I'm having a problem with the findViewById. I'm trying to call this function but it always returns null.
I have only one activity in my app, MainActivity, in which I am passing params to POST request using Volley to a model that is hosted on Heroku. The model is working fine when I am passing the parameters on Postman Application.
Checking my Heroku logs, I noticed I am getting the error that the parameters that I am passing through the android application, they are NoneType.
Have tried String.Format and passing the url and params as a GET request using volley, but still I can see that only the parts of the url I specified as a string are being passed and the places where params were passed are empty.
Here is the code for my MainActivity:
public class MainActivity extends AppCompatActivity {
EditText a_ge,g_ender,h_eight,w_eight, a_p_hi,a_p_lo,c_holestrol,g_luc,s_moke,a_lco,a_ctive;
Button predict;
TextView result;
String url = "https://hridaya.herokuapp.com/predict";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
a_ge = findViewById(R.id.age);
a_p_hi = findViewById(R.id.ap_hi);
predict = findViewById(R.id.predict);
result = findViewById(R.id.result);
And the method which I am using to pass the POST request:
predict.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// hit the API -> Volley
StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
String data = jsonObject.getString("Cardio");
if(data.equals("1")){
result.setText("You are at Risk");
}else{
result.setText("Not at Risk");
}
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(MainActivity.this, error.getMessage(), Toast.LENGTH_SHORT).show();
}
}){
@Override
protected Map<String,String> getParams(){
Map<String,String> params = new HashMap<String,String>();
params.put("age",a_ge.getText().toString());
params.put("gender",g_ender.getText().toString());
params.put("height",h_eight.getText().toString());
params.put("weight",w_eight.getText().toString());
params.put("ap_hi",a_p_hi.getText().toString());
params.put("ap_lo",a_p_lo.getText().toString());
params.put("cholesterol",c_holestrol.getText().toString());
params.put("glucose",g_luc.getText().toString());
params.put("smoke",s_moke.getText().toString());
params.put("alcohol",a_lco.getText().toString());
params.put("active",a_ctive.getText().toString());
return params;
}
};
RequestQueue queue = Volley.newRequestQueue(MainActivity.this);
queue.getCache().clear();
queue.add(stringRequest);
The code in my activity_main.xml looks like the following:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="UselessParent">
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Heart Disease Predictor"
android:textSize="30sp"
android:textAlignment="center"
android:layout_marginTop="30dp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter Your Age"
android:id="@+id/age"
android:layout_marginTop="20dp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Please Specify Your Gender"
android:id="@+id/gender"
android:layout_marginTop="20dp" />
</ScrollView>
I have tried several of the available solutions, but am still unable to rectify the error.
Please help in finding out the issues in my code, thanks!!
