WebView and loadData showing white screen in Android Constraints Layout -


i trying use constraints , webview , loaddata , got white screen. when changed linearlayout worked. try linearlayout inside constraint, white screen. there solution work constraints? thanks;

mainactivity

package com.example.grady.webviewdemo;  import android.os.bundle; import android.support.v7.app.appcompatactivity; import android.webkit.webview;  public class mainactivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          webview mwebview = (webview) findviewbyid(r.id.mywebview);         string myhtmlstring = "<html> <head><meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\"></head><body>" +                 "<h2>this html heading in android webview.</h2>\n" +                 "<p>this html paragraph in android webview.</p>\n" +                 "\n" +                 "<h4>following html table in webview</h4>\n" +                 "<table border=\"1\" width=\"100%\">\n" +                 "  <tr>\n" +                 "    <td>android</td>\n" +                 "    <td>webview</td>\t\t\n" +                 "    <td>100</td>\n" +                 "  </tr>\n" +                 "  <tr>\n" +                 "    <td>android</td>\n" +                 "    <td>webview</td>\t\t\n" +                 "    <td>200</td>\n" +                 "  </tr>\n" +                 "  <tr>\n" +                 "    <td>android</td>\n" +                 "    <td>webview</td>\t\t\n" +                 "    <td>300</td>\n" +                 "  </tr>\n" +                 "</table>" +                 "</body></html>";         mwebview.loaddata(myhtmlstring, "text/html; charset=utf-8", null);     } }

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.constraintlayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com.example.grady.webviewdemo.mainactivity">      <linearlayout         android:layout_width="match_parent"         android:layout_height="match_parent">          <webview             android:id="@+id/mywebview"             android:layout_width="fill_parent"             android:layout_height="fill_parent" />      </linearlayout> </android.support.constraint.constraintlayout>

the code provided working me. can try this:

xml:

<android.support.constraint.constraintlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     android:id="@+id/root"     android:layout_width="match_parent"     android:layout_height="match_parent">      <webview         android:id="@+id/mywebview"         android:layout_width="match_parent"         android:layout_height="match_parent"         app:layout_constraintbottom_tobottomof="parent"         app:layout_constraintleft_toleftof="parent"         app:layout_constraintright_torightof="parent"         app:layout_constrainttop_totopof="parent" />  </android.support.constraint.constraintlayout>

gradle:

compile 'com.android.support.constraint:constraint-layout:1.0.2'

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