广播接收机的呼叫活动方法

Question

在主活动中,加载了一个包含一些输入字段和一个提交按钮的布局.单击提交按钮时,onClick处理程序方法会将短信发送回同一个手机号码:

SmsManager sms = SmsManager.getDefault();
sms.sendTextMessage(number, null, "hi", null, null);

定义的广播接收器拦截消息:

public class SmsReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    Bundle pdusBundle = intent.getExtras();
    Object[] pdus=(Object[])pdusBundle.get("pdus");
    SmsMessage messages=SmsMessage.createFromPdu((byte[]) pdus[0]);
    if(messages.getMessageBody().contains("hi")){
        abortBroadcast();
    }

}
}

现在,从广播接收器,我想调用一个函数(带参数),这是我的主要活动.那可能吗？如果是,我应该在广播接收器中添加什么样的代码？

Answer 1

谢谢@Manishika.详细说明,使Broadcastreceiver动态化,而不是在清单中定义它,就可以了.所以在我的广播接收器类中,我添加了代码:

MainActivity main = null;
void setMainActivityHandler(MainActivity main){
    this.main=main;
}

在BroadcastReceiver类的onReceive函数的最后,我调用main活动的函数:

main.verifyPhoneNumber("hi");

在主要活动中,我在发送短信之前动态定义并注册广播接收器:

SmsReceiver BR_smsreceiver = null;
BR_smsreceiver = new SmsReceiver();
BR_smsreceiver.setMainActivityHandler(this);
IntentFilter fltr_smsreceived = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(BR_smsreceiver,fltr_smsreceived);  

Answer 2

将Activity的上下文传递给BroadcastReceiver的构造函数.

public class SmsReceiver extends BroadcastReceiver{

    MainActivity ma; //a reference to activity's context

    public SmsReceiver(MainActivity maContext){
        ma=maContext;
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        ma.brCallback("your string"); //calling activity method
    }

}

并在您的MainActivity中

public class MainActivity extends AppCompatActivity {
    ...
    public void onStart(){
        ...        
    SmsReceiver smsReceiver = new SmsReceiver(this); //passing context
    LocalBroadcastManager.getInstance(this).registerReceiver(smsReceiver,null);
        ...
    }

    public void brCallback(String param){
        Log.d("BroadcastReceiver",param);
    }
}

希望能帮助到你