android - 如何在 Flutter 插件中请求权限？

Question

我正在尝试使用一个简单的 Flutter 插件(语音识别包装器)，但不知道如何在 Android 23 或更高版本上请求适当的权限。在 Dart 部分我有:

  Future requestPermissions() => 
  _channel.invokeMethod("speech.requestPermissions");

在安卓部分:

  public class SpeechRecognitionPlugin implements MethodCallHandler, RecognitionListener,
    PluginRegistry.RequestPermissionResultListener {

插件注册:

  public static void registerWith(Registrar registrar) {
    final MethodChannel channel = new MethodChannel(registrar.messenger(), "speech_recognition");
    SpeechRecognitionPlugin speechRecognitionPlugin = new 
    SpeechRecognitionPlugin(registrar.activity(), channel);
    channel.setMethodCallHandler(speechRecognitionPlugin);
    registrar.addRequestPermissionResultListener(speechRecognitionPlugin);
  }

方法调用:

else if (call.method.equals("speech.requestPermissions")) {
        Log.d(LOG_TAG, "speech.requestPermissions");
        if (ActivityCompat.shouldShowRequestPermissionRationale(activity,
                Manifest.permission.RECORD_AUDIO)) {
            Toast.makeText(activity.getApplicationContext(), "This application needs the Record Audio permission for recognition to work", Toast.LENGTH_LONG).show();
        } else {
            Log.d(LOG_TAG, "Requesting permissions");
            ActivityCompat.requestPermissions(activity,
                    new String[]{Manifest.permission.RECORD_AUDIO},
                    1);
        }
        result.success(hasRecordAudioPermission());

结果回调:

@Override                                                                                            
public boolean onRequestPermissionResult(int requestCode, String[] permissions, int[] grantResults) {
    boolean granted = false;
    switch (requestCode) {
        case 1: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                granted = true;
            }
            speechChannel.invokeMethod("speech.onPermission", granted);
            return true;
        }
    }
    return false;
}

从 logcat 我看到发生了“speech.requestPermissions”调用，但是没有显示标准的 Android 系统权限请求，只是 logcat 中的这个可能是相关的:

D/ViewRootImpl(21171): #1 mView = android.widget.LinearLayout{64f050b 
V.E...... ......I. 0,0-0,0 #102039d android:id/toast_layout_root}
D/ViewRootImpl(21171): MSG_RESIZED_REPORT: ci=Rect(0, 0 - 0, 0) vi=Rect(0, 0 - 0, 0) or=1
D/ViewRootImpl(21171): #3 mView = null

Flutter 插件请求权限的正确方式是什么？

编辑:这不适用于对话框正确显示时的第一次运行，但适用于用户最初未授予权限或通过设置撤销权限时的后续运行。我意识到这会显着改变问题(使其显示为边缘案例)，但 Android 权限不应该以这种方式工作。

编辑:权限存在于 AndroidManifest.xml 中

Answer 1

使用Permission plugin for flutter

请求许可

import 'package:permissions_plugin/permissions_plugin.dart';

Map<Permission, PermissionState> permission = await PermissionsPlugin
    .requestPermissions([
        Permission.ACCESS_FINE_LOCATION,
        Permission.ACCESS_COARSE_LOCATION,
        Permission.READ_PHONE_STATE
    ]);

检查状态权限

import 'package:permissions_plugin/permissions_plugin.dart';

Map<Permission, PermissionState> permission = await PermissionsPlugin
    .checkPermissions([
      Permission.ACCESS_FINE_LOCATION,
      Permission.ACCESS_COARSE_LOCATION,
      Permission.READ_PHONE_STATE
    ]);