webviewとH 5はキャッシュとキャッシュファイルの削除をクリアします。

import java.io.File; 
   
import android.app.Activity; 
import android.graphics.Bitmap; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.webkit.JsPromptResult; 
import android.webkit.JsResult; 
import android.webkit.WebChromeClient; 
import android.webkit.WebSettings; 
import android.webkit.WebSettings.RenderPriority; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.RelativeLayout; 
import android.widget.TextView; 
import android.widget.Toast; 
   
public class MainActivity extendsActivity { 
   
    privatestaticfinal String APP_CACAHE_DIRNAME ="/webcache"; 
    privateTextView tv_topbar_title; 
    privateRelativeLayout rl_loading; 
    privateWebView mWebView; 
    privateString url; 
   
    @Override 
    protectedvoidonCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
           
        url ="http://www.sina.com.cn"; 
        initView(); 
    } 
   
    privatevoidinitView() { 
           
        tv_topbar_title = (TextView) findViewById(R.id.tv_topbar_title); 
     
        rl_loading = (RelativeLayout) findViewById(R.id.rl_loading); 
           
        mWebView = (WebView) findViewById(R.id.mWebView); 
           
        initWebView(); 
           
        mWebView.setWebViewClient(newWebViewClient() { 
   
            @Override 
            publicvoidonLoadResource(WebView view, String url) { 
                        
                super.onLoadResource(view, url); 
            } 
   
            @Override 
            publicbooleanshouldOverrideUrlLoading(WebView webview, String url) { 
                   
                webview.loadUrl(url); 
   
                returntrue; 
            } 
   
            @Override 
            publicvoidonPageStarted(WebView view, String url, Bitmap favicon) { 

                rl_loading.setVisibility(View.VISIBLE);//        
            } 
   
            @Override 
            publicvoidonPageFinished(WebView view, String url) { 
   
                String title = view.getTitle(); 
                tv_topbar_title.setText(title); 
                tv_topbar_title.setVisibility(View.VISIBLE); 
                rl_loading.setVisibility(View.GONE);//        
            } 
   
            @Override 
            publicvoidonReceivedError(WebView view,interrorCode, String description, String failingUrl) { 
   
                rl_loading.setVisibility(View.GONE);//        
   
                Toast.makeText(getApplicationContext(),"", 
                        Toast.LENGTH_LONG).show(); 
            } 
        }); 
   
        mWebView.setWebChromeClient(newWebChromeClient() { 
   
            @Override 
            publicbooleanonJsAlert(WebView view, String url, String message, JsResult result) { 
  
                Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show(); 
                result.confirm(); 
   
                returntrue; 
            } 
   
            @Override 
            publicbooleanonJsConfirm(WebView view, String url, String message, JsResult result) { 
  
                returnsuper.onJsConfirm(view, url, message, result); 
            } 
   
            @Override 
            publicbooleanonJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) { 
 
                returnsuper.onJsPrompt(view, url, message, defaultValue, result); 
            } 
        }); 
           
        mWebView.loadUrl(url); 
    } 
   
    privatevoidinitWebView() { 
           
        mWebView.getSettings().setJavaScriptEnabled(true); 
        mWebView.getSettings().setRenderPriority(RenderPriority.HIGH); 
        mWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); //                
        //    DOM storage API    
        mWebView.getSettings().setDomStorageEnabled(true); 
        //   database storage API    
        mWebView.getSettings().setDatabaseEnabled(true);  
        String cacheDirPath = getFilesDir().getAbsolutePath()+APP_CACAHE_DIRNAME; 

        //          
        mWebView.getSettings().setDatabasePath(cacheDirPath); 
        //    Application Caches      
        mWebView.getSettings().setAppCachePath(cacheDirPath); 
        //   Application Caches    
        mWebView.getSettings().setAppCacheEnabled(true); 
    } 
       
    /**
     *   WebView     onDestroy          
     */ 
    publicvoidclearWebViewCache(){ 
           
        //  Webview      
        try{ 
            deleteDatabase("webview.db");  
            deleteDatabase("webviewCache.db"); 
        }catch(Exception e) { 
            e.printStackTrace(); 
        } 
           
        //WebView      
        File appCacheDir =newFile(getFilesDir().getAbsolutePath()+APP_CACAHE_DIRNAME); 
        Log.e(TAG,"appCacheDir path="+appCacheDir.getAbsolutePath()); 
           
        File webviewCacheDir =newFile(getCacheDir().getAbsolutePath()+"/webviewCache"); 
        Log.e("path===","webviewCacheDir path="+webviewCacheDir.getAbsolutePath()); 
           
        //  webview      
        if(webviewCacheDir.exists()){ 
            deleteFile(webviewCacheDir); 
        } 
        //  webview         
        if(appCacheDir.exists()){ 
            deleteFile(appCacheDir); 
        } 
    } 
       
    /**
     *        /   
     * 
     * @param file
     */ 
    publicvoiddeleteFile(File file) { 
   
        Log.i(TAG,"delete file path="+ file.getAbsolutePath()); 
           
        if(file.exists()) { 
            if(file.isFile()) { 
                file.delete(); 
            }elseif(file.isDirectory()) { 
                File files[] = file.listFiles(); 
                for(inti = 0; i < files.length; i++) { 
                    deleteFile(files[i]); 
                } 
            } 
            file.delete(); 
        }else{ 
            Log.e("delete===","delete file no exists "+ file.getAbsolutePath()); 
        } 
    } 
   
}