/storage/emulated/0/bluetooth/Screenshot.competeordersb.png: open failed: EACCES (Permission denied)

这种问题一看就是权限问题，解决办法如下：1，查看AndroidManifest.xml文件中是否添加静态读写权限。<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />2，6.0以上系统，查看在进行读写操作时是否动态申请读写权限void getPermission(){try{//需要的权

菜鸟xiaowang

2683人浏览 · 2021-12-21 20:50:03

菜鸟xiaowang · 2021-12-21 20:50:03 发布

这种问题一看就是权限问题，解决办法如下：

1，查看AndroidManifest.xml文件中是否添加静态读写权限。

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2，6.0以上系统，查看在进行读写操作时是否动态申请读写权限

 void getPermission(){
        try{
            //需要的权限
            String[] permArr={
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.MOUNT_UNMOUNT_FILESYSTEMS,
            };
            boolean needReq = false;
            for(int i=0;i<permArr.length;i++){
                if(ContextCompat.checkSelfPermission(this, permArr[i])!= PackageManager.PERMISSION_GRANTED){
                    needReq = true;
                    break;
                }
            }
            if(needReq)
                ActivityCompat.requestPermissions(this,permArr,1);
        }catch (Exception e){
            Log.w("动态申请权限时，发生异常。",e);
        }

3，10.0以上系统，在AndroidManifest.xml文件的application节点下添加

android:requestLegacyExternalStorage="true"

4.Android 11+

android:requestLegacyExternalStorage="true" 失效如果需要使用公共存储，需要系统签名+

android:sharedUserId="android.uid.system"

我们可以通过Context的getExternalFilesDir(null)方法获取APP专属目录,例如:/storage/emulated/0/Android/data/com.example.myapplication/files如果需要把图片保存到系统相册里可以参考下面代码：

val bitmap = BitmapFactory.decodeResource(resources, R.drawable.image_03)
val values = ContentValues();
values.put(	MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES + File.separator + "MyApplication"); //在图库里显示的文件夹名：MyApplication
values.put(MediaStore.MediaColumns.DISPLAY_NAME, "test");
values.put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg");
values.put(MediaStore.MediaColumns.DATE_ADDED, System.currentTimeMillis() / 1000);
values.put(MediaStore.MediaColumns.DATE_MODIFIED, System.currentTimeMillis() / 1000);
values.put(MediaStore.MediaColumns.IS_PENDING, 1);
val resolver = contentResolver;
val uri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
val out = resolver.openOutputStream(uri!!)
bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out)
values.clear()
values.put(MediaStore.MediaColumns.IS_PENDING, 0)
values.putNull(MediaStore.MediaColumns.DATE_EXPIRES)
resolver.update(uri, values, null, null)

Android 11 获取存储路径错误 android.system.ErrnoException: open failed: EPERM (Operation not permitted)，Android11 不能获取sdcard通用空间路径。

private String getSavePath() {
        String path;
        if (Build.VERSION.SDK_INT > 29) {
            path = mContext.getExternalFilesDir(null).getAbsolutePath() + "/log/update/";
        } else {
            path = Environment.getExternalStorageDirectory().getPath() + "/log/update/";
        }
        return path;
    }
获取的空间路径为 Android/data/XXXX(应用包名)/log

<!-- Allows an application a broad access to external storage in scoped storage.
         Intended to be used by few apps that need to manage files on behalf of the users.
         <p>Protection level: signature|appop|preinstalled -->
    <permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"
        android:permissionGroup="android.permission-group.UNDEFINED"
        android:protectionLevel="signature|appop|preinstalled" />

Android 11 中的存储机制更新 | Android 开发者 | Android Developers

(343条消息) WRITE_EXTERNAL_STORAGE no longer provides write access when targeting Android 10+_苏坡Man*_*的博客-CSDN博客

java - requestLegacyExternalStorage is not working in Android 11 - API 30 - Stack Overflow