Question

可以向我解释我应该如何解释用户许可

我使用Camera2API，我实现了这样的代码片段，以恐怖的方式询问permishion

private void openCamera(int width, int height) {
    setUpCameraOutputs(width, height);
    CameraHelper.configureTransform(width, height, textureView, previewSize, getActivity());
    CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);

    try {
        if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
            throw new RuntimeException("Time out waiting to lock camera opening.");
        }

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) !=
                PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {

                // Show an explanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.

            } else {
                // No explanation needed, we can request the permission.

                ActivityCompat.requestPermissions(
                        getActivity(), new String[]{android.Manifest.permission.CAMERA},
                        MY_PERMISSIONS_REQUEST);

                // MY_PERMISSIONS_REQUEST is an
                // app-defined int constant. The callback method gets the
                // result of the request.
            }
        }

        manager.openCamera(mCameraId, mStateCallback, mBackgroundHandler);
    } catch (CameraAccessException e) {
        e.printStackTrace();
    } catch (InterruptedException e) {
        throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
    }
}

根据谷歌码头我应该检查用户是否拒绝许可

有返回false的方法

shouldShowRequestPermissionRationale();

并根据谷歌

如果应用先前已请求此权限且用户拒绝了该请求，则此方法返回true。

如果我根据谷歌评论在这个方法实现中正确理解

//向用户异步显示解释 - 不要阻止

//这个线程等待用户的回复！用户
之后
//查看解释，再次尝试请求权限。

最后例如用户拒绝我的许可之前和之后当他带着相机应用程序进入我的屏幕时应创建我的castom弹出窗口，并附上说明“如果你想继续，请同意这种情况”，例如用户同意这一次，我应该再次回想起这个方法

//查看解释，再次尝试请求权限。

但是这个方法

shouldShowRequestPermissionRationale();

再次回到我true，因为它不知道用户同意许可的意图。

请你解释一下如何正确地做到这一点？也许你有例子？

Answer 1

最终我在@nuuneoi的帮助下找到了解决方案，非常感谢！

并像这样实施

public void camera(View view) {
    toCamera();
}

private void toCamera() {
    if (!isCheckPermission()){
        return;
    }

    if (isProcessWasFinish()) {
        startActivity(new Intent(getApplicationContext(), CameraActivity.class));
        overridePendingTransition(R.anim.open_next, R.anim.close_main);
    } else {
        startActivity(new Intent(getApplicationContext(), UserDataScreen.class));
        overridePendingTransition(R.anim.open_next, R.anim.close_main);
    }
}

private boolean isCheckPermission() {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) !=
            PackageManager.PERMISSION_GRANTED) {

        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) {
            showMessageOKCancel("You need to allow access to Camera");
            return false;
        }

        // No explanation needed, we can request the permission.

        ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.CAMERA},
                MY_PERMISSIONS_REQUEST);
        return false;
        // MY_PERMISSIONS_REQUEST is an
        // app-defined int constant. The callback method gets the
        // result of the request.
    }

    return true;
}

private void showMessageOKCancel(String message) {
    new AlertDialog.Builder(MainActivity.this)
            .setMessage(message)
            .setPositiveButton("OK", listener)
            .setNegativeButton("Cancel", listener)
            .create()
            .show();
}

DialogInterface.OnClickListener listener = new DialogInterface.OnClickListener() {

    final int BUTTON_NEGATIVE = -2;
    final int BUTTON_POSITIVE = -1;

    @Override
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
            case BUTTON_NEGATIVE:
                // int which = -2
                dialog.dismiss();
                break;

            case BUTTON_POSITIVE:
                // int which = -1
                ActivityCompat.requestPermissions(
                        MainActivity.this, new String[]{android.Manifest.permission.CAMERA},
                        MY_PERMISSIONS_REQUEST);
                dialog.dismiss();
                break;
        }
    }
};

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                       @NonNull int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Log.e(MY_LOG, "Camera permission Granted");
                // permission was granted, yay! Do the
                // contacts-related task you need to do.

                toCamera();

            } else {
                Log.e(MY_LOG, "Camera permission Denied");
                // permission denied, boo! Disable the
                // functionality that depends on this permission.
            }
        }
        default: {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

Answer 2

嘿，您可以使用一些非常适合在应用启动时询问用户权限的库。

这是一个很棒的图书馆，可以帮助您在Android中实现这一目标：

Github link for the Permission dispatcher library

您可以找到权限调度程序库here

的用法示例

您还可以查看这些库：

App-Runtime-Permissions-Android

Assent

MarshmallowPermissionManager

棉花糖的权限和解释

2 个答案: