使用Android开发接入第三方原生SDK实现微信登录

dependencies {
 implementation'com.tencent.mm.opensdk:wechat-sdk-android-with-mta:+'
}

<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"/>

// 1.声明一个statid的IWXAPI 以及APPID
private static IWXAPI mWxApi;
private String WX_APPID = "";
 
// 2.初始化微信SDK
mWxApi = WXAPIFactory.createWXAPI(this, WX_APPID, true);
mWxApi.registerApp(WX_APPID);

if (BaseApplication.mWxApi!= null && BaseApplication.mWxApi.isWXAppInstalled()) {
 final SendAuth.Req req = new SendAuth.Req();
 req.scope = "snsapi_userinfo";
 req.state = "wechat_sdk_fth";
 BaseApplication.mWxApi.sendReq(req);
 } else {
 Toast.makeText(LoginActivity.this, "您还没有安装微信", Toast.LENGTH_SHORT).show();
 }

<!-- 注册微信回调 WXEntryActivity -->
<activity
 android:name=".wxapi.WXEntryActivity"
 android:configChanges="keyboardHidden|orientation|screenSize"
 android:exported="true"
 android:screenOrientation="portrait"
 android:theme="@style/NoTitleTranslucentTheme">
</activity>

public class WXEntryActivity extends Activity implements IWXAPIEventHandler {
 
 private Bundle bundle;
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 BaseApplication. mIwapi.handleIntent(getIntent(), WXEntryActivity.this); //必须调用此句话
 }
 
 @Override
 protected void onNewIntent(Intent intent) {
 super.onNewIntent(intent);
 BaseApplication. mIwapi.handleIntent(intent, WXEntryActivity.this);//必须调用此句话
 }
 
 @Override
 public void onReq(BaseReq req) {
 System. out.println();
 }
 
 /**
 * API：https://open.weixin.qq.com/ cgi- bin/showdocument ?action=dir_list&t=resource/res_list&verify=1&id=open1419317853 &lang=zh_CN
 * 在此处得到Code之后调用https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code 获取到token和openID。
 * 之后再调用https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID 获取用户个人信息
 */
 @Override
 public void onResp(BaseResp arg0) {
 bundle=getIntent().getExtras();
 SendAuth.Resp resp = new SendAuth.Resp( bundle);
 //获取到code之后，需要调用接口获取到access_token
 if (resp. errCode == BaseResp.ErrCode. ERR_OK) {
 String code = resp. token;
 if(BaseApplication. isWxLogin){
 getToken(code);
 } else{
 WXEntryActivity. this.finish();
 }
 } else{
 WXEntryActivity. this.finish();
 }
 
 }
 //这个方法会取得accesstoken 和openID
 private void getToken(String code){
 MyProgressDialog. showDialog(WXEntryActivity.this, "登陆", "正在获取用户信息" );
 HttpBase. get("https://api.weixin.qq.com/sns/oauth2/access_token?appid=wxd7673d08f6c1963d&secret=223d726f966031f30125d0e4e7d4aed3&code=" +code+"&grant_type=authorization_code" , new JsonHttpResponseHandler(){
 @Override
 public void onSuccess( int statusCode, JSONObject response) {
 super.onSuccess(statusCode, response);
 getUserInfo(response.optString( "access_token"),response.optString( "openid"));
 }
 @Override
 public void onFailure( int statusCode, Throwable e,
   JSONObject errorResponse) {
 // TODO Auto-generated method stub
 super.onFailure(statusCode, e, errorResponse);
 MyProgressDialog. closeDialog();
 }
 });
 }
 
 //获取到token和openID之后，调用此接口得到身份信息
 private void getUserInfo(String token,String openID){
 HttpBase. get("https://api.weixin.qq.com/sns/userinfo?access_token=" +token+"&openid=" +openID, new JsonHttpResponseHandler(){
 @Override
 public void onSuccess( int statusCode, JSONObject response) {
 super.onSuccess(statusCode, response);
 try {
  String nickname = response.getString("nickname");//获取用户微信名
  String sex = response.getInt("sex") == 1 ? "男" : "女";//获取用户性别
  String header = response.getString( "headimgurl");//获取用户头像
 } catch (JSONException e) {
  e.printStackTrace();
 }
 }
 @Override
 public void onFailure( int statusCode, Throwable e,
   JSONObject errorResponse) {
 super.onFailure(statusCode, e, errorResponse);
 MyProgressDialog. closeDialog();//隐藏dialog
 HttpBase. onFailureTips(WXEntryActivity.this, errorResponse);
 }
 });
 }
}

public class Constants {

 public static final String APP_ID = "wxxxxxxx"; //替换为申请到的app id

}

if(baseResp instanceof SendAuth.Resp){

 SendAuth.Resp newResp = (SendAuth.Resp) baseResp;

 //获取微信传回的code

 final String code = newResp.code;

}