从广播接收器android调用活动方法（）

冲天香阵透长安，满城尽带黄金甲。这篇文章主要讲述从广播接收器android调用活动方法？相关的知识，希望能为你提供帮助。
在我的应用程序中，我正在向移动设备发送端口短信。收到消息后，我需要在我的活动中执行一些任务并更新UI。
显示接收者的宣言

< receiver android:name="com.vfi.BinarySMSReceiver" > < intent-filter android:priority="10" > < action android:name="android.intent.action.DATA_SMS_RECEIVED" /> < data android:host="*" android:port="9512" android:scheme="sms" /> < /intent-filter> < /receiver>

接收器类

public class BinarySMSReceiver extends BroadcastReceiver {@Override public void onReceive(Context context, Intent intent) { Bundle bundle = intent.getExtras(); SmsMessage[] msgs = null; if (null != bundle) { String info = "SMS from "; String sender = ""; String msg = ""; Object[] pdus = (Object[]) bundle.get("pdus"); msgs = new SmsMessage[pdus.length]; byte[] data = https://www.songbingjia.com/android/null; for (int i = 0; i < msgs.length; i++) { msgs[i] = SmsMessage.createFromPdu((byte[]) pdus[i]); sender += msgs[i].getOriginatingAddress(); info += msgs[i].getOriginatingAddress() +" "; data = https://www.songbingjia.com/android/msgs[i].getUserData(); for (int index = 0; index < data.length; ++index) { info += Character.toString((char) data[index]); msg += Character.toString((char) data[index]); } } Log.e("SakjsdMS", "akjsdhkas" + msg); Log.e("sender", "asdasdasdasdasdasd" + info); ((VerifyActivity)context).msgReceived(msg); } } }

活动方法

publicvoid msgReceived(String msgContent) { if(msgContent.equalsIgnoreCase(etMobile.getText().toString().trim())){ showToast("Number Verified"); }else{ showToast("Sorry wrong number. Input your number again."); }}

我得到的例外

java.lang.RuntimeException: Unable to start receiver com.vfi.BinarySMSReceiver: java.lang.ClassCastException: android.app.ReceiverRestrictedContext cannot be cast to com.vfi.VerifyActivity at android.app.ActivityThread.handleReceiver(ActivityThread.java:2467) at android.app.ActivityThread.access$1700(ActivityThread.java:145) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1319) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5127) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassCastException: android.app.ReceiverRestrictedContext cannot be cast to com.vfi.VerifyActivity at com.vfi.BinarySMSReceiver.onReceive(BinarySMSReceiver.java:46) at android.app.ActivityThread.handleReceiver(ActivityThread.java:2460)

在android.app.ActivityThread.access $ 1700（ActivityThread.java:145）
如何在接收器中获取活动上下文来调用我的方法？
答案【从广播接收器android调用活动方法（）】我能够通过编程方式声明接收器来解决它：
在发送消息之前的活动中

private void sendSMS() { BinarySMSReceiver smsReceiver = null; smsReceiver = new BinarySMSReceiver(); smsReceiver.setActivityHandler(this); IntentFilter portIntentFilter = new IntentFilter("android.intent.action.DATA_SMS_RECEIVED"); portIntentFilter.addDataAuthority("*", "9512"); portIntentFilter.addDataScheme("sms"); registerReceiver(smsReceiver, portIntentFilter); String messageText = etMobile.getText().toString().trim(); short SMS_PORT = 9512; SmsManager smsManager = SmsManager.getDefault(); smsManager.sendDataMessage(etMobile.getText().toString().trim(), null, SMS_PORT, messageText.getBytes(), null, null); }

在接收器类

public class BinarySMSReceiver extends BroadcastReceiver { VerifyActivity vAct = null; void setActivityHandler(VerifyActivity main) { vAct = main; }@Override public void onReceive(Context context, Intent intent) { Bundle bundle = intent.getExtras(); SmsMessage[] msgs = null; if (null != bundle) { String info = "SMS from "; String sender = ""; String msg = ""; Object[] pdus = (Object[]) bundle.get("pdus"); msgs = new SmsMessage[pdus.length]; byte[] data = https://www.songbingjia.com/android/null; for (int i = 0; i < msgs.length; i++) { msgs[i] = SmsMessage.createFromPdu((byte[]) pdus[i]); sender += msgs[i].getOriginatingAddress(); info += msgs[i].getOriginatingAddress() +" "; data = https://www.songbingjia.com/android/msgs[i].getUserData(); for (int index = 0; index < data.length; ++index) { info += Character.toString((char) data[index]); msg += Character.toString((char) data[index]); } }Log.e("message", "receiver " + msg); Log.e("sender", "from " + info); vAct.msgReceived(msg); //activity method } }

}
取消注册接收器

@Override protected void onPause() { super.onPause(); unregisterReceiver(smsReceiver); }

另一答案你得到的错误是你错误地将android.app.ReceiverRestrictedContext投射到com.vfi.VerifyActivity。
如果您想实现您想要做的事情，只需通过提供一些额外信息开始您的活动。

public class BinarySMSReceiver extends BroadcastReceiver {@Override public void onReceive(Context context, Intent intent) { Bundle bundle = intent.getExtras(); SmsMessage[] msgs = null; if (null != bundle) { String info = "SMS from "; String sender = ""; String msg = ""; Object[] pdus = (Object[]) bundle.get("pdus"); msgs = new SmsMessage[pdus.length]; byte[] data = https://www.songbingjia.com/android/null; for (int i = 0; i < msgs.length; i++) { msgs[i] = SmsMessage.createFromPdu((byte[]) pdus[i]); sender += msgs[i].getOriginatingAddress(); info += msgs[i].getOriginatingAddress() +" "; data = https://www.songbingjia.com/android/msgs[i].getUserData(); for (int index = 0; index < data.length; ++index) { info += Character.toString((char) data[index]); msg += Character.toString((char) data[index]); } } Log.e("SakjsdMS", "akjsdhkas" + msg); Log.e("sender", "asdasdasdasdasdasd" + info); // HERE COMES THE CHANGE Intent intent = new Intent(context, YourActivityToLaunch.class); intent.putExtra("message_received", msg); context.startActivity(intent); } } }

在您的其他课程中，只需以这种方式检索您的信息：

Intent intent = getIntent(); String message = intent.getStringExtra("message_received");

而已。
希望这有帮助！
另一答案你的Context在BinarySMSReceiver传递的onReceive不是活动 - 它是Context in which the receiver is running。要启动Activity，您需要使用context.startActivity(Intent)并使用Intent将任何其他数据传递给Activity。
另一答案那

((VerifyActivity)context).msgReceived(msg);

那是你的错。你为什么假设这个背景是你的活动？
最好的方法（没有第三方库）来发送本地广播。
在另一个答案，我给出了如何使用LocalBroadcast Best practice to launch AsyncTask from custom view的一般概念
如果您使用第三方库，我建议您查看Otto的Square
另一答案默认情况下，您的BroadcastReceiver对任何活动都不了解。您必须为其提供上下文，例如在创建broadcastReceiver时在构造函数中。