WebSettings webseting = m_webview.getSettings();
webseting.setDomStorageEnabled(true);
webseting.setAppCacheMaxSize(1024*1024*8);//設置緩沖大小，我設的是8M
String appCacheDir = this.getApplicationContext().getDir("cache", Context.MODE_PRIVATE).getPath();
webseting.setAppCachePath(appCacheDir);
webseting.setAllowFileAccess(true);
webseting.setAppCacheEnabled(true);
webseting.setCacheMode(WebSettings.LOAD_DEFAULT);

m_webview.setWebChromeClient(m_chromeClient);
private WebChromeClient m_chromeClient = new WebChromeClient(){
//擴充緩存的容量
@Override
public void onReachedMaxAppCacheSize(long spaceNeeded,
long totalUsedQuota, WebStorage.QuotaUpdater quotaUpdater) {
quotaUpdater.updateQuota(spaceNeeded * 2);
}
};