该代码检测到摇动/运动手势。我只需要它来检测来回抖动，在Moto智能手机中也称为“斩波”功能。 onSensorChanged方法需要一些工作。
尝试在shake_count方法上使用onSensorChanged变量，但是我想我错过了一些关键部分。
另外，如果加速度计传感器每次检测到所需的动作都暂停2秒，将会很有帮助。
public class MainActivity extends AppCompatActivity {
private Button button;
private boolean isFlashOn = false;
private Camera.Parameters params;
float shakeCount = 0;
Camera camera;
private SensorManager sm;
private float acelValue; // current acceleration value and gravity
private float acelLast; // last acceleration value and gravity
private float shake; // acceleration value differ from gravity
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sm.registerListener(
sensorListener,
sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL
);
acelValue = SensorManager.GRAVITY_EARTH;
acelLast = SensorManager.GRAVITY_EARTH;
shake = 0.00f;
button = (Button) findViewById(R.id.onSwitch);
}
boolean click = false;
public void onSwitchFunction(View view) {
if (click == false) {
button.setText("TURN OFF");
Toast toast = Toast.makeText(getApplicationContext(), "Shake Features On", Toast.LENGTH_LONG);
toast.show();
click = true;
} else if (click == true) {
button.setText("TURN ON");
Toast toast = Toast.makeText(getApplicationContext(), "Shake Features Off", Toast.LENGTH_LONG);
toast.show();
turnOffFlash();
click = false;
}
}
private final SensorEventListener sensorListener = new SensorEventListener() {
@Override
public void onSensorChanged(SensorEvent sensorEvent) {
float x = sensorEvent.values[0];
float y = sensorEvent.values[1];
float z = sensorEvent.values[2];
acelLast = acelValue;
acelValue = (float) Math.sqrt((double) (x * x + y * y + z * z));
float delta = acelValue - acelLast;
shake = shake + delta;
if (click) {
if (shake > 24) {
shakeCount++;
if (shakeCount > 1) {
shakeCount = 0;
Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
if (isFlashOn) {
turnOffFlash();
} else if (!isFlashOn) {
turnOnFlash();
}
vibrator.vibrate(300);
}
}
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
};
@TargetApi(Build.VERSION_CODES.M)
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void turnOffFlash() {
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String cameraId = cameraManager.getCameraIdList()[0];
cameraManager.setTorchMode(cameraId, false);
} catch (CameraAccessException e) {
}
isFlashOn = false;
}
@TargetApi(Build.VERSION_CODES.M)
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void turnOnFlash() {
CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
String cameraId = cameraManager.getCameraIdList()[0];
cameraManager.setTorchMode(cameraId, true);
} catch (CameraAccessException e) {
}
isFlashOn = true;
}
}
我希望代码能够检测到一系列震动事件，例如。仅检测设备是否摇动3次。理想的输出将检测来回的震动。
答案 0 :(得分：0)
检查此link，如果阈值超出限制并且 Z 值超过您提供的值，则应监视 Z 的值它将吐司消息。
public class ShakeActivity extends Activity implements SensorListener {
// For shake motion detection.
private SensorManager sensorMgr;
private long lastUpdate = -1;
private float x, y, z;
private float last_x, last_y, last_z;
private static final int SHAKE_THRESHOLD = 800;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// start motion detection
sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);
boolean accelSupported = sensorMgr.registerListener(this,
SensorManager.SENSOR_ACCELEROMETER,
SensorManager.SENSOR_DELAY_GAME);
if (!accelSupported) {
// on accelerometer on this device
sensorMgr.unregisterListener(this,
SensorManager.SENSOR_ACCELEROMETER);
}
}
protected void onPause() {
if (sensorMgr != null) {
sensorMgr.unregisterListener(this,
SensorManager.SENSOR_ACCELEROMETER);
sensorMgr = null;
}
super.onPause();
}
public void onAccuracyChanged(int arg0, int arg1) {
// TODO Auto-generated method stub
}
public void onSensorChanged(int sensor, float[] values) {
if (sensor == SensorManager.SENSOR_ACCELEROMETER) {
long curTime = System.currentTimeMillis();
// only allow one update every 100ms.
if ((curTime - lastUpdate) > 100) {
long diffTime = (curTime - lastUpdate);
lastUpdate = curTime;
x = values[SensorManager.DATA_X];
y = values[SensorManager.DATA_Y];
z = values[SensorManager.DATA_Z];
if(Round(x,4)>10.0000){
Log.d("sensor", "X Right axis: " + x);
Toast.makeText(this, "Right shake detected", Toast.LENGTH_SHORT).show();
}
else if(Round(x,4)<-10.0000){
Log.d("sensor", "X Left axis: " + x);
Toast.makeText(this, "Left shake detected", Toast.LENGTH_SHORT).show();
}else if(Round(z,4)>10.0000){
Log.d("sensor", "Z Up axis: " + z);
Toast.makeText(this, "Up shake detected", Toast.LENGTH_SHORT).show();
}
else if(Round(z,4)<-10.0000){
Log.d("sensor", "Z Down axis: " + z);
Toast.makeText(this, "Down shake detected", Toast.LENGTH_SHORT).show();
float speed = Math.abs(x+y+z - last_x - last_y - last_z) / diffTime * 10000;
// Log.d("sensor", "diff: " + diffTime + " - speed: " + speed);
if (speed > SHAKE_THRESHOLD) {
//Log.d("sensor", "shake detected w/ speed: " + speed);
//Toast.makeText(this, "shake detected w/ speed: " + speed, Toast.LENGTH_SHORT).show();
}
last_x = x;
last_y = y;
last_z = z;
}
}
}
public static float Round(float Rval, int Rpl) {
float p = (float)Math.pow(10,Rpl);
Rval = Rval * p;
float tmp = Math.round(Rval);
return (float)tmp/p;
}
}