原理:手機系統有感測器,呼叫手機感測器,並讓手機振動

public abstract class ShakeListener implements SensorEventListener{

    private int duration = 100;//取樣時間間隔
private long lastTime;
    private float lastPointX;//上一個點的x軸的加速度資訊
private float lastPointY;
    private float lastPointZ;
    private float shake;//單次增量
private float totalShake
 
;//總增量
private float swithValue = 100;//判斷是否搖晃手機的最大值
public ShakeListener(){
        init();
}

    private void init(){
        lastTime = 0;
lastPointX = 0;
lastPointY = 0;
lastPointZ = 0;
shake = 0;
totalShake = 0;
}

    @Override
public void onSensorChanged(SensorEvent event) {
        if(lastTime == 0){
            lastTime 
 
= System.currentTimeMillis();
lastPointX = event.values[SensorManager.DATA_X];
lastPointY = event.values[SensorManager.DATA_Y];
lastPointZ = event.values[SensorManager.DATA_Z];
}else{
            long currentTime = System.currentTimeMillis();
            if(currentTime - lastTime > duration){
                //第二個點
 
float x = event.values[SensorManager.DATA_X];
                float y = event.values[SensorManager.DATA_Y];
                float z = event.values[SensorManager.DATA_Z];
//每次傳入的資料都存在微小的變動
float dx = Math.abs(x - lastPointX);
                float dy = Math.abs(y - lastPointY);
                float dz = Math.abs(z - lastPointZ);
                if(dx < 1){
                    dx = 0;
}

                if(dy < 1){
                    dy = 0;
}

                if(dz <1){
                    dz = 0;
}
                shake = dx + dy + dz;
                if(shake == 0){
                    //處於靜止狀態
init();
}

                totalShake += shake;
                if(totalShake > swithValue){
                    //說明是在搖晃手機
                    //機選一注彩票，並且有震動
shakeCrateLottery();
init();
}else{
                    lastTime = System.currentTimeMillis();
lastPointX = event.values[SensorManager.DATA_X];
lastPointY = event.values[SensorManager.DATA_Y];
lastPointZ = event.values[SensorManager.DATA_Z];
}

            }
        }
    }

    @Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    public abstract void shakeCrateLottery();
}