flutter_android

Description:

flutter android

Flutter Android Bindings #




This is a Flutter plugin for using Android's
numerous platform-specific APIs in Flutter apps.
Prerequisites #

Dart 2.8+ and Flutter 1.17+

Compatibility #
Android only.
Installation #
dependencies:
flutter_android: ^0.8.0
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Features #


Implements bindings to a growing set of Android's platform-specific APIs.


Reduces duplication of effort by centralizing Android bindings in a single package.


Feature Table #



Feature
Flutter API




Activity launch
android_content.Intent#startActivity()


Bluetooth scanning
android_bluetooth.BluetoothLeScanner


Distance calculation
android_location.Location.distanceBetween()


Face detection
android_media.FaceDetector


Heart-rate monitoring
android_hardware.SensorManager.getDefaultSensor()


Parcel serialization
android_os.Parcel


Sensor event streams
android_hardware.Sensor#subscribe()



Examples #
Activity launch #
import 'package:flutter_android/android_content.dart' show Intent;

await Intent(
action: "android.intent.action.VIEW", // Intent.ACTION_VIEW
data: Uri.parse("https://flutter.dev"),
).startActivity();
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Parcel serialization #
import 'package:flutter_android/android_os.dart' show Parcel;

var parcel = Parcel.obtain()
..writeBoolean(true)
..writeInt(42)
..writeDouble(3.1415)
..writeString("Hello, world!")
..writeList(<Object>[1, 2, 3])
..writeMap(<String, Object>{"a": 1, "b": 2, "c": 3});

await _channel.invokeMethod('someJavaMethod', parcel.asUint8List());

// In Java, your MethodCallHandler's call.arguments contains the marshaled Parcel
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Face detection #
import 'package:flutter_android/android_graphics.dart' show Bitmap;
import 'package:flutter_android/android_media.dart' show Face, FaceDetector;

var photo = Image.asset("images/einstein.png");

var bitmap = Bitmap.fromAssetImage(photo.image as AssetImage);
var detector = FaceDetector(width: 280, height: 396);

for (var face in await detector.findFaces(bitmap)) {
if (face.confidence < Face.CONFIDENCE_THRESHOLD) {
continue; // skip dubious results below the cut-off threshold
}
print("Found a face at (${face.midPoint.x}, ${face.midPoint.y}) with confidence ${face.confidence}");
}
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Heart-rate monitoring #
import 'package:flutter_android/android_hardware.dart'
show Sensor, SensorEvent, SensorManager;

var sensor = await SensorManager.getDefaultSensor(Sensor.TYPE_HEART_RATE);

var events = await sensor.subscribe();
events.listen((SensorEvent event) {
print(event.values[0]);
});
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Frequently Asked Questions #
TODO
Caveats #

iOS is not and cannot be supported.
All flutter_android APIs throw an AssertionError if they are invoked
when running on iOS. For cross-platform apps, we recommend that you depend
on the platform package to
conditionalize your use of Android APIs.

Reference #
android #
import 'package:flutter_android/android.dart' as android;
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android_app #
import 'package:flutter_android/android_app.dart' as android_app;
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Notification
NotificationAction
WallpaperColors

android_bluetooth #
import 'package:flutter_android/android_bluetooth.dart' as android_bluetooth;
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BluetoothAdapter
BluetoothDevice
BluetoothHeadset
BluetoothLeScanner
BluetoothManager

android_content #
import 'package:flutter_android/android_content.dart' as android_content;
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ComponentName
ContentValues
Context.cacheDir
Context.codeCacheDir
Context.dataDir
Context.externalCacheDir
Context.externalFilesDir
Context.filesDir
Context.getSharedPreferences()
Context.getSystemService()
Context.noBackupFilesDir
Context.packageCodePath
Context.packageName
Context.packageResourcePath
Intent
SharedPreferences

android_database #
import 'package:flutter_android/android_database.dart' as android_database;
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Cursor
DatabaseUtils
MatrixCursor

android_graphics #
import 'package:flutter_android/android_graphics.dart' as android_graphics;
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Bitmap
Point
PointF

android_hardware #
import 'package:flutter_android/android_hardware.dart' as android_hardware;
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Sensor
SensorEvent
SensorEventListener
SensorManager

android_location #
import 'package:flutter_android/android_location.dart' as android_location;
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Location

android_media #
import 'package:flutter_android/android_media.dart' as android_media;
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Face
FaceDetector

android_os #
import 'package:flutter_android/android_os.dart' as android_os;
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Bundle
Environment.dataDirectory
Environment.downloadCacheDirectory
Environment.externalStorageDirectory
Environment.externalStorageState
Environment.rootDirectory
Environment.isExternalStorageEmulated
Environment.isExternalStorageRemovable

