Android集成微信登录的步骤详解

// GeneralAppliction.javapublic static IWXAPI sApi;@Overridepublic void onCreate() { super.onCreate(); sApi = WXEntryActivity.initWeiXin(this, AppConst.WEIXIN_APP_ID);}

// MainActivity.javaWXEntryActivity.loginWeixin(MainActivity.this, GeneralAppliction.sApi);

<activity  android:name=".wxapi.WXEntryActivity"  android:theme="@android:style/Theme.Translucent.NoTitleBar" android:configChanges="keyboardHidden|orientation|screenSize" android:exported="true" android:screenOrientation="portrait" />

@Overridepublic void onCreate() {  super.onCreate(); // 初始化微信组件 initWeiXin();}public static IWXAPI sApi;private void initWeiXin() { sApi = WXEntryActivity.initWeiXin(this, AppConst.WEIXIN_APP_ID);}

// 实现IWXAPIEventHandler 接口，以便于微信事件处理的回调public class WXEntryActivity extends Activity implements IWXAPIEventHandler { private static final String WEIXIN_ACCESS_TOKEN_KEY = "wx_access_token_key"; private static final String WEIXIN_OPENID_KEY = "wx_openid_key"; private static final String WEIXIN_REFRESH_TOKEN_KEY = "wx_refresh_token_key"; private Gson mGson; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 微信事件回调接口注册 GeneralAppliction.sApi.handleIntent(getIntent(), this); mGson = new Gson(); } /** * 微信组件注册初始化 * @param context 上下文 * @param weixin_app_id appid * @return 微信组件api对象 * / public static IWXAPI initWeiXin(Context context, @NonNull String weixin_app_id) { if (TextUtils.isEmpty(weixin_app_id)) { Toast.makeText(context.getApplicationContext(), "app_id 不能为空", Toast.LENGTH_SHORT).show(); } IWXAPI api = WXAPIFactory.createWXAPI(context, weixin_app_id, true); api.registerApp(weixin_app_id); return api; } /**  * 登录微信  *  * @param api 微信服务api  */ public static void loginWeixin(Context context, IWXAPI api) { // 判断是否安装了微信客户端  if (!api.isWXAppInstalled()) {  Toast.makeText(context.getApplicationContext(), "您还未安装微信客户端！", Toast.LENGTH_SHORT).show();  return;  } // 发送授权登录信息，来获取code SendAuth.Req req = new SendAuth.Req();  // 应用的作用域，获取个人信息 req.scope = "snsapi_userinfo";  /**  * 用于保持请求和回调的状态，授权请求后原样带回给第三方 * 为了防止csrf攻击（跨站请求伪造攻击），后期改为随机数加session来校验  */  req.state = "app_wechat"; api.sendReq(req); } // 微信发送请求到第三方应用时，会回调到该方法 @Override public void onReq(BaseReq req) {  switch (req.getType()) {  case ConstantsAPI.COMMAND_GETMESSAGE_FROM_WX:  break;  case ConstantsAPI.COMMAND_SHOWMESSAGE_FROM_WX: break;  default:  break;  } } // 第三方应用发送到微信的请求处理后的响应结果，会回调到该方法 @Override public void onResp(BaseResp resp) { switch (resp.errCode) {  // 发送成功  case BaseResp.ErrCode.ERR_OK: // 获取code String code = ((SendAuth.Resp) resp).code; // 通过code获取授权口令access_token getAccessToken(code); break; } }}

WXEntryActivity.loginWeixin(MainActivity.this, GeneralAppliction.sApi);

/** * 获取授权口令 */private void getAccessToken(String code) {  String url = "https://api.weixin.qq.com/sns/oauth2/access_token?" + "appid=" + AppConst.WEIXIN_APP_ID + "&secret=" + AppConst.WEIXIN_APP_SECRET + "&code=" + code + "&grant_type=authorization_code";  // 网络请求获取access_token  httpRequest(url, new ApiCallback<String>() {  @Override  public void onSuccess(String response) {  Logger.e(response);  // 判断是否获取成功，成功则去获取用户信息，否则提示失败  processGetAccessTokenResult(response);  }  @Override  public void onError(int errorCode, final String errorMsg) { Logger.e(errorMsg);  showMessage("错误信息: " + errorMsg);  }  @Override  public void onFailure(IOException e) { Logger.e(e.getMessage());  showMessage("登录失败");  }  });}/** * 处理获取的授权信息结果 * @param response 授权信息结果 */private void processGetAccessTokenResult(String response) {  // 验证获取授权口令返回的信息是否成功 if (validateSuccess(response)) { // 使用Gson解析返回的授权口令信息  WXAccessTokenInfo tokenInfo = mGson.fromJson(response, WXAccessTokenInfo.class); Logger.e(tokenInfo.toString()); // 保存信息到手机本地 saveAccessInfotoLocation(tokenInfo); // 获取用户信息  getUserInfo(tokenInfo.getAccess_token(), tokenInfo.getOpenid());  } else { // 授权口令获取失败，解析返回错误信息  WXErrorInfo wxErrorInfo = mGson.fromJson(response, WXErrorInfo.class);  Logger.e(wxErrorInfo.toString());  // 提示错误信息 showMessage("错误信息: " + wxErrorInfo.getErrmsg());  }}/** * 验证是否成功 * * @param response 返回消息 * @return 是否成功 */private boolean validateSuccess(String response) {  String errFlag = "errmsg";  return (errFlag.contains(response) && !"ok".equals(response))  || (!"errcode".contains(response) && !errFlag.contains(response));}

