android - Detect when WebView finish loading a URL

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/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="16dp"     tools:context=".MainActivity"     android:background="#e8eae5"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textSize="20sp"         android:textColor="#000000"         android:padding="5dp"         />     <WebView         android:id="@+id/web_view"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_below="@id/tv"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Load URL"         android:layout_alignParentBottom="true"         android:layout_alignParentRight="true"         android:layout_alignParentEnd="true"         /> </RelativeLayout> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.webkit.WebChromeClient; import android.webkit.WebViewClient; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView; import android.webkit.WebView; import android.widget.Toast;   public class MainActivity extends AppCompatActivity {      private Context mContext;     private Activity mActivity;      private RelativeLayout mRelativeLayout;     private TextView mTextView;     private Button mButton;     private WebView mWebView;     private String mURL;      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();          // Get the activity         mActivity = MainActivity.this;          // Specify the url to surf         mURL = "http://www.google.com";          // Get the widgets reference from XML layout         mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);         mTextView = (TextView) findViewById(R.id.tv);         mButton = (Button) findViewById(R.id.btn);         mWebView = (WebView) findViewById(R.id.web_view);          // Set a click listener for button widget         mButton.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 // Set a WebViewClient for WebView                 mWebView.setWebViewClient(new WebViewClient(){                     @Override                     public void onPageStarted(WebView view, String url, Bitmap favicon){                         // Page loading started                         // Do something                     }                      /*                         public void onPageFinished (WebView view, String url)                             Notify the host application that a page has finished loading. This                             method is called only for main frame. When onPageFinished() is called,                             the rendering picture may not be updated yet. To get the notification                             for the new Picture, use onNewPicture(WebView, Picture).                          Parameters                             view WebView: The WebView that is initiating the callback.                             url String: The url of the page.                     */                     @Override                     public void onPageFinished(WebView view, String url){                         // Page loading finished                         Toast.makeText(mContext,"Page Loaded.",Toast.LENGTH_SHORT).show();                     }                 });                  // Set a WebChromeClient for WebView                 // Another way to determine when page loading finish                 mWebView.setWebChromeClient(new WebChromeClient(){                     /*                         public void onProgressChanged (WebView view, int newProgress)                             Tell the host application the current progress of loading a page.                          Parameters                             view WebView: The WebView that initiated the callback.                              newProgress int: Current page loading progress, represented by an                                 integer between 0 and 100.                     */                     public void onProgressChanged(WebView view, int newProgress){                         mTextView.setText("Page loading : " + newProgress + "%");                          if(newProgress == 100){                             // Page loading finish                             mTextView.setText("Page Loaded.");                         }                     }                 });                 // Enable JavaScript                 mWebView.getSettings().setJavaScriptEnabled(true);                  // Load the url in the WebView                 mWebView.loadUrl(mURL);             }         });     } }