Question

我正在使用Googe Map API V2和android制作一个Android应用程序。这是我放置标记的代码：

private void addBusStopMarker(){
    final Intent intent1;
    map.addMarker(new MarkerOptions().position(new LatLng(1.28213,103.81721)).title("10009 - Bt Merah Ctrl").icon(BitmapDescriptorFactory.fromResource(R.drawable.busstopicon)).snippet("Average Commuters: 9,940"));
    map.addMarker(new MarkerOptions().position(new LatLng(1.28294,103.82166)).title("10089 - Jln Bt Merah - B08").icon(BitmapDescriptorFactory.fromResource(R.drawable.busstopicon)).snippet("Average Commuters: 2,050"));
    map.setOnMarkerClickListener(new OnMarkerClickListener()
    {

        @Override
        public boolean onMarkerClick(Marker arg0) {
             if(arg0.getTitle().equals("10009 - Bt Merah Ctrl"))
                 intent1 = new Intent(context, PopulationCharts.class);
                 startActivity(intent1);       
            return true;
        }
    });    
}

基本上我要做的是当选择标记时，它将显示来自上面代码的信息窗口。然后，当我选择片段时，它将执行onMarkerClick事件。

但是，从上面的代码中，它显示了一条错误消息：The final local variable intent1 cannot be assigned, since it is defined in an enclosing type。此外，我不知道如何设置标记片段onClick事件。提前谢谢。

已编辑的部分

map.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {
           Intent intent = new Intent(context ,PopulationCharts.class);
           startActivity(intent);


        }
    });

错误消息

07-29 12:24:12.774: E/AndroidRuntime(15704): FATAL EXCEPTION: main
07-29 12:24:12.774: E/AndroidRuntime(15704): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.googlemap/com.example.googlemap.PopulationCharts}: java.lang.NullPointerException
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1894)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.os.Looper.loop(Looper.java:137)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.main(ActivityThread.java:4512)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.reflect.Method.invokeNative(Native Method)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.reflect.Method.invoke(Method.java:511)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at dalvik.system.NativeStart.main(Native Method)
07-29 12:24:12.774: E/AndroidRuntime(15704): Caused by: java.lang.NullPointerException
07-29 12:24:12.774: E/AndroidRuntime(15704):    at com.example.googlemap.PopulationCharts.<init>(PopulationCharts.java:28)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.Class.newInstanceImpl(Native Method)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.Class.newInstance(Class.java:1319)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.Instrumentation.newActivity(Instrumentation.java:1026)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1885)
07-29 12:24:12.774: E/AndroidRuntime(15704):    ... 11 more
07-29 12:24:20.563: I/Process(15704): Sending signal. PID: 15704 SIG: 9

人口类

package com.example.googlemap;

public class PopulationCharts extends Activity{

    Intent intent = getIntent();
    String markerTitle= intent.getExtras().getString("markertitle");

    //Pie chart 
    private GraphicalView chartPop;
    private String[] ageGroupPop;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.population_charts);
        openChartAgeGroupPop();
        openChartPeakPop();
    }

    private void openChartAgeGroupPop(){     
        //codes to generate pie chart
    }

    //Line chart
    private View lineChart;
    private String[] time = new String[] {
            "0700", "0800" , "0900", "1000", "1100", "1200", "1300", "1400", "1500", "1600", "1700", "1800"};

    public void openChartPeakPop(){
        //code to generate multiple line chart
    }
}

Answer 1

您可以使用OnInfoWindowClickListener，因此当您点击标记时，它会首先显示Infowindow，当点击该窗口时，它将开始活动

<强>样品：

map.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {
    @Override
    public void onInfoWindowClick(Marker marker) {
       Intent intent1 = new Intent(context, PopulationCharts.class);
       String title = marker.getTitle();
       intent1.putExtra("markertitle", title);
       startActivity(intent1);  
    }
});

获取PopulationCharts活动类中的值

Intent intent = getIntent();
String markerTitle= intent.getExtras().getString("markertitle");

Answer 2

使用事件 setOnInfoWindowClickListener 的语法是：

map.setOnInfoWindowClickListener(new OnInfoWindowClickListener(){           
        @Override
        public void onInfoWindowClick(Marker marker){
          if(marker.getTitle().equals("10009 - Bt Merah Ctrl")){
            Intent info = new Intent(getApplicationContext(), YourActivity.class);
            startActivity(info);
          }
        }
    });

谷歌地图标记OnClick事件

2 个答案: