Flashlight By Shaking Hand

Flashlight By Shaking Hand

FLASH源码

1.0.0

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手电筒握手！

开发人员：工程师SAAD
电子邮件：[email protected]
网站：https：//engr-saad.com
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公司网络：https：//triangletech.com.bd/
WhatsApp：+8801810536303

概括

该项目的基础由典型的Android智能手机与相机一起提供。在看到该游戏商店有许多要求不必要的权限的应用程序之后，我决定创建一个无需任何类型的许可即可切换LED的应用程序。该应用程序还实施了一个检测设备震动何时的服务（用于切换手电筒）。

截至2020年1月3日，手电筒已在Apache许可证版本2.0下获得许可。

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源代码（zip）：flashlight.zip

代码

代码的大部分用Java编写，很简单。用于检测摇动运动：声明全局变量：

    SensorManager sensorManager = null ;
    public static final float SHAKE_THRESHOLD = 10.25f ; // How hard should user shake to invoke the service
    public static final int MIN_TIME_BETWEEN_SHAKES = 1000 ;
    private long lastShakeTime = 0 ;
    private boolean isFlashlightOn = false ;

初始化Sensormanager：

    sensorManager = ( SensorManager ) getSystemService ( SENSOR_SERVICE );
    if ( sensorManager != null ) {
        Sensor accelerometer = sensorManager . getDefaultSensor ( Sensor . TYPE_ACCELEROMETER );
        sensorManager . registerListener (( SensorEventListener ) this , accelerometer , SensorManager . SENSOR_DELAY_NORMAL );
    }

使类实施SensoreVentListener接口并覆盖它是Onsensorchanged方法：

      @ Override
    public void onSensorChanged ( SensorEvent event ) {
        if ( event . sensor . getType () == Sensor . TYPE_ACCELEROMETER ) {
            long curTime = System . currentTimeMillis ();
            if (( curTime - lastShakeTime ) > MIN_TIME_BETWEEN_SHAKES ) {

                float x = event . values [ 0 ];
                float y = event . values [ 1 ];
                float z = event . values [ 2 ];

                double acceleration = Math . sqrt ( Math . pow ( x , 2 ) +
                        Math . pow ( y , 2 ) +
                        Math . pow ( z , 2 )) - SensorManager . GRAVITY_EARTH ;

                if ( acceleration > SHAKE_THRESHOLD ) {
                    lastShakeTime = curTime ;
                    if (! isFlashlightOn ) {
                        torchToggle ( "on" );
                        isFlashlightOn = true ;
                    }
                    else {
                        torchToggle ( "off" );
                        isFlashlightOn = false ;
                    }
                }
            }
        }

创建一个函数torchtoggle（字符串命令）：

    private void torchToggle ( String command ) {
        if ( Build . VERSION . SDK_INT >= Build . VERSION_CODES . M ) {
            CameraManager camManager = ( CameraManager ) getSystemService ( Context . CAMERA_SERVICE );
            String cameraId = null ; // Usually back camera is at 0 position.
            try {
                if ( camManager != null ) {
                    cameraId = camManager . getCameraIdList ()[ 0 ];
                }
                if ( camManager != null ) {
                    if ( command . equals ( "on" )) {
                        camManager . setTorchMode ( cameraId , true );   // Turn ON
                        isFlashlightOn = true ;
                    } else {
                        camManager . setTorchMode ( cameraId , false );  // Turn OFF
                        isFlashlightOn = false ;
                    }
                }
            } catch ( CameraAccessException e ) {
                e . getMessage ();
            }
        }
    }