上文通过TelephonyManager获取了手机网络、SIM卡的相关信息，在本文中通过监听TelephonyManager的通话状态来监听手机的所有来电，代码如下：
- package com.guyun.activity;
- import com.guyun.listenphonestate.R;
- import android.app.Activity;
- import android.os.Bundle;
- import android.telephony.PhoneStateListener;
- import android.telephony.TelephonyManager;
- import android.widget.Toast;
- public class PhoneStateActivity extends Activity {
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- // 获取系统服务（电话管理器）
- TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
- // 创建电话状态改变的监听器
- PhoneStateListener phoneListener = new PhoneStateListener() {
- // 当来电状态改变时触发
- @Override
- public void onCallStateChanged(int state, String incomingNumber) {
- super.onCallStateChanged(state, incomingNumber);
- switch (state) {
- // 无任何状态
- case TelephonyManager.CALL_STATE_IDLE:
- Toast.makeText(PhoneStateActivity.this, "无任何状态",
- Toast.LENGTH_LONG).show();
- break;
- // 接通电话状态
- case TelephonyManager.CALL_STATE_OFFHOOK:
- Toast.makeText(PhoneStateActivity.this, "电话已接通",
- Toast.LENGTH_LONG).show();
- break;
- // 来电状态
- case TelephonyManager.CALL_STATE_RINGING:
- Toast.makeText(PhoneStateActivity.this,
- "来电显示：" + incomingNumber, Toast.LENGTH_LONG).show();
- break;
- }
- }
- };
- // 为TelephonyManager注册监听器
- tm.listen(phoneListener, PhoneStateListener.LISTEN_CALL_STATE);
- }
- }