其实两年前做过这个功能，项目最近需要加上获取微信用户信息的需求，索性我就写成一篇文章，当做笔记
我在项目中用到的是点击一个按钮发起微信授权请求的需求，首先判断是否安装微信，如果安装微信则进行用户授权，授权成功之后通过微信提供的接口获取openID等用户信息，然后做自己的业务：
1、 Android端要使用微信登录，必须在微信开发平台创建APP并且审核通过，得到appid和secret
2、 依赖微信SDK
dependencies {
compile ‘com.tencent.mm.opensdk:wechat-sdk-android-without-mta:+’
}
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3、添加权限
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
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4、注册到微信
iwxapi = WXAPIFactory.createWXAPI(this, Constant.APP_ID, true);
iwxapi.registerApp(Constant.APP_ID);
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5、 判断是否安装微信，已安装则发起授权请求
if (!iwxapi.isWXAppInstalled()) { Intent intent = new Intent(this, MyDialogActivity.class); startActivity(intent); } else { final SendAuth.Req req = new SendAuth.Req(); req.scope = "snsapi_userinfo"; req.state = "wechat_sdk_demo_test"; iwxapi.sendReq(req); }
6、在包名下创建wxapi包和WXEntryActivity类（继承Activity并实现IWXAPIEventHandler接口）WXEntryActivity是微信回调的一个类，通常给个透明的主题或者处理完业务逻辑就直接finish。需要在回调中拿到code，然后再根据code去获取AccessToken，然后再根据AccessToken和OpenId去获取UserInfo。
代码如下：
public class WXEntryActivity extends AppCompatActivity implements IWXAPIEventHandler { private IWXAPI iwxapi; private String unionid; private String openid; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getSupportActionBar().hide(); // // 隐藏状态栏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //接收到分享以及登录的intent传递handleIntent方法，处理结果 iwxapi = WXAPIFactory.createWXAPI(this, Constant.APP_ID, false); iwxapi.handleIntent(getIntent(), this); } @Override public void onReq(BaseReq baseReq) { } //请求回调结果处理 @Override public void onResp(BaseResp baseResp) { //登录回调 switch (baseResp.errCode) { case BaseResp.ErrCode.ERR_OK: String code = ((SendAuth.Resp) baseResp).code; //获取用户信息 getAccessToken(code); break; case BaseResp.ErrCode.ERR_AUTH_DENIED://用户拒绝授权 finish(); break; case BaseResp.ErrCode.ERR_USER_CANCEL://用户取消 finish(); break; default: finish(); break; } } private void getAccessToken(String code) { //获取授权 StringBuffer loginUrl = new StringBuffer(); loginUrl.append("https://api.weixin.qq.com/sns/oauth2/access_token") .append("?appid=") .append(Constant.APP_ID) .append("&secret=") .append(Constant.SECRET) .append("&code=") .append(code) .append("&grant_type=authorization_code"); OkHttpUtils.ResultCallback<String> resultCallback = new OkHttpUtils.ResultCallback<String>() { @Override public void onSuccess(String response) { String access = null; String openId = null; try { JSONObject jsonObject = new JSONObject(response); access = jsonObject.getString("access_token"); openId = jsonObject.getString("openid"); } catch (JSONException e) { e.printStackTrace(); } //获取个人信息 String getUserInfo = "https://api.weixin.qq.com/sns/userinfo?access_token=" + access + "&openid=" + openId; OkHttpUtils.ResultCallback<String> reCallback = new OkHttpUtils.ResultCallback<String>() { @Override public void onSuccess(String responses) { String nickName = null; String sex = null; String city = null; String province = null; String country = null; String headimgurl = null; try { JSONObject jsonObject = new JSONObject(responses); openid = jsonObject.getString("openid"); nickName = jsonObject.getString("nickname"); sex = jsonObject.getString("sex"); city = jsonObject.getString("city"); province = jsonObject.getString("province"); country = jsonObject.getString("country"); headimgurl = jsonObject.getString("headimgurl"); unionid = jsonObject.getString("unionid"); loadNetData(1, openid, nickName, sex, province, city, country, headimgurl, unionid); } catch (JSONException e) { e.printStackTrace(); } } @Override public void onFailure(Exception e) { Toast.makeText(WXEntryActivity.this, "登录失败", Toast.LENGTH_SHORT).show(); finish(); } }; OkHttpUtils.get(getUserInfo, reCallback); } @Override public void onFailure(Exception e) { Toast.makeText(WXEntryActivity.this, "登录失败", Toast.LENGTH_SHORT).show(); finish(); } }; OkHttpUtils.get(loginUrl.toString(), resultCallback); } @Override protected void onPause() { overridePendingTransition(0, 0); super.onPause(); } }
这里贴上OkHttpUtils的代码便于大家使用： public class OkHttpUtils { private static OkHttpUtils mInstance; private OkHttpClient mOkHttpClient; private Handler mDelivery; private Gson mGson; private OkHttpUtils() { mOkHttpClient = new OkHttpClient.Builder() .connectTimeout(10, TimeUnit.SECONDS) .writeTimeout(10, TimeUnit.SECONDS) .readTimeout(30, TimeUnit.SECONDS) .build(); mGson = new Gson(); mDelivery = new Handler(Looper.getMainLooper()); } private synchronized static OkHttpUtils getmInstance() { if (mInstance == null) { mInstance = new OkHttpUtils(); } return mInstance; } private void getRequest(String url, final ResultCallback callback) { final Request request = new Request.Builder().url(url).build(); deliveryResult(callback, request); } private void postRequest(String url, final ResultCallback callback, List<Param> params) { Request request = buildPostRequest(url, params); deliveryResult(callback, request); } /** * 处理结果 * @param callback * @param request */ private void deliveryResult(final ResultCallback callback, Request request) { mOkHttpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { sendFailCallback(callback, e); } @Override public void onResponse(Call call, Response response) throws IOException { try { String str = response.body().string(); if (callback.mType == String.class) { /** * 返回字符串 */ sendSuccessCallBack(callback, str); } else { /** * 这里处理解析返回对象 */ Object object = mGson.fromJson(str, callback.mType); sendSuccessCallBack(callback, object); } } catch (final Exception e) { // LogUtils.e(TAG, "convert json failure", e); sendFailCallback(callback, e); } } }); } private void sendFailCallback(final ResultCallback callback, final Exception e) { mDelivery.post(new Runnable() { @Override public void run() { if (callback != null) { callback.onFailure(e); } } }); } private void sendSuccessCallBack(final ResultCallback callback, final Object obj) { mDelivery.post(new Runnable() { @Override public void run() { if (callback != null) { callback.onSuccess(obj); } } }); } private Request buildPostRequest(String url, List<Param> params) { FormBody.Builder builder= new FormBody.Builder(); for (Param param : params) { builder.add(param.key, param.value); } RequestBody requestBody = builder.build(); return new Request.Builder().url(url).post(requestBody).build(); } /**********************对外接口************************/ /** * get请求 * @param url 请求url * @param callback 请求回调 */ public static void get(String url, ResultCallback callback) { getmInstance().getRequest(url, callback); } /** * post请求 * @param url 请求url * @param callback 请求回调 * @param params 请求参数 */ public static void post(String url, final ResultCallback callback, List<Param> params) { getmInstance().postRequest(url, callback, params); } /** * http请求回调类,回调方法在UI线程中执行 * @param <T> */ public static abstract class ResultCallback<T> { Type mType; public ResultCallback(){ mType = getSuperclassTypeParameter(getClass()); } static Type getSuperclassTypeParameter(Class<?> subclass) { Type superclass = subclass.getGenericSuperclass(); if (superclass instanceof Class) { throw new RuntimeException("Missing type parameter."); } ParameterizedType parameterized = (ParameterizedType) superclass; return $Gson$Types.canonicalize(parameterized.getActualTypeArguments()[0]); } /** * 请求成功回调 * @param response */ public abstract void onSuccess(T response); /** * 请求失败回调 * @param e */ public abstract void onFailure(Exception e); } /** * post请求参数类 这里可以根据项目抽取成泛型 */ public static class Param { String key; String value; public Param() { } public Param(String key, String value) { this.key = key; this.value = value; } } }
到此登录授权就结束了，大家有什么不懂的，或者遇到什么问题可在下方留言。
