Android 来电监听

最近刚接到一个需求，为BOSS做一个来电显示功能，查找号码库显示姓名角色。

一、查找来电监听方法

PhoneStateListener监听器类，用于监视设备上特定电话状态的变化，包括服务状态、信号强度、消息等待指示器(语音邮件)等。

import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;public class MyPhoneStateListener extends PhoneStateListener {private static final String TAG = "MyPhoneStateListener";protected CallListener listener;/*** 返回电话状态** CALL_STATE_IDLE 无任何状态时* CALL_STATE_OFFHOOK 接起电话时* CALL_STATE_RINGING 电话响铃时*/@Overridepublic void onCallStateChanged(int state, String incomingNumber) {switch (state) {case TelephonyManager.CALL_STATE_IDLE:Log.d(TAG ,"电话挂断...");listener.onCallIdle();break;case TelephonyManager.CALL_STATE_OFFHOOK:Log.d(TAG ,"正在通话...");listener.onCallOffHook();break;case TelephonyManager.CALL_STATE_RINGING:Log.d(TAG ,"电话响铃...");listener.onCallRinging();break;}super.onCallStateChanged(state, incomingNumber);}//回调public void setCallListener(CallListener callListener) {this.listener = callListener;}//回调接口public interface CallListener {void onCallIdle();void onCallOffHook();void onCallRinging();}
}

TelephonyManager 提供对设备上电话服务的信息的访问。应用程序可以使用该类中的方法来确定电话服务和状态，以及访问某些类型的订阅者信息。应用程序还可以注册侦听器来接收电话状态更改的通知。

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import com.flymbp.callmonitor.MyPhoneStateListener;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);telephony();}private void telephony() {//获得相应的系统服务TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);if(tm != null) {try {MyPhoneStateListener myPhoneStateListener = new MyPhoneStateListener();myPhoneStateListener.setCallListener(new MyPhoneStateListener.CallListener() {@Overridepublic void onCallIdle() {}@Overridepublic void onCallOffHook() {}@Overridepublic void onCallRinging() {//走接口查询号码信息}});// 注册来电监听tm.listen(myPhoneStateListener, MyPhoneStateListener.LISTEN_CALL_STATE);} catch(Exception e) {// 异常捕捉}}}
}

此时此刻我们就可以监听到来电状态，但是incomingNumber没值，测试设备是华为mate20 pro Android 9.0
需要READ_CALL_LOG权限

     <!--读取电话的状态信息的权限--><uses-permission android:name="android.permission.READ_PHONE_STATE" /><!--读取通话记录的权限--><uses-permission android:name="android.permission.READ_CALL_LOG" />

Android 9 来电监听incomingNumber为空

拿到incomingNumber 我们就可以请求后台接口来获取号码信息，或者有本地号码数据库进行查找。

二、来电弹窗提示信息

来电号码信息有了，我们要在来电界面进行提示，既然不能对来电界面进行篡改，那我们就加个弹窗提示吧。
想到两种方式：
1、Toast提示，实现简单，但是显示时间短，不是主动触发，会错过看到提示，不采用。
2、悬浮窗提示，既然要在自身应用以外的界面上显示弹窗，那必然要使用悬浮窗。

