I need to save some data to SD card , I have add the permission to AndroidManifest.xml file, and I can get the correct result when I test it in Android 4.12 mobile.
But I get open failed: EACCES (Permission denied) error when I test it in Android 5.1 mobile, why?
BTW, I have read the artical Android 6.0 open failed: EACCES (Permission denied) and Exception 'open failed: EACCES (Permission denied)' on Android , but now my mobile is SamSung Android 5.1
Code
private void ActionUploadFiles(Map<String, String> files,IHTTPSession session,String uploadFolder){ try{ Set<String> keys = files.keySet(); for (String key:keys) { String location = files.get(key); File source = new File(location); String filename= session.getParms().get(key); filename=FilenameUtils.getName(filename); File target = new File(uploadFolder,filename); FileUtils.copyFile(source,target); } } catch (Exception e) { Utility.LogError("Upload Error: "+ e.getMessage()); } } AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="info.dodata.wifi"> <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> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="com.android.vending.BILLING" /> build.gradle
apply plugin: 'com.android.application' android { compileSdkVersion 23 buildToolsVersion "23.0.3" defaultConfig { multiDexEnabled true applicationId "info.dodata.wifi" minSdkVersion 16 targetSdkVersion 23 versionCode 4 versionName "1.04" archivesBaseName = "WiFiFileTransfer-V" + versionName } productFlavors { free { applicationId "info.dodata.wifi" } pro { applicationId "info.dodata.wifi.pro" } } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' buildConfigField "boolean", "IsDebugMode", "false" } debug { buildConfigField "boolean", "IsDebugMode", "true" } } } 3 Answers
Answers 1
You are missing the run-time permissions introduced from Android Lollipop. What you can do is enable permission. To do this, go to
Settings -> Apps -> YOUR_APP -> Permissions
and enable permissions and then test it.
For adding run-time permission, you can ask inside onCreate().
String[] permission ={Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}; if(ContextCompat.checkSelfPermission(EditDisplayPicture.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(EditDisplayPicture.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { ActivityCompat.requestPermissions(YourActivity.this, permission, 1); } } else proceedFurther(); And then listen for permission acceptance or denial like this,
@Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { proceedFurther(); } else { Toast.makeText(YourActivity.this, "You need to give permission in order to proceed further.", Toast.LENGTH_SHORT).show(); } } Answers 2
because you have targetSdkVersion 23 thats why you get Security exception, you have to downgrade to targetSdkVersion 22 or add run time permission. please check this link https://developer.android.com/training/permissions/requesting.html
Answers 3
Starting Kitkat, Android restricted write access to SDCARD to third party applications. They introduced the Storage Access Framework for performing the operations. To write to files on the SDCard you will need to use these API's.
For Some devices running Lollipop, you can gain write access to files using these api's. As I haven't used the api myself, I cannot provide you with a snippet. But the link will surely help you solve the problem.
You can take a look at Es Explorer to see the flow of how they handle this scenario.
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