Question

我在将文件写入SD卡时遇到问题。（我使用的是Android 5.1 sdk 23版）。

我甚至尝试过以下代码，提示用户选择用户，在那里我选择＆＃34; Sd卡＆＃34;并保留权限。 Manifest也有写权限。

的AndroidManifest.xml

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

public writeToFile() {
            String filePath = "/storage/sdcard1/FileBrowser/Music";
            File file = new File(filePath);
            File parentDir = file.getParentFile();
            if (parentDir != null) {
                Log.d(TAG, parentDir.toString());
                Log.d(TAG, file.getName());
                File newFile = new File(parentDir + "/test.txt");
                try {
                    BufferedWriter writer = new BufferedWriter(new FileWriter(newFile));
                    writer.write("Hello", 0, "Hello".length());
                    writer.flush();
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } else {
                Log.d(TAG, "Parent file is null");
            }
   }


private void takeWritePermission() {
        if(Build.VERSION.SDK_INT > 19) {
            List<UriPermission> permissionList = getActivity().getContentResolver().getPersistedUriPermissions();
            if (permissionList != null) {
                UriPermission permission = permissionList.get(0);
                if (permission == null) {
                    startPermissionActivity();
                } else {
                    if (permission.isWritePermission()) {
                        writeToFile();
                    } else {
                        startPermissionActivity();
                    }
                }
            } else {
                startPermissionActivity();
            }
        }
    }

private void startPermissionActivity() {
            Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
            startActivityForResult(intent, 42);
    }

    public void onActivityResult(int requestCode, int resultCode, Intent resultData) {

        if(Build.VERSION.SDK_INT > 19) {
            if (resultCode == AppCompatActivity.RESULT_OK) {
                Uri treeUri = resultData.getData();
                getActivity().getContentResolver().takePersistableUriPermission(treeUri,
                        Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                writeToFile();
            }
        }
    }

> Exception: java.io.FileNotFoundException:
> /storage/sdcard1/FileBrowser/Music/test.txt: open failed: EACCES
> (Permission denied)  at libcore.io.IoBridge.open(IoBridge.java:456) 
> at java.io.FileOutputStream.<init>(FileOutputStream.java:87)  at
> java.io.FileOutputStream.<init>(FileOutputStream.java:72)  at
> java.io.FileWriter.<init>(FileWriter.java:42)

android EACCES（权限被拒绝）

0 个答案: