打开失败:第一次运行时EACCES(权限被拒绝)

时间:2018-08-22 14:39:08

标签: android permissions android-6.0.1-marshmallow

在请求运行时的所有权限后,我试图将文件写入/读取到外部存储中。

清单:

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

运行时:

Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE.

JavaCode:

    public class FilesUtil {

    public static String saveImageToFile(Bitmap image ,String employeeId){
        String root = Environment.getExternalStorageDirectory().toString();
        File myDir = new File(root + "/AppName");
        myDir.mkdirs();
        String filename = String.format("EMPLOYEE_%s.png", employeeId);
        File file = new File (myDir, filename);
        if (file.exists()){
            file.delete(); // here i'm checking if file exists and if yes then i'm deleting it but its not working
        }

        FileOutputStream out = null;
        try {
            out = new FileOutputStream(file,false);
            image.compress(Bitmap.CompressFormat.PNG, 100, out);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return filename;
    }

    public static String getImagePath(String employeeId){
        String result  = Environment.getExternalStorageDirectory().toString() + "/AppName/";
        String filename = String.format("EMPLOYEE_%s.png", employeeId);
        return result + filename;
    }
}

加载文件:

private Bitmap getCurrentPhoto() {
    File image = new File(FilesUtil.getImagePath(getCurrentEmployeeId()));
    BitmapFactory.Options bmOptions = new BitmapFactory.Options();
    Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(), bmOptions);
    return bitmap;
}

我第一次运行该应用程序时,打开失败:仅在Android 6.0.1上运行EACCES(权限被拒绝),但是,在其他版本的Operative系统中,该功能运行正常。如果我在6.0.1上杀死并重新打开该应用程序,则该功能运行正常。

1 个答案:

答案 0 :(得分:0)

Android 6.0上存在一个错误,直到所有应用程序进程都被杀死,该权限才被应用。在其他版本的操作系统中,如果权限设置发生更改,则该应用会自动被杀死,并从上一个活动中重新启动。

我避免在onRequestPermissionsResult上使用此错误并重新启动应用。

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (grantResults.length == permissions.length){
        if (android.os.Build.VERSION.SDK_INT == Build.VERSION_CODES.M) {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setMessage(R.string.restart_message)
                    .setPositiveButton(R.string.restart_button, (dialog, id) -> {
                        restartApp();
                    });
            builder.create().show();
        }
    }
}