**
 * 自定义授权界面，申请令牌
 */
public class OAuthActivity extends Activity {
 //保存数据信息
 private SharedPreferences preferences;
 private static final String TAG = "OAuthActivity";
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.webview);
  //获取只能被本程序读写的SharedPreferences对象
  preferences = getSharedPreferences("OAuth2.0", Context.MODE_PRIVATE);
  //WebView加载回调页
  WebView webView = (WebView) findViewById(R.id.webView);
  //管理WebView
  WebSettings webSettings = webView.getSettings();
  //启用JavaScript调用功能
  webSettings.setJavaScriptEnabled(true);
  //启用缩放网页功能
  webSettings.setSupportZoom(true);
  //获取焦点
  webView.requestFocus();
  //判断网络连接状态，无网络则去设置网络，有网则继续
  String url = Constants.URL;
  webView.loadUrl(url);
  //WebViewClient主要帮助WebView处理各种通知、请求事件
  WebViewClient client = new WebViewClient() {
   /**
    * 页面加载时会回调该方法，如果用户同意就会成功获取code
    * 然后发送一个异步的post请求获取access_token
    * 若成功获取access_token信息，则保存所有重要信息
    * 并跳转到主界面
    * @param view 显现界面视图
    * @param url 加载网址
    * @param favicon 网址的相关图标
    */
   @Override
   public void onPageStarted(WebView view, String url, Bitmap favicon) {
    if (url.startsWith(Constants.REDIRECT_URL)) {
     String code = url.split("=")[1];
     //设置请求参数
     RequestParams params = new RequestParams();
     params.put("client_id", Constants.CLIENT_ID);
     params.put("client_secret", Constants.APP_SECRET);
     params.put("grant_type", "authorization_code");
     params.put("redirect_uri", Constants.REDIRECT_URL);
     params.put("code", code);
     //发送异步post请求access_token令牌，并保存的OAthu的
     // client_id和client_secret和access_token等重要信息
     WeiboRestClient.post("oauth2/access_token", params, new AsyncHttpResponseHandler() {
      @Override
      public void onSuccess(int i, Header[] headers, byte[] bytes) {
       String data = new String(bytes);
       try {
        //服务器返回数据
        JSONObject object = new JSONObject(data);
        (preferences.edit()).clear();
        saveData(object);
        Toast.makeText(OAuthActivity.this, "登陆成功", Toast
          .LENGTH_SHORT).show();
        //进入微博主界面
        Intent intent = new Intent(OAuthActivity.this,MainActivity.class);
        startActivity(intent);
        //关闭授权界面
        OAuthActivity.this.finish();
       } catch (JSONException e) {
        e.printStackTrace();
       } }
      @Override
      public void onFailure(int i, Header[] headers, byte[] bytes, Throwable throwable) {
       Toast.makeText(OAuthActivity.this, "登陆失败", Toast.LENGTH_SHORT)
         .show();
       OAuthActivity.this.finish();
      }});}}};
  webView.setWebViewClient(client);
 }

 /**
  * 使用SharedPreferences保存的OAthu的client_id和client_secret和access_token等重要信息
  */
 private void saveData(JSONObject object) {
  try {
   SharedPreferences.Editor editor = preferences.edit();
   editor.putString("access_token", object.getString("access_token"));
   editor.putString("remind_in", object.getString("remind_in"));
   editor.putString("expires_in", object.getString("expires_in"));
   editor.putString("uid", object.getString("uid"));
   editor.putString("client_id", Constants.CLIENT_ID);
   editor.putString("redirect_uri", Constants.REDIRECT_URL);
   editor.putString("client_secret", Constants.APP_SECRET);
   editor.apply();
  } catch (JSONException e) {
   e.printStackTrace();
  } }}

public class WeiboRestClient {
 private static final String BASE_URL = "https://api.weibo.com/";
 private static AsyncHttpClient client = new AsyncHttpClient();
 public static void get(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
  client.get(getAbsoluteUrl(url), params, responseHandler);
 }
 public static void post(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
   client.post(getAbsoluteUrl(url), params, responseHandler);
 }
 private static String getAbsoluteUrl(String relativeUrl) {
  return BASE_URL + relativeUrl;
 }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

 <WebView
  android:id="@+id/webView"
  android:layout_width="match_parent"
  android:layout_height="match_parent"/>
</LinearLayout>