android 简单实现，微信第三方登录

能拿到微信用户的用户名，头像，性别，城市等数据.........

讲下遇到的坑，不注意看官方API的后果。

微信常见问题：
https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419318060&token=&lang=zh_CN


android 移动接入指南: https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=1417751808&token=&lang=zh_CN
android 移动应用微信登录开发指南:https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419317851&token=&lang=zh_CN

我就是使用了和开发平台填写不一致的签名，所以一直启动不了微信那个授权界面。还有就是微信关闭了或者也没后台运行，点两下登录，才能掉起微信的授权界面，具体什么原因没深究，好像官方API有解释。



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看完API，照着android接入指南搭好环境之后，就可以写代码了，微信第三方登录还是比较简单的，官方也说了就三步：



第一步：获得code

 注册到微信：这个必须要做



发送请求，掉起微信授权界面：

发送请求会有返回参数，是一串字符，那个就是code，详细的参数请看官方文档，这样就完成了三步中的第一步了。

第二步，获得token

//请求Token
private void getAccessToken(String code) {
String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="
+ GlobalConstant.WX_APPID
+ "&secret=" + GlobalConstant.WX_SECRET
+ "&code=" + code
+ "&grant_type=authorization_code";

VolleyRequest.newStringRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
access_token = response.getString("access_token");
expires_in = response.getInt("expires_in");
refresh_token = response.getString("refresh_token");
openid = response.getString("openid");
scope = response.getString("scope");
unionid = response.getString("unionid");
Log.e("ljj", "access_token: " + access_token + "\n" + "expires_in: " + expires_in + "\n"
+ "refresh_token: " + refresh_token + "\n"
+ "openid: " + openid + "\n" + "scope: " + scope + "\n" + "unionid: " + unionid);

} catch (JSONException e) {
e.printStackTrace();
}
        //发起用户详细信息请求
getUser(access_token, openid);

}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("ljj", "error: " + error);
}
});
}

这样会有一大段的json返回给你，要自己解析，拿出需要的token和openid，在第三步中作为参数发出去

第三步：获得用户详细信息



在第二步中，写了一个方法直接发送了请求

public void getUser(String access_token, String openid) {
String url = "https://api.weixin.qq.com/sns/userinfo?access_token="
+ access_token
+ "&openid=" + openid;
Log.e("hg", "onResponse: " + url);

VolleyRequest.newStringRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {

//获取的微信用户信息，有头像，性别，名字，城市等等；
Log.e("hg", "onResponse: " + response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("ljj", "error: " + error);
}
});
}

虽然是新手，以前没写过播客，但CSDN这个博客编辑器，有点难操作，挺浪费时间的，一点都不灵性......

直接上代码吧，一共有三步，除了第一步写在了其他界面，第二步，第三步，均写在了wxapi文件下的WXEntryActivity 这个类里面了，下面这个是这个类的由来，在官方文档  android移动接入指南里面有介绍，要按照他的规范写。



第二步和第三步的源码：

package com.hanfang.anyfit.wxapi;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.hanfang.anyfit.AnyfitApplication;
import com.hanfang.anyfit.activity.BaseActivity;
import com.hanfang.anyfit.httputil.httpUtils.VolleyRequest;
import com.hanfang.anyfit.utils.GlobalConstant;
import com.tencent.mm.opensdk.modelbase.BaseReq;
import com.tencent.mm.opensdk.modelbase.BaseResp;
import com.tencent.mm.opensdk.modelmsg.SendAuth;
import com.tencent.mm.opensdk.openapi.IWXAPI;
import com.tencent.mm.opensdk.openapi.IWXAPIEventHandler;

import org.json.JSONException;
import org.json.JSONObject;

/**
* Created by Administrator on 2017/6/18.
*/

public class WXEntryActivity extends BaseActivity implements IWXAPIEventHandler {
private IWXAPI api;

static String access_token;
static int expires_in;
static String refresh_token;
static String openid;
static String scope;
static String unionid;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar();
api = AnyfitApplication.mApp.api;
api.handleIntent(getIntent(), this);

}

@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
api.handleIntent(intent, this);
}

//微信发送请求到第三方应用，会用到该方法
@Override
public void onReq(BaseReq baseReq) {

}

//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 baseResp) {
switch (baseResp.errCode) {
case BaseResp.ErrCode.ERR_OK:
Toast.makeText(this, "发送成功", Toast.LENGTH_SHORT).show();
String code = ((SendAuth.Resp) baseResp).code;
Log.e("ljj", "wx:" + code);

//请求Token
getAccessToken(code);

finish();

break;
case BaseResp.ErrCode.ERR_AUTH_DENIED:
Toast.makeText(this, "发送被拒绝", Toast.LENGTH_SHORT).show();
break;
case BaseResp.ErrCode.ERR_USER_CANCEL:
Toast.makeText(this, "发送取消", Toast.LENGTH_SHORT).show();
break;
case BaseResp.ErrCode.ERR_UNSUPPORT:
Toast.makeText(this, "不支持错误", Toast.LENGTH_SHORT).show();
break;
default:
Toast.makeText(this, "发送返回", Toast.LENGTH_SHORT).show();
break;

}
}

//请求Token
private void getAccessToken(String code) {
String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="
+ GlobalConstant.WX_APPID
+ "&secret=" + GlobalConstant.WX_SECRET
+ "&code=" + code
+ "&grant_type=authorization_code";

VolleyRequest.newStringRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
access_token = response.getString("access_token");
expires_in = response.getInt("expires_in");
refresh_token = response.getString("refresh_token");
openid = response.getString("openid");
scope = response.getString("scope");
unionid = response.getString("unionid");
Log.e("ljj", "access_token: " + access_token + "\n" + "expires_in: " + expires_in + "\n"
+ "refresh_token: " + refresh_token + "\n"
+ "openid: " + openid + "\n" + "scope: " + scope + "\n" + "unionid: " + unionid);

} catch (JSONException e) {
e.printStackTrace();
}
getUser(access_token, openid);
Log.e("ljj", "onResponse: " + response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("ljj", "error: " + error);
}
});
}

public void getUser(String access_token, String openid) {
String url = "https://api.weixin.qq.com/sns/userinfo?access_token="
+ access_token
+ "&openid=" + openid;
Log.e("hg", "onResponse: " + url);

VolleyRequest.newStringRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
//获取的微信用户信息，有头像，性别，名字，城市等等；
Log.e("hg", "onResponse: " + response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("ljj", "error: " + error);
}
});
}
}

新手上路，有哪里不对的，望指出。