CODEWITHSUNDEEP
androidhttpokhttp
ertrzyiks
ertrzyiks

Reputation: 386

Failed to connect when device is disconnected from PC

I have an Android app which fetches data from the server using okhttp library. It's versioned here: https://github.com/ertrzyiks/android-http-data-widget

class LoadData() : AsyncTask<Void, Void, String>() {
    override fun doInBackground(vararg params: Void?): String? {
        val client = OkHttpClient.Builder()
            .connectTimeout(10, TimeUnit.SECONDS)
            .build()

        val url = URL("https://example.com/some/path")

        val request = Request.Builder()
            .url(url)
            .get()
            .build()

        try {
            val response = client.newCall(request).execute()
            val responseBody = response.body!!.string()

            return responseBody
        } catch (e: Exception) {
            return e.message
        }
    }
}

I also added the internet permission to my manifest file

<uses-permission android:name="android.permission.INTERNET"/>

I connect the mobile device to my computer with USB cable, run application on that device using Android Studio and everything works properly. The request is issued and I can see the response.

When I disconnect USB cable though I see the following error:

failed to connect to example.com/ip here (port 443) from /192.168.1.10 (port 41446) after 10000ms

The issue occurs also when I use HttpUrlConnection.

My mobile device is Samsung Galaxy S8, the Android version is 9.

When I issue a request and then plug USB cable, it works. So apparently my app can access internet only when the device is connected to ADB. How can I fix this?

The libraries I use:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.core:core-ktx:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.squareup.okhttp3:okhttp:4.1.0'
    implementation 'com.fasterxml.jackson.core:jackson-core:2.0.1'
    implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.8'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}

Upvotes: 0

Views: 662

Answers (1)

ertrzyiks
ertrzyiks

Reputation: 386

My Samsung device was put in a battery saving mode with Restrict background data option checked. This option prevents background apps from using Wi-Fi and mobile data. Once I disabled this option, my widget has access to the internet connection even without a connected debugger.

How to disable this option:

  1. Go to Settings
  2. Device care
  3. Click Battery icon
  4. Power mode
  5. Currently selected power mode (I had Medium power saving)
  6. Uncheck Restrict background data
  7. Click Apply button

Upvotes: 0

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