How do I Deal with deprecated methods in Android Programming?

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I am using some old code reference for coding in Android Studio.
I am facing some methods which are deprecated.
Where I can find reference to replace the deprecated methods?

This is the code I am using
1. DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();


2. params.add(new BasicNameValuePair("tag", login_tag));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));