android 手机编程5.4

alltolove · 发表于 2017-10-10 10:42:40

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x

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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[学习笔记] android 手机编程5.4

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