小弟我写个类PhoneReceiver继承BroadcastReceiver，怎么使用Toast来显示消息框

我写个类PhoneReceiver继承BroadcastReceiver，如何使用Toast来显示消息框？
我写个类PhoneReceiver继承BroadcastReceiver，如何使用Toast来显示消息框？
它的第一个参数类型是Context,用this不行，怎么写第一个参数？谢谢~~~

package com.example.phone;


import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.telephony.TelephonyManager;

import android.util.Log;

import android.widget.Toast;


public class PhoneReceiver extends BroadcastReceiver {

	public final static String TAG = "MyBroadcastReceiver";


	@Override

	public void onReceive(Context context, Intent intent) {

		String action = intent.getAction();

		Log.i(TAG, "[Broadcast]" + action);


		if (action.equals(Intent.ACTION_NEW_OUTGOING_CALL)) {// 呼出电话

			String outPhoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);

			Log.i(TAG, "[Broadcast]ACTION_NEW_OUTGOING_CALL:" + outPhoneNumber);

			Toast.makeText(null, "ACTION_NEW_OUTGOING_CALL:" + outPhoneNumber, Toast.LENGTH_LONG).show();

		} else {

			String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

			String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);

			Log.d(TAG, "Incomng Number: " + number);


			if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_RINGING)) {// 电话正在响铃

				Log.d(TAG,"来电"+number+"EXTRA_STATE_RINGING 正在响起~~~");

			}

			else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE)) {// 待机中

				Log.d(TAG,"EXTRA_STATE_IDLE 空闲");

				Toast.makeText(null, "EXTRA_STATE_IDLE 空闲", Toast.LENGTH_LONG).show();

			}

			else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_OFFHOOK)) {// 拨号或通讯中

				Log.d(TAG,"EXTRA_STATE_OFFHOOK 摘机");

				Toast.makeText(null, "EXTRA_STATE_OFFHOOK 摘机", Toast.LENGTH_LONG).show();

			}

		}

	}

}

------解决思路----------------------

package com.example.phone;


import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.telephony.TelephonyManager;

import android.util.Log;

import android.widget.Toast;


public class PhoneReceiver extends BroadcastReceiver {

	public final static String TAG = "MyBroadcastReceiver";


	@Override

	public void onReceive(Context context, Intent intent) {

		String action = intent.getAction();

		Log.i(TAG, "[Broadcast]" + action);


		if (action.equals(Intent.ACTION_NEW_OUTGOING_CALL)) {// 呼出电话

			String outPhoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);

			Log.i(TAG, "[Broadcast]ACTION_NEW_OUTGOING_CALL:" + outPhoneNumber);

			Toast.makeText(context, "ACTION_NEW_OUTGOING_CALL:" + outPhoneNumber, Toast.LENGTH_LONG).show();

		} else {

			String state = intent.getStringExtra(TelephonyManager.EXTRA_STATE);

			String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);

			Log.d(TAG, "Incomng Number: " + number);


			if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_RINGING)) {// 电话正在响铃

				Log.d(TAG,"来电"+number+"EXTRA_STATE_RINGING 正在响起~~~");

			}

			else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_IDLE)) {// 待机中

				Log.d(TAG,"EXTRA_STATE_IDLE 空闲");

				Toast.makeText(context, "EXTRA_STATE_IDLE 空闲", Toast.LENGTH_LONG).show();

			}

			else if (state.equalsIgnoreCase(TelephonyManager.EXTRA_STATE_OFFHOOK)) {// 拨号或通讯中

				Log.d(TAG,"EXTRA_STATE_OFFHOOK 摘机");

				Toast.makeText(context, "EXTRA_STATE_OFFHOOK 摘机", Toast.LENGTH_LONG).show();

			}

		}

	}

}