当来电振铃时如何使手电筒闪烁并在振铃结束时停止闪烁闪烁？

Question

我希望在手机响铃时闪烁我的Android手机闪光灯，并且在响铃时间结束，拒绝接听电话或接听电话时应停止闪光灯闪烁。

我使用过广播接收器，但效果不佳。

Answer 1

public class PhoneCallReceiver extends BroadcastReceiver {
    TelephonyManager telephony;
    SharedPreferences sp;
    PhoneCallStateListener customPhoneListener;
    boolean entered = false;
    AudioManager audioManager;
    Camera camera;
    Camera.Parameters params;

    @Override
    public void onReceive(Context context, Intent intent) {
        sp = context.getSharedPreferences("flash_setings", 0);
        telephony =
                (TelephonyManager)
                        context.getSystemService(Context.TELEPHONY_SERVICE);
        customPhoneListener = new PhoneCallStateListener(context);
        telephony.listen(customPhoneListener,
                PhoneStateListener.LISTEN_CALL_STATE);
    }

    public class
    PhoneCallStateListener extends PhoneStateListener {
        private Context
                context;
        Timer timer;
        TimerTask timerTask;

        public PhoneCallStateListener(Context context) {
            this.context = context;
        }

        @Override
        public void onCallStateChanged(final int state, String
                incomingNumber) {
            switch (state) {
                case TelephonyManager.CALL_STATE_RINGING:
                    Log.d("STATE", "CALL_STATE_RINGING");
                    Log.d("ringing state",
                            "ringing");
                    TelephonyManager telephonyManager = (TelephonyManager)
                            context.getSystemService(Context.TELEPHONY_SERVICE);
                    try {
                        Class
                                clazz = Class.forName(telephonyManager.getClass().getName());
                        Method
                                method = clazz.getDeclaredMethod("getITelephony");
                        method.setAccessible(true);
                        ITelephony telephonyService =
                                (ITelephony) method.invoke(telephonyManager); // Checking incoming
                        call number //System.out.println("Call " + block_number); if
                        (sp.getBoolean("isenabled", true) == true) {
                            if (entered == false) {
                                entered = true;
                                Log.d("SOUND OFF :" +
                                        sp.getBoolean("flash_only_isenabled", false) + "", "");
                                if
                                        (sp.getBoolean("flash_only_isenabled", false) == true) {
                                    Log.d("SOUND OFF :" + sp.getBoolean("flash_only_isenabled", false) +
                                            "", "");
                                    audioManager = (AudioManager)
                                            context.getSystemService(Context.AUDIO_SERVICE);
                                    audioManager.setStreamMute(AudioManager.STREAM_RING, true);
                                } else {
                                    Log.d("SOUND", "ON");
                                    audioManager = (AudioManager)
                                            context.getSystemService(Context.AUDIO_SERVICE);
                                    audioManager.setStreamMute(AudioManager.STREAM_RING, false);
                                }
                                if
                                        (sp.getBoolean("flash_ring_isenabled", false) == true) {
                                }
                                if
                                        (camera == null) {
                                    try {
                                        Log.d("Camera ", "interval " +
                                                sp.getInt("flash_interval", 1) * 1000);
                                        String myString =
                                                "010101010101010101010101";
                                        long blinkDelay =
                                                sp.getInt("flash_interval", 1) * 1000;
                                        for (int i = 0; i <
                                                myString.length(); i++) {
                                            if (myString.charAt(i) == '0') {
                                                camera =
                                                        Camera.open();
                                                params = camera.getParameters();
                                                params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
                                                camera.setParameters(params);
                                                camera.startPreview();
                                                camera.stopPreview();
                                                camera.release();
                                                camera = null;
                                                try {
                                                    Thread.sleep(blinkDelay);
                                                } catch (InterruptedException e) {
                                                    e.printStackTrace();
                                                }
                                            } else {
                                                camera = Camera.open();
                                                params =
                                                        camera.getParameters();
                                                params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                                                camera.setParameters(params);
                                                camera.startPreview();
                                                camera.stopPreview();
                                                camera.release();
                                                camera = null;
                                            }
                                        } 
                                    } catch (Exception e) {
                                        if
                                                (camera != null) {
                                            camera.stopPreview();
                                            camera.release();
                                            camera =
                                                    null;
                                        }
                                    }
                                }
                            }
                        }
                    } catch (Exception e) { //Toast.makeText(context,
                        e.toString(), Toast.LENGTH_LONG).show();
                    } break;
                case TelephonyManager.CALL_STATE_IDLE:
                    Log.d("STATE", "CALL_STATE_IDLE");
                    break;
                case TelephonyManager.CALL_STATE_OFFHOOK:
                    Log.d("STATE", "CALL_STATE_OFFHOOK");
                    break;
            }
            super.onCallStateChanged(state, incomingNumber);
            telephony.listen(customPhoneListener,
                    PhoneStateListener.LISTEN_NONE);
        }
    }
}