Android WebView 清理缓存

private void clearCache(){
    File file = getCacheDir().getAbsoluteFile();//删除缓存
    deleteFile(file);
}

public void deleteFile(File file) {

    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();
    } 
}