// 从手机本地获取存储的授权口令信息，判断是否存在access_token，不存在请求获取，存在就判断是否过期String accessToken = (String) ShareUtils.getValue(this, WEIXIN_ACCESS_TOKEN_KEY, "none");String openid = (String) ShareUtils.getValue(this, WEIXIN_OPENID_KEY, "");if (!"none".equals(accessToken)) { // 有access_token，判断是否过期有效 isExpireAccessToken(accessToken, openid);} else { // 没有access_token getAccessToken(code);}

/** * 判断accesstoken是过期 * @param accessToken token * @param openid 授权用户唯一标识 */private void isExpireAccessToken(final String accessToken, final String openid) { String url = "https://api.weixin.qq.com/sns/auth?" +  "access_token=" + accessToken +  "&openid=" + openid; httpRequest(url, new ApiCallback<String>() { @Override public void onSuccess(String response) { Logger.e(response); if (validateSuccess(response)) { // accessToken没有过期，获取用户信息 getUserInfo(accessToken, openid); } else { // 过期了，使用refresh_token来刷新accesstoken refreshAccessToken(); } } @Override public void onError(int errorCode, final String errorMsg) { Logger.e(errorMsg); showMessage("错误信息: " + errorMsg); } @Override public void onFailure(IOException e) { Logger.e(e.getMessage()); showMessage("登录失败"); } });}

/** * 刷新获取新的access_token */private void refreshAccessToken() { // 从本地获取以存储的refresh_token final String refreshToken = (String) ShareUtils.getValue(this, WEIXIN_REFRESH_TOKEN_KEY, ""); if (TextUtils.isEmpty(refreshToken)) { return; } // 拼装刷新access_token的url请求地址 String url = "https://api.weixin.qq.com/sns/oauth2/refresh_token?" + "appid=" + AppConst.WEIXIN_APP_ID + "&grant_type=refresh_token" + "&refresh_token=" + refreshToken; // 请求执行 httpRequest(url, new ApiCallback<String>() { @Override public void onSuccess(String response) { Logger.e("refreshAccessToken: " + response); // 判断是否获取成功，成功则去获取用户信息，否则提示失败 processGetAccessTokenResult(response); } @Override public void onError(int errorCode, final String errorMsg) { Logger.e(errorMsg); showMessage("错误信息: " + errorMsg); // 重新请求授权 loginWeixin(WXEntryActivity.this.getApplicationContext(), GeneralAppliction.sApi); } @Override public void onFailure(IOException e) { Logger.e(e.getMessage()); showMessage("登录失败"); // 重新请求授权 loginWeixin(WXEntryActivity.this.getApplicationContext(), GeneralAppliction.sApi); } });}

/** * 获取用户信息 */private void getUserInfo(String access_token, String openid) { String url = "https://api.weixin.qq.com/sns/userinfo?" + "access_token=" + access_token + "&openid=" + openid; httpRequest(url, new ApiCallback<String>() { @Override public void onSuccess(String response) { // 解析获取的用户信息 WXUserInfo userInfo = mGson.fromJson(response, WXUserInfo.class); Logger.e("用户信息获取结果：" + userInfo.toString()); } @Override public void onError(int errorCode, String errorMsg) { showMessage("错误信息: " + errorMsg); } @Override public void onFailure(IOException e) { showMessage("获取用户信息失败"); } });}

private OkHttpClient mHttpClient = new OkHttpClient.Builder().build();private Handler mCallbackHandler = new Handler(Looper.getMainLooper());/** * 通过Okhttp与微信通信 * * @param url 请求地址 * @throws Exception */public void httpRequest(String url, final ApiCallback<String> callback) { Logger.e("url: %s", url); final Request request = new Request.Builder() .url(url) .get() .build(); mHttpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, final IOException e) { if (callback != null) { mCallbackHandler.post(new Runnable() {  @Override  public void run() {  // 请求失败，主线程回调  callback.onFailure(e);  } }); } } @Override public void onResponse(Call call, final Response response) throws IOException { if (callback != null) { if (!response.isSuccessful()) {  mCallbackHandler.post(new Runnable() {  @Override  public void run() {  // 请求出错，主线程回调  callback.onError(response.code(), response.message());  }  }); } else {  mCallbackHandler.post(new Runnable() {  @Override  public void run() {  try {  // 请求成功，主线程返回请求结果  callback.onSuccess(response.body().string());  } catch (final IOException e) {  // 异常出错，主线程回调  mCallbackHandler.post(new Runnable() {   @Override   public void run() {   callback.onFailure(e);   }  });  }  }  }); } } } });}// Api通信回调接口public interface ApiCallback<T> { /** * 请求成功 * * @param response 返回结果 */ void onSuccess(T response); /** * 请求出错 * * @param errorCode 错误码 * @param errorMsg 错误信息 */ void onError(int errorCode, String errorMsg); /** * 请求失败 */ void onFailure(IOException e);}