Android-拒绝创建新文件的权限

我试图在Android中创建一个文件,甚至在遵循所有其他答案之后,我仍然无法获得许可. saveImage()方法中发生错误.

 // STATICS
 private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
            Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE
    };

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState)
        verifyStoragePermissions(this);
    }

  //HERE IS THE METHOD THAT ASKS FOR PERMISSIONS
    public static void verifyStoragePermissions(Activity activity) {
        // Check if we have write permission
        int permission = ActivityCompat.checkSelfPermission(activity,Manifest.permission.WRITE_EXTERNAL_STORAGE);

        if (permission != PackageManager.PERMISSION_GRANTED) {
            // We don't have permission so prompt the user
            ActivityCompat.requestPermissions(
                    activity,PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE
            );
        }
    }

  @Override //ON REQUEST PERMISSION RESULT,//I ACCEPTED THE PERMISSION,THE CODE HERE WAS EXECUTED AS IT SHOULD
    public void onRequestPermissionsResult(int requestCode,String permissions[],int[] grantResults) {
        switch (requestCode) {

            case 1: {
                Log.d(TAG,"THIS IS FOR THE WRITE/READ PERMISSIONS");
                Log.d(TAG,grantResults.toString());
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.d(TAG,"[Persmission accepted for writing/reading]");


                    // permission was granted,yay! Do the
                    // camera related task you need to do.
                } else {
                    Log.d(TAG,"[Permission denied]");
                    // permission denied,boo! disable the
                    // functionality that depends on this permission.
                }

            }

            // other 'case' lines to check for other
            // permissions this app might request.
        }
    }

 //THE METHOD WHERE THE ERROR HAPPENS
 public String saveImage(Bitmap myBitmap) {

        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        myBitmap.compress(Bitmap.CompressFormat.JPEG,90,bytes);

        File wallpaperDirectory = new File(
                Environment.getExternalStorageDirectory() + "TEST_APP_PHOTO_FOLDER");

        // have the object build the directory structure,if needed.
        if (!wallpaperDirectory.exists()) {

            wallpaperDirectory.mkdirs();
        }

        try {

            File f = new File(wallpaperDirectory + "testfile.jpg");

            f.mkdirs();
          f.createNewFile(); // <--- STACK TRACE POINTS HERE

            FileOutputStream fo = new FileOutputStream(f);
..
..
..

该错误发生在saveImage()方法中.我有评论解释发生的地方.我已经尝试过使用f.mkdirs()的方法,但是如果没有它,则将无法正常工作.权限两次均被拒绝.

堆栈跟踪

java.io.IOException: Permission denied
        at java.io.UnixFileSystem.createFileExclusively0(Native Method)
        at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:281)
        at java.io.File.createNewFile(File.java:1000)
        at car.andrej.Tradingapp.ProfileActivity.ProfileActivity.saveImage(ProfileActivity.java:263)
        at car.andrej.Tradingapp.ProfileActivity.ProfileActivity.onActivityResult(ProfileActivity.java:220)
        at android.app.Activity.dispatchActivityResult(Activity.java:7556)
        at android.app.ActivityThread.deliverResults(ActivityThread.java:4487)
        at android.app.ActivityThread.handleSendResult(ActivityThread.java:4534)
        at android.app.ActivityThread.-wrap20(UnkNown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1752)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6944)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

在清单中：

 <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

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

我想念什么？…

最佳答案

这不是Android权限问题.相反,该异常是由于Linux权限造成的,尽管是无意间造成的.

实例化saveImage()中使用的文件时,您要将新文件/目录的名称连接到Environment.getExternalStorageDirectory();.例如,对于wallpaperDirectory：

new File(Environment.getExternalStorageDirectory() + "TEST_APP_PHOTO_FOLDER")

这是在Environment.getExternalStorageDirectory()上隐式调用toString()并直接在其后附加名称,而无需使用必需的路径分隔符,因此最终得到的全名类似于/ storage / emulated / 0TEST_APP_PHOTO_FOLDER.这是指外部存储目录的父目录中的文件,并且您在那里没有写访问权,因此是Exception.

只需更改您的File实例以使用带有单独File和String参数的构造函数；第一个用于父目录,第二个用于名称.基本上,将加号更改为逗号.例如：

new File(Environment.getExternalStorageDirectory(),"TEST_APP_PHOTO_FOLDER")

原文地址：https://www.jb51.cc/android/531372.html

Android-拒绝创建新文件的权限

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