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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:meta/meta.dart';
import 'package:platform/platform.dart';
const String _kChannelName = 'plugins.flutter.io/android_intent';
/// Flutter plugin for launching arbitrary Android Intents.
///
/// See [the official Android
/// documentation](https://developer.android.com/reference/android/content/Intent.html)
/// for more information on how to use Intents.
class AndroidIntent {
/// Builds an Android intent with the following parameters
/// [action] refers to the action parameter of the intent.
/// [flags] is the list of int that will be converted to native flags.
/// [category] refers to the category of the intent, can be null.
/// [data] refers to the string format of the URI that will be passed to
/// intent.
/// [arguments] is the map that will be converted into an extras bundle and
/// passed to the intent.
/// [package] refers to the package parameter of the intent, can be null.
/// [componentName] refers to the component name of the intent, can be null.
/// If not null, then [package] but also be provided.
/// [type] refers to the type of the intent, can be null.
const AndroidIntent({
this.action,
this.flags,
this.category,
this.data,
this.arguments,
this.package,
this.componentName,
Platform platform,
this.type,
}) : assert(action != null || componentName != null,
'action or component (or both) must be specified'),
_channel = const MethodChannel(_kChannelName),
_platform = platform ?? const LocalPlatform();
/// This constructor is only exposed for unit testing. Do not rely on this in
/// app code, it may break without warning.
@visibleForTesting
AndroidIntent.private({
@required Platform platform,
@required MethodChannel channel,
this.action,
this.flags,
this.category,
this.data,
this.arguments,
this.package,
this.componentName,
this.type,
}) : assert(action != null || componentName != null,
'action or component (or both) must be specified'),
_channel = channel,
_platform = platform;
/// This is the general verb that the intent should attempt to do. This
/// includes constants like `ACTION_VIEW`.
///
/// See https://developer.android.com/reference/android/content/Intent.html#intent-structure.
final String action;
/// Constants that can be set on an intent to tweak how it is finally handled.
/// Some of the constants are mirrored to Dart via [Flag].
///
/// See https://developer.android.com/reference/android/content/Intent.html#setFlags(int).
final List<int> flags;
/// An optional additional constant qualifying the given [action].
///
/// See https://developer.android.com/reference/android/content/Intent.html#intent-structure.
final String category;
/// The Uri that the [action] is pointed towards.
///
/// See https://developer.android.com/reference/android/content/Intent.html#intent-structure.
final String data;
/// The equivalent of `extras`, a generic `Bundle` of data that the Intent can
/// carry. This is a slot for extraneous data that the listener may use.
///
/// See https://developer.android.com/reference/android/content/Intent.html#intent-structure.
final Map<String, dynamic> arguments;
/// Sets the [data] to only resolve within this given package.
///
/// See https://developer.android.com/reference/android/content/Intent.html#setPackage(java.lang.String).
final String package;
/// Set the exact `ComponentName` that should handle the intent. If this is
/// set [package] should also be non-null.
///
/// See https://developer.android.com/reference/android/content/Intent.html#setComponent(android.content.ComponentName).
final String componentName;
final MethodChannel _channel;
final Platform _platform;
/// Set an explicit MIME data type.
///
/// See https://developer.android.com/reference/android/content/Intent.html#intent-structure.
final String type;
bool _isPowerOfTwo(int x) {
/* First x in the below expression is for the case when x is 0 */
return x != 0 && ((x & (x - 1)) == 0);
}
/// This method is just visible for unit testing and should not be relied on.
/// Its method signature may change at any time.
@visibleForTesting
int convertFlags(List<int> flags) {
int finalValue = 0;
for (int i = 0; i < flags.length; i++) {
if (!_isPowerOfTwo(flags[i])) {
throw ArgumentError.value(flags[i], 'flag\'s value must be power of 2');
}
finalValue |= flags[i];
}
return finalValue;
}
/// Launch the intent.
///
/// This works only on Android platforms.
Future<void> launch() async {
if (!_platform.isAndroid) {
return;
}
await _channel.invokeMethod<void>('launch', _buildArguments());
}
/// Check whether the intent can be resolved to an activity.
///
/// This works only on Android platforms.
Future<bool> canResolveActivity() async {
if (!_platform.isAndroid) {
return false;
}
return await _channel.invokeMethod<bool>(
'canResolveActivity',
_buildArguments(),
);
}
/// Constructs the map of arguments which is passed to the plugin.
Map<String, dynamic> _buildArguments() {
return {
if (action != null) 'action': action,
if (flags != null) 'flags': convertFlags(flags),
if (category != null) 'category': category,
if (data != null) 'data': data,
if (arguments != null) 'arguments': arguments,
if (package != null) ...{
'package': package,
if (componentName != null) 'componentName': componentName,
},
if (type != null) 'type': type,
};
}
}