Android：如何在for循环内调用意图？

Question

In my application I need to make a call by an intent several times. This is the scenario. 1. User enters a phone number, delay time and number of attempts in the interface. 2. Once user press the dial button in my UI it will make a call and will hang up after the specified delay. 3. Once hung up, the app needs to make a call again until the entered number of attempts is satisfied.

I have used android ITelephony.aidl and java reflection to call hangup function. For one attempt I can successfully terminate the call. The problem occurs when I need to make several attempts. This is my code:

private void sendCommand(String number, int delay, int tries){
    for(int i=0;i<tries;i++){
        callPhone(number);
        delayTimer(delay);
    }
}
private void callPhone(String number){
    String num = "0776355524";
    Intent callIntent = new Intent(Intent.ACTION_CALL);
    if(!(number.equalsIgnoreCase(""))){
        num = number;
    }   
    callIntent.setData(Uri.parse("tel:"+num));
    startActivity(callIntent);
}
private void delayTimer(int delay){
    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            // Do something after delay
            if(isOffhook()){
                cancelCall();
            }

        }
    }, delay);
}

private boolean isOffhook(){
     TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
try {
    Log.v(TAG, "Get getTeleService...");
    Class c = Class.forName(tm.getClass().getName());
    Method m = c.getDeclaredMethod("getITelephony");
    m.setAccessible(true);
    telephonyService = (ITelephony) m.invoke(tm);

    return telephonyService.isOffhook();

    } catch (Exception e) {
        e.printStackTrace();
        Log.d(TAG, "Error in accessing Telephony Manager: "+ e.toString());
         telephonyService = null;
    }

    return false;
}

private void cancelCall(){
    Log.d(TAG, "Ending call..."+ incomingNumber);
    try {
        if(telephonyService != null)
        telephonyService.endCall();
    } catch (Exception e) {
        e.printStackTrace();
        Log.d(TAG, "Error in accessing Telephony Manager: "+ e.toString());
    }
}

What am I doing wrong in my code. Thanks in advance, Hasala

Answer 1

This can't work:

for(int i=0;i<tries;i++){
    callPhone(number);
    delayTimer(delay);
}

This loop calls the number, then posts a Runnable to hangup after some period of time. Then immediately calls the number again. You need to wait for the delay before calling the number again. Do this once (not in a loop):

    callPhone(number);
    delayTimer(delay);

Then, in your Runnable , do this:

        // Do something after delay
        if(isOffhook()){
            cancelCall();
        }
        // now call the number again
        callPhone(number);
        // reschedule the delay
        delayTimer(delay);

You'll have to keep track of the number of tries somewhere, so you know when to stop.