弹出框+清除缓存

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private void showClearCacheDialog() {    new AlertDialog.Builder(this, AlertDialog.THEME_DEVICE_DEFAULT_LIGHT).setTitle("清理缓存")            .setNegativeButton("取消", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface dialog, int which) {                    dialog.dismiss();                }            }).setPositiveButton("确定", new DialogInterface.OnClickListener() {        @Override        public void onClick(DialogInterface dialog, int which) {            clearCache();            dialog.dismiss();        }    }).show();}/** * 清理缓存文件夹下的所有文件 */private void clearCache() {    File cacheDir = this.getCacheDir();    if (cacheDir != null && cacheDir.exists() && cacheDir.isDirectory()) {        for (File item : cacheDir.listFiles()) {            item.delete();        }    }}

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