webview和H5 清除缓存和缓存文件删除。

浏览数：26 / 时间：2015年06月09日
webview和H5 清除缓存和缓存文件删除。

缓存请看：http://blog.csdn.net/menglele1314/article/details/45717531

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 extends
Activity {  
   
    private
static final 
String APP_CACAHE_DIRNAME = "/webcache"; 
    private
TextView tv_topbar_title;  
    private
RelativeLayout rl_loading;  
    private
WebView mWebView;  
    private
String url;  
   
    @Override 
    protected
void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
           


        url =
"http://www.sina.com.cn"; 
        
initView();  
    } 
   
    private
void initView() { 
           
        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(new
WebViewClient() {  
   
            @Override 
            public
void onLoadResource(WebView view, String url) { 
                        


                super.onLoadResource(view, url); 
            } 
   
            @Override 
            public
boolean shouldOverrideUrlLoading(WebView webview, String url) { 
                   
                webview.loadUrl(url); 
   
                return
true;  
            } 
   
            @Override 
            public
void onPageStarted(WebView view, String url, Bitmap favicon) { 

                rl_loading.setVisibility(View.VISIBLE);
// 显示加载界面  
            } 
   
            @Override 
            public
void onPageFinished(WebView view, String url) { 
   
                String title = view.getTitle(); 
                tv_topbar_title.setText(title); 
                tv_topbar_title.setVisibility(View.VISIBLE); 
                rl_loading.setVisibility(View.GONE);
// 隐藏加载界面  
            } 
   
            @Override 
            public
void onReceivedError(WebView view,
int errorCode, String description, String failingUrl) { 
   
                rl_loading.setVisibility(View.GONE);
// 隐藏加载界面  
   
                Toast.makeText(getApplicationContext(),
"",  
                        Toast.LENGTH_LONG).show(); 
            } 
        }); 
   
        mWebView.setWebChromeClient(new
WebChromeClient() {  
   
            @Override 
            public
boolean onJsAlert(WebView view, String url, String message, JsResult result) { 
   

                Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show(); 
                result.confirm(); 
   
                return
true;  
            } 
   
            @Override 
            public
boolean onJsConfirm(WebView view, String url, String message, JsResult result) { 
   

                return
super.onJsConfirm(view, url, message, result); 
            } 
   
            @Override 
            public
boolean onJsPrompt(WebView view, String url, String message, String defaultValue, JsPromptResult result) { 
  

                return
super.onJsPrompt(view, url, message, defaultValue, result); 
            } 
        }); 
           
        mWebView.loadUrl(url); 
    } 
   
    private
void initWebView() {  
           
        mWebView.getSettings().setJavaScriptEnabled(true); 
        mWebView.getSettings().setRenderPriority(RenderPriority.HIGH); 
        mWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); 
//设置 缓存模式选择自己想要的模式

        // 开启 DOM storage API 功能 
        mWebView.getSettings().setDomStorageEnabled(true); 
        //开启 database storage API 功能 
        mWebView.getSettings().setDatabaseEnabled(true);  
        String cacheDirPath = getFilesDir().getAbsolutePath()+APP_CACAHE_DIRNAME; 

        //设置数据库缓存路径 
        mWebView.getSettings().setDatabasePath(cacheDirPath); 
        //设置  Application Caches 缓存目录 
        mWebView.getSettings().setAppCachePath(cacheDirPath); 
        //开启 Application Caches 功能 
        mWebView.getSettings().setAppCacheEnabled(true); 
    } 
       
    /**
     * 清除WebView缓存  在onDestroy调用这个方法就可以了

     */ 
    public
void clearWebViewCache(){ 
           
        //清理Webview缓存数据库 
        try
{  
            deleteDatabase("webview.db");  
            deleteDatabase("webviewCache.db"); 
        }
catch (Exception e) { 
            e.printStackTrace(); 
        } 
           
        //WebView 缓存文件 
        File appCacheDir =
new File(getFilesDir().getAbsolutePath()+APP_CACAHE_DIRNAME); 
        Log.e(TAG,
"appCacheDir path="+appCacheDir.getAbsolutePath()); 
           
        File webviewCacheDir =
new File(getCacheDir().getAbsolutePath()+"/webviewCache"); 
        Log.e("path===",
"webviewCacheDir path="+webviewCacheDir.getAbsolutePath()); 
           
        //删除webview 缓存目录 
        if(webviewCacheDir.exists()){ 
            deleteFile(webviewCacheDir); 
        } 
        //删除webview 缓存 缓存目录 
        if(appCacheDir.exists()){ 
            deleteFile(appCacheDir); 
        } 
    } 
       
    /**
     * 递归删除 文件/文件夹
     * 
     * @param file
     */ 
    public
void deleteFile(File file) { 
   
        Log.i(TAG,
"delete file path=" 
+ file.getAbsolutePath());  
           
        if
(file.exists()) {  
            if
(file.isFile()) {  
                file.delete(); 
            }
else if
(file.isDirectory()) {  
                File files[] = file.listFiles(); 
                for
(int 
i = 0; i < files.length; i++) { 
                    deleteFile(files[i]); 
                } 
            } 
            file.delete(); 
        }
else {  
            Log.e("delete===",
"delete file no exists " 
+ file.getAbsolutePath());  
        } 
    } 
   
}