获取手机状态：

	import android.content.Context;import android.telephony.TelephonyManager;//获得相应的系统服务TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);/*** 返回电话状态* * CALL_STATE_IDLE 无任何状态时 * CALL_STATE_OFFHOOK 接起电话时* CALL_STATE_RINGING 电话进来时 */tm.getCallState();if(tm.getCallState() == TelephonyManager.CALL_STATE_IDLE) {Log.d("test", "call state idle...");} else if(tm.getCallState() == TelephonyManager.CALL_STATE_OFFHOOK) {Log.d("test", "call state offhook...");} else if(tm.getCallState() == TelephonyManager.CALL_STATE_RINGING) {Log.d("test", "call state ringing...");}

监听手机来电状态：

        //获得相应的系统服务TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);//使用TelephonyManager对象的listen(PhoneStateListener listener, int events)//实现PhoneStateListener listener并实现相应的方法public class MyPhoneCallListener extends PhoneStateListener{@Overridepublic void onCallStateChanged(int state, String incomingNumber){switch (state) {case TelephonyManager.CALL_STATE_OFFHOOK:                   //电话通话的状态Toast.makeText(Main.this, "正在通话...", Toast.LENGTH_SHORT).show();break;case TelephonyManager.CALL_STATE_RINGING:                   //电话响铃的状态Toast.makeText(Main.this, incomingNumber, Toast.LENGTH_SHORT).show();break;}super.onCallStateChanged(state, incomingNumber);}

第一个参数需要实现PhoneStateListener listener并实现相应的方法，第二个参数是PhoneStateListener的静态常量，此处由于是监听电话状态，所以需要传入LISTEN_CALL_STATE，而同时也需要在AndroidManifest中注册相应的权限

<uses-permission android:name="android.permission.READ_PHONE_STATE" />