Question

我有返回位置纬度的方法

public double[] getlat(){
     double lat[]=new double[20];

     JSONObject json = JSONFunction.getJSONfromURL("https://maps.googleapis.com/maps/api/place/search/json?location=-33.8670522,151.1957362&radius=1000&types=bank&sensor=true&key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");    
try{
    JSONArray  JArray = json.getJSONArray("results");
       Log.v(TAG, "getting results");
    for(int i=0;i<JArray.length();i++){                     
        JSONObject e = JArray.getJSONObject(i);
        JSONObject location=e.getJSONObject("geometry").getJSONObject("location");
        lat[i] = location.getDouble("lat");     
}catch(JSONException e)        {
     Log.e("log_tag", "Error parsing data "+e.toString());
}

return lat;

}

我在主要活动中收到了这个数组

    public class Test extends Activity {
   private static final String TAG = "test";

/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle icicle) {
    // Be sure to call the super class.
    super.onCreate(icicle);
     StringBuilder sb =new StringBuilder();
    double a[]=getlat();
    for(int i=0;i<a.length;i++) {
        sb.append(a[i]+"\n");
    }
 TextView tv=(TextView)findViewById(R.id.text);
 tv.setText(sb);
 }

给我nullpointor异常但是在logcat中我可以看到显示的纬度数组问题在于拉回纬度。纠正我错在哪里..

Answer 1

你不能在setContentView()方法中使用onCreate() ..

tv.setText(sb);，所以这一行给你错误..因为它找不到textView。

Answer 2

您的Variable sb是一个StringBuilder，请更新您的代码

tv.setText（sb.toString（））;

返回纬度或经度数组

2 个答案: