StatusBar.java 文件源码

private void setupSignalStrength() {
    final TelephonyManager manager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
    final ImageView signalIcon = ((ImageView) statusBar.findViewById(R.id.signal_icon));
    phoneListener = new PhoneStateListener() {
        @Override
        public void onSignalStrengthsChanged(SignalStrength signalStrength) {
            if (manager.getNetworkOperator().equals("")) {
                signalIcon.setVisibility(View.GONE);
            } else {
                signalIcon.setVisibility(View.VISIBLE);
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                    // See https://github.com/AlstonLin/TheLearningLock/issues/54
                    Integer imageRes = signalStrengthToIcon.get(signalStrength.getLevel());
                    if (imageRes != null) signalIcon.setImageResource(imageRes);
                    else signalIcon.setImageResource(signalStrengthToIcon.get(4));
                } else {
                    // Just show the full icon
                    signalIcon.setImageResource(signalStrengthToIcon.get(4));
                }
            }
        }
    };
    manager.listen(phoneListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
}