Android 实现微信登录

1.在微信开放平台 创建移动应用，并通过审核
2.导入包 compile ‘com.tencent.mm.opensdk:wechat-sdk-android-with-mta:+’
3.AndroidManifest.xml 设置权限 和返回结果

<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"/>


 
        <activity
            android:name=".wxapi.WXEntryActivity"
            android:exported="true"
            android:label="@string/app_name" />

public class WXEntryActivity extends Activity implements IWXAPIEventHandler{

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        IWXAPI api = WXAPIFactory.createWXAPI(this, Contonts.APP_ID, true);
        api.handleIntent(getIntent(),this);
        finish();


    }

    // 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 baseReq) {

    }

    @Override
    public void onResp(BaseResp baseResp) {
        String result;
        switch (baseResp.errCode) {
            case BaseResp.ErrCode.ERR_OK:
                result = "登录成功";
                break;
            case BaseResp.ErrCode.ERR_AUTH_DENIED:
                result = "用户拒绝授权";
                break;
            case BaseResp.ErrCode.ERR_USER_CANCEL :
                result = "用户取消";
                break;
            default:
                result = "失败";
                break;
        }
        if (result != null) {
            Toast.makeText(this, baseResp.errCode + result, Toast.LENGTH_SHORT).show();
        }
    }
}