Android6.0 WebView shows blank page

Question

I tried to load the page using webView and it just shows a blank page on my mobile phone. Here are the codes and classes.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.bobqiu.http_01" > <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:hardwareAccelerated="false"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-permission android:name="android.permission.INTERNET"/> 

activity_main.xml

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.example.bobqiu.http_01.MainActivity"> <WebView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/webview1" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_marginBottom="72dp" /> </RelativeLayout> 

HttpThread.java

 package com.example.bobqiu.http_01; import android.os.Handler; import android.webkit.WebView; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; /** * Created by Bobqiu on 2016/9/22. */ public class HttpThread extends Thread { private String url; private WebView webView; private Handler handler; public HttpThread(String url,WebView webView,Handler handler){ this.url = url; this.webView = webView; this.handler = handler; } public void run(){ try { URL httpUrl = new URL(url); try { HttpURLConnection connection = (HttpURLConnection) httpUrl.openConnection(); connection.setReadTimeout(5000); connection.setRequestMethod("GET"); final StringBuffer sb = new StringBuffer(); BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream())); String str; while((str = reader.readLine())!=null){ sb.append(str); } handler.post(new Runnable() { @Override public void run() { webView.loadData(sb.toString(),"text/html; charset=utf-8",null); } }); } catch (IOException e) { e.printStackTrace(); } } catch (MalformedURLException e) { e.printStackTrace(); } } } 

MainActivity.java

 package com.example.bobqiu.http_01; import android.Manifest; import android.os.Handler; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.webkit.WebView; public class MainActivity extends AppCompatActivity { private WebView webView; private Handler handler = new Handler(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); webView= (WebView) this.findViewById(R.id.webview1); webView.getSettings().setDomStorageEnabled(true); webView.getSettings().setJavaScriptEnabled(true); int permissionCheckContextCompat. checkSelfPermission(MainActivity.this, Manifest.permission.INTERNET); System.out.println("!!!!!"+permissionCheck);//it shows 0 in console new HttpThread("https://m.baidu.com/",webView,handler).start(); } } 

I also tried the webView.loadDataWithBaseURL method, still not working ... Please help me, thanks!

Answer 1

no need to load data into SubThread ...

you can register string assembly information before webView loads it

webView.loadData (string URL) works well

--- update I'm trying to run your code (23 and 19):

Answer 2

Add permission to access the Internet in the manifest. Without this, your application will not be able to access Internet services.

 <manifest xlmns:android...> ... <uses-permission android:name="android.permission.INTERNET" /> <application ... </manifest> 

Edited -

In android M and above, you should ask the user for permission at runtime. Before calling

 new HttpThread("https://m.baidu.com/",webView,handler).start(); 

run this code to grant permissions -

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { if (checkSelfPermission(Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED) { // Should we show an explanation? if (shouldShowRequestPermissionRationale( Manifest.permission.INTERNET)) { // Explain to the user why we need to read the contacts } requestPermissions(new String[]{Manifest.permission.INTERNET}, 1); // MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE is an // app-defined int constant return; }else { new HttpThread("https://m.baidu.com/",webView,handler).start(); } }else { new HttpThread("https://m.baidu.com/",webView,handler).start(); } 

And override this method -

 @Override public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) { switch (requestCode) { case 1: { // If request is cancelled, the result arrays are empty. if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { // permission was granted, yay! Do the // contacts-related task you need to do. new HttpThread("https://m.baidu.com/",webView,handler).start(); } else { // permission denied, boo! Disable the // functionality that depends on this permission. Snackbar.make(parent, "Click on allow to Access Internet in you application", Snackbar.LENGTH_LONG) .setAction("CLOSE", new View.OnClickListener() { @Override public void onClick(View view) { } }) .setActionTextColor(getResources().getColor(android.R.color.holo_purple )).show(); } return; } // other 'case' lines to check for other // permissions this app might request } } 

After that, it should work on your Android M phone as well. I hope this works.

Answer 3

Try loading the data as follows:

 webView.loadData(sb.toString(),"text/html",UTF-8); 

or that:

 webView.loadDataWithBaseURL("",sb.toString(),"text/html",UTF-8,"");