Following is the complete source code for earth gravity measurement app :
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.naveenj.sensor.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/textView"
android:layout_marginLeft="75dp"
android:layout_marginStart="75dp"
android:layout_marginTop="131dp" />
</RelativeLayout>
This just contains a TextView where we printout the sensor output.
MainActivity.Java :
package com.example.naveenj.sensor;
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.widget.TextView;
public class MainActivity extends AppCompatActivity implements SensorEventListener{
Sensor acc;
SensorManager sm;
TextView t;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sm = (SensorManager)getSystemService(SENSOR_SERVICE);
acc = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sm.registerListener(this, acc, SensorManager.SENSOR_DELAY_NORMAL);
t = (TextView)findViewById(R.id.textView);
}
@Override public void onSensorChanged(SensorEvent event) {
t.setText("X: "+event.values[0]+"Y" + event.values[1]+"z"+
event.values[2]+event.toString());
}
@Override public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
MainActivity class implements the interface SensorEventListener.
This interface has 2 function :
1) onSensorChanged
2) onAccuracyChanged
we then register our main activity class to receive events from sensor
using SensorManager.
when placed idle phone's z-axis will show earth's gravity.
