fetching data from Instagram api for android

Question

Im trying to work on an android application which simply retrieves pictures from the api. Im trying to use retrofit but im consufed how to use it. also I dont understand how to get the access tokens? Do i need the user to login? Cant I simply get images from instagram not particularly related to any user?

I tried something like

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

    mButton = (Button) findViewById(R.id.button);

    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Uri uri = Uri.parse("https://api.instagram.com/oauth/authorize/?client_id=CLIENT-ID&redirect_uri=REDIRECT-URI&response_type=code"); // missing 'http://' will cause crashed
            Intent intent = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(intent);
        }
    });

this leads me to a login page and then it promts me to put in user details and after that gives me some sort of authentication error.

I cannot seem to understand the insta documentation

score 1 · Answer 1 · answered Feb 16 '20 at 12:00

That what I did to do the login:

Just load the web view after the user clicked OK and then extract the code authorization:

webView?.settings?.javaScriptEnabled = true
        webView?.loadUrl(AuthenticationPresenter.urlAuthentication())
        webView?.webViewClient = object : WebViewClient() {
            override fun shouldOverrideUrlLoading(view: WebView?, url: String): Boolean {
                if (url.contains("code=")) {
                    presenter.extractAuthorizationCode(url)
                    return true
                }
                return false
            }
        }

fun urlAuthentication() = "https://api.instagram.com/oauth/authorize/" +
                "?client_id=$CLIENT_ID" +
                "&redirect_uri=$REQUEST_URL_CALLBACK" +
                "&scope=${USER_PROFILE},${USER_MEDIA}" +
                "&response_type=$RESPONSE_TYPE"

Getting the code authorization from the URL:

override fun extractAuthorizationCode(url: String) {
        val uri: Uri = Uri.parse(url)
        val code = uri.getQueryParameter("code")
        if (code != null)
            view?.authorizationCodeSuccess(code)
        else
            view?.authorizationCodeFail()
    }

After getting the code authorization, you should be able to get the access token.

Here's an example using Retrofit2:

interface AuthenticationApiHelper {

    @FormUrlEncoded
    @POST("/oauth/access_token")
    suspend fun getCredentials(
        @Field("code") code: String,
        @Field("client_id") client: String = CLIENT_ID,
        @Field("client_secret") secret: String = CLIENT_SECRET,
        @Field("grant_type") type: String = GRANT_TYPE,
        @Field("redirect_uri") uri: String = REQUEST_URL_CALLBACK
    ): Credentials
}

fetching data from Instagram api for android

1 Answers1