我有一个使用加速度计的应用程序,但只是在极少数情况下偶尔使用。我想通过默认禁用它并仅在需要时打开它来节省电量。
我唯一发现的是在从 this site 初始化应用程序时设置配置
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
config.useCompass = false;
config.useAccelerometer = false;
MyGame myGame = new MyGame(new AndroidPlatform(this, config));
initialize(myGame , config);
}
但我找不到在应用程序运行时启用/禁用它的方法。有人有想法吗?
编辑:
在上面的例子中,AndroidPlatform 在核心项目中实现了一个 Platform 接口(interface)。我尝试了 Zoe 将配置传递给平台实现并按照以下方式更改它的想法:
@Override
public void enableAccelerometer(boolean enable) {
config.useCompass = enable;
config.useAccelerometer = enable;
}
然后在应该启用加速度计的核心项目中:
private void startInclineMonitoring() {
System.out.println("Before:");
System.out.println(Gdx.input.isPeripheralAvailable(Input.Peripheral.Accelerometer));
System.out.println(Gdx.input.isPeripheralAvailable(Input.Peripheral.Compass));
platform.enableAccelerometer(true);
System.out.println("After:");
System.out.println(Gdx.input.isPeripheralAvailable(Input.Peripheral.Accelerometer));
System.out.println(Gdx.input.isPeripheralAvailable(Input.Peripheral.Compass));
}
不幸的是这个输出:
I/System.out: Before:
I/System.out: false
I/System.out: false
I/System.out: After:
I/System.out: false
I/System.out: false
所以,没有运气。
最佳答案
到目前为止,似乎没有简单的方法可以做到这一点,但我最终实现了自己的 (Android) 运动传感器。我想我会把它分享给 future 的访客:
这假设您有自己的平台接口(interface)和特定于平台的实现,如 this wiki 中所述。 .
首先将这些方法添加到接口(interface)中:
public interface Platform {
public void startMotionSensors(PlatformCallback<float[]> callback);
public void stopMotionSensors();
}
在android实现中:
public class AndroidPlatform implements Platform {
private Activity activity;
private MotionSensor motionSensor;
private Handler handler;
public AndroidPlatform(Activity activity) {
this.activity = activity;
this.motionSensor = new MotionSensor(activity);
this.handler = new Handler();
}
@Override
public void startMotionSensors(final PlatformCallback<float[]> callback) {
handler.post(new Runnable() {
@Override
public void run() {
motionSensor.start(callback);
}
});
}
@Override
public void stopMotionSensors() {
handler.post(new Runnable() {
@Override
public void run() {
motionSensor.stop();
}
});
}
}
MotionSensor 类:
public class MotionSensor implements SensorEventListener {
private Activity activity;
private SensorManager sensorManager;
private float[] gravity = new float[3];
private float[] geomag = new float[3];
private float[] rotationMatrix = new float[16];
private float[] inclinationMatrix = new float[16];
private PlatformCallback<float[]> callback;
public MotionSensor(Activity activity) {
this.activity = activity;
}
@Override
public void onSensorChanged(SensorEvent event) {
switch (event.sensor.getType()) {
case Sensor.TYPE_ACCELEROMETER:
gravity = event.values.clone();
break;
case Sensor.TYPE_MAGNETIC_FIELD:
geomag = event.values.clone();
break;
}
if (gravity != null && geomag != null) {
boolean success = SensorManager.getRotationMatrix(rotationMatrix,
inclinationMatrix, gravity, geomag);
if (success) {
notifyCallback(new Result(), rotationMatrix);
}
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int i) {
}
private void notifyCallback(Result result, float[] rotationMatrix) {
callback.callback(result, rotationMatrix);
}
public void start(PlatformCallback<float[]> callback) {
this.callback = callback;
sensorManager = (SensorManager) activity.getSystemService(Activity.SENSOR_SERVICE);
if (sensorManager != null) {
boolean accelerometerSupport = sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_UI);
boolean magneticFieldSupport = sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD),
SensorManager.SENSOR_DELAY_UI);
if (!accelerometerSupport || !magneticFieldSupport) {
sensorManager.unregisterListener(this);
notifyCallback(new Result(Result.STATE.FAILED, "Not supported"), null);
}
} else {
notifyCallback(new Result(Result.STATE.FAILED, "Not supported"), null);
}
}
public void stop() {
if (sensorManager != null) {
sensorManager.unregisterListener(this);
}
}
}
和 PlaformCallback 类:
public abstract class PlatformCallback<T> {
public void callback(final Result result, final T t) {
Gdx.app.postRunnable(new Runnable() {
@Override
public void run() {
doCallback(result, t);
}
});
}
protected abstract void doCallback(Result result, T t);
}
在核心项目中,您现在可以简单地打开和关闭运动传感器:
private void startMotionSensor() {
platform.startMotionSensors(new PlatformCallback<float[]>() {
@Override
protected void doCallback(Result result, float[] rotationMatrix) {
if (result.ok()) {
// Do what you want with the rotation matrix
}
}
});
}
public void stopMotionSensor() {
platform.stopMotionSensors();
}
关于java - LibGDX - 在运行时激活加速度计,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48853533/