編輯:關於android開發
說到傳感器,還是有很多的,有加速度啊,光照啊,磁傳感器等等。當然android手機之所以稱為智能手機,少不了這幾款傳感器的功勞了。下面就學習下了,這裡主要學習光照,加速度和磁。
新建工程emSensorStudy,布局如下:
<!--{cke_protected}{C}%3C!%2D%2D%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%2D%2D%3E--> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:layout_margin="5dp" tools:context="com.jared.emsensorsstudy.MainActivity"> <textview android:text="Hello Sensors" android:layout_gravity="center" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="22dp"><button android:id="@+id/startLightSensor" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="啟動LightSensor" android:textallcaps="false"></button><button android:id="@+id/startAccelerSensor" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="啟動AccelerSensor" android:textallcaps="false"></button><button android:id="@+id/startMagneticSensor" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="啟動MagneticSensor" android:textallcaps="false"></button></textview></linearlayout>添加LightSensor,AccelerSensor,MagnetiSensor的Activity,修改MainActivity代碼如下:
package com.jared.emsensorsstudy; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button startLightSensorBtn; private Button startAccelerSensorBtn; private Button startMagneticSensorBtn; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); startLightSensorBtn = (Button)findViewById(R.id.startLightSensor); startAccelerSensorBtn = (Button)findViewById(R.id.startAccelerSensor); startMagneticSensorBtn = (Button)findViewById(R.id.startMagneticSensor); startLightSensorBtn.setOnClickListener(new myOnClickListener()); startAccelerSensorBtn.setOnClickListener(new myOnClickListener()); startMagneticSensorBtn.setOnClickListener(new myOnClickListener()); } private class myOnClickListener implements View.OnClickListener { @Override public void onClick(View view) { switch (view.getId()) { case R.id.startAccelerSensor: Intent intent1 = new Intent(getApplicationContext(), AccelerSensor.class); startActivity(intent1); break; case R.id.startLightSensor: Intent intent2 = new Intent(getApplicationContext(), LightSensor.class); startActivity(intent2); break; case R.id.startMagneticSensor: Intent intent3 = new Intent(getApplicationContext(), MagneticSensor.class); startActivity(intent3); break; default: break; } } } }
<!--{cke_protected}{C}%3C!%2D%2D%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%2D%2D%3E--> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="10dp" tools:context="com.jared.emsensorsstudy.LightSensor"> <textview android:id="@+id/light_level" android:layout_gravity="center" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textsize="22dp"> </textview></linearlayout>
package com.jared.emsensorsstudy; 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 LightSensor extends AppCompatActivity { private SensorManager sensorManager; private TextView lightLevel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_light_sensor); lightLevel = (TextView)findViewById(R.id.light_level); initWithLight(); } @Override protected void onDestroy() { super.onDestroy(); if(sensorManager != null) { sensorManager.unregisterListener(listener); } } public void initWithLight() { sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL); } private SensorEventListener listener = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent sensorEvent) { float value = sensorEvent.values[0]; lightLevel.setText("Currrent light level is "+value+"lx"); } @Override public void onAccuracyChanged(Sensor sensor, int i) { } }; }這裡先通過getSystemService獲取sensor,然後通過注冊一個listener來監聽傳感器的變化,當值有變化的時候會調用onSensorChanged方法,具體運行後,用手遮擋聽筒附近的傳感器,顯示如下:
從上可見光照的效果很明顯了。接著我們來試下加速度傳感器。這裡實現微信搖一搖功能,並且成功了震動。
修改布局如下:
<!--{cke_protected}{C}%3C!%2D%2D%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%2D%2D%3E--> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:layout_margin="10dp" tools:context="com.jared.emsensorsstudy.AccelerSensor"> <textview android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="搖一搖獲取更多哦!" android:layout_gravity="" android:textsize="22dp"> <textview android:id="@+id/shack" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:textsize="22dp"> </textview></textview></linearlayout>
package com.jared.emsensorsstudy; 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.os.Vibrator; import android.support.v7.app.AppCompatActivity; import android.widget.TextView; public class AccelerSensor extends AppCompatActivity { private SensorManager sensorManager; private TextView shackPhone; private Vibrator vibrator; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_acceler_sensor); shackPhone = (TextView)findViewById(R.id.shack); initWithAcceler(); } @Override protected void onDestroy() { super.onDestroy(); if(sensorManager != null) { sensorManager.unregisterListener(listener); } } private void initWithAcceler() { sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); sensorManager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_NORMAL); vibrator = (Vibrator)getSystemService(Context.VIBRATOR_SERVICE); } private SensorEventListener listener = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent sensorEvent) { float xValue = Math.abs(sensorEvent.values[0]); float yValue = Math.abs(sensorEvent.values[1]); float zValue = Math.abs(sensorEvent.values[2]); int medumValue = 19; if(xValue > medumValue || yValue > medumValue || zValue > medumValue) { vibrator.vibrate(200); shackPhone.setText("恭喜你搖一搖成功,新年快樂!"); } else { //Toast.makeText(getApplicationContext(), "請使勁搖哦!", Toast.LENGTH_SHORT).show(); } } @Override public void onAccuracyChanged(Sensor sensor, int i) { } }; }
最後來學習下magneticSensor了。這裡實現個compass。首先就是提供一張圖片了,修改布局如下:
<!--{cke_protected}{C}%3C!%2D%2D%3Fxml%20version%3D%221.0%22%20encoding%3D%22utf-8%22%3F%2D%2D%3E--> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="10dp" tools:context="com.jared.emsensorsstudy.MagneticSensor"> <imageview android:id="@+id/compass_img" android:layout_width="250dp" android:layout_height="250dp" android:layout_centerinparent="true" android:src="@drawable/compass"> </imageview></relativelayout>
接著就是修改MagneticSensor的代碼了:
package com.jared.emsensorsstudy; 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.view.animation.Animation; import android.view.animation.RotateAnimation; import android.widget.ImageView; public class MagneticSensor extends AppCompatActivity { private SensorManager sensorManager; private ImageView compassImage; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_magnetic_sensor); compassImage = (ImageView)findViewById(R.id.compass_img); initWithCompass(); } @Override protected void onDestroy() { super.onDestroy(); sensorManager.unregisterListener(listener); } private void initWithCompass() { sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); Sensor magneticSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD); Sensor acclerSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); sensorManager.registerListener(listener, magneticSensor, SensorManager.SENSOR_DELAY_GAME); sensorManager.registerListener(listener, acclerSensor, SensorManager.SENSOR_DELAY_GAME); } private SensorEventListener listener = new SensorEventListener() { float[] acclerValues = new float[3]; float[] magneticValues = new float[3]; private float lastRotateDegree; @Override public void onSensorChanged(SensorEvent sensorEvent) { switch (sensorEvent.sensor.getType()) { case Sensor.TYPE_ACCELEROMETER: acclerValues = sensorEvent.values.clone(); break; case Sensor.TYPE_MAGNETIC_FIELD: magneticValues = sensorEvent.values.clone(); break; default: break; } float[] values = new float[3]; float[] R = new float[9]; //調用getRotaionMatrix獲得變換矩陣R[] SensorManager.getRotationMatrix(R, null, acclerValues, magneticValues); SensorManager.getOrientation(R, values); //經過SensorManager.getOrientation(R, values);得到的values值為弧度 //轉換為角度 float rotateDegree = -(float)Math.toDegrees(values[0]); 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 i) { } }; }
這裡通過加速度和磁傳感器來實現一個方向,因為方向傳感器官方已經不提倡使用了。運行效果如下:
傳感器就先學習這些了。
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