第一步：
在微信开放平台创建安卓应用，需要输入的包名和签名就不用再提吧，不知道的自行百度。
应用创建完毕后会得到两个值：AppID、AppSecret，用这两个值来请求微信。
然后去微信开放平台的资源中心 ，选择安卓资源包 ，如图：
注意：输入的包名和签名要和项目中的一致！
第二步：
将安卓资源包中的libammsdk.jar 导入到项目中的libs文件夹下面。
并在项目中的创建一个包 ，包名必须为 package+wxapi，比如你的包名是com.xxx.android，那就要创建一个 com.xxx.android.wxapi。然后在这个 包下面 建一个类 ，类名为WXEntryActivity。
在AndroidManifest.xml 注册这个类
<activity android:name="com.xxx.android.wxapi.WXEntryActivity" android:configChanges="keyboardHidden|orientation|screenSize" android:exported="true" android:launchMode="singleTop" android:screenOrientation="portrait" android:theme="@android:style/Theme.Translucent.NoTitleBar" > </activity>
下面是WXEntryActivity中的代码：
public class WXEntryActivity extends Activity implements IWXAPIEventHandler { private IWXAPI api; private BaseResp resp = null; private String WX_APP_ID = "创建应用后得到的APP_ID"; private String GetCodeRequest = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code"; private String GetUserInfo = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID"; private String WX_APP_SECRET = "创建应用后得到的APP_SECRET"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); api = WXAPIFactory.createWXAPI(this, WX_APP_ID, false); api.handleIntent(getIntent(), this); } @Override public void onReq(BaseReq req) { finish(); } @Override public void onResp(BaseResp resp) { String result = ""; if (resp != null) { resp = resp; } switch (resp.errCode) { case BaseResp.ErrCode.ERR_OK: result = "发送成功"; Toast.makeText(this, result, Toast.LENGTH_LONG).show(); String code = ((SendAuth.Resp) resp).code; String get_access_token = getCodeRequest(code); AsyncHttpClient client = new AsyncHttpClient(); client.post(get_access_token, new JsonHttpResponseHandler() { @Override public void onSuccess(int statusCode, JSONObject response) { super.onSuccess(statusCode, response); try { if (!response.equals("")) { String access_token = response .getString("access_token"); String openid = response.getString("openid"); String get_user_info_url = getUserInfo( access_token, openid); getUserInfo(get_user_info_url); } } catch (Exception e) { e.printStackTrace(); } } }); finish(); break; case BaseResp.ErrCode.ERR_USER_CANCEL: result = "发送取消"; Toast.makeText(this, result, Toast.LENGTH_LONG).show(); finish(); break; case BaseResp.ErrCode.ERR_AUTH_DENIED: result = "发送被拒绝"; Toast.makeText(this, result, Toast.LENGTH_LONG).show(); finish(); break; default: result = "发送返回"; Toast.makeText(this, result, Toast.LENGTH_LONG).show(); finish(); break; } } /** * 通过拼接的用户信息url获取用户信息 * * @param user_info_url */ private void getUserInfo(String user_info_url) { AsyncHttpClient client = new AsyncHttpClient(); client.get(user_info_url, new JsonHttpResponseHandler() { @Override public void onSuccess(int statusCode, JSONObject response) { super.onSuccess(statusCode, response); try { System.out.println("获取用户信息:" + response); if (!response.equals("")) { String openid = response.getString("openid"); String nickname = response.getString("nickname"); String headimgurl = response.getString("headimgurl"); } } catch (Exception e) { e.printStackTrace(); } } }); } @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); setIntent(intent); api.handleIntent(intent, this); finish(); } /** * 获取access_token的URL（微信） * * @param code * 授权时，微信回调给的 * @return URL */ private String getCodeRequest(String code) { String result = null; GetCodeRequest = GetCodeRequest.replace("APPID", urlEnodeUTF8(WX_APP_ID)); GetCodeRequest = GetCodeRequest.replace("SECRET", urlEnodeUTF8(WX_APP_SECRET)); GetCodeRequest = GetCodeRequest.replace("CODE", urlEnodeUTF8(code)); result = GetCodeRequest; return result; } /** * 获取用户个人信息的URL（微信） * * @param access_token * 获取access_token时给的 * @param openid * 获取access_token时给的 * @return URL */ private String getUserInfo(String access_token, String openid) { String result = null; GetUserInfo = GetUserInfo.replace("ACCESS_TOKEN", urlEnodeUTF8(access_token)); GetUserInfo = GetUserInfo.replace("OPENID", urlEnodeUTF8(openid)); result = GetUserInfo; return result; } private String urlEnodeUTF8(String str) { String result = str; try { result = URLEncoder.encode(str, "UTF-8"); } catch (Exception e) { e.printStackTrace(); } return result; }}
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第三步：
在Activity中调起访问微信
public class LoginActivity extends Activity implements OnClickListener { private Button login; private static IWXAPI WXapi; private String WX_APP_ID = "创建应用后得到的APP_ID"; @Override protected void onCreate(Bundle savedInstanceState) { getWindow().setSoftInputMode( WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.login); init(); } private void init() { login = (Button) findViewById(R.id.bt_login); login.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.login: WXLogin(); break; default: break; } } /** * 登录微信 */ private void WXLogin() { WXapi = WXAPIFactory.createWXAPI(this, WX_APP_ID, true); WXapi.registerApp(WX_APP_ID); SendAuth.Req req = new SendAuth.Req(); req.scope = "snsapi_userinfo"; req.state = "wechat_sdk_demo"; WXapi.sendReq(req); }}
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完毕！
