在安卓系统中接听电话时,请说出录音文本

我正在开发一个应用程序,我想在其中生成一个语音文件,即每次打电话时使用文本到语音的书面文本。我能够通过无障碍服务检测到接收者何时接听电话。以下是代码:-

public class CallDetection extends AccessibilityService {
@Override
public void onAccessibilityEvent(AccessibilityEvent event) {

    if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED) {
        Log.i("myaccess", "in window changed");


        AccessibilityNodeInfo info = event.getSource();
        if (info != null && info.getText() != null) {
            String duration = info.getText().toString();
            String zeroSeconds = String.format("%02d:%02d", new Object[]{Integer.valueOf(0), Integer.valueOf(0)});
            String firstSecond = String.format("%02d:%02d", new Object[]{Integer.valueOf(0), Integer.valueOf(1)});
            Log.d("myaccess", "after calculation - " + zeroSeconds + " --- " + firstSecond + " --- " + duration);
            if (zeroSeconds.equals(duration) || firstSecond.equals(duration)) {
                Toast.makeText(getApplicationContext(), "Call answered", Toast.LENGTH_SHORT).show();
                // Your Code goes here

            }
            info.recycle();
        }

    }
}

@Override
protected void onServiceConnected() {
    super.onServiceConnected();
    Toast.makeText(this, "Service connected", Toast.LENGTH_SHORT).show();
    AccessibilityServiceInfo info = new AccessibilityServiceInfo();
    info.eventTypes = AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED;
    info.feedbackType = AccessibilityServiceInfo.FEEDBACK_GENERIC;
    info.notificationTimeout = 0;
    info.packageNames = null;
    setServiceInfo(info);
}

@Override
public void onInterrupt() {

}

}

现在,我使用文本到语音来播放声音,但这在这里不起作用。我既不能在服务中使用它,也不能在其他手机上使用任何声音。我搜索发现android不允许应用在通话中发送语音。这是真的吗?帮我解决这个问题。