Android 四大组件之 Service_5

基于上一篇挂断电话：https://blog.csdn.net/whjk20/article/details/112916480，实现拦截给定的电话号码。

一、功能描述

二、过程分析

三、相关API

1. TelephonyManager: 电话服务的管理器，

2. PhoneStateListener：电话状态监听器

四、代码实现

1. 创建一个Service, 用于监听电话状态。

2. Service 创建回调onCreate时，创建TelephonyManager/ TelecomManager 对象，并注册电话状态监听，以及初始化黑名单列表

3. 电话状态改变时，处理拦截挂断

4.完整代码

一、功能描述

当前手机保存一些黑名单电话号码
当来电时，如果是黑名单号码，则自动挂断

二、过程分析

启动服务
在服务中监听电话状态
当电话状态是响铃时，判断是否为黑名单号码
如果是，挂断电话

三、相关API

1. TelephonyManager: 电话服务的管理器，

获取它的对象： context.getSystemService(TELEPHONY_SERVICE)
监听电话状态：telephonyManager.listen(mListener, PhoneStateListener.LISTEN_CALL_STATE)

注意：当解除接听的时候，需要传事件： PhoneStateListener.LISTEN_NONE

2. PhoneStateListener：电话状态监听器

电话状态改变的回调方法： onCallStateChanged(int state, String phoneNumber)
电话状态(TelephonyManager 定义) : CALL_STATE_IDLE（初始状态） , CALL_STATE_RINGING（响铃）, CALL_STATE_OFFHOOK（通话中）

注意：需要应用程序拥有 android.permission.READ_CALL_LOG 权限，否则回调中的 phoneNumber 是为空的。

因此，不仅AndroidManifest 中需要声明使用这个权限，而且应用程序启动时，提示用户打开 “电话记录” 的权限。（毕竟权限的目的也是为了提醒用户，可能会用到一些隐私信息）

     * @param state call state* @param phoneNumber call phone number. If application does not have* {@link android.Manifest.permission#READ_CALL_LOG READ_CALL_LOG} permission or carrier* privileges (see {@link TelephonyManager#hasCarrierPrivileges}), an empty string will be* passed as an argument.*/public void onCallStateChanged(@CallState int state, String phoneNumber) {// default implementation empty}

四、代码实现

1. 创建一个Service, 用于监听电话状态。

public class ListenCallService extends Service

2. Service 创建回调onCreate时，创建TelephonyManager/ TelecomManager 对象，并注册电话状态监听，以及初始化黑名单列表

//注册监听
mTelephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
mTelephonyManager.listen(mListener, PhoneStateListener.LISTEN_CALL_STATE);
private PhoneStateListener mListener = new PhoneStateListener() {...}

mTelecomManager = (TelecomManager) getSystemService(TELECOM_SERVICE);

//add block number
mBlockNumberList.add("10086");

3. 电话状态改变时，处理拦截挂断

@Override
public void onCallStateChanged(int state, String phoneNumber) {
super.onCallStateChanged(state, phoneNumber);
if (state == TelephonyManager.CALL_STATE_RINGING && isBlockNumber(phoneNumber)) {
boolean ret = mTelecomManager.endCall();
}
}

4.完整代码

package com.example.endcallremoteservice;import android.Manifest;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.IBinder;
import android.telecom.TelecomManager;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;import java.util.ArrayList;
import java.util.List;public class ListenCallService extends Service {private static final String TAG = "ListenCallService";private Context mContext;private TelephonyManager mTelephonyManager;private TelecomManager mTelecomManager;private List<String> mBlockNumberList = new ArrayList<>();private PhoneStateListener mListener = new PhoneStateListener() {@RequiresApi(api = Build.VERSION_CODES.P)@Overridepublic void onCallStateChanged(int state, String phoneNumber) {super.onCallStateChanged(state, phoneNumber);log("onCallStateChanged state=" + state + ", phoneNumber=" + phoneNumber);if (state == TelephonyManager.CALL_STATE_RINGING && isBlockNumber(phoneNumber)) {if (mContext.checkSelfPermission(Manifest.permission.ANSWER_PHONE_CALLS) != PackageManager.PERMISSION_GRANTED) {// TODO: Consider calling//    ActivityCompat#requestPermissions// here to request the missing permissions, and then overriding//   public void onRequestPermissionsResult(int requestCode, String[] permissions,//                                          int[] grantResults)// to handle the case where the user grants the permission. See the documentation// for ActivityCompat#requestPermissions for more details.log("onCallStateChanged - no ANSWER_PHONE_CALLS permission");return;}boolean ret = mTelecomManager.endCall();log("onCallStateChanged endCall ret=" + ret);}}};private boolean isBlockNumber(String phoneNumber) {if (phoneNumber == null) {return false;}for (String number : mBlockNumberList) {if (phoneNumber.equals(number)) {return true;}}return false;}@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)@Overridepublic void onCreate() {super.onCreate();log("onCreate");mContext = this;mTelephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);//监听mTelephonyManager.listen(mListener, PhoneStateListener.LISTEN_CALL_STATE);mTelecomManager = (TelecomManager) getSystemService(TELECOM_SERVICE);//add block numbermBlockNumberList.add("10086");if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {if (mContext.checkSelfPermission(Manifest.permission.READ_CALL_LOG) != PackageManager.PERMISSION_GRANTED) {log("onCreate - do not grant permission.READ_CALL_LOG ");} else {log("onCreate - already granted permission.READ_CALL_LOG ");}}}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {log("onStartCommand");return super.onStartCommand(intent, flags, startId);}@Nullable@Overridepublic IBinder onBind(Intent intent) {log("onCreate");return null;}@Overridepublic boolean onUnbind(Intent intent) {log("onUnbind");return super.onUnbind(intent);}@Overridepublic void onDestroy() {super.onDestroy();log("onDestroy");//解除监听mTelephonyManager.listen(mListener, PhoneStateListener.LISTEN_NONE);}private void log(String msg) {Log.d(TAG, msg);}
}

AndroidManifest 使用的权限

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

五、输出结果：

//启动来电监听
2021-01-22 16:21:20.891 9188-9188/com.example.endcallremoteservice D/MainActivity: clicked button to enablePhoneListener
2021-01-22 16:21:20.899 9188-9188/com.example.endcallremoteservice D/ListenCallService: onCreate
2021-01-22 16:21:20.906 9188-9188/com.example.endcallremoteservice D/ListenCallService: onCreate - already granted permission.READ_CALL_LOG
2021-01-22 16:21:20.906 9188-9188/com.example.endcallremoteservice D/ListenCallService: onStartCommand
2021-01-22 16:21:20.908 9188-9188/com.example.endcallremoteservice D/ListenCallService: onCallStateChanged state=0, phoneNumber=//拦截来电
2021-01-22 16:21:51.007 9188-9188/com.example.endcallremoteservice D/ListenCallService: onCallStateChanged state=1, phoneNumber=10086
2021-01-22 16:21:51.013 9188-9188/com.example.endcallremoteservice D/ListenCallService: onCallStateChanged endCall ret=true
2021-01-22 16:21:51.341 9188-9188/com.example.endcallremoteservice D/ListenCallService: onCallStateChanged state=0, phoneNumber=10086//停止监听
2021-01-22 16:22:21.003 9188-9188/com.example.endcallremoteservice D/MainActivity: clicked button to stopPhoneListener
2021-01-22 16:22:21.011 9188-9188/com.example.endcallremoteservice D/ListenCallService: onDestroy