筛选来电

运行 Android 10（API 级别 29）或更高版本的设备允许您的应用将来自不在用户通讯录中的号码的来电识别为潜在的骚扰电话。用户可以选择静默拒接骚扰电话。为了在用户错过电话时提供更高的透明度，这些被阻止的电话的相关信息会记录在通话记录中。使用 Android 10 API，您无需获得用户授予的 READ_CALL_LOG 权限即可提供来电筛选和主叫号码显示功能。

您可以使用 CallScreeningService 实现来筛选来电。当号码不在用户的联系人列表中时，针对任何新的来电或去电调用 onScreenCall() 函数。您可以检查 Call.Details 对象以获取通话信息。具体来说，getCallerNumberVerificationStatus() 函数包含来自网络提供商的关于对方号码的信息。如果验证状态失败，这很好地表明该通话来自无效号码或是一个潜在的骚扰电话。

Kotlin

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.
                }
            }
        }
    }
}

Java

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来电。此函数接受一个 CallResponse 参数，您可以使用它来指示系统阻止来电，或者像用户亲自拒绝一样拒绝它，或者将来电静音。您还可以指示系统完全跳过将此通话添加到设备的通话记录中。

Kotlin

// 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)

Java

// 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());

您必须在清单文件中注册 CallScreeningService 实现，并附带适当的 Intent 过滤器和权限，以便系统能够正确触发它。

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