android - Add text box to wearable screen - beginner -

here code i'm using read heart rate wearable :

import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.os.bundle; import android.support.wearable.activity.wearableactivity; import android.util.log; import android.widget.textview; import android.hardware.*; import android.support.wearable.view.boxinsetlayout.*;  public class mainactivity extends wearableactivity implements sensoreventlistener {      private static final string tag = "mainactivity";     private textview mtextviewheart;     sensormanager msensormanager;     sensor mheartratesensor;     sensoreventlistener sensoreventlistener;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main_activity);           mtextviewheart = new textview(this);         mtextviewheart.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content));         mtextviewheart.settext("heart rate ");          msensormanager = ((sensormanager) getsystemservice(sensor_service));         mheartratesensor = msensormanager.getdefaultsensor(sensor.type_heart_rate);        // msensormanager.registerlistener(this, mheartratesensor, sensormanager.sensor_delay_normal);         log.i(tag, "listener registered.");         mtextviewheart.settext("something here");          msensormanager.registerlistener(this, mheartratesensor, msensormanager.sensor_delay_fastest);         // msensormanager.registerlistener(sensoreventlistener, mheartratesensor, msensormanager.sensor_delay_fastest);     }       public void onresume(){         super.onresume();     }      public void onaccuracychanged(sensor sensor, int accuracy) {         log.d(tag, "onaccuracychanged - accuracy: " + accuracy);     }      public void onsensorchanged(sensorevent event) {         if (event.sensor.gettype() == sensor.type_heart_rate) {             string msg = "" + (int)event.values[0];             mtextviewheart.settext(msg);             log.d(tag, msg);         }         else             log.d(tag, "unknown sensor type");     }  } 

main_activity.xml :

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:background="@color/white">      <android.support.wearable.view.gridviewpager         android:id="@+id/pager"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.wearable.view.dotspageindicator         android:id="@+id/page_indicator"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_centerhorizontal="true"         android:layout_marginbottom="10dp"         android:padding="5dp"         android:background="@drawable/rounded_background">     </android.support.wearable.view.dotspageindicator>  </relativelayout> 

the sensor functionality seems fine. text boxes not being displayed on screen, instead receive blank screen. how add mtextviewheart screen programmatically ? or required add via main_activity.xml ?

update :

import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.os.bundle; import android.support.wearable.activity.wearableactivity; import android.util.log; import android.widget.relativelayout; import android.widget.textview; import android.hardware.*; import android.support.wearable.view.boxinsetlayout.*;  public class mainactivity extends wearableactivity implements sensoreventlistener {      private static final string tag = "mainactivity";     private textview mtextviewheart;     sensormanager msensormanager;     sensor mheartratesensor;     sensoreventlistener sensoreventlistener;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main_activity);         relativelayout relativelayout = (relativelayout )findviewbyid(r.id.parent);          mtextviewheart = new textview(this);         mtextviewheart.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content));         mtextviewheart.settext("heart rate ");          msensormanager = ((sensormanager) getsystemservice(sensor_service));         mheartratesensor = msensormanager.getdefaultsensor(sensor.type_heart_rate);         log.i(tag, "listener registered.");         mtextviewheart.settext("something here");          msensormanager.registerlistener(this, mheartratesensor, msensormanager.sensor_delay_fastest);           relativelayout.addview(mtextviewheart);      }       public void onresume(){         super.onresume();     }      public void onaccuracychanged(sensor sensor, int accuracy) {         log.d(tag, "onaccuracychanged - accuracy: " + accuracy);     }      public void onsensorchanged(sensorevent event) {         if (event.sensor.gettype() == sensor.type_heart_rate) {             string msg = "" + (int)event.values[0];             mtextviewheart.settext(msg);             log.d(tag, msg);         }         else             log.d(tag, "unknown sensor type");     }  } 

main_activity.xml :

<?xml version="1.0" encoding="utf-8"?>  <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/parent"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@color/white">      <android.support.wearable.view.gridviewpager         android:id="@+id/pager"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.wearable.view.dotspageindicator         android:id="@+id/page_indicator"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_centerhorizontal="true"         android:layout_marginbottom="10dp"         android:padding="5dp"         android:background="@drawable/rounded_background">     </android.support.wearable.view.dotspageindicator>  </relativelayout> 

i've updated pavneet singh answer blank screen displayed.

maybe should configure ui via xml ?

update2 :

updating use linearlayout not have impact :

<?xml version="1.0" encoding="utf-8"?>  <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingleft="16dp"     android:paddingright="16dp"     android:orientation="vertical" >      <android.support.wearable.view.gridviewpager         android:id="@+id/pager"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.wearable.view.dotspageindicator         android:id="@+id/page_indicator"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:layout_centerhorizontal="true"         android:layout_marginbottom="10dp"         android:padding="5dp"         android:background="@drawable/rounded_background">     </android.support.wearable.view.dotspageindicator>  </linearlayout>  package com.example.android.wearable.datalayer;  import android.hardware.sensoreventlistener; import android.hardware.sensormanager; import android.os.bundle; import android.support.wearable.activity.wearableactivity; import android.util.log; import android.widget.linearlayout; import android.widget.relativelayout; import android.widget.textview; import android.hardware.*; import android.support.wearable.view.boxinsetlayout.*;  public class mainactivity extends wearableactivity implements sensoreventlistener {      private static final string tag = "mainactivity";     private textview mtextviewheart;     sensormanager msensormanager;     sensor mheartratesensor;     sensoreventlistener sensoreventlistener;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main_activity);         linearlayout relativelayout = (linearlayout )findviewbyid(r.id.parent);          mtextviewheart = new textview(this);         mtextviewheart.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content));         mtextviewheart.settext("heart rate ");          msensormanager = ((sensormanager) getsystemservice(sensor_service));         mheartratesensor = msensormanager.getdefaultsensor(sensor.type_heart_rate);         log.i(tag, "listener registered.");         mtextviewheart.settext("something here");          msensormanager.registerlistener(this, mheartratesensor, msensormanager.sensor_delay_fastest);           relativelayout.addview(mtextviewheart);      }       public void onresume(){         super.onresume();     }      public void onaccuracychanged(sensor sensor, int accuracy) {         log.d(tag, "onaccuracychanged - accuracy: " + accuracy);     }      public void onsensorchanged(sensorevent event) {         if (event.sensor.gettype() == sensor.type_heart_rate) {             string msg = "" + (int)event.values[0];             mtextviewheart.settext(msg);             log.d(tag, msg);         }         else             log.d(tag, "unknown sensor type");     }  } 

adding edittext field not display :

<edittext     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignparenttop="true"     android:layout_centerhorizontal="true"     android:layout_margintop="121dp"     android:ems="10"     android:text="test"     /> 

could issue fundamental ?

this screen layout displays :

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/linearlayout1"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >      <button         android:id="@+id/button1"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="click me screen" />      <textview         android:id="@+id/textview1"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="i'm screen 1 (main.xml)"         android:textappearance="?android:attr/textappearancelarge" />  </linearlayout>