向同一活动中的两个不同函数请求 WRITE_EXTERNAL_STORAGE 权限

Question

我有两个不同的功能用于 takeScreenshot 和 saveAsPDF，它们都需要 WRITE_EXTERNAL_STORAGE 权限。但是我怎样才能在onRequestPermissionsResult 中为同一个Activity 中的相同权限创建一个switch case，因为requestCode 在这两种情况下都是相同的。

Answer 1

你可以像下面这样创建单独的类来检查和询问权限 ->

public class PermissionCheck {

    private static final String TAG = PermissionCheck.class.getSimpleName();

    private Context context;
    private static final int EXTERNAL_WRITE_PERMISSION_CODE = 620;
    private static final int CAMERA_PERMISSION_CODE = 335;

    public PermissionCheck(Context context) {
        this.context = context;
    }

    //  Check Required Permissions...
    public boolean CheckRequestedPermission(Context context, String CheckRequiredPermission) {
        return ContextCompat.checkSelfPermission(context, CheckRequiredPermission) == PackageManager.PERMISSION_GRANTED;
    }

    //  To Request Permission...
    private void requestPermission(final Context context, final String RequestedPermission, final int PermissionCode) {
        if (!CheckRequestedPermission(context, RequestedPermission)) {
            ActivityCompat.requestPermissions((Activity) context, new String[]{RequestedPermission}, PermissionCode);
        }
    }


    //  Just add Permission Code that you required to get permissions and call this method...
    public void AskPermission(int RequestCode) {
        switch (RequestCode) {
            case EXTERNAL_WRITE_PERMISSION_CODE:
                requestPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE, EXTERNAL_WRITE_PERMISSION_CODE);
                break;
            case CAMERA_PERMISSION_CODE:
                requestPermission(context, Manifest.permission.CAMERA, CAMERA_PERMISSION_CODE);
                break;
        }
    }
}

并询问您想要的任何权限，并在 Activity 或片段中实现 OnRequestPermissionResult，如下所示。

@Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case EXTERNAL_WRITE_PERMISSION_CODE:
                Log.d(TAG, "onPermissionResult : Permission Granted? " + IsExternalWritePermissionGranted);
                //  changing value based on permission Deny/Accept
                IsExternalWritePermissionGranted = permissionCheck.CheckRequestedPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
                break;
            case CAMERA_PERMISSION:
                //  changing value based on permission Deny/Accept
                IsCameraPermissionGranted = permissionCheck.CheckRequestedPermission(this, Manifest.permission.CAMERA);
                break;
        }
    }

请注意，您从活动/片段传递给 PermissionCheck 的权限代码应该与 PermissionCheck 类中的相同。