broadcastReceiver内部的Android Java回调空

我试图在Android收到短信时获得通知，因此我为此编写了一个新类，如下所示：

public class MyBroadcastReceiver extends BroadcastReceiver {
    public MyBroadcastCallback callback;

    public MyBroadcastReceiver() {}

    public MyBroadcastReceiver(MyBroadcastCallback callback) {
        this.callback=callback;
        Log.d("myTag", "MyBroadcastReceiver CONSTRUCTOR.... "+this.callback);
        this.callback.OnReceiveSMS("phone TEST","message TEST");
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle intentExtras = intent.getExtras();

        if (intentExtras != null) {

            Object[] sms = (Object[]) intentExtras.get("pdus");

            for (int i = 0; i < sms.length; ++i) {

                SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) sms[i]);

                String phone = smsMessage.getOriginatingAddress();
                String message = smsMessage.getMessageBody().toString();

                this.callback.OnReceiveSMS(phone,message);
            }
        }
    }

    public interface MyBroadcastCallback {
        void OnReceiveSMS(String phone,String message);
    }
}

public class MainActivity extends AppCompatActivity implements MyBroadcastReceiver.MyBroadcastCallback {

    MyBroadcastReceiver broadcastReceiver=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ....
        super.onCreate(savedInstanceState);
        broadcastReceiver=new MyBroadcastReceiver(this);
        ....
    }

    @Override
    public void OnReceiveSMS(String phone, String message) {
        Log.d("myTag", "NEW SMS MESSAGE PHONE="+phone + " message="+message);
    }
}

<receiver android:name=".MyBroadcastReceiver">
    <intent-filter>
        <action android:name="android.provider.Telephony.SMS_RECEIVED" />
    </intent-filter>
</receiver>

this.callback.OnReceiveSMS(phone, message);

Android清单如下所示：

public class MyBroadcastReceiver extends BroadcastReceiver {
    public MyBroadcastCallback callback;

    public MyBroadcastReceiver() {}

    public MyBroadcastReceiver(MyBroadcastCallback callback) {
        this.callback=callback;
        Log.d("myTag", "MyBroadcastReceiver CONSTRUCTOR.... "+this.callback);
        this.callback.OnReceiveSMS("phone TEST","message TEST");
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle intentExtras = intent.getExtras();

        if (intentExtras != null) {

            Object[] sms = (Object[]) intentExtras.get("pdus");

            for (int i = 0; i < sms.length; ++i) {

                SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) sms[i]);

                String phone = smsMessage.getOriginatingAddress();
                String message = smsMessage.getMessageBody().toString();

                this.callback.OnReceiveSMS(phone,message);
            }
        }
    }

    public interface MyBroadcastCallback {
        void OnReceiveSMS(String phone,String message);
    }
}

public class MainActivity extends AppCompatActivity implements MyBroadcastReceiver.MyBroadcastCallback {

    MyBroadcastReceiver broadcastReceiver=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ....
        super.onCreate(savedInstanceState);
        broadcastReceiver=new MyBroadcastReceiver(this);
        ....
    }

    @Override
    public void OnReceiveSMS(String phone, String message) {
        Log.d("myTag", "NEW SMS MESSAGE PHONE="+phone + " message="+message);
    }
}

<receiver android:name=".MyBroadcastReceiver">
    <intent-filter>
        <action android:name="android.provider.Telephony.SMS_RECEIVED" />
    </intent-filter>
</receiver>

this.callback.OnReceiveSMS(phone, message);

它崩溃，异常情况是

this.callback

为

null

我知道一开始它不是

null

，因为在构造函数中我传入了实现该接口的主活动

为了进行调试，我还在构造函数中打印了

this.callback

，甚至在构造函数中调用了该函数，以确保它不是

null

，所有这些都能正常工作，但当一个文本出现并且安卓操作系统调用

OnReceive

时，它不知何故变成了

null

---

有人知道为什么它是空的吗？如何修复？

问题是，如果您只创建了类对象。您还必须为来自活动的sms创建广播目的过滤器，然后必须注册来自活动的广播。同时从manifest.xml中删除广播。将值从接收者传递给活动的最佳选择是使用本地广播管理器。因此，我必须接收大型主SMS广播，然后使用本地广播将其重新广播给我自己？感谢各位本地广播工作！！！