屏幕通话

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通话识别为潜在的垃圾电话。用户可以选择将垃圾电话静音拒绝。为了在用户错过通话时提供更大的透明度，有关这些被阻止的通话的信息将记录在通话记录中。使用 Android 10 API 可以消除为了提供通话筛选和主叫号码识别功能而需要从用户那里获取 READ_CALL_LOG 权限的要求。

您使用 CallScreeningService 实现来筛选通话。当号码不在用户的联系人列表中时，对于任何新的传入或传出通话，请调用 onScreenCall() 函数。您可以查看 Call.Details 对象以获取有关通话的信息。具体来说，getCallerNumberVerificationStatus() 函数包含来自网络提供商的关于其他号码的信息。如果验证状态失败，则表明通话来自无效号码或潜在的垃圾电话。

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() 以告诉系统如何响应新通话。此函数采用 CallResponse 参数，您可以使用它来告诉系统阻止通话、像用户一样拒绝通话或将其静音。您还可以告诉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());

您必须在清单文件中使用适当的意图过滤器和权限注册 CallScreeningService 实现，以便系统可以正确地触发它。

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