我们将使用悬浮窗进行来电提示。为了让悬浮窗与Activity脱离，使其在应用处于后台时悬浮窗仍然可以正常运行，这里使用Service来启动悬浮窗。

来电时显示悬浮窗，点击悬浮窗可移除，拖拽悬浮窗可移动，接通或挂断移除悬浮窗，注意悬浮窗不要来一个电话显示一个弹窗。

public class FloatingButtonService extends Service {public static boolean isStarted = false;private WindowManager windowManager;private WindowManager.LayoutParams layoutParams;private Button button;private String content;@Overridepublic void onCreate() {super.onCreate();isStarted = true;windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);layoutParams = new WindowManager.LayoutParams();if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;} else {layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;}layoutParams.format = PixelFormat.RGBA_8888;layoutParams.gravity = Gravity.LEFT | Gravity.TOP;layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;layoutParams.width = 500;layoutParams.height = 100;layoutParams.x = 300;layoutParams.y = 300;}@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {content = intent.getStringExtra("content");int state = intent.getIntExtra("state", 0);switch (state) {case TelephonyManager.CALL_STATE_IDLE:removeFloating();break;case TelephonyManager.CALL_STATE_OFFHOOK:removeFloating();break;case TelephonyManager.CALL_STATE_RINGING:showFloatingWindow();break;}return super.onStartCommand(intent, flags, startId);}private void removeFloating() {if(button != null){windowManager.removeView(button);}}private void showFloatingWindow() {if(button != null){windowManager.removeView(button);}if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {if (Settings.canDrawOverlays(this)) {button = new Button(getApplicationContext());button.setText(content);button.setTextColor(Color.BLACK);button.setBackgroundColor(Color.WHITE);button.setOnTouchListener(new FloatingOnTouchListener());windowManager.addView(button, layoutParams);}} else {button = new Button(getApplicationContext());button.setText(content);button.setTextColor(Color.BLACK);button.setBackgroundColor(Color.WHITE);button.setOnTouchListener(new FloatingOnTouchListener());windowManager.addView(button, layoutParams);}}private class FloatingOnTouchListener implements View.OnTouchListener {private int x;private int y;private int clickx;private int clicky;@Overridepublic boolean onTouch(View view, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:x = (int) event.getRawX();y = (int) event.getRawY();clickx = x;clicky = y;break;case MotionEvent.ACTION_MOVE:int nowX = (int) event.getRawX();int nowY = (int) event.getRawY();int movedX = nowX - x;int movedY = nowY - y;x = nowX;y = nowY;layoutParams.x = layoutParams.x + movedX;layoutParams.y = layoutParams.y + movedY;windowManager.updateViewLayout(view, layoutParams);break;case MotionEvent.ACTION_UP:if (clickx == x && clicky == y)windowManager.removeView(button);break;default:break;}return false;}}
}

如何触发悬浮窗呢？

BroadcastReceiver使用广播来接收来电状态

在MainActivity.onCreate中注册广播

@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);BroadcastReceiver mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String data = intent.getStringExtra("data");showFloating(data);}};IntentFilter intentFilter = new IntentFilter("android.intent.action.MAIN");registerReceiver(mReceiver, intentFilter);
}public void showFloating(String mobile, int state) {Intent regIntent = new Intent(MainActivity.this, FloatingButtonService.class);regIntent.putExtra("content", mobile);regIntent.putExtra("state",state);startService(regIntent);
}

三、后台监听

来电监听我们不能总让应用在前台运行吧，这时需要后台运行进行监听。
需要把在MainActivity.telephony的方法写到服务里。

public class MyPhoneStateListenService extends Service {private static final String tag = "MyPhoneStateListenService";public static final String ACTION_REGISTER_LISTENER = "action_register_listener";// 电话管理者对象private TelephonyManager mTelephonyManager;// 电话状态监听者private MyPhoneStateListener myPhoneStateListener;@Overridepublic void onCreate() {mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);myPhoneStateListener = new MyPhoneStateListener(this);mTelephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);super.onCreate();}@Overridepublic IBinder onBind(Intent intent) {return null;}@Overridepublic void onDestroy() {// 取消来电的电话状态监听服务if (mTelephonyManager != null && myPhoneStateListener != null) {mTelephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_NONE);}super.onDestroy();}
}

在MainActivity.onCreate中开启服务

private void registerPhoneStateListener() {Intent intent = new Intent(this,  MyPhoneStateListenService.class);intent.setAction(MyPhoneStateListenService.ACTION_REGISTER_LISTENER);startService(intent);
}

四、进程保活

那么问题又来了，在后台服务很容易被杀，那我们就得考虑加入保活方案。
保活方案有很多，采用合适的方案，这里就不细说了。
常见的一些保活方案：
1、一像素保活
2、双进程守护
3、后台播放无声音乐
。。。