Android SensorEvent with Orientation Sensor type, Example source code

Setup Eclipse with Android ADT Plugin for test/code environment (by using Android API Level 7 and Emulator).
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Using Android API Level : 7 Android Orientation Example In this example we shall walk through a simple example on how to retrieve values from set of parameters as captured from the Orientation related smartphone device in-built sensor. After setting up development/coding environment using Eclise and Android ADT plugin, along with appropriate version of JDK installed, I had created an Application using 'Android Aplication Project'. I named this example project as 'GeomaticExample', and I have used Graphic Layout of Android Plugin for Eclipse for placing TextView elements on screen. I needed six TextView elements, 3 for labels and 3 for values (sensor captured values). One got to have Sensor Manager and Sensor objects instantiated by using System service from Android API: SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION); sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL); By registering the same class instance using 'this' operator, that means, callback for sensor values can be caught in onSensorChanged(SensorEvent sensorEvent) overridden mwthod. With Sensor.TYPE_ORIENTATION, as the Sensor type, sensorEvent.values would have values in degrees. sensorEvent.values[0] will return angle in degrees between magnetic north direction and the y-axis. This field with value around '0' would depict that the device is facing towards North, value of around 90 will depict that device is pointing towards EAST, while value of around 180 will depict that device is facing towards South, and a value of around 270 would depict device is facing towards WEST. For more details, please refer Android's Official reference of SensorEvent. Some of the main files are listed as follows:
SensorOrientation/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="net.techiecommunity.geomaticexample" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="15" /> <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>


SensorOrientation/res/layout/activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="21dp" android:layout_marginTop="29dp" android:text="value[0]" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView1" android:layout_alignBottom="@+id/textView1" android:layout_centerHorizontal="true" /> <TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="24dp" android:text="value[1]" /> <TextView android:id="@+id/textView4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/textView3" android:layout_alignLeft="@+id/textView2" /> <TextView android:id="@+id/textView5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView3" android:layout_below="@+id/textView3" android:layout_marginTop="35dp" android:text="value[2]" /> <TextView android:id="@+id/textView6" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView5" android:layout_alignBottom="@+id/textView5" android:layout_alignLeft="@+id/textView4" /> </RelativeLayout>


SensorOrientation/src/net/techiecommunity/geomaticexample/MainActivity.java

/** * @author Ishteak * @Contact reaching@techiecommunity.net * THESE SOURCE CODE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THIS * SOURCE CODE. */ package net.techiecommunity.geomaticexample; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.widget.TextView; public class MainActivity extends Activity implements SensorEventListener { private SensorManager sensorManager; private Sensor sensor; private TextView xFld; private TextView yFld; private TextView zFld; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION); sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL); xFld = (TextView) findViewById(R.id.textView2); yFld = (TextView) findViewById(R.id.textView4); zFld = (TextView) findViewById(R.id.textView6); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } @Override public void onAccuracyChanged(Sensor arg0, int arg1) { } @Override public void onSensorChanged(SensorEvent sensorEvent) { xFld.setText(sensorEvent.values[0]+""); yFld.setText(sensorEvent.values[1]+""); zFld.setText(sensorEvent.values[2]+""); } }


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