package cn.yj3g.L21_PhoneListener;
import java.lang.reflect.Method;
import com.android.internal.telephony.ITelephony;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.Environment;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Toast;
public class PhoneListenerService extends Service {
  private MediaRecorder recorder;
  private boolean recording = false;
  @Override
  public IBinder onBind(Intent intent) {
    return null;
  }
  @Override
  public void onCreate() {
    Log.v("TAG", "service onCreate()");
    super.onCreate();
    //电话服务管理
    TelephonyManager manager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
    //监听电话状态
    manager.listen(listener, PhoneStateListener.LISTEN_CALL_STATE);
  }
  private PhoneStateListener listener = new PhoneStateListener() {
    /*
     * @see TelephonyManager#CALL_STATE_IDLE 值为0
     *
     * @see TelephonyManager#CALL_STATE_RINGING 值为1
     *
     * @see TelephonyManager#CALL_STATE_OFFHOOK 值为2
    */
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
      super.onCallStateChanged(state, incomingNumber);
      //打印电话状态改变信息
      Log.v("TAG", "onCallStateChanged state=" + state);
      switch (state) {
      case TelephonyManager.CALL_STATE_IDLE: // 没有来电 或者 挂断
        stopRecord();
        break;
      case TelephonyManager.CALL_STATE_RINGING: // 响铃时
        stop(incomingNumber);
        break;
      case TelephonyManager.CALL_STATE_OFFHOOK: // 接起电话
        recordCalling();
        break;
      default:
        break;
      }
    }
  };
  //停止录音
  private void stopRecord() {
    Log.v("TAG", "stopRecord");
    if (recording) {
      recorder.stop();
      recorder.release();
      recording=false;
    }
  }
  //电话拦截
  public void stop(String s) {
    try {
      if (s.equals("110")) {
        Toast.makeText(this, "拦截成功", 0).show();
        Log.e("TAG", "此来电为黑名单号码，已被拦截！");
        //调用ITelephony.endCall()结束通话
        Method method = Class.forName("android.os.ServiceManager")
            .getMethod("getService", String.class);
        IBinder binder = (IBinder) method.invoke(null,
            new Object[] { TELEPHONY_SERVICE });
        ITelephony telephony = ITelephony.Stub.asInterface(binder);
        telephony.endCall();
      } else
        Toast.makeText(this, "不需拦截", 0).show();
      recording=false;
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  //进行录音
  private void recordCalling() {
    try {
      Log.v("TAG", "recordCalling");
      recorder = new MediaRecorder();
      recorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 读麦克风的声音
      recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);// 输出格式.3gp
      recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);// 编码方式
      recorder.setOutputFile(Environment.getExternalStorageDirectory()
          .getAbsolutePath()
          + "/"
          + System.currentTimeMillis()
          + ".3gp");// 存放的位置是放在sdcard目录下
      recorder.prepare();
      recorder.start();
      recording = true;
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

com/android/internal/telephony/ITelephony.aidl
android/telephony/NeighboringCellInfo.aidl

package cn.yj3g.L21_PhoneListener;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class BootCompleteReceiver extends BroadcastReceiver {
  @Override
  public void onReceive(Context context, Intent intent) {
    //运用广播开启监听这个服务
    Log.v("TAG", "开机了!");
      Intent i = new Intent(context, PhoneListenerService.class);
      i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//由于之前运行不能实现功能，经老师的修改加上一个任务标志
      context.startService(i);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="cn.yj3g.L21_PhoneListener"
   android:versionCode="1"
   android:versionName="1.0">
  <uses-sdk android:minSdkVersion="8" />
  <application android:icon="@drawable/icon" android:label="@string/app_name">
    <service android:name=".PhoneListenerService">
      <intent-filter>
       <action android:name="cn.yj3g.L21_PhoneListener.PhoneListenerService" ></action>
      </intent-filter>
    </service>
    <receiver android:name=".BootCompleteReceiver">
      <intent-filter>
       <action android:name="android.intent.action.BOOT_COMPLETED" />
      </intent-filter>
    </receiver>
  </application>
   <!-- 读取电话状态权限-->
  <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
   <!-- 录音权限 -->
  <uses-permission android:name="android.permission.RECORD_AUDIO"/>
  <!-- 向sdcard中写数据的权限 -->
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  <!-- 开机启动广播的权限 -->
  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
  <!-- 挂断电话时需要的权限 -->
   <uses-permission android:name="android.permission.CALL_PHONE" />
</manifest>