Question

我正在尝试使用以下代码将图像保存在公共存储目录中。但是，当这是保存到存储/模拟/ 0而不是公共图片文件夹。我已经在另一个应用程序中使用了基本上这个确切的代码，它运行良好。有谁知道为什么.getExternalStoragePublic目录没有返回accessible / Pictures /而是返回storage / emulated / 0？

我的清单文件中有“uses-permission android：name =”android.permission.WRITE_EXTERNAL_STORAGE“

File backupFile;
File appFolder;
String path= Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath() + "/CustomFolder";
appFolder = new File(path);
if (!appFolder.exists())
    appFolder.mkdir();
String fileName = "picture.jpg"
backupFile = new File(appFolder, fileName);
FileOutputStream output = null;
try {
    output = new FileOutputStream(backupFile);
    output.write(bytes);
} catch (IOException e) {
    e.printStackTrace();
} finally {
    mImage.close();
    if (null != output) {
        try {
            output.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 1

没关系，我明白了。事实证明只有＆＃34;使用权限android：name =＆＃34; android.permission.WRITE_EXTERNAL_STORAGE＆＃34;在Manifest文件中是不够的，我必须在它之前放置以下代码才能使它工作：

    int CAMERA_PERMISSION_REQUEST_CODE = 2;
    int result = ContextCompat.checkSelfPermission(getActivity().getApplicationContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (result != PackageManager.PERMISSION_GRANTED){
        if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE)){
            Toast.makeText(getActivity().getApplicationContext(), "External Storage permission needed. Please allow in App Settings for additional functionality.", Toast.LENGTH_LONG).show();
        } else {
            ActivityCompat.requestPermissions(getActivity(),new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},CAMERA_PERMISSION_REQUEST_CODE);
        }
    }

Android - 避免保存到存储/模拟/ 0

1 个答案: