package?com.example.logaxy.sensors;

import?android.hardware.Sensor;
import?android.hardware.SensorEvent;
import?android.hardware.SensorEventListener;
import?android.hardware.SensorManager;
import?android.support.v7.app.AppCompatActivity;
import?android.os.Bundle;
import?android.view.animation.Animation;
import?android.view.animation.RotateAnimation;
import?android.widget.ImageView;

public?class?Compass?extends?AppCompatActivity?{

????private?SensorManager?sensorManager;
????private?ImageView?compassImage;

????@Override
????protected?void?onCreate（Bundle?savedInstanceState）?{
????????super.onCreate（savedInstanceState）;
????????setContentView（R.layout.activity_compass）;

????????compassImage?=?（ImageView）?findViewById（R.id.compassImage）;

????????sensorManager?=?（SensorManager）?getSystemService（SENSOR_SERVICE）;

????????//獲取加速度傳感器
????????Sensor?acceleromenterSensor?=?sensorManager.getDefaultSensor（Sensor.TYPE_ACCELEROMETER）;
????????//獲取地磁傳感器
????????Sensor?magneticSensor?=?sensorManager.getDefaultSensor（Sensor.TYPE_MAGNETIC_FIELD）;

????????sensorManager.registerListener（listener?acceleromenterSensor?SensorManager.SENSOR_DELAY_UI）;
????????sensorManager.registerListener（listener?magneticSensor?SensorManager.SENSOR_DELAY_UI）;

????}

????SensorEventListener?listener?=?new?SensorEventListener（）?{

????????float[]?acceleromenterValues?=?new?float[3];
????????float[]?magneticValues?=?new?float[3];

????????private?float?lastRotateDegree;

????????@Override
????????public?void?onSensorChanged（SensorEvent?event）?{

????????????//獲取加速度傳感器和地磁傳感器的數據，并復制到兩個數組中去
????????????if?（event.sensor.getType（）?==?Sensor.TYPE_ACCELEROMETER）
????????????????acceleromenterValues?=?event.values.clone（）;
????????????else?if?（event.sensor.getType（）?==?Sensor.TYPE_MAGNETIC_FIELD）
????????????????magneticValues?=?event.values.clone（）;

????????????//旋轉矩陣R[]用來保存磁場數據和加速度數據
????????????float[]?R?=?new?float[9];
????????????float[]?values?=?new?float[3];

????????????//根據acceleromenterSensor和magneticSensor的數據填充旋轉矩陣R[]
????????????SensorManager.getRotationMatrix（R?null?acceleromenterValues?magneticValues）;
????????????//根據旋轉矩陣R[]填充values[]
????????????SensorManager.getOrientation（R?values）;

????????????//獲取方向角度，實現指南針為旋轉背景圖片，此處將角度取反
????????????float?rotateDegree?=?-（float）?Math.toDegrees（values[0]）;

????????????//角度變化大于2時，旋轉圖片
????????????if?（Math.abs（rotateDegree?-?lastRotateDegree）?>?2）?{
????????????????RotateAnimation?animation?=?new?RotateAnimation（lastRotateDegree?rotateDegree
????????????????????????Animation.RELATIVE_TO_SELF?0.5f?Animation.RELATIVE_TO_SELF?0.5f）;
????????????????animation.setFillAfter（true）;
????????????????compassImage.startAnimation（animation）;
????????????????lastRotateDegree?=?rotateDegree;
????????????}
????????}

????????@Override
????????public?void?onAccuracyChanged（Sensor?sensor?int?accuracy）?{

????????}
????};
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件????????945??2017-02-25?11:10??Sensor\main\AndroidManifest.xml

?????文件???????3207??2017-02-25?11:35??Sensor\main\java\com\example\logaxy\sensors\Compass.java

?????文件???????2440??2017-02-25?11:21??Sensor\main\java\com\example\logaxy\sensors\Light.java

?????文件???????1456??2017-02-23?16:35??Sensor\main\java\com\example\logaxy\sensors\MainActivity.java

?????文件???????1784??2017-02-25?10:27??Sensor\main\java\com\example\logaxy\sensors\SensorsApplications.java

?????文件???????1304??2017-02-22?13:11??Sensor\main\java\com\example\logaxy\sensors\ShowAllSensors.java

?????文件???????1435??2017-02-25?10:27??Sensor\main\java\com\example\logaxy\sensors\StepCounter.java

?????文件?????255448??2017-02-24?12:56??Sensor\main\res\drawable\arrow.png

?????文件?????514514??2017-02-24?13:22??Sensor\main\res\drawable\compass.png

?????文件????????231??2017-02-22?12:38??Sensor\main\res\drawable\greencricle.xml

?????文件????????231??2017-02-22?12:38??Sensor\main\res\drawable\orangecricle.xml

?????文件???????1086??2017-02-24?13:18??Sensor\main\res\layout\activity_compass.xml

?????文件????????979??2017-02-25?10:27??Sensor\main\res\layout\activity_light.xml

?????文件???????1703??2017-02-22?12:52??Sensor\main\res\layout\activity_main.xml

?????文件???????1245??2017-02-24?13:04??Sensor\main\res\layout\activity_sensors_applications.xml

?????文件???????1073??2017-02-22?13:07??Sensor\main\res\layout\activity_show_all_sensors.xml

?????文件???????1212??2017-02-25?10:27??Sensor\main\res\layout\activity_step_counter.xml

?????文件???????3418??2017-02-22?10:31??Sensor\main\res\mipmap-hdpi\ic_launcher.png

?????文件???????2206??2017-02-22?10:31??Sensor\main\res\mipmap-mdpi\ic_launcher.png

?????文件???????4842??2017-02-22?10:31??Sensor\main\res\mipmap-xhdpi\ic_launcher.png

?????文件???????7718??2017-02-22?10:31??Sensor\main\res\mipmap-xxhdpi\ic_launcher.png

?????文件??????10486??2017-02-22?10:31??Sensor\main\res\mipmap-xxxhdpi\ic_launcher.png

?????文件????????214??2017-02-22?10:31??Sensor\main\res\values\colors.xml

?????文件????????216??2017-02-22?10:31??Sensor\main\res\values\dimens.xml

?????文件?????????73??2017-02-22?10:31??Sensor\main\res\values\strings.xml

?????文件????????394??2017-02-22?10:31??Sensor\main\res\values\styles.xml

?????文件????????364??2017-02-22?10:31??Sensor\main\res\values-w820dp\dimens.xml

?????目錄??????????0??2017-02-25?11:38??Sensor\main\java\com\example\logaxy\sensors

?????目錄??????????0??2017-02-25?11:38??Sensor\main\java\com\example\logaxy

?????目錄??????????0??2017-02-25?11:38??Sensor\main\java\com\example

............此處省略17個文件信息