Question

经过三天的搜索，我意识到android 6还是改变了权限。但我没有要求oermisiunea保存文件。我可能是groza的例子，但事实并非如此，我做错了什么。请帮忙。

    String url = "http://grupovrt.ddns.net:81/v4.2.apk";
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
        request.setDescription("Virtual Romania Tv UPDATE");
        request.setTitle("UPDATE Virtual Romania Tv");
// in order for this if to run, you must use the android 3.2 to compile your app
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

        }
        if (!checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE,
                R.string.title_activity_categori))
        {
            Toast.makeText(getBaseContext(), "Not allowed to save files", Toast.LENGTH_SHORT).show();
        } else {

            // try to save the file

            request.setDestinationInExternalPublicDir("/update", "v4.2.apk");

        }


// get download service and enqueue file
        DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
        manager.enqueue(request);

错误：错误：（108,49）错误：找不到符号变量WRITE_EXTERNAL_STORAGE

编辑。

如果获得写作许可，我确实寻求过。但如果不是，我不知道如何征求许可。请帮助我，我尝试了我在谷歌上找到的所有东西，但不能。我是初学者。

 if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
            == PackageManager.PERMISSION_GRANTED) {

            Toast.makeText(getBaseContext(), "Descarc noi actualizari!", Toast.LENGTH_SHORT).show();



            String url = "http://grupovrt.ddns.net:81/v4.2.apk";
            DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
            request.setDescription("Virtual Romania Tv UPDATE");
            request.setTitle("UPDATE Virtual Romania Tv");

            // in order for this if to run, you must use the android 3.2 to compile your app

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                // get download service and enqueue file
                DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
                manager.enqueue(request);


                Toast.makeText(getBaseContext(), "Descarc noi actualizari!", Toast.LENGTH_SHORT).show();

            }


            request.setDestinationInExternalPublicDir("/update", "v4.2.apk");
        }else {
            Toast.makeText(getBaseContext(), "Nu ai permisiunea sa descarci!", Toast.LENGTH_SHORT).show();

        }

Answer 1

这对我有用：

    int permissionCheck = ContextCompat.checkSelfPermission(context, android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
    if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(context, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            Toast.makeText(context, "Trebuie sa oferi acces la spatiul de stocare!", Toast.LENGTH_SHORT).show();
            ActivityCompat.requestPermissions(context, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, 110);
            ActivityCompat.requestPermissions(context, new String[]{android.Manifest.permission.RECORD_AUDIO}, 110);
        } else {
            Toast.makeText(context, "Descarc noi actualizari!", Toast.LENGTH_SHORT).show();
        }
    }

Answer 2

为了简化代码，我建议您使用下一个代码：

创建OnPermissionRequested接口：

public interface OnPermissionRequested {
    void onGranted();
}

在活动/片段中添加下一个检查权限的方法。您还可以创建主要活动和片段并进行扩展以避免重复的代码：

OnPermissionRequested mPermissionRequest;

protected void requestPermission(String permission, OnPermissionRequested listener) {

    mPermissionRequest = listener;

    // Here, thisActivity is the current activity
    if (ContextCompat.checkSelfPermission(this, permission)
            != PackageManager.PERMISSION_GRANTED) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
            Toast.makeText(this, "Permission denied, try again later please.", Toast.LENGTH_SHORT).show();
        } else {
            // request the permission.
            ActivityCompat.requestPermissions(this,
                    new String[]{permission}, 2456);
        }
    } else {
        mPermissionRequest.onGranted();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                   String permissions[], int[] grantResults) {
    if (grantResults.length > 0
        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
        if (mPermissionRequest != null)
            mPermissionRequest.onGranted();
    }
}

调用requestPermission方法，您需要检查权限，并在授予权限时使用您要执行的操作设置第二个参数。

requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, 
    new OnPermissionRequested() {
        @Override
        public void onGranted() {
            // what you want to do
            createPdf();
        }
    });

我希望你觉得它很有用。祝你好运

Android Marshmallow requestPermissions WRITE_EXTERNAL_STORAGE

2 个答案: