我需要添加一个摇功能,将刷新我的Android应用程序。
我所找到的所有文档都涉及实现SensorListener,但Eclipse告诉我它已被弃用,并建议使用SensorEventListener。
有人知道如何创建这个震动控制器吗?
我需要添加一个摇功能,将刷新我的Android应用程序。
我所找到的所有文档都涉及实现SensorListener,但Eclipse告诉我它已被弃用,并建议使用SensorEventListener。
有人知道如何创建这个震动控制器吗?
当前回答
我写了一个检测垂直和水平震动并显示Toast的小例子。
public class Accelerometerka2Activity extends Activity implements SensorEventListener {
private float mLastX, mLastY, mLastZ;
private boolean mInitialized;
private SensorManager mSensorManager;
private Sensor mAccelerometer;
private final float NOISE = (float) 8.0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mInitialized = false;
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mSensorManager.registerListener(this, mAccelerometer , SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// can be safely ignored for this demo
}
public void onSensorChanged(SensorEvent event) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
if (!mInitialized) {
mLastX = x;
mLastY = y;
mLastZ = z;
mInitialized = true;
} else {
float deltaX = Math.abs(mLastX - x);
float deltaY = Math.abs(mLastY - y);
float deltaZ = Math.abs(mLastZ - z);
if (deltaX < NOISE) deltaX = (float)0.0;
if (deltaY < NOISE) deltaY = (float)0.0;
if (deltaZ < NOISE) deltaZ = (float)0.0;
mLastX = x;
mLastY = y;
mLastZ = z;
if (deltaX > deltaY) {
Toast.makeText(getBaseContext(), "Horizental", Toast.LENGTH_SHORT).show();
} else if (deltaY > deltaX) {
Toast.makeText(getBaseContext(), "Vertical", Toast.LENGTH_SHORT).show();
}
}
}
}
其他回答
我正在为我的大学项目开发一个运动检测和震动检测应用程序。
除了应用程序的原始目标之外,我还从应用程序中分离了库部分(负责运动和震动检测)。该代码是免费的,可在SourceForge上获得,项目名称为“BenderCatch”。我正在制作的文件将在9月中旬左右准备好。 http://sf.net/projects/bendercatch
它使用了一种更精确的方法来检测震动:当你执行震动时,既观察SensorEvents之间的力差,也观察X轴和Y轴上的振动。它甚至可以在每次震动时发出声音(或振动)。
欢迎通过电子邮件raffaele [at] terzigno [dot] com向我询问更多信息
package anywheresoftware.b4a.student;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.FloatMath;
public class ShakeEventListener implements SensorEventListener {
/*
* The gForce that is necessary to register as shake.
* Must be greater than 1G (one earth gravity unit).
* You can install "G-Force", by Blake La Pierre
* from the Google Play Store and run it to see how
* many G's it takes to register a shake
*/
private static final float SHAKE_THRESHOLD_GRAVITY = 2.7F;
private static int SHAKE_SLOP_TIME_MS = 500;
private static final int SHAKE_COUNT_RESET_TIME_MS = 1000;
private OnShakeListener mListener;
private long mShakeTimestamp;
private int mShakeCount;
public void setOnShakeListener(OnShakeListener listener) {
this.mListener = listener;
}
public interface OnShakeListener {
public void onShake(int count);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// ignore
}
@Override
public void onSensorChanged(SensorEvent event) {
if (mListener != null) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
float gX = x / SensorManager.GRAVITY_EARTH;
float gY = y / SensorManager.GRAVITY_EARTH;
float gZ = z / SensorManager.GRAVITY_EARTH;
// gForce will be close to 1 when there is no movement.
