035 Android 广播(BroadCastReceiver)

1.介绍

2.实现方法

3.注册广播

(1)静态广播

在AndroidManifest.xml文件中注册广播

<intent-filter>为过滤器

<receiver android:name=".MyBroadCast1"></receiver>
        <receiver android:name=".MyBroadCast2">
            <intent-filter>
                <action android:name="com.lucky"></action>
            </intent-filter>
        </receiver>

(2)动态广播

4.静态广播代码

(1)主界面

package com.lucky.test40broadcastreceiver;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Button button1;
    Button button2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1=findViewById(R.id.button);
        button2=findViewById(R.id.button2);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,MyBroadCast1.class);
                sendBroadcast(intent); //发送广播
            }
        });
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //设置Action为com.lucky，会在AndroidManifest.xml中的receiver中启动action为com.lucky的广播
                Intent intent=new Intent();
                intent.setAction("com.lucky");
                sendBroadcast(intent);
            }
        });
    }
}

(2)广播接收器1(采用Toast语句进行提示)

package com.lucky.test40broadcastreceiver;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

//MyBroadCast1广播接收器
public class MyBroadCast1 extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"接收到广播",Toast.LENGTH_SHORT).show();
    }
}

(3)广播接收器2(采用通知的方式进行提示)

package com.lucky.test40broadcastreceiver;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.support.annotation.RequiresApi;

public class MyBroadCast2 extends BroadcastReceiver {
    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public void onReceive(Context context, Intent intent) {
        //采用通知的形式
        NotificationManager manager= (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification.Builder builder=new Notification.Builder(context);
        builder.setSmallIcon(R.mipmap.ic_launcher); //给通知设置图标
        builder.setTicker("广播消息"); //设置提示消息
        builder.setContentTitle("您有一条广播消息");//设置内容标题
        builder.setContentText("hello lucky");    //设置通知内容
        manager.notify(0x01,builder.build()); //让通知显示
    }
}

5.动态广播

(1)主界面

package com.lucky.test41broadcastreceiver2;

import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Button button1;
    MyBroadCast myBroadCast;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1=findViewById(R.id.button);

        //注册广播
        myBroadCast=new MyBroadCast(); //实例化广播接收器
        IntentFilter intentFilter=new IntentFilter();//实例化一个过滤器
        intentFilter.addAction("com.lucky"); //添加action来明确接收哪种类型的广播
        registerReceiver(myBroadCast,intentFilter);//注册广播

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //发送广播
                Intent intent=new Intent();
                intent.setAction("com.lucky");
                sendBroadcast(intent);
            }
        });
    }
}

(2)广播接收器

package com.lucky.test41broadcastreceiver2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyBroadCast extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"hello lucky",Toast.LENGTH_SHORT).show();
    }
}