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发送有序广播就是把sendBroadcast()语句改成sendOrderedBroadcast()就行了,太简单这里就不说了。下面说一下本地广播,就是程序自己只给自己发送的广播,其他程序收不到。为了省事我们从新建个项目,然后把布局文件添加个按钮,就是把activity_main.xml文件修改成- <?xml version="1.0" encoding="utf-8"?>
- <android.support.constraint.ConstraintLayout 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"
- tools:context="com.example.xinwei.localbroadcast.MainActivity">
- <Button
- android:id="@+id/button"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="sent local broadcast"/>
- </android.support.constraint.ConstraintLayout>
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然后修改mainactivity.java文件,在这个文件里写了个内部类用于接收广播,就不再另写一个文件了- package com.example.xinwei.localbroadcast;
- import android.content.BroadcastReceiver;
- import android.content.Context;
- import android.content.Intent;
- import android.content.IntentFilter;
- import android.support.v4.content.LocalBroadcastManager;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.Button;
- import android.widget.Toast;
- public class MainActivity extends AppCompatActivity {
- private IntentFilter intentFilter;
- private LocalReceiver localreceiver;
- private LocalBroadcastManager localBroadcastManager;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- localBroadcastManager = LocalBroadcastManager.getInstance(this);
- Button button=(Button)findViewById(R.id.button);
- button.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- Intent intent = new Intent();
- intent.setAction("alltolove.LOCAL_BROADCAST");
- localBroadcastManager.sendBroadcast(intent);
- }
- });
- intentFilter=new IntentFilter();
- intentFilter.addAction("alltolove.LOCAL_BROADCAST");
- localreceiver=new LocalReceiver();
- localBroadcastManager.registerReceiver(localreceiver,intentFilter);
- }
- class LocalReceiver extends BroadcastReceiver{
- @Override
- public void onReceive(Context context, Intent intent) {
- Toast.makeText(context, "received local broadcast", Toast.LENGTH_SHORT).show();
- }
- }
- @Override
- protected void onDestroy() {
- super.onDestroy();
- localBroadcastManager.unregisterReceiver(localreceiver);
- }
- }
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效果图为:
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