[英]LibGDX - Activate accelerometer in runtime
我有一個使用加速度計的應用程序,但僅在極少數情況下偶爾使用。 我想保留電池,方法是默認將其禁用,並僅在需要時才將其打開。
我唯一發現的是從此站點初始化應用程序時設置配置
@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);
}
但是我找不到在應用程序運行時啟用/禁用它的方法。 有人有主意嗎?
編輯:
在上面的示例中,AndroidPlatform在核心項目中實現了Platform接口。 我嘗試了Zoe的想法,將配置傳遞給平台實現並按以下步驟進行更改:
@Override
public void enableAccelerometer(boolean enable) {
config.useCompass = enable;
config.useAccelerometer = enable;
}
然后在核心項目中啟用加速度計:
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,這輸出:
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,那里沒有運氣。
到目前為止,似乎還沒有簡便的方法可以執行此操作,但是我最終完成了自己的(Android)運動傳感器實現。 我想與大家分享一下:
這假定您具有本Wiki中所述的平台界面和特定於平台的實現。
首先,將這些方法添加到接口中:
public interface Platform {
public void startMotionSensors(PlatformCallback<float[]> callback);
public void stopMotionSensors();
}
並在android中實現:
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類:
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類:
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);
}
現在,在核心項目中,您只需打開和關閉運動傳感器即可:
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();
}
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