<?xml version="1.0" encoding="utf-8"?>
<manifest 
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.yeejay.reader"
>

...

defaultConfig {
  applicationId "com.yeejay.reader"
  ...
}

signingConfigs {

  release {
    storeFile file('keystore.jks')
    storePassword 'xxx'
    keyAlias 'xxx'
    keyPassword 'xxx'
  }
}

buildTypes {
  release {
    minifyEnabled false
    proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    signingConfig signingConfigs.release
  }

  debug {
    signingConfig signingConfigs.release
  }
}

dependencies {

...

compile 'com.tencent.mm.opensdk:wechat-sdk-android-with-mta:+'

...

}

public class WXEntryActivity extends Activity implements IWXAPIEventHandler {

public static final String APP_ID = "xxxxxxxxxx";
public static final String APP_SECRET = "xxxxxxxxxx";
private static final String WEIXIN_SCOPE = "snsapi_userinfo";
private static final String WEIXIN_STATE = "login_wx";

private IWXAPI api;
private SendAuth.Req req;

private TextView loginWx;
private User user;
private String wxCode;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.login_wx);
  loginWx = (TextView) findViewById(R.id.login_wx);
  api = WXAPIFactory.createWXAPI(this, APP_ID, false);
  api.registerApp(APP_ID);

  try {
    api.handleIntent(getIntent(), this);
  } catch (NullPointerException e) {
    e.printStackTrace();
  }

  initListener();
}

private void initListener() {
  loginWx.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
      sendAuth();
    }
  });
}

private void sendAuth() {
  req = new SendAuth.Req();
  req.scope = WEIXIN_SCOPE;
  req.state = WEIXIN_STATE;
  api.sendReq(req);
}

@Override
public void onReq(BaseReq baseReq) {
}

@Override
public void onResp(BaseResp baseResp) {
  int type = baseResp.getType();
  if (type == 1) {
    // 登錄
  SendAuth.Resp sendAuthResp = (SendAuth.Resp) baseResp;
  wxCode = sendAuthResp.code;
  String state = ((SendAuth.Resp) baseResp).state;
  int errCode = baseResp.errCode;
  Intent intent = new Intent(WXEntryActivity.this, HomeActivity.class);
  intent.putExtra("login", "login");
  intent.putExtra("wxCode", wxCode);
  startActivity(intent);
  YeeUtils.animOpenActivity(this);
  finish();
  } 
}
  
@Override
public void finish() {
  super.finish();
  YeeUtils.animCloseActivity(this);
}

@Override
protected void onDestroy() {
  super.onDestroy();
  api.unregisterApp();
}
}

api = WXAPIFactory.createWXAPI(this, APP_ID, false);
api.registerApp(APP_ID);

try {
  api.handleIntent(getIntent(), this);
} catch (NullPointerException e) {
  e.printStackTrace();
}

private void getResult(String code) {
  String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="
      + APP_ID
      + "&secret="
      + APP_SECRET
      + "&code="
      + code
      + "&grant_type=authorization_code";
  JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, null, new SuccessResponse(), new ErrorListener());
  StudyApplication.getInstance().newRequestQueue(this).add(request);
}

class SuccessResponse implements Response.Listener<JSONObject> {

  @Override
  public void onResponse(JSONObject response) {
 
    if (null != response) {
      String openid = null;
      try {
        openid = response.getString("openid")
            .toString().trim();
      String access_token = response
          .getString("access_token").toString().trim();     
        SharePreferenceHelper.putValue(getApplicationContext(), "access_token", access_token);
        getUID(openid, access_token);
      }
      catch (JSONException e) {
        e.printStackTrace();
      }
    }
  }
}

private void getUID(final String openId, final String accessToken) {
  String url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + accessToken + "&openid=" + openId;
  JsonObjectRequest request = new JsonObjectRequest(Request.Method.POST, url, null, new UIDSuccessResponse(), new ErrorListener());
  StudyApplication.getInstance().newRequestQueue(this).add(request);
  }

class UIDSuccessResponse implements Response.Listener<JSONObject> {

    @Override
    public void onResponse(JSONObject response) {
      if (response == null) {
        return;
      }
      String nickname = null;
      nickname = response.optString("nickname");
      String unionid = response.optString("unionid");
      String headUrl = response.optString("headimgurl");
      SharePreferenceHelper.putValue(getApplicationContext(), "nickname", nickname);
      SharePreferenceHelper.putValue(getApplicationContext(), "photourl", headUrl);
      SharePreferenceHelper.putValue(getApplicationContext(), "uin", unionid);
      if (user == null) {
        user = new User();
      }
      user.setUin(unionid);
      user.setNickName(nickname);
      user.setHeadImgUrl(headUrl);

      ...
    }
  };