android6.0创建文件问题

Android在6.0有了动态权限管理，在文件创建时就需要动态权限。

Android的API对应版本如下：





首先检查并申请权限：
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            int writePermission = checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE);
            if(writePermission != PackageManager.PERMISSION_GRANTED){
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},REQUEST_CODE);
                return ;
            }
        }

申请权限回调：
@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if(requestCode == REQUEST_CODE){
            if(permissions[0].equals(Manifest.permission.WRITE_EXTERNAL_STORAGE) && grantResults[0] == PackageManager.PERMISSION_GRANTED){
                saveFile();
            }else{
                Toast.makeText(this,"授权失败",Toast.LENGTH_SHORT).show();
            }
        }
    }

保存文件saveFile代码如下：
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            File file = new File(Environment.getExternalStorageDirectory(), "lmlfiletest.txt");
            if(file.exists()){
                file.delete();
            }
            try {
                FileOutputStream fos = new FileOutputStream(file);
                String info = etInfo.getText().toString();
                fos.write(info.getBytes("utf-8"));
                fos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            Toast.makeText(this, "创建成功!", Toast.LENGTH_SHORT).show();
        }

测试成功！