android - How to navigate WebView back forward history

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="10dp"     tools:context=".MainActivity"     android:background="#fcfdfb"     >     <Button         android:id="@+id/btn_back"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Back"         android:enabled="false"         />     <Button         android:id="@+id/btn_forward"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Forward"         android:layout_alignParentRight="true"         android:layout_alignParentEnd="true"         android:enabled="false"         />     <WebView         android:id="@+id/web_view"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_below="@id/btn_back"         /> </RelativeLayout> 

MainActivity.java

 package com.cfsuman.me.androidcodesnippets;  import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.Window; import android.webkit.WebChromeClient; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.Toast;   public class MainActivity extends AppCompatActivity {     private Context mContext;     private Activity mActivity;      private RelativeLayout mRelativeLayout;     private WebView mWebView;     private Button mButtonBack;     private Button mButtonForward;      private String mUrl="http://developer.android.com/guide/index.html";      @Override     protected void onCreate(Bundle savedInstanceState) {         // Request window feature action kafetaria         requestWindowFeature(Window.FEATURE_ACTION_BAR);         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the application context         mContext = getApplicationContext();         // Get the activity         mActivity = MainActivity.this;          // Change the action kafetaria color         getSupportActionBar().setBackgroundDrawable(                 new ColorDrawable(Color.parseColor("#FFF91EC6"))         );          // Get the widgets reference from XML layout         mRelativeLayout = (RelativeLayout) findViewById(R.id.rl);         mWebView = (WebView) findViewById(R.id.web_view);         mButtonBack = (Button) findViewById(R.id.btn_back);         mButtonForward = (Button) findViewById(R.id.btn_forward);          // Request to render the web page         renderWebPage(mUrl);          // Set a click listener for back button         mButtonBack.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 /*                     public boolean canGoBack ()                         Gets whether this WebView has a back history item.                      Returns                         true : iff this WebView has a back history item                 */                 if (mWebView.canGoBack()) {                     /*                         public void goBack ()                             Goes back in the history of this WebView.                     */                     mWebView.goBack();                      // Display the notification                     Toast.makeText(mContext,"Go To Back",Toast.LENGTH_SHORT).show();                 }             }         });          // Set a click listener for forward button         mButtonForward.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 /*                     public boolean canGoForward ()                         Gets whether this WebView has a forward history item.                      Returns                         true : iff this WebView has a forward history item                 */                 if (mWebView.canGoForward()) {                     /*                         public void goForward ()                             Goes forward in the history of this WebView.                     */                     mWebView.goForward();                      // Display the notification                     Toast.makeText(mContext,"Go To Forward",Toast.LENGTH_SHORT).show();                 }             }         });     }      // Custom method to render a web page     protected void renderWebPage(String urlToRender) {         mWebView.setWebViewClient(new WebViewClient() {             @Override             public void onPageStarted(WebView view, String url, Bitmap favicon) {                 // Do something on page loading started             }              @Override             public void onPageFinished(WebView view, String url) {                 // Do something when page loading finished                  // Check web view back history availability                 if(mWebView.canGoBack()){                     mButtonBack.setEnabled(true);                 }else {                     mButtonBack.setEnabled(false);                 }                  // Check web view forward history availability                 if(mWebView.canGoForward()){                     mButtonForward.setEnabled(true);                 }else {                     mButtonForward.setEnabled(false);                 }             }         });          mWebView.setWebChromeClient(new WebChromeClient() {             public void onProgressChanged(WebView view, int newProgress) {             }         });          // Enable the javascript         mWebView.getSettings().setJavaScriptEnabled(true);          // Render the web page         mWebView.loadUrl(urlToRender);     }       /*         public void onBackPressed ()             Called when the activity has detected the user's press of the back key. The default             implementation simply finishes the current activity, but you can override this to             do whatever you want.     */     @Override     public void onBackPressed(){         Toast.makeText(mContext,"Back Key Pressed",Toast.LENGTH_SHORT).show();         // We also allow to navigate back history by pressing device back key         if(mWebView.canGoBack()){             Toast.makeText(mContext,"Back History Available",Toast.LENGTH_SHORT).show();             mWebView.goBack();         }else {             Toast.makeText(mContext,"No Back History Found",Toast.LENGTH_SHORT).show();             super.onBackPressed();         }     } }