Android sensor and android Sensor

Android sensor and android Sensor

1. Illumination Sensor

Activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/light_level"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"         /></RelativeLayout>

MainActivity. java

Package liqing. lightsensortest; import android. content. context; import android. hardware. sensor; import android. hardware. sensorEvent; import android. hardware. sensorEventListener; import android. hardware. sensorManager; import android. OS. bundle; import android. support. v7.app. appCompatActivity; import android. widget. textView; public class MainActivity extends AppCompatActivity {private SensorManager sensorMana Ger; private TextView lightLevel; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); lightLevel = (TextView) findViewById (R. id. light_level); // obtain the system sensor manager sensorManager = (SensorManager) getSystemService (Context. SENSOR_SERVICE); // obtain the illumination Sensor sensor Sensor = sensorManager. getdefasensensor (Sensor. TYPE_LIGHT); // illumination Sensor Registration listener. The parameter is SensorEventListener instance, sensor object, and output information rate. registerListener (listener, sensor, SensorManager. SENSOR_DELAY_NORMAL);} private SensorEventListener listener = new SensorEventListener () {@ Override public void onSensorChanged (SensorEvent event) {float value = event. values [0]; lightLevel. setText ("Current light level is" + value + "lx") ;}@ Override public void onAccuracy Changed (Sensor sensor, int accuracy) {};@ Override protected void onDestroy () {super. onDestroy (); if (sensorManager! = Null) {// deregister the listener sensorManager. unregisterListener (listener );}}}

2. Accelerator sensor (shake)

Activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/light_level"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        /></RelativeLayout>

MainActivity. java

Public class MainActivity extends AppCompatActivity {private SensorManager sensorManager; private TextView lightLevel; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); lightLevel = (TextView) findViewById (R. id. light_level); sensorManager = (SensorManager) getSystemService (Context. SENSOR_SERVICE); // obtain the acceler Ometer (accelerator) Sensor sensor Sensor = sensorManager. getdefasensensor (Sensor. TYPE_ACCELEROMETER); sensorManager. registerListener (listener, sensor, SensorManager. SENSOR_DELAY_NORMAL);} private SensorEventListener listener = new SensorEventListener () {@ Override public void onSensorChanged (SensorEvent event) {// The value of the sensor SensorEvent in the direction is the X, Y, and Z axes, math. abs () float x = Math. abs (event. values [0]); float y = Math. Abs (event. values [1]); float z = Math. abs (event. values [2]); if (x> 15 | y> 15 | z> 15) {lightLevel. setText ("Shake") ;}}@ Override public void onAccuracyChanged (Sensor sensor, int accuracy) {}}; @ Override protected void onDestroy () {super. onDestroy (); if (sensorManager! = Null) {// deregister the listener sensorManager. unregisterListener (listener );}}}

3. The orientation sensor (car game control direction) uses the acceleration sensor and the Geomagnetic sensor to get the XYZ rotation value through getRotationMatrix () and getOrientation ()

Main_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:id="@+id/light_level"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"         /></RelativeLayout>

MainActivity. java

Package liqing. lightsensortest; import android. content. context; import android. hardware. sensor; import android. hardware. sensorEvent; import android. hardware. sensorEventListener; import android. hardware. sensorManager; import android. OS. bundle; import android. support. v7.app. appCompatActivity; import android. widget. textView; public class MainActivity extends AppCompatActivity {private SensorManager sensorMana Ger; private TextView textView; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); textView = (TextView) findViewById (R. id. light_level); sensorManager = (SensorManager) getSystemService (Context. SENSOR_SERVICE); // obtain the accelerometer (accelerator) Sensor accelerometerSensor = sensorManager. getdefasensensor (Sensor. TYPE_AC CELEROMETER); // to magnetic_FIELD (geomagnetic _ field) Sensor magneticSensor = sensorManager. getdefasensensor (Sensor. TYPE_MAGNETIC_FIELD); // note that the speed of the SENSOR_DELAY_GAME sensor changes quite fast. registerListener (listener, accelerometerSensor, SensorManager. SENSOR_DELAY_GAME); sensorManager. registerListener (listener, magneticSensor, SensorManager. SENSOR_DELAY_GAME);} private SensorEventListener listener = new Sen SorEventListener () {float [] accelerometerValues = new float [3]; float [] magneticValues = new float [3]; @ Override public void onSensorChanged (SensorEvent event) {// note that SensorEvent is the sensor information (including the type and value) switch (event. sensor. getType () {case Sensor. TYPE_ACCELEROMETER: // clone () clone accelerometerValues = event. values. clone (); break; case Sensor. TYPE_MAGNETIC_FIELD: // clone () clone magneticValues = event. values. Clone (); break; default: break;} float [] R = new float [9]; // The Matrix value float [] values = new float [3]; // X, Y, and Z rotation values // getRotationMatrix (get rotation matrix) SensorManager. getRotationMatrix (R, null, accelerometerValues, magneticValues); // getOrientation (obtain the selected value) SensorManager. getOrientation (R, values); textView. setText ("X =" + values [0] + "\ n" + "Y =" + values [1] + "\ n" + "Z =" + values [2] + "\ n ");} @ Override public void OnAccuracyChanged (Sensor sensor, int accuracy) {}}; @ Override protected void onDestroy () {super. onDestroy (); if (sensorManager! = Null) {// deregister the listener sensorManager. unregisterListener (listener );}}}