Android-通话状态监测

在许多的场合需要对通话的状态进行监测，根据不同的通话状态进行不同的操作，代码如下。

import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.telephony.PhoneNumberFormattingTextWatcher;import android.telephony.PhoneNumberUtils;import android.telephony.PhoneStateListener;import android.telephony.ServiceState;import android.telephony.TelephonyManager;import android.util.Log;import android.widget.EditText;public class CheckStatusActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        TelephonyManager telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);        String opName = telManager.getNetworkOperatorName();        Log.i("telephony", "operator name = " + opName);        String phoneNumber = telManager.getLine1Number();        Log.i("telephony", "phone number = " + phoneNumber);        String providerName = telManager.getSimOperatorName();        Log.i("telephony", "provider name = " + providerName);        int callStatus = telManager.getCallState();        String callState = getCallStateString(callStatus);        Log.i("telephony", callState);        telManager.listen(new PhoneStateListener() {            public void onCallStateChanged(int state, String incomingNumber) {                String newState = getCallStateString(state);                if (state == TelephonyManager.CALL_STATE_RINGING) {                    Log.i("telephony", newState + " number = " + incomingNumber);                } else {                    Log.i("telephony", newState);                }            }        }, PhoneStateListener.LISTEN_CALL_STATE);        ServiceState serviceState = new ServiceState();        int serviceStatus = serviceState.getState();        String serviceStateString = getServiceStateString(serviceStatus);        Log.i("telephony", serviceStateString);        boolean isRoaming = serviceState.getRoaming();        Log.i("telephony", "Roaming state is " + isRoaming);        String formattedNumber = PhoneNumberUtils.formatNumber("9995551212");        Log.i("telephony", formattedNumber);        setContentView(R.layout.status);        EditText numberEntry = (EditText) findViewById(R.id.number_entry);        numberEntry.addTextChangedListener(new PhoneNumberFormattingTextWatcher());    }    private String getCallStateString(int callState)    {        String callStateString = null;        switch (callState) {            case TelephonyManager.CALL_STATE_IDLE:                callStateString = "Phone is idle.";                break;            case TelephonyManager.CALL_STATE_OFFHOOK:                callStateString = "Phone is in use.";                break;            case TelephonyManager.CALL_STATE_RINGING:                callStateString = "Phone is ringing!";                break;        }        return callStateString;    }    private String getServiceStateString(int serviceState) {        String serviceStateString = null;        switch (serviceState) {            case ServiceState.STATE_EMERGENCY_ONLY:                serviceStateString = "Emergency calls only";                break;            case ServiceState.STATE_IN_SERVICE:                serviceStateString = "Normal service";                break;            case ServiceState.STATE_OUT_OF_SERVICE:                serviceStateString = "No service available";                break;            case ServiceState.STATE_POWER_OFF:                serviceStateString = "Telephony radio is off";                break;        }        return serviceStateString;    }}