标签：android 文档 android开发 缓存 webview
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()); }
}
}标签：android 文档 android开发 缓存 webview
原文地址：http://blog.csdn.net/menglele1314/article/details/45841489