float gForce = FloatMath.sqrt(gX * gX + gY * gY + gZ * gZ);
if (gForce > SHAKE_THRESHOLD_GRAVITY) {
final long now = System.currentTimeMillis();
// ignore shake events too close to each other (500ms)
if (mShakeTimestamp + getSHAKE_SLOP_TIME_MS() > now) {
return;
}
// reset the shake count after 3 seconds of no shakes
if (mShakeTimestamp + SHAKE_COUNT_RESET_TIME_MS < now) {
mShakeCount = 0;
}
mShakeTimestamp = now;
mShakeCount++;
mListener.onShake(mShakeCount);
}
}
}
private long getSHAKE_SLOP_TIME_MS() {
// TODO Auto-generated method stub
return SHAKE_SLOP_TIME_MS;
}
public void setSHAKE_SLOP_TIME_MS(int sHAKE_SLOP_TIME_MS) {
SHAKE_SLOP_TIME_MS = sHAKE_SLOP_TIME_MS;
}
}
下面是一个示例代码。 把这些放到你的活动课上:
/* put this into your activity class */
private SensorManager mSensorManager;
private float mAccel; // acceleration apart from gravity
private float mAccelCurrent; // current acceleration including gravity
private float mAccelLast; // last acceleration including gravity
private final SensorEventListener mSensorListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent se) {
float x = se.values[0];
float y = se.values[1];
float z = se.values[2];
mAccelLast = mAccelCurrent;
mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
float delta = mAccelCurrent - mAccelLast;
mAccel = mAccel * 0.9f + delta; // perform low-cut filter
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
};
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
mSensorManager.unregisterListener(mSensorListener);
super.onPause();
}
把这个添加到你的onCreate方法中:
/* do this in onCreate */
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
mAccel = 0.00f;
mAccelCurrent = SensorManager.GRAVITY_EARTH;
mAccelLast = SensorManager.GRAVITY_EARTH;
然后你可以在你的应用程序中任何你想要的地方询问“mAccel”当前加速度,独立于轴,并从静态加速度(如重力)中清除。 大概是。如果没有移动,则为0,如果设备震动,则为>2。
根据评论-测试这一点:
if (mAccel > 12) {
Toast toast = Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG);
toast.show();
}
注:
The accelometer should be deactivated onPause and activated onResume to save resources (CPU, Battery). The code assumes we are on planet Earth ;-) and initializes the acceleration to earth gravity. Otherwise you would get a strong "shake" when the application starts and "hits" the ground from free-fall. However, the code gets used to the gravitation due to the low-cut filter and would work also on other planets or in free space, once it is initialized. (you never know how long your application will be in use...;-)
你可以用地震法。这里可以找到一个例子。
下面是我的颤抖手势检测代码:
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
/**
* Listener that detects shake gesture.
*/
public class ShakeEventListener implements SensorEventListener {
/** Minimum movement force to consider. */
private static final int MIN_FORCE = 10;
/**
* Minimum times in a shake gesture that the direction of movement needs to
* change.
*/
private static final int MIN_DIRECTION_CHANGE = 3;
/** Maximum pause between movements. */
private static final int MAX_PAUSE_BETHWEEN_DIRECTION_CHANGE = 200;
/** Maximum allowed time for shake gesture. */
private static final int MAX_TOTAL_DURATION_OF_SHAKE = 400;
/** Time when the gesture started. */
private long mFirstDirectionChangeTime = 0;
/** Time when the last movement started. */
private long mLastDirectionChangeTime;
/** How many movements are considered so far. */
private int mDirectionChangeCount = 0;
/** The last x position. */
private float lastX = 0;
/** The last y position. */
private float lastY = 0;
/** The last z position. */
private float lastZ = 0;
/** OnShakeListener that is called when shake is detected. */
private OnShakeListener mShakeListener;
/**
* Interface for shake gesture.
*/
public interface OnShakeListener {
/**
* Called when shake gesture is detected.
*/
void onShake();
}
public void setOnShakeListener(OnShakeListener listener) {
mShakeListener = listener;
}
@Override
public void onSensorChanged(SensorEvent se) {
// get sensor data
float x = se.values[SensorManager.DATA_X];
float y = se.values[SensorManager.DATA_Y];
float z = se.values[SensorManager.DATA_Z];
// calculate movement
float totalMovement = Math.abs(x + y + z - lastX - lastY - lastZ);
if (totalMovement > MIN_FORCE) {
// get time
long now = System.currentTimeMillis();
// store first movement time
if (mFirstDirectionChangeTime == 0) {
mFirstDirectionChangeTime = now;
mLastDirectionChangeTime = now;
}
// check if the last movement was not long ago
long lastChangeWasAgo = now - mLastDirectionChangeTime;
if (lastChangeWasAgo < MAX_PAUSE_BETHWEEN_DIRECTION_CHANGE) {
// store movement data
mLastDirectionChangeTime = now;
mDirectionChangeCount++;
// store last sensor data
lastX = x;
lastY = y;
lastZ = z;
// check how many movements are so far
if (mDirectionChangeCount >= MIN_DIRECTION_CHANGE) {
// check total duration
long totalDuration = now - mFirstDirectionChangeTime;
if (totalDuration < MAX_TOTAL_DURATION_OF_SHAKE) {
mShakeListener.onShake();
resetShakeParameters();
}
}
} else {
resetShakeParameters();
}
}
}
/**
* Resets the shake parameters to their default values.
*/
private void resetShakeParameters() {
mFirstDirectionChangeTime = 0;
mDirectionChangeCount = 0;
mLastDirectionChangeTime = 0;
lastX = 0;
lastY = 0;
lastZ = 0;
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
把这个添加到你的活动中:
private SensorManager mSensorManager;
private ShakeEventListener mSensorListener;
...
在onCreate()中添加:
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensorListener = new ShakeEventListener();
mSensorListener.setOnShakeListener(new ShakeEventListener.OnShakeListener() {
public void onShake() {
Toast.makeText(KPBActivityImpl.this, "Shake!", Toast.LENGTH_SHORT).show();
}
});
and:
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(mSensorListener,
mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_UI);
}
@Override
protected void onPause() {
mSensorManager.unregisterListener(mSensorListener);
super.onPause();
}