Android WebView Onclick ProgressBar

Question

是的，我读了几乎所有关于webview进度条的主题，尝试几乎所有东西。但他们不适合我，我的应用程序崩溃时，我使用的例子。

我在我的webview应用程序中使用本地（ondevice）html，我想在链接点击该html后显示进度条（通知）。这是我的代码。

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 
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:id="@+id/activity_main" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.dijitalyayincim.cekmekoy.cekmekoy_web.MainActivity"> 

    <WebView 
    android:id="@+id/activity_main_webview" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" > 

</WebView> 

</RelativeLayout> 

Main_Activity.java

package com.dijitalyayincim.cekmekoy.cekmekoy_web; 

import android.support.v7.app.ActionBar; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 

public class MainActivity extends AppCompatActivity { 
private WebView mWebView; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    ActionBar ab =getSupportActionBar(); 
    ab.setDisplayShowHomeEnabled(true); 
    ab.setIcon(R.mipmap.ic_launcher); 
    mWebView = (WebView) findViewById(R.id.activity_main_webview); 
    WebSettings webSettings = mWebView.getSettings(); 
    webSettings.setJavaScriptEnabled(true); 

    mWebView.loadUrl("file:///android_asset/www/index.html"); 
    mWebView.setWebViewClient(new MyAppWebViewClient()); 


} 
@Override 
public void onBackPressed() { 
    if(mWebView.canGoBack()) { 
     mWebView.goBack(); 
    } else { 
     super.onBackPressed(); 
    } 
    } 
} 

MyAppWebViewClient.java

package com.dijitalyayincim.cekmekoy.cekmekoy_web; 

import android.content.Intent; 
import android.net.Uri; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 

/** 
* Created by ahmet.sevinc on 18.11.2016. 
*/ 

public class MyAppWebViewClient extends WebViewClient { 

@Override 
public boolean shouldOverrideUrlLoading(WebView view, String url) { 
    if(Uri.parse(url).getHost().endsWith("cekmekoy.info")) { 
     return false; 
    } 

    Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url)); 
    view.getContext().startActivity(intent); 
    return true; 
} 
} 

Answer 1

此代码工作完美的我..试试看

import android.app.Activity; 
import android.app.ProgressDialog; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.support.v4.view.GravityCompat; 
import android.support.v4.widget.DrawerLayout; 
import android.support.v7.app.ActionBar; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.webkit.WebSettings; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.ProgressBar; 

public class About_Activity extends AppCompatActivity { 
    private WebView webView; 
    private boolean isRedirected; 

    private ProgressBar progress; 
    String url = "Your URL"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_settings); 

     ActionBar actionBar = getSupportActionBar(); 
     if (actionBar != null) { 
      // Show the Up button in the action bar. 
      actionBar.setDisplayHomeAsUpEnabled(true); 
     } 

     webView = (WebView) findViewById(R.id.webView); 
     startWebView(webView, url); 

    } 

    private void startWebView(WebView webView,String url) { 

     webView.setWebViewClient(new WebViewClient() { 
      ProgressDialog progressDialog; 

      public boolean shouldOverrideUrlLoading(WebView view, String url) { 
       view.loadUrl(url); 
       isRedirected = true; 
       return false; 
      } 

      @Override 
      public void onPageStarted(WebView view, String url, Bitmap favicon) { 
       super.onPageStarted(view, url, favicon); 
       isRedirected = false; 
      } 

      public void onLoadResource (WebView view, String url) { 
       if (!isRedirected) { 
        if (progressDialog == null) { 
         progressDialog = new ProgressDialog(About_Activity.this); 
         progressDialog.setMessage("Loading..."); 
         progressDialog.show(); 
        } 
       } 

      } 
      public void onPageFinished(WebView view, String url) { 
       try{ 
        isRedirected=true; 

        if (progressDialog.isShowing()) { 
         progressDialog.dismiss(); 
         progressDialog = null; 
        } 



       }catch(Exception exception){ 
        exception.printStackTrace(); 
       } 
      } 

     }); 

     webView.getSettings().setJavaScriptEnabled(true); 
     webView.loadUrl(url); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // handle arrow click here 
     if (item.getItemId() == android.R.id.home) { 
      finish(); // close this activity and return to preview activity (if there is any) 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 

layout.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 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" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="in.invis.navigationdrawer.MainActivity" 
    tools:showIn="@layout/app_bar_main"> 

    <WebView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/webView" 
     /> 
</RelativeLayout> 

Answer 2

你可以试试这个，

mWebview = (WebView) findViewById(R.id.mWebview); 
mWebview.setWebViewClient(new myWebClient()); 
    mWebview.getSettings().setJavaScriptEnabled(true); 
    mWebview.loadUrl("file:///android_asset/www/index.html"); 

/** 
* Load Webview with using Progressbar 
*/ 
public class myWebClient extends WebViewClient { 
@Override 
public void onPageStarted(WebView view, String url, Bitmap favicon) { 
    // TODO Auto-generated method stub 
    super.onPageStarted(view, url, favicon); 
} 

@Override 
public boolean shouldOverrideUrlLoading(WebView view, String url) { 
    // TODO Auto-generated method stub 

    view.loadUrl(url); 
    return true; 

} 

@Override 
public void onPageFinished(WebView view, String url) { 
    // TODO Auto-generated method stub 
    super.onPageFinished(view, url); 

    progressBar.setVisibility(View.GONE); 
} 

}