Question

我正在尝试使用SMS Broadcast Receiver自动将消息读入EditText。当我正在注册BroadcastReceiver错误时出现“Expression Expected”

IntentFilter smsFilter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
this.registerReceiver(SMSReceiver, smsFilter); //Expression Expected error occurred here

已解决：

我刚刚添加了新的this.registerReceiver(new SMSReceiver(), smsFilter);而不是this.registerReceiver(SMSReceiver, smsFilter);

我希望这对你有所帮助。

Answer 1

第一个参数应该是new SMSReceiver()，而不是@ρяσѕρєяK的评论中提到的类名SMSReceiver。

我建议您在onCreate()中对其进行实例化，然后在registerReceiver()和unregisterReceiver()

中使用它

// in onCreate or globally
SMSReceiver smsReceiver= new SMSReceiver();  
...

// and then in onResume  
IntentFilter smsFilter = new IntentFilter("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(smsReceiver, smsFilter);
....

// and in pause
unregisterReceiver(smsReceiver);

Answer 2

您是否在清单中添加以下代码？

<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.SEND_SMS"/>
<uses-permission android:name="android.permission.RECEIVE_SMS" />

如果没有，请添加此内容。

希望 SMSReceiver 是 BroadcastReceiver＆＃39> 实例。如果没有，则创建BroadcastReceiver的实例

registerReceiver中预期的表达式 - AndroidStudio

2 个答案: