android - How to display sensor data values -


hi new android. trying write code collect sensor data. tried example given in "http://developer.android.com/guide/topics/sensors/sensors_overview.html" installed apk file on phone (samsung galaxy s3) app runs crashes. code have written:

the app crashes whenever put line "tv1.settext(float.tostring(lux));" in onsensoechanged() method. kindly tell me doing wrong here , how correct code.

this first post in site. apologies incorrect format of posting questions

thanks

`

package com.example.sensordata;  import android.support.v7.app.actionbaractivity; import android.support.v7.app.actionbar; import android.support.v4.app.fragment; import android.app.activity; import android.content.context; import android.hardware.sensor; import android.hardware.sensorevent; import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.os.bundle; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup; import android.widget.textview; import android.os.build;  public class mainactivity extends activity implements sensoreventlistener {        public sensormanager msensormanager;       public sensor mlight;        public textview tv1;       //public textview tv2;        @override       public final void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          msensormanager = (sensormanager) getsystemservice(context.sensor_service);         mlight = msensormanager.getdefaultsensor(sensor.type_light);          tv1 = (textview) findviewbyid(r.id.text1);         //tv2 = (textview) findviewbyid(r.id.text2);            }        @override       public final void onaccuracychanged(sensor sensor, int accuracy) {         // here if sensor accuracy changes.       }        @override       public final void onsensorchanged(sensorevent event) {         // light sensor returns single value.         // many sensors return 3 values, 1 each axis.           synchronized (this) {               float lux = event.values[0];                 // sensor value.                 //tv1 = (textview) findviewbyid(r.id.text1);               tv1.settext(float.tostring(lux));            }        }        @override       protected void onresume() {         super.onresume();         msensormanager.registerlistener(this, mlight, sensormanager.sensor_delay_normal);        }        @override       protected void onpause() {         super.onpause();         msensormanager.unregisterlistener(this);       }     } `

try tv1.settext(string.valueof(lux)); instead of tv1.settext(float.tostring(lux));


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