android 删除文件，打开指定的文件类型
android 删除文件，打开指定的文件类型public class FileUtils {
/*** 删除指定文件* * @param fileNames*/public static void deleteFiles(String... fileNames) {if (fileNames.length <= 0)return;for (int i = 0; i < fileNames.length; i++) {File file = new File(fileNames[i]);if (file.exists())file.delete();
}}
/*** 删除指定文件夹下的所有文件* * @param path* @return*/public static boolean delAllFile(String path) {boolean flag = false;File file = new File(path);if (!file.exists()) {return flag;}if (!file.isDirectory()) {return flag;}String[] tempList = file.list();File temp = null;for (int i = 0; i < tempList.length; i++) {if (path.endsWith(File.separator)) {temp = new File(path + tempList[i]);} else {temp = new File(path + File.separator + tempList[i]);}if (temp.isFile()) {long lastModeify = temp.lastModified();long current = new Date().getTime();Log.e("文件创建时间", "current=" + current + " lastModeify="+ lastModeify);if (current - lastModeify > (1000 * 60 * 60 * 24 * 3)) {temp.delete();}}if (temp.isDirectory()) {delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件flag = true;}}return flag;}
/*** 文件是否存在* * @param nativePath* @return*/public static boolean isExists(String nativePath) {File file = new File(nativePath);return file.exists();
}
/*** 打开文件的方式* * @param f文件对象*/public static void openFile(File f, Context context) {if (!f.exists()) {
Toast.makeText(context, "文件尚未下载，无法查看，请您先下载文件！", Toast.LENGTH_SHORT).show();return;}
Intent intent = new Intent();intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.setAction(android.content.Intent.ACTION_VIEW);
/* 调用getMIMEType()来取得MimeType */String type = getMIMEType(f);/* 设置intent的file与MimeType */intent.setDataAndType(Uri.fromFile(f), type);context.startActivity(intent);}
/* 判断文件MimeType的method */private static String getMIMEType(File f) {String type = "";String fName = f.getName();/* 取得扩展名 */String end = fName.substring(fName.lastIndexOf(".") + 1, fName.length()).toLowerCase();
/* 依扩展名的类型决定MimeType */if (end.equals("m4a") || end.equals("mp3") || end.equals("mid")|| end.equals("xmf") || end.equals("ogg") || end.equals("wav")|| end.equals("wma")) {type = "audio";} else if (end.equals("3gp") || end.equals("mp4")) {type = "video";} else if (end.equals("jpg") || end.equals("gif") || end.equals("png")|| end.equals("jpeg") || end.equals("bmp")) {type = "image";} else if (end.equals("apk")) {/* android.permission.INSTALL_PACKAGES */type = "application/vnd.android.package-archive";} else {type = "*";}/* 如果无法直接打开，就跳出软件列表给用户选择 */if (end.equals("apk")) {} else {type += "/*";}return type;}