Thread: OkHttpRequest data retrieval need help

Hello,

For the project I,am working on I have the following chalenge,


With the help of a ESP32 and the BME280 sensor I have a server which gives the sensor data.
No problem s far.
But I would like to have the data in an app on my android mobile.

The url page is converted to a tekst file with the help of the OkHttprequest methode which you can fins on you-tube works like a charm.
In this page/file/string??? I can read the temp. I will retrieve from the file howe can this be done???

package com.example.okhttprequestexample;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.lang.String;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

private TextView mTextViewResult;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mTextViewResult = findViewById(R.id.text_view_result);

OkHttpClient client = new OkHttpClient();

String url = "http://192.168.2.11";

Request request = new Request.Builder()
.url(url)
.build();

client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}

@Override
public void onResponse(Call call, Response response) throws IOException {
if (response.isSuccessful()) {
final String myResponse = response.body().string();

MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
mTextViewResult.setText(myResponse);

}

});
}


}


});
}

}

As newbee I think this must be programmed in the listing/script as shown above.

Any hints and help is welcome.

Regards ilioSS

Hello Norm,

Thanks for your swift relpy.

First the link for the OkHttprequest program android(app)
https://www.youtube.com/watch?v=oGWJ8xD2W6k

must be programmed in the listing/script as shown above. This means that to the best of my knowledge I have to add some program lines in order to retrieve the data. In the main activity.java . Is this correct
If I compile and run on Android studio the app is installed on the Phone and gives the webpage in tekst. ( not possible to upload a pick of the webpage screen)


This app reads a webserver page on my network with http://192.168.2.11 and make a myResponse file which is shown on the mobile Phone.
This file contains the data sensor which I will retriev and make available for an other more readable format.


This must be programmed in the java script of the app. listing below ( sorry if the format was not comply,s the forum rules)

package com.example.okhttprequestexample;
 
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import java.lang.String;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
 
public class MainActivity extends AppCompatActivity {
 
    private TextView mTextViewResult;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        mTextViewResult = findViewById(R.id.text_view_result);
 
        OkHttpClient client = new OkHttpClient();
 
        String url = "http://192.168.2.11";
 
        Request request = new Request.Builder()
                .url(url)
                .build();
 
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
            }
 
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                if (response.isSuccessful()) {
                    final String myResponse = response.body().string();
 
                    MainActivity.this.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            mTextViewResult.setText(myResponse);
 
                             }
 
                    });
                }
 
 
                }
 
 
        });
    }
 
}

As Iam on my laptop it is not possible to enclose a screen shot of the tekst as shown on the mobile. This for more clarification the issue.

btw howe to manage inserting photo,s in this message?

Like to hear.

Kind regards,
ilioSS

Hello Norm,

I just did a quick reply but this will not reflect my apprecition of your help.

I used after I found the logcat.
This was of great help. Also some prints did there work and give me the info I needed.
Also with the help of mu java for dummies in combination with your hints ans aswers I succed to have the sensor data retrieved from the string.
This with index start and index stop.
Now i,am able to use these data in my android app.

Again many thanks.
It was of great help. Nice to have this motivating help/hints.

Kind regads,
ilioSS

ps. I will keep on studying on java/android

For me this issue /question is closed