
        
    );


public List<String> getSMS()
    List<String>sms=new ArrayList<String>();
    final String SMS_URI_INBOX="content://sms/inbox";
    try 
        Uri uri=Uri.parse(SMS_URI_INBOX);
        String[] projection=new String[]"_id","address","person","body","date","type";
        Cursor cursor=getContentResolver().query(uri,projection,"address='[phone]'",null,null);
        if (cursor.moveToFirst())
            int index_Address = cursor.getColumnIndex("address");
            int index_Person = cursor.getColumnIndex("person");
            int index_Body = cursor.getColumnIndex("body");
            int index_Date = cursor.getColumnIndex("date");
            int index_Type = cursor.getColumnIndex("type");
            do 
                String strAddress = cursor.getString(index_Address);
                int intPerson = cursor.getInt(index_Person);
                String strBody = cursor.getString(index_Body);
                String longDate = cursor.getString(index_Date);
                int intType = cursor.getInt(index_Type);

                sms.add("\n"+strBody+"\n");
            while (cursor.moveToNext());
            if (!cursor.isClosed())
                cursor.close();
                cursor=null;
            
        
    catch (SQLiteException e)
        Log.d("SQLiteException",e.getMessage());
    
    return sms;

我的 MapsActivity.java 是 公共类 MapsActivity 扩展 FragmentActivity

GoogleMap mMap; // Might be null if Google Play services APK is not available.

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    setUpMapIfNeeded();
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    mMap.getUiSettings().setZoomControlsEnabled(true);
    mMap.getUiSettings().setZoomGesturesEnabled(true);
    mMap.getUiSettings().setMyLocationButtonEnabled(true);
    addMarker();



private void addMarker() 
    final LatLng latLng=new LatLng(lat1,lng1);
    mMap.addMarker(new MarkerOptions().position(latLng).title("My Marker"));

我已经显示了这些消息，并且可以从ListView 项目中获取输入。我不知道如何将那些lat1、lng1、lat2、lng2 值传递给MapsActivity 并添加标记。请有任何解决方案。

【参考方案1】：

当您启动地图活动时，请在您的意图中传递 latlng 值。

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() 
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
        String str=(String)parent.getItemAtPosition(position);
        Intent intent=new Intent(MainActivity.this,MapsActivity.class);
        intent.putExtra("locationValues",str);
        startActivity(intent);
    
);

现在在您创建地图的活动中取回这些值。

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    setUpMapIfNeeded();
    mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    mMap.getUiSettings().setZoomControlsEnabled(true);
    mMap.getUiSettings().setZoomGesturesEnabled(true);
    mMap.getUiSettings().setMyLocationButtonEnabled(true);
    String locationString = this.getIntent().getStringExtra("locationValues","");
    if(!TextUtils.isEmpty(locationString))
    
        String lat1=str.substring(2,8);
        String lng1=str.substring(11,18);
        String lat2=str.substring(27,33);
        String lng2=str.substring(36,43);
        addMarker(lat1,lng1,lat2,lng2);
    

 private void addMarker(String lat1,String lng1,String lat2,String lng2) 
     //you can use those value here then.
     final LatLng latLng=new LatLng(lat1,lng1);
     mMap.addMarker(new MarkerOptions().position(latLng).title("My      Marker"));