webview和H5 清除缓存和缓存文件删除。

webview和H5 清除缓存和缓存文件删除。

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()); 

        } 


    } 


}