<receiver
            android:name=".SimpleBroadCastReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="org.mk.demo.broadcast.SimpleBroadCast"/>
            </intent-filter>
 
        </receiver>

package org.mk.android.demo.demo;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.widget.Toast;
 
public class SimpleBroadCastReceiver extends BroadcastReceiver {
    private final String ACTION_BOOT = "org.mk.demo.broadcast.SimpleBroadCast";
    private final String TAG = "SendBroadCast";
 
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
        if (intent.getAction().equals(ACTION_BOOT)) {
            Log.i(TAG, "receive: " + ACTION_BOOT);
            Toast.makeText(context, "receive: " + ACTION_BOOT, Toast.LENGTH_LONG).show();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
 
    <Button
        android:id="@+id/buttonSendBroadCast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="發(fā)送一條BroadCast信息"/>
</LinearLayout>

package org.mk.android.demo.demo;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity {
 
    private Button buttonSendBroadCast;
    private final String TAG = "SendBroadCast";
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        buttonSendBroadCast = (Button) findViewById(R.id.buttonSendBroadCast);
        buttonSendBroadCast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i(TAG,"start send broadcast");
                Intent bIntent=new Intent("org.mk.demo.broadcast.SimpleBroadCast");
                bIntent.addFlags(Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
                sendBroadcast(bIntent);
            }
        });
    }
}