空指针异常'java.lang.String java.io.File.getAbsolutePath()' on a null object reference

问题遇到的现象和发生背景

在做安卓开发的录音上传服务器这一功能时遇到如下错误

问题相关代码，请勿粘贴截图

运行结果及报错内容

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.io.File.getAbsolutePath()' on a null object reference

我的解答思路和尝试过的方法

报错显示没有实例化 但是我已经对currentRecordFile进行了实例化

我想要达到的结果

这是问题相关代码
iv_record.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File dir = getExternalFilesDir(Environment.DIRECTORY_DOCUMENTS);
//File dir = new File("/sdcard/myRecord/");//在sd下创建文件夹myimage；Environment.getExternalStorageDirectory()得到SD卡路径文件
if (!dir.exists()) { //exists()判断文件是否存在，不存在则创建文件
dir.mkdirs();
}
SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd_HHmmss");//设置日期格式在android中，创建文件时，文件名中不能包含“：”冒号
String filename = df.format(new Date());
currentRecordFile = new File(dir, filename + ".amr");
Log.e("kk", "onClick: " + currentRecordFile.getAbsolutePath() );
if (!currentRecordFile.exists()) {
try {
currentRecordFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
if (Build.VERSION.SDK_INT >= 24){
uri1 = FileProvider.getUriForFile(MainActivity.this,"com.example.net.fileprovider", currentRecordFile);
}else {
uri1 = Uri.fromFile(currentRecordFile);
}
Intent intent = new Intent();
intent.setAction(MediaStore.Audio.Media.RECORD_SOUND_ACTION);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri1);
startActivityForResult(intent, RECORDER_SOUND);
}
});

case RECORDER_SOUND:
//Toast.makeText(MainActivity.this,"录音文件为" + currentRecordFile.getAbsolutePath() ,Toast.LENGTH_LONG).show();
progressDialog.show();
Model.getInstance().getGlobalThreadPool().execute(new Runnable() {
@Override
public void run() {
MediaType MEDIA_TYPE_RECORD = okhttp3.MediaType.parse("application/octet-stream");
OkHttpClient client = new OkHttpClient();
client = new OkHttpClient.Builder()
.connectTimeout(300, TimeUnit.SECONDS)
.readTimeout(300, TimeUnit.SECONDS)
.build();
MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);
builder.addFormDataPart("username", userName);
Log.e("kk", "run: " + currentRecordFile);
File file = new File(currentRecordFile.getAbsolutePath());
builder.addFormDataPart("record", file.getName(), RequestBody.create(MEDIA_TYPE_RECORD, file));

                    MultipartBody requestBody = builder.build();

                    //构建请求
                    Request request = new okhttp3.Request.Builder()
                            .url(Const.UPLOAD_URL)//地址
                            .post(requestBody)//添加请求体
                            .build();

                    client.newCall(request).enqueue(new Callback() {
                        @Override
                        public void onFailure(Call call, IOException e) {
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    progressDialog.dismiss();
                                    Toast.makeText(MainActivity.this, "上传失败" + e.toString(), Toast.LENGTH_LONG).show();
                                }
                            });
                        }

                        @Override
                        public void onResponse(Call call, Response response) throws IOException {
                            String finishInfo = response.body().string();
                            if (!TextUtils.isEmpty(finishInfo)) {
                                if (finishInfo.contains("finish")) {
                                    runOnUiThread(new Runnable() {
                                        @Override
                                        public void run() {
                                            progressDialog.dismiss();
                                            Toast.makeText(MainActivity.this, "上传成功", Toast.LENGTH_SHORT).show();
                                            Intent intent = new Intent(MainActivity.this, MainActivity.class);
                                            startActivity(intent);
                                        }
                                    });
                                }
                            }
                        }
                    });
                }
            });

是这里报错不？

没那么多人有空看你代码逻辑，
扔报错