如何从本机(Android)将数据发送到Flutter

Question

我需要将数据从下面的类传递到我的颤振应用程序，其中数据仅在发生传入呼叫事件时才可用。 我需要将此数据(手机号码(传递给 Flutter(如果可能的话，即使 Flutter 应用程序被终止，我也需要传递数据(

广播接收.java

package com.ashbu.flutterappbackground;
...
public class MyBroadcastReceiver extends BroadcastReceiver {
String phoneNumber;
@Override
public void onReceive(final Context context, Intent intent) {
TelephonyManager telephony = (TelephonyManager)context.getSystemService(Service.TELEPHONY_SERVICE);
telephony.listen(new PhoneStateListener(){
@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
phoneNumber = incomingNumber;
Toast.makeText(context, "TeleDuce Customer "+ incomingNumber,
Toast.LENGTH_LONG).show();
}
},PhoneStateListener.LISTEN_CALL_STATE);
}

public  String getData() {
String number = null;
if (phoneNumber != null) {
number = phoneNumber;
}else {
number = "noData";
}
return number;
}

} 从上面的代码中，我需要传递传入的数字来颤振。 如果可能 - 即使应用程序已关闭，也共享数据。

主活动.java

public class MainActivity extends FlutterActivity {
private static final String CHANNEL = "samples.flutter.dev/getNumber";
AlarmManager alarmManager;
PendingIntent pendingIntent;
@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
super.configureFlutterEngine(flutterEngine);
alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent alarmIntent = new Intent(this, MyService.class);
pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
.setMethodCallHandler(
(call, result) -> {
// Note: this method is invoked on the main thread.
if (call.method.equals("getMobileNumber")) {
startAlarm();
MyBroadcastReceiver dataGEt = new MyBroadcastReceiver();
System.out.println(dataGEt.getData());
result.success(dataGEt.getData());
} else {
cancelAlarm();
}
}
);
}
private void startAlarm() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
alarmManager.setAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, 0, pendingIntent);
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
alarmManager.setExact(AlarmManager.RTC_WAKEUP, 0, pendingIntent);
} else {
alarmManager.set(AlarmManager.RTC_WAKEUP, 0, pendingIntent);
}
}
private void cancelAlarm() {
alarmManager.cancel(pendingIntent);
Toast.makeText(getApplicationContext(), "Alarm Cancelled", Toast.LENGTH_LONG).show();
}
}

目前，即使应用程序终止，上述代码也可以工作。但我不知道应用程序终止后颤振是否会接受数据

Answer 1

你应该在 Flutterside 中实现methodHandler，你应该成为方法通道的静态对象

例如

class MethodChannelHelper {
static const MethodChannel channel = const MethodChannel('method_channal_name');
}
class MethodChannelCall{
static initMethodChannel({Function onCallBack}) async {
MethodChannelHelper.channel.setMethodCallHandler((MethodCall call) async {
switch (call.method) {
case 'callback_from_native':
print("This method will be called when native fire")
}
});
await MethodChannelHelper.channel.invokeMethod('call_native');
}
}

在主飞镖中

void main() async {
WidgetsFlutterBinding.ensureInitialized();
await MethodChannelCall.initMethodChannel(onCallBack: (payload) {
});
runApp(MyApp());
}

现在在安卓方面

override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
when (call.method) {
"call_native" -> {
methodChannel?.invokeMethod("callback_from_native","")
}
}

Answer 2

我将列表作为参数从main.dart传递给MainActivity.kt类

在主镖中

var  items =['hello', 'hii', 'flowers', 'roses','loutes']; 
Future<void> _getDeviceInfo() async {
String result;
try {
platform.invokeMethod('getDeviceInfo' , items).then((items) {
result = items.toString();
setState(() {
deviceInfo = result;
});
});
} on PlatformException catch (e) {
print("_getDeviceInfo==>${e.message}");
}
}

在 MainActivity.kt 类中

package com.example.flutter_to_native

import android.content.Intent
import android.os.Bundle
import android.os.PersistableBundle
import android.util.Log
import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel
class MainActivity : FlutterActivity() {
private val CHANNEL = "com.example.flutter/device_info" // Unique Channel

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
// Note: this method is invoked on the main thread.
call, result ->
if (call.method == "getDeviceInfo") {
val data = call.arguments
Log.d("data1", "$data")
val intent = Intent(this, DemoActivity::class.java)
intent.putExtra("data",data.toString())
startActivity(intent)
else {
result.notImplemented()
}
}
}


}