Android 來電監聽

最近剛接到一個需求，爲BOSS做一個來電顯示功能，查找號碼庫顯示姓名角色。

一、查找來電監聽方法

PhoneStateListener監聽器類，用於監視設備上特定電話狀態的變化，包括服務狀態、信號強度、消息等待指示器(語音郵件)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;
    /**
     * 返回電話狀態
     *
     * CALL_STATE_IDLE 無任何狀態時
     * CALL_STATE_OFFHOOK 接起電話時
     * CALL_STATE_RINGING 電話響鈴時
     */
    @Override
    public void onCallStateChanged(int state, String incomingNumber) {
        switch (state) {
            case TelephonyManager.CALL_STATE_IDLE:
                Log.d(TAG ,"電話掛斷...");
                listener.onCallIdle();
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                Log.d(TAG ,"正在通話...");
                listener.onCallOffHook();
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                Log.d(TAG ,"電話響鈴...");
                listener.onCallRinging();
                break;
        }
        super.onCallStateChanged(state, incomingNumber);
    }

    //回調
    public void setCallListener(CallListener callListener) {
        this.listener = callListener;
    }

    //回調接口
    public interface CallListener {
        void onCallIdle();
        void onCallOffHook();
        void onCallRinging();
    }
}

TelephonyManager 提供對設備上電話服務的信息的訪問。應用程序可以使用該類中的方法來確定電話服務和狀態，以及訪問某些類型的訂閱者信息。應用程序還可以註冊偵聽器來接收電話狀態更改的通知。

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 {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        telephony();
    }

    private void telephony() {
        //獲得相應的系統服務
        TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        if(tm != null) {
            try {
                MyPhoneStateListener myPhoneStateListener = new MyPhoneStateListener();
                myPhoneStateListener.setCallListener(new MyPhoneStateListener.CallListener() {
                    @Override
                    public void onCallIdle() {
                    }

                    @Override
                    public void onCallOffHook() {
                    }

                    @Override
                    public void onCallRinging() {
                    //走接口查詢號碼信息
                    }
                });
                // 註冊來電監聽
                tm.listen(myPhoneStateListener, MyPhoneStateListener.LISTEN_CALL_STATE);
            } catch(Exception e) {
                // 異常捕捉
            }
        }
    }
}

此時此刻我們就可以監聽到來電狀態，但是incomingNumber沒值，測試設備是華爲mate20 pro Android 9.0
需要READ_CALL_LOG權限

  	<!--讀取電話的狀態信息的權限-->
    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <!--讀取通話記錄的權限-->
    <uses-permission android:name="android.permission.READ_CALL_LOG" />

Android 9 來電監聽incomingNumber爲空

拿到incomingNumber 我們就可以請求後臺接口來獲取號碼信息，或者有本地號碼數據庫進行查找。

二、來電彈窗提示信息

來電號碼信息有了，我們要在來電界面進行提示，既然不能對來電界面進行篡改，那我們就加個彈窗提示吧。
想到兩種方式：
1、Toast提示，實現簡單，但是顯示時間短，不是主動觸發，會錯過看到提示，不採用。
2、懸浮窗提示，既然要在自身應用以外的界面上顯示彈窗，那必然要使用懸浮窗。

我們將使用懸浮窗進行來電提示。爲了讓懸浮窗與Activity脫離，使其在應用處於後臺時懸浮窗仍然可以正常運行，這裏使用Service來啓動懸浮窗。

來電時顯示懸浮窗，點擊懸浮窗可移除，拖拽懸浮窗可移動，接通或掛斷移除懸浮窗，注意懸浮窗不要來一個電話顯示一個彈窗。

public class FloatingButtonService extends Service {
    public static boolean isStarted = false;

    private WindowManager windowManager;
    private WindowManager.LayoutParams layoutParams;

    private Button button;
    private String content;

    @Override
    public 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
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public 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;

        @Override
        public 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;
        }
    }
}

如何觸發懸浮窗呢？

BroadcastReceiver使用廣播來接收來電狀態

在MainActivity.onCreate中註冊廣播

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	BroadcastReceiver mReceiver = new BroadcastReceiver() {
	@Override
    public 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、後臺監聽

來電監聽我們不能總讓應用在前臺運行吧，這時需要後臺運行進行監聽。
需要把在MainActivity.telephony的方法寫到服務裏。

public class MyPhoneStateListenService extends Service {
    private static final String tag = "MyPhoneStateListenService";
    public static final String ACTION_REGISTER_LISTENER = "action_register_listener";
    // 電話管理者對象
    private TelephonyManager mTelephonyManager;
    // 電話狀態監聽者
    private MyPhoneStateListener myPhoneStateListener;

    @Override
    public void onCreate() {
        mTelephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        myPhoneStateListener = new MyPhoneStateListener(this);
        mTelephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_CALL_STATE);
        super.onCreate();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onDestroy() {
        // 取消來電的電話狀態監聽服務
        if (mTelephonyManager != null && myPhoneStateListener != null) {
            mTelephonyManager.listen(myPhoneStateListener, PhoneStateListener.LISTEN_NONE);
        }
        super.onDestroy();
    }
}

在MainActivity.onCreate中開啓服務

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

四、進程保活

那麼問題又來了，在後臺服務很容易被殺，那我們就得考慮加入保活方案。
保活方案有很多，採用合適的方案，這裏就不細說了。
常見的一些保活方案：
1、一像素保活
2、雙進程守護
3、後臺播放無聲音樂
。。。