Android6.0以上文件读写权限

1、AndroidManifest.xml 文件添加:

2、onCreate（）或其他访问文件位置添加授权

private void checkPermission() {
    //检查权限（NEED_PERMISSION）是否被授权 PackageManager.PERMISSION_GRANTED表示同意授权
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        //用户已经拒绝过一次，再次弹出权限申请对话框需要给用户一个解释
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission
                .WRITE_EXTERNAL_STORAGE)) {
            Toast.makeText(this, "请开通相关权限，否则无法正常使用本应用！", Toast.LENGTH_SHORT).show();
        }
        //申请权限
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_EXTERNAL_STORAGE);

    } else {
        Toast.makeText(this, "授权成功！", Toast.LENGTH_SHORT).show();
        Log.e(TAG_SERVICE, "checkPermission: 已经授权！");
    }
}