Android学习笔记BroadcastReceiver（广播接收者）

Android发送广播的过程

代码实现

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = findViewById(R.id.btn_Broadcast);//获取广播按钮
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("马云");
                //为Itent添加动作zuckerg
                sendBroadcast(intent);//发送广播
            }
        });
    }
}

MyReceiver.java

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

public class MyReceiver extends BroadcastReceiver {
    private static final String ACTIONI = "马云";//动作1
    private static final String ACTION2 = "小腾腾";
    @Override
    public void onReceive(Context context, Intent intent) {
        if(intent.getAction().equals(ACTIONI)){//回复第一个广播
            Toast.makeText(context,
                    "MyReceiver收到:马云的广播",
                    Toast.LENGTH_SHORT).show();
        }else if(intent.getAction().equals(ACTION2)){//回复第二个广播
            Toast.makeText(context,"MyReceiver收到:小腾腾的广播",
                    Toast.LENGTH_SHORT).
                    show();
        }
    }
}

AndroidManifest.xml清单文件注册BroadcastReceiver

        <!--
             注册广播接收器
             android:enabled="true"可以被实例化
             android:exported="true"能接收其他app的广播
         -->
        <receiver
            android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true"
            tools:ignore="WrongManifestParent">
            <intent-filter>
                <!--配置允许接收的Action-->
                <action android:name="马云"/>
                <action android:name="小腾腾"/>
            </intent-filter>
        </receiver>
    </application>