Detailed explanation of BroadCast Receiver (broadcast)

目录

静态广播

1.First create the broadcast receiver here

 2.在AndroidManifest.xmlWrite the static receive name in

3.Send the broadcast to the static broadcast receiver in the main method

4.Receive broadcasts in a broadcast receiver

动态广播:

1.Create broadcast inheritanceBroadcastReceiver

2.Register the dynamic broadcast in the main method

3.Sent to dynamic broadcast

4.反注册

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 BroadCast Receiver是四大组件之一,是一个全局的监听器

BroadCast Receiver有两大功能,广播发送者,广播接收者

BroadCast ReceiverDivided into static broadcasting and dynamic dynamic broadcasting

静态广播

1.First create the broadcast receiver here

 2.在AndroidManifest.xmlWrite the static receive name in

        <receiver
            android:name=".MyStaiticReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="wzk" />
            </intent-filter>
        </receiver>

3.Send the broadcast to the static broadcast receiver in the main method

        btn_sendstatic=findViewById(R.id.btn_sendstatic);

        btn_sendstatic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Send a broadcast to static broadcast receivers
                Intent intent=new Intent();
                //在Android8.0The above does not support static broadcasting,Need to add this one
                intent.setPackage(getPackageName());
                intent.setAction("wzk");
                intent.putExtra("info","你好");
                sendBroadcast(intent);
            }
        });        btn_sendstatic=findViewById(R.id.btn_sendstatic);

        btn_sendstatic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //Send a broadcast to static broadcast receivers
                Intent intent=new Intent();
                intent.setPackage(getPackageName());
                intent.setAction("wzk");
                intent.putExtra("info","你好");
                sendBroadcast(intent);
            }
        });

4.Receive broadcasts in a broadcast receiver

        Log.i("MyStaiticReceiver","接收到的值是"+intent.getStringExtra("info"));

动态广播:

1.Create broadcast inheritanceBroadcastReceiver

    class MyDymnicReveiver extends BroadcastReceiver{

        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i("动态广播接收者",intent.getStringExtra("info"));

        }
    }

2.Register the dynamic broadcast in the main method

        //注册动态广播
        myDymnicReveiver=new MyDymnicReveiver();
        IntentFilter intentFilter=new IntentFilter();
        intentFilter.addAction("666");
        registerReceiver(myDymnicReveiver,intentFilter);

3.Sent to dynamic broadcast

        //Send to dynamic broadcast
        btn_send = findViewById(R.id.btn_send);
        btn_send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent();
                intent.setAction("666");
                intent.putExtra("info","dynamic broadcast hello");
                sendBroadcast(intent);
            }
        });

4.反注册

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (myDymnicReveiver!=null){
            unregisterReceiver(myDymnicReveiver);
        }
    }