过滤来电

在搭载 Android 10（API 级别 29）或更高版本的设备上，您的应用可以将来自用户通讯簿中未列号码的来电识别为潜在的骚扰电话。用户可以选择静默拒绝骚扰电话。为了让用户更清楚地了解何时有未接来电，系统会将这些被屏蔽的来电的相关信息记录到通话记录中。使用 Android 10 API，无需从用户处获取 READ_CALL_LOG 权限即可提供选接电话和来电显示功能。

您可以使用 CallScreeningService 实现来过滤来电。当相应号码不在用户联系人列表中时，针对任何新的来电或去电调用 onScreenCall() 函数。您可以查看 Call.Details 对象，了解有关该调用的信息。具体而言，getCallerNumberVerificationStatus() 函数包含网络服务提供商提供的有关另一个号码的信息。如果验证状态失败，则表示来电来自无效号码或疑似骚扰电话。

class ScreeningService : CallScreeningService() {
    // This function is called when an ingoing or outgoing call
    // is from a number not in the user's contacts list
    override fun onScreenCall(callDetails: Call.Details) {
        // Can check the direction of the call
        val isIncoming = callDetails.callDirection == Call.Details.DIRECTION_INCOMING

        if (isIncoming) {
            // the handle (e.g. phone number) that the Call is currently connected to
            val handle: Uri = callDetails.handle

            // determine if you want to allow or reject the call
            when (callDetails.callerNumberVerificationStatus) {
                Connection.VERIFICATION_STATUS_FAILED -> {
                    // Network verification failed, likely an invalid/spam call.
                }
                Connection.VERIFICATION_STATUS_PASSED -> {
                    // Network verification passed, likely a valid call.
                }
                else -> {
                    // Network could not perform verification.
                    // This branch matches Connection.VERIFICATION_STATUS_NOT_VERIFIED.
                }
            }
        }
    }
}

class ScreeningService extends CallScreeningService {
    @Override
    public void onScreenCall(@NonNull Call.Details callDetails) {
        boolean isIncoming = callDetails.getCallDirection() == Call.Details.DIRECTION_INCOMING;

        if (isIncoming) {
            Uri handle = callDetails.getHandle();

            switch (callDetails.getCallerNumberVerificationStatus()) {
                case Connection.VERIFICATION_STATUS_FAILED:
                    // Network verification failed, likely an invalid/spam call.
                    break;
                case Connection.VERIFICATION_STATUS_PASSED:
                    // Network verification passed, likely a valid call.
                    break;
                default:
                    // Network could not perform verification.
                    // This branch matches Connection.VERIFICATION_STATUS_NOT_VERIFIED
            }
        }
    }
}

将 onScreenCall() 函数设置为调用 respondToCall()，以告知系统如何响应新的调用。此函数采用 CallResponse 参数，您可以用它来指示系统屏蔽来电、像用户一样拒绝来电或将来电静音。您也可以告知系统完全跳过将此通话添加到设备的通话记录中。

// Tell the system how to respond to the incoming call
// and if it should notify the user of the call.
val response = CallResponse.Builder()
    // Sets whether the incoming call should be blocked.
    .setDisallowCall(false)
    // Sets whether the incoming call should be rejected as if the user did so manually.
    .setRejectCall(false)
    // Sets whether ringing should be silenced for the incoming call.
    .setSilenceCall(false)
    // Sets whether the incoming call should not be displayed in the call log.
    .setSkipCallLog(false)
    // Sets whether a missed call notification should not be shown for the incoming call.
    .setSkipNotification(false)
    .build()

// Call this function to provide your screening response.
respondToCall(callDetails, response)

// Tell the system how to respond to the incoming call
// and if it should notify the user of the call.
CallResponse.Builder response = new CallResponse.Builder();
// Sets whether the incoming call should be blocked.
response.setDisallowCall(false);
// Sets whether the incoming call should be rejected as if the user did so manually.
response.setRejectCall(false);
// Sets whether ringing should be silenced for the incoming call.
response.setSilenceCall(false);
// Sets whether the incoming call should not be displayed in the call log.
response.setSkipCallLog(false);
// Sets whether a missed call notification should not be shown for the incoming call.
response.setSkipNotification(false);

// Call this function to provide your screening response.
respondToCall(callDetails, response.build());

您必须使用适当的 intent 过滤器和权限在清单文件中注册 CallScreeningService 实现，以便系统可以正确触发该实现。

<service
    android:name=".ScreeningService"
    android:permission="android.permission.BIND_SCREENING_SERVICE">
    <intent-filter>
        <action android:name="android.telecom.CallScreeningService" />
    </intent-filter>
</service>