session-android/src/org/thoughtcrime/securesms/sms/TelephonyServiceState.java

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package org.thoughtcrime.securesms.sms;
import android.content.Context;
import android.os.Looper;
import android.telephony.PhoneStateListener;
import android.telephony.ServiceState;
import android.telephony.TelephonyManager;
public class TelephonyServiceState {
public boolean isConnected(Context context) {
ListenThread listenThread = new ListenThread(context);
listenThread.start();
return listenThread.get();
}
private static class ListenThread extends Thread {
private final Context context;
private boolean complete;
private boolean result;
public ListenThread(Context context) {
this.context = context.getApplicationContext();
}
@Override
public void run() {
Looper looper = initializeLooper();
ListenCallback callback = new ListenCallback(looper);
TelephonyManager telephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
telephonyManager.listen(callback, PhoneStateListener.LISTEN_SERVICE_STATE);
Looper.loop();
telephonyManager.listen(callback, PhoneStateListener.LISTEN_NONE);
set(callback.isConnected());
}
private Looper initializeLooper() {
Looper looper = Looper.myLooper();
if (looper == null) {
Looper.prepare();
}
return Looper.myLooper();
}
public synchronized boolean get() {
while (!complete) {
try {
wait();
} catch (InterruptedException e) {
throw new AssertionError(e);
}
}
return result;
}
private synchronized void set(boolean result) {
this.result = result;
this.complete = true;
notifyAll();
}
}
private static class ListenCallback extends PhoneStateListener {
private final Looper looper;
private volatile boolean connected;
public ListenCallback(Looper looper) {
this.looper = looper;
}
@Override
public void onServiceStateChanged(ServiceState serviceState) {
this.connected = (serviceState.getState() == ServiceState.STATE_IN_SERVICE);
looper.quit();
}
public boolean isConnected() {
return connected;
}
}
}