Android 中 LocalBroadcastManager 的基本使用

概述Android中LocalBroadcastManager的基本使用BroadActivity2发广播,BroadActivity接受.BroadActivity文件packagecom.example.hello.broadcast;importandroidx.appcompat.app.AppCompatActivity;importandroidx.localbroadcastmanager.content.LocalBr

AndroID 中 LocalbroadcastManager 的基本使用

broadActivity2@H_403_13@ 发广播, broadActivity@H_403_13@ 接受.

broadActivity@H_403_13@ 文件

package com.example.hello.broadcast;import androIDx.appcompat.app.AppCompatActivity;import androIDx.localbroadcastmanager.content.LocalbroadcastManager;import androID.content.broadcastReceiver;import androID.content.Context;import androID.content.Intent;import androID.content.IntentFilter;import androID.os.Bundle;import androID.Widget.button;import androID.Widget.TextVIEw;import com.example.hello.R;public class broadActivity extends AppCompatActivity {    private button btnClick;    private TextVIEw tvTest;    private Mybroadcast mybroadcast;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_broad);        btnClick = findVIEwByID(R.ID.btn_click);        tvTest = findVIEwByID(R.ID.tv_test);        btnClick.setonClickListener(v -> {            Intent intent = new Intent(broadActivity.this, broadActivity2.class);            startActivity(intent);        });        mybroadcast = new Mybroadcast();        IntentFilter intentFilter = new IntentFilter();        intentFilter.addAction("com.example.hello.broadcast.broadActivity2");        LocalbroadcastManager.getInstance(this).registerReceiver(mybroadcast, intentFilter);    }    private class Mybroadcast extends broadcastReceiver {        @OverrIDe        public voID onReceive(Context context, Intent intent) {            switch (intent.getAction()) {                case "com.example.hello.broadcast.broadActivity2":                    CharSequence newText = "123";                    tvTest.setText(newText);                    break;                default:                    throw new IllegalStateException("Unexpected value: " + intent.getAction());            }        }    }    @OverrIDe    protected voID onDestroy() {        super.onDestroy();        LocalbroadcastManager.getInstance(this).unregisterReceiver(mybroadcast);    }}

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:app="http://schemas.androID.com/apk/res-auto"    xmlns:tools="http://schemas.androID.com/tools"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:orIEntation="vertical"    androID:padding="15dp"    tools:context=".broadcast.broadActivity">    <button        androID:ID="@+ID/btn_click"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content"        androID:text="@string/click" />    <TextVIEw        androID:ID="@+ID/tv_test"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content"        androID:layout_margintop="15dp"        androID:gravity="center"        androID:text="@string/app_name"        androID:textcolor="@color/black"        androID:textSize="25sp" /></linearLayout>

broadActivity2@H_403_13@ 文件

package com.example.hello.broadcast;import androIDx.appcompat.app.AppCompatActivity;import androIDx.localbroadcastmanager.content.LocalbroadcastManager;import androID.content.Intent;import androID.os.Bundle;import androID.Widget.button;import com.example.hello.R;public class broadActivity2 extends AppCompatActivity {    private button btnClick;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_broad2);        btnClick = findVIEwByID(R.ID.btn_click);        btnClick.setonClickListener(v -> {            LocalbroadcastManager.getInstance(broadActivity2.this).sendbroadcast(new Intent("com.example.hello.broadcast.broadActivity2"));        });    }}

<?xml version="1.0" enCoding="utf-8"?><linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"    xmlns:app="http://schemas.androID.com/apk/res-auto"    xmlns:tools="http://schemas.androID.com/tools"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    androID:orIEntation="vertical"    androID:padding="15dp"    tools:context=".broadcast.broadActivity2">    <button        androID:ID="@+ID/btn_click"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content"        androID:text="@string/click" /></linearLayout>

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