Android 使用Telephony API



public class TelephonyDemo extends Activity {
    TextView textOut;
    TelephonyManager telephonyManager;
    PhoneStateListener listener;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
        // Get the UI
        textOut = (TextView) findViewById(R.id.textOut);
        // Get the telephony manager
        telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        // Create a new PhoneStateListener
        listener = new PhoneStateListener() {
            @Override
            public void onCallStateChanged(int state, String incomingNumber) {
                String stateString = "N/A";
                switch (state) {
                case TelephonyManager.CALL_STATE_IDLE:
                    stateString = "Idle";
                    break;
                case TelephonyManager.CALL_STATE_OFFHOOK:
                    stateString = "Off Hook";
                    break;
                case TelephonyManager.CALL_STATE_RINGING:
                    stateString = "Ringing";
                    break;
                }
                textOut.append(String.format("\nonCallStateChanged: %s",
                        stateString));
            }
        };
        // Register the listener wit the telephony manager
        telephonyManager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);
    }
}


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