I am using android studio with Android 2.3 emulator. And i cant find why "onSensorChanged" does not called when i change parameters of accelerometer. I searched for the solution through stackoverflow but nothing worked for me.
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
private Sensor sensor;
private TextView myTextView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myTextView = (TextView) findViewById(R.id.textView3);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
sensorManager.registerListener(this,
sensor,
SensorManager.SENSOR_DELAY_NORMAL);
myTextView.setText("Waiting...");
}
#Override
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(this);
}
#Override
protected void onResume() {
super.onResume();
sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME);
}
#Override
public void onSensorChanged(SensorEvent event) {
Sensor mySensor = event.sensor;
if (mySensor.getType() == Sensor.TYPE_ACCELEROMETER) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
myTextView.setText((int) x);
}
}
#Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
As you see i am changing textView3 to the value "Waiting..." and after running the app it is still "Waiting...". Even after i change the parameters of Accelerometer sensor, but it must show the X value.
Update 1
Deleting the "sensorManager.registerListener(this,sensor, SensorManager.SENSOR_DELAY_NORMAL);" in "onCreate" does not solve the problem. And i need exactly Android 2.3
Update 2
Seems like API 9 does not support Accelerometer emulator.
Source: https://stackoverflow.com/a/10612952/7878803
Related
So i have 2 questions
first i am curious if its possible to move a sprite via a gyroscope
second if so, do i need to specify the movement of the sprite's X & Y or will that be automatic
and/or do i get the gyro's X & Y movement or is that automatic
#beginner
package com.thejames.thesphere;
import androidx.appcompat.app.AppCompatActivity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.ImageView;
public class MainActivity extends AppCompatActivity {
private ImageView thesphere;
private SensorManager sensorManager;
private Sensor gyroscopeSensor;
private SensorEventListener gyroscopeEventListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
gyroscopeSensor = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
gyroscopeEventListener = new SensorEventListener() {
#Override
public void onSensorChanged(SensorEvent sensorEvent) {
if (sensorEvent.values(2) > 0.5f) {
//Sphere+Movement
} else if (sensorEvent.values(2) < -0.5f) {
//Sphere-Movement
}
}
#Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
};
thesphere = findViewById(R.id.thesphere);
}
#Override
protected void onResume() {
super.onResume();
sensorManager.registerListener(gyroscopeEventListener, gyroscopeSensor, sensorManager.SENSOR_DELAY_FASTEST);
}
#Override
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(gyroscopeEventListener);
}
}
I'm trying to make an app to display phones roation in degrees, but onSensorChanged is not getting called. The text in the textView isn't changing and I don't know why. It doesn't give any compile error. Here is the code.
package com.alex.location360;
import androidx.appcompat.app.AppCompatActivity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements SensorEventListener {
TextView textView;
float roll=0;
#Override
public void onSensorChanged(SensorEvent event) {
float[] mGravity = new float[0];
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
mGravity = event.values;
float[] mGeomagnetic = new float[0];
if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
mGeomagnetic = event.values;
if (mGravity != null && mGeomagnetic != null) {
float R[] = new float[9];
float I[] = new float[9];
boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic);
if (success) {
float orientation[] = new float[3];
SensorManager.getOrientation(R, orientation);
float azimuth = orientation[0]; // orientation contains: azimuth, pitch and roll
float pitch = orientation[1];
roll = orientation[2];
roll= (float) Math.toDegrees(roll);
textView.setText(String.valueOf(roll));
Log.e("#",String.valueOf(roll));
}
}
}
#Override
public void onAccuracyChanged(Sensor sensor, int i) {
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView=findViewById(R.id.textView);
}
}
You need to actually subscribe to sensor updates, rather than simply implementing SensorEventListener.
Add this to your onCreate method:
SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
accelerometerSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
magneticFieldSensor = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
sensorManager.registerListener(this, accelerometerSensor, SensorManager.SENSOR_DELAY_NORMAL);
sensorManager.registerListener(this, magneticFieldSensor, SensorManager.SENSOR_DELAY_NORMAL);
You'll probably also want to unsubscribe from the listeners in onDestroy (or use onStart/onStop if you only want updates while the Activity is visible.
package com.example.ritwik.letswalk;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements SensorEventListener{
TextView tv_steps;
SensorManager sensorManager;
boolean running=false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_steps=(TextView) findViewById(r.id.tv_steps);
sensorManager=(SensorManager) getSystemService(Context.SENSOR_SERVICE);
}
#Override
protected void onResume()
{
super.onResume();
running=true;
Sensor countSensor=sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
if(countSensor==null){
sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI);
}
else
Toast.makeText(this, "Sensor Not Found",Toast.LENGTH_SHORT).show();
}
#Override
protected void onPause()
{
super.onPause();
running=false;
}
#Override
protected void onSensorChangeed(SensorEvent event)
{
if(running)
{
tv_steps.setText(String.valueOf(event.values[0]));
}
}
}
the code has the following errors
Error:(21, 15) error: cannot find symbol class TextView
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
Compilation failed; see the compiler error output for details. Error:(12, 5) error: cannot find symbol class TextView Error:(43, 37)
error: cannot find symbol class SensorEvent Error:(11, 8) error:
MainActivity is not abstract and does not override abstract method
onAccuracyChanged(Sensor,int) in SensorEventListener Error:(21, 39)
error: package r does not exist Error:(42, 5) error: method does not
override or implement a method from a supertype
SensorEventListener has two abstract methods :
1) onAccuracyChanged(Sensor sensor, int accuracy)
2) onSensorChanged(SensorEvent event)
You need to override onAccuracyChanged method too.
#Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
This method is called when the accuracy of sensor changes. If you don't wish to do anything here then do not write any code here. But since its abstract you need to implement it.
Hope it helps.
In my pedometer app I did
public void onSensorChanged(SensorEvent event) {
Sensor sensor = event.sensor;
float[] values = event.values;
if (values.length > 0) {
value = (int) values[0];
}
if (sensor.getType() == Sensor.TYPE_STEP_COUNTER) {
textView.setText("" + value);
}
}
public void onAccuracyChanged(Sensor sensor,int a){}
If you want the whole code: Here it is:
import android.app.Activity;
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.widget.TextView;
public class CounterActivity extends Activity implements SensorEventListener {
private TextView textView;
private SensorManager mSensorManager;
private Sensor mStepCounterSensor;
private Sensor mStepDetectorSensor;
int value = -1; //Step Counter
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.counter_activity);
textView = (TextView) findViewById(R.id.steps);
mSensorManager = (SensorManager)
getSystemService(Context.SENSOR_SERVICE);
mStepCounterSensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
mStepDetectorSensor = mSensorManager
.getDefaultSensor(Sensor.TYPE_STEP_DETECTOR);
}
public void onAccuracyChanged(Sensor sensor,int a){}
public void onSensorChanged(SensorEvent event) {
Sensor sensor = event.sensor;
float[] values = event.values;
if (values.length > 0) {
value = (int) values[0];
}
if (sensor.getType() == Sensor.TYPE_STEP_COUNTER) {
textView.setText("" + value);
}
}
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mStepCounterSensor,
SensorManager.SENSOR_DELAY_FASTEST);
mSensorManager.registerListener(this, mStepDetectorSensor,
SensorManager.SENSOR_DELAY_FASTEST);
}
protected void onStop() {
super.onStop();
mSensorManager.unregisterListener(this, mStepCounterSensor);
mSensorManager.unregisterListener(this, mStepDetectorSensor);
}
}
I have made some java code in android studio to where it counts how many steps someone takes but I'm not sure how I can make it to where it counts how many miles the user walks. Here is the code.
If anyone can tell me how to do it that would be appreciated, Thanks.
package com.example.andyheggis.healthapp;
import android.content.Context;
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;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements SensorEventListener {
TextView tv_steps;
SensorManager sensorManager;
boolean running = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_steps = (TextView) findViewById(R.id.tv_steps);
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
}
#Override
protected void onResume() {
super.onResume();
running = true;
Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
if(countSensor != null) {
sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI);
} else {
Toast.makeText(this, "Sensor not found!", Toast.LENGTH_LONG).show();
}
}
#Override
protected void onPause() {
super.onPause();
running = false;
//if you unregister the hardware will stop detecting steps
//sensorManager.unregisterListener(this);
}
#Override
public void onSensorChanged(SensorEvent event) {
if(running) {
tv_steps.setText(String.valueOf(event.values[0]));
}
}
#Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}
I must do an application that returns a random number by shaking the phone. I've made it with a button and it works fine. The problems is with the accelerometer. It doesn't works, even though I have no errors.
import java.util.Random;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class RandomButtonActivity extends Activity implements SensorEventListener
{
Button tasto1;
TextView testo;
TextView message;
EditText limiteMin;
EditText limiteMax;
Random generator = new Random();
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
testo = (TextView) findViewById(R.id.textView1);
limiteMin = (EditText) findViewById(R.id.editText2);
limiteMax = (EditText) findViewById(R.id.EditText01);
}
public void onSensorChanged(SensorEvent event)
{
Sensor sensor = event.sensor;
if (sensor.getType()==Sensor.TYPE_ACCELEROMETER)
{
int j = Integer.parseInt(limiteMin.getText().toString());
int i = Integer.parseInt(limiteMax.getText().toString())-j;
int x = 0;
if(i==0 && j==0)
{
x = generator.nextInt();
while(x<0)
{
x = generator.nextInt();
}
}
else
{
if(j>=i)
{
i = 0;
j = 0;
}
else
{
x = generator.nextInt(i+1)+j;
testo.setText(""+x);
}
}
testo.setText(""+x);
}
else
{
}
}
public void onAccuracyChanged(Sensor sensor, int accuracy)
{
}
}
Looking around the internet this code should work just fine. I've done nothing to the XML file.
EDIT:
I added:
<uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true"
to Android:manifest but nothing has changed.
It seems that you never add your class as an event listener.
This code works for me:
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//This is what you are missing:
sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sm.registerListener(this, sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_UI);
}
public void onSensorChanged(SensorEvent event)
{
Sensor sensor = event.sensor;
if (sensor.getType() == Sensor.TYPE_ACCELEROMETER)
{
/// Do something
}
}
public void onAccuracyChanged(Sensor sensor, int accuracy)
{
}
It is also a good idea to override onResume/onStop/onPause like this
#Override protected void onResume()
{
super.onResume();
sm.registerListener(this, sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
#Override protected void onStop()
{
sm.unregisterListener(this);
super.onStop();
}
And as ernell mentioned always remember to have the permissions you need in the manifest.