Cross-Reference #



Android
Flutter




android.app
android_app


android.app.Activity
android_app.Activity


android.app.ActivityManager
android_app.ActivityManager


android.app.AlarmManager
android_app.AlarmManager


android.app.AuthenticationRequiredException
android_app.AuthenticationRequiredException


android.app.DownloadManager
android_app.DownloadManager


android.app.KeyguardManager
android_app.KeyguardManager


android.app.Notification
android_app.Notification


android.app.Notification.Action
android_app.NotificationAction


android.app.Notification.Builder
android_app.NotificationBuilder


android.app.NotificationManager
android_app.NotificationManager


android.app.PendingIntent
android_app.PendingIntent


android.app.SearchManager
android_app.SearchManager


android.app.WallpaperColors
android_app.WallpaperColors


android.app.WallpaperInfo
android_app.WallpaperInfo


android.app.WallpaperManager
android_app.WallpaperManager


android.bluetooth
android_bluetooth


android.bluetooth.BluetoothAdapter
android_bluetooth.BluetoothAdapter


android.bluetooth.BluetoothDevice
android_bluetooth.BluetoothDevice


android.bluetooth.BluetoothHeadset
android_bluetooth.BluetoothHeadset


android.bluetooth.BluetoothManager
android_bluetooth.BluetoothManager


android.bluetooth.le.BluetoothLeScanner
android_bluetooth.BluetoothLeScanner


android.bluetooth.le
android_bluetooth


android.content
android_content


android.content.ActivityNotFoundException
android_content.ActivityNotFoundException


android.content.ComponentName
android_content.ComponentName


android.content.ContentValues
android_content.ContentValues


android.content.Context
android_content.Context


android.content.Intent
android_content.Intent


android.content.IntentFilter
android_content.IntentFilter


android.content.SharedPreferences
android_content.SharedPreferences


android.database
android_database


android.database.Cursor
android_database.Cursor


android.database.CursorIndexOutOfBoundsException
android_database.CursorIndexOutOfBoundsException


android.database.DatabaseUtils
android_database.DatabaseUtils


android.database.MatrixCursor
android_database.MatrixCursor


android.database.SQLException
android_database.SQLException


android.graphics
android_graphics


android.graphics.Bitmap
android_graphics.Bitmap


android.graphics.Color
dart-ui.Color


android.graphics.Point
android_graphics.Point


android.graphics.PointF
android_graphics.PointF


android.graphics.drawable.Icon
flutter.Icon


android.hardware
android_hardware


android.hardware.Sensor
android_hardware.Sensor


android.hardware.SensorEvent
android_hardware.SensorEvent


android.hardware.SensorEventListener
android_hardware.SensorEventListener


android.hardware.SensorManager
android_hardware.SensorManager


android.location
android_location


android.location.Location
android_location.Location


android.media
android_media


android.media.FaceDetector
android_media.FaceDetector


android.media.FaceDetector.Face
android_media.Face


android.net
android_net


android.nfc
android_nfc


android.os
android_os


android.os.BatteryManager
android_os.BatteryManager


android.os.Build
android_os.Build


android.os.Bundle
android_os.Bundle


android.os.Environment
android_os.Environment


android.os.HardwarePropertiesManager
android_os.HardwarePropertiesManager


android.os.Parcel
android_os.Parcel


android.os.Parcelable
android_os.Parcelable


android.os.PowerManager
android_os.PowerManager


android.os.Process
android_os.Process


android.os.StatFs
android_os.StatFs


android.os.SystemClock
android_os.SystemClock


android.os.UserManager
android_os.UserManager


android.os.VibrationEffect
android_os.VibrationEffect


android.os.Vibrator
android_os.Vibrator


android.provider
android_provider


android.security
android_security


android.speech
android_speech


android.telephony
android_telephony


android.view
android_view


java.util.Locale
dart-ui.Locale



See Also #

The win32 package provides bindings to
the most common Win32 APIs.