【Android报错】FileNotFoundException open failed:文件路径 EPERM (Operation not permitted)外部存储至根目录报错,Android外部存储权限动态获取问题

报错:FileNotFoundException open failed: XXXXXXX EPERM (Operation not permitted)

查了下,大概原因是因为权限的问题。(小白学Android,Android文档查起来还有点吃力,就直接谷歌+百度。)

但是Manifest里该加的权限都加了。还application增加了android:requestLegacyExternalStorage="true",表示没用。

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" tools:ignore="ProtectedPermissions" />

 

Android 6.0以后,Android对权限管理更严格了。试了几种解决办法,都不算我想要的。本意是想存储到SD卡的根路径下。

算了,先忽略了。继续往下学习吧。

 

解决:

自定义存储方法(原代码)

    public void saveIMG(){
        BufferedInputStream bis=null;
        BufferedOutputStream bos=null;
        try {
            //获取APP内存储路径,模拟器可行
//            ContextWrapper cw = new ContextWrapper(getApplicationContext());
//            File sdkPath = cw.getExternalFilesDir(Environment.DIRECTORY_PICTURES);

            //获取public存储路径,模拟器可行。真机需要动态权限
//            File sdkPath=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
            
            //获取根路径,不可行。增加动态获取外部存储读取权限后,真机运行,可行。
            File sdkPath=Environment.getExternalStorageDirectory();

            Log.v("hehe","sdkPath:"+sdkPath.getPath());
            file =new File(sdkPath,"test.jpeg");
            //读取图片
            @SuppressLint("ResourceType") InputStream is= getResources().openRawResource(R.drawable.kelala);
            //存储图片
            OutputStream io=new FileOutputStream(file);

            bis=new BufferedInputStream(is);
            bos=new BufferedOutputStream(io);

            int len=0;
            byte[] buf=new byte[1024];
            while ((len=bis.read(buf))!=-1){

                bos.write(buf,0,len);
                bos.flush();
            }
            Log.v("hehe","读取和存储buffer");
            Toast.makeText(OutStore.this,"存储成功!!!!!",Toast.LENGTH_LONG).show();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            if (bis!=null){
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (bos!=null){
                try {
                    bos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }


    }

调用自定义存储方法的Activity里增加外部存储动态权限获取的代码:

//需要动态授外部存储权限。模拟器不弹动态权限授权对话框,晚点看下什么问题吧
        int REQUEST_EXTERNAL_STORAGE = 1;
        String[] PERMISSIONS_STORAGE = {"android.permission.READ_EXTERNAL_STORAGE","android.permission.WRITE_EXTERNAL_STORAGE" };
        ActivityCompat.requestPermissions(this, PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE);

 

posted @ 2021-02-24 09:00  BossLearnCoding  阅读(8557)  评论(0编辑  收藏  举报