1.添加权限

<!--拨打电话的权限-->
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />

<!--电话拦截-->
<receiver android:name=".receiver.PhoneBroadcastReceiver">
    <intent-filter android:priority="1000">
        <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
        <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>
<!-- 电话拦截服务 -->

<service android:name="com.lvshandian.menshen.service.PhoneService">
    <intent-filter>
        <action android:name="com.xinwang.telesms.PhoneReciever"></action>
        <action android:name="com.xinwang.telesms.server.IMICHAT" />
    </intent-filter>
</service>

package com.lvshandian.menshen.receiver;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.telephony.TelephonyManager;
import android.util.Log;


import com.android.internal.telephony.ITelephony;
import com.lvshandian.menshen.service.PhoneService;

import java.lang.reflect.Method;
import java.util.ArrayList;

/**
 * Created by zhang on 2016/11/3.
 * 创建电话的监听
 */

public class PhoneBroadcastReceiver extends BroadcastReceiver {


    String TAG = "tag";
    TelephonyManager telMgr;

    @Override
    public void onReceive(Context context, Intent intent) {


        telMgr = (TelephonyManager) context.getSystemService(Service.TELEPHONY_SERVICE);
        switch (telMgr.getCallState()) {
            //来电
            case TelephonyManager.CALL_STATE_RINGING:
                String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
                Log.v(TAG, "number:" + number);
                Intent myintent = new Intent(context, PhoneService.class);
                myintent.setAction("com.lvshandian.menshen.service.PhoneReciever");
                context.startService(myintent);
//                if (!getPhoneNum(context).contains(number)) {
//                    SharedPreferences phonenumSP = context.getSharedPreferences("in_phone_num", Context.MODE_PRIVATE);
//                    SharedPreferences.Editor editor = phonenumSP.edit();
//                    editor.putString(number, number);
//                    editor.commit();
//                    endCall();
//                }
                break;
            //响铃
            case TelephonyManager.CALL_STATE_OFFHOOK:
                break;
            //挂断
            case TelephonyManager.CALL_STATE_IDLE:
                break;
        }

    }

    /**
     * 挂断电话
     */
    private void endCall() {
        Class<TelephonyManager> c = TelephonyManager.class;
        try {
            Method getITelephonyMethod = c.getDeclaredMethod("getITelephony", (Class[]) null);
            getITelephonyMethod.setAccessible(true);
            ITelephony iTelephony = null;
            Log.e(TAG, "End call.");
            iTelephony = (ITelephony) getITelephonyMethod.invoke(telMgr, (Object[]) null);
            iTelephony.endCall();
        } catch (Exception e) {
            Log.e(TAG, "Fail to answer ring call.", e);
        }
    }

    private ArrayList<String> getPhoneNum(Context context) {
        ArrayList<String> numList = new ArrayList<String>();
        //得到ContentResolver对象
        ContentResolver cr = context.getContentResolver();
        //取得电话本中开始一项的光标
        Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
        while (cursor.moveToNext()) {
            // 取得联系人ID
            String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
            Cursor phone = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
                    ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId, null, null);
            // 取得电话号码(可能存在多个号码)
            while (phone.moveToNext()) {
                String strPhoneNumber = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                numList.add(strPhoneNumber);
                Log.v("tag", "strPhoneNumber:" + strPhoneNumber);
            }

            phone.close();
        }
        cursor.close();
        return numList;
    }


}

//进行过滤对比电话

package com.lvshandian.menshen.service;

import java.lang.reflect.Method;
import java.util.List;

import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;

import com.android.internal.telephony.ITelephony;
import com.lvshandian.menshen.bean.PhoneBean;
import com.lvshandian.menshen.receiver.PhoneBroadcastReceiver;
import com.lvshandian.menshen.utils.TextUtils;
import com.lvshandian.menshen.utils.XUtils;

public class PhoneService extends Service {
    String TAG = "tag";
    TelephonyManager telManager;

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        telManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        telManager.listen(new MyPhoneStateListener(),
                PhoneStateListener.LISTEN_CALL_STATE);
    }

    /**
     * 挂断电话
     */
    private void endCall() {
        Class<TelephonyManager> c = TelephonyManager.class;
        try {
            Method getITelephonyMethod = c.getDeclaredMethod("getITelephony", (Class[]) null);
            getITelephonyMethod.setAccessible(true);
            ITelephony iTelephony = null;
            iTelephony = (ITelephony) getITelephonyMethod.invoke(telManager, (Object[]) null);
            iTelephony.endCall();
        } catch (Exception e) {
        }
    }

    private class MyPhoneStateListener extends PhoneStateListener {
        String phoneNumber;

        public void onCallStateChanged(int state, String incomingNumber) {
            switch (state) {
                case TelephonyManager.CALL_STATE_RINGING: /* 接通 */
                    phoneNumber = incomingNumber;
                    List<PhoneBean> list = XUtils.findAll(PhoneBean.class);
                    for (int i = 0; i < list.size(); i++) {
                        if (TextUtils.isString(list.get(i).getDnseg(), phoneNumber)) {
                            endCall();
                            break;
                        }
                    }

            }
            super.onCallStateChanged(state, incomingNumber);
        }

    }


    @Override
    public void onDestroy() {
        super.onDestroy();
        Intent localIntent = new Intent();
        localIntent.setClass(this, PhoneService.class); // 销毁时重新启动Service
        this.startService(localIntent);
    }

    private int flags;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_STICKY_COMPATIBILITY;
    }

    @Override
    public void onStart(Intent intent, int startId) {
// 再次动态注册广播
        IntentFilter localIntentFilter = new IntentFilter("android.intent.action.USER_PRESENT");
        localIntentFilter.setPriority(Integer.MAX_VALUE);// 整形最大值
        myReceiver searchReceiver = new myReceiver();
        registerReceiver(searchReceiver, localIntentFilter);
        super.onStart(intent, startId);
    }

    public class myReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            context.startService(new Intent(context, PhoneBroadcastReceiver.class));
        }
    }
}

Android 对电话进行监听和挂断