tencent API(一) 登录/校验登录态

1.     登录/校验登录态

       通过调用Tencent类的login函数发起登录/校验登录态。

该API具有两个作用：
（1）如果开发者没有调用mTencent实例的setOpenId、setAccessToken API，则该API执行正常的登录操作；
（2）如果开发者先调用mTencent实例的setOpenId、setAccessToken API，则该API执行校验登录态的操作。如果登录态有效，则返回成功给应用，如果登录态失效，则会自动进入登录流程，将最新的登录态数据返回给应用。
建议开发者在每次应用启动时调用一次该API(先调用setOpenId、setAccessToken)，以确保每次打开应用时用户都是有登录态的。

      调用登录API参数说明如下：

     基本流程就是

      

 所以第一步就是自定义一个Activity:

/**
 * 登入验证
 * 
 * @author tanlvxu
 * 
 */
public class MainActivity extends Activity implements OnClickListener{
	/**
	 * api权限
	 */
	private Handler mHandler;
	private TextView mBaseMessageText;//打印登入后读取的base信息
	private TextView mMessageText;//打印登入后读取的message信息
	private Dialog mProgressDialog; //判断是否接收到信息
	private Tencent mTencent; //主控制
	private EditText mEtAppid = null;// 账号输入框
	private ImageView mLoginButton;// 登入按钮
	/**
	 * 线程接收
	 * @param base
	 * @param msg
	 */
	private void showResult(final String base, final String msg) {
		mHandler.post(new Runnable() {

			@Override
			public void run() {
				if (mProgressDialog.isShowing())
					mProgressDialog.dismiss();
				mBaseMessageText.setText(base);
				mMessageText.setText(msg);
			}
		});
	}
	/**
	 * 信息接收类
	 * @author tanlvxu
	 *
	 */
	private class BaseUiListener implements IUiListener {

		@Override
		public void onComplete(Object response) {
			showResult("onComplete:", response.toString());
			doComplete(response);
		}

		protected void doComplete(Object values) {

		}

		@Override
		public void onError(UiError e) {
			showResult("onError:", "code:" + e.errorCode + ", msg:"
					+ e.errorMessage + ", detail:" + e.errorDetail);
		}

		@Override
		public void onCancel() {
			showResult("onCancel", "");
		}
	}

	/**
	 * 主函数
	 */
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		final Context ctxContext = this.getApplicationContext();
		mEtAppid = new EditText(this);
		/**
		 * app_id输入框
		 */
		new AlertDialog.Builder(this)
        .setTitle("请输入APP_ID")
        .setCancelable(false)
        .setIcon(android.R.drawable.ic_dialog_info)
        .setView(mEtAppid)
        
        .setNegativeButton("取消",
                new android.content.DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog,
                            int which) {
                        // TODO Auto-generated method stub
                        mTencent = Tencent.createInstance(AppConstants.APP_ID, ctxContext);
                        mHandler = new Handler();
                        mProgressDialog = new ProgressDialog(
                                MainActivity.this);
                        initViews();
                    }
                })
                .setPositiveButton("确定",
                new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog,
                            int which) {
                        String appid = mEtAppid.getText().toString()
                                .trim();
                        if (!("".equals(appid))) {
                            mTencent = Tencent.createInstance(appid, ctxContext);
                        } else {
                            mTencent = Tencent.createInstance(AppConstants.APP_ID, ctxContext);
                        }
                        mHandler = new Handler();
                        mProgressDialog = new ProgressDialog(
                                MainActivity.this);
                        initViews();
                    }
                }).show();
	}

	/**
	 * 初始化界面
	 */
	private void initViews() {
		mLoginButton = (ImageView) findViewById(R.id.login_btn);
		mBaseMessageText = (TextView) findViewById(R.id.base_message_tv);
        mMessageText = (TextView) findViewById(R.id.message_tv);		
		updateLoginButton();
		mLoginButton.setOnClickListener(this) ;
	}
    /**
     * 更新登入状态按钮
     */
	private void updateLoginButton() {
       mLoginButton.setImageResource(mTencent.isSessionValid()?R.drawable.com_tencent_open_logout
               : R.drawable.com_tencent_open_login) ;
      
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		  Animation shake = AnimationUtils.loadAnimation(this, R.anim.shake);
	        switch (v.getId()) {
	            case R.id.login_btn:
	                onClickLogin();
	                v.startAnimation(shake);
	                break;
	            default :
	            	break ;
	        }
	}
	private void onClickLogin() {
    	if (mTencent.isSessionValid()) {
            mTencent.logout(this);
            updateLoginButton();
    	} else {
	    	IUiListener listener = new BaseUiListener() {
	    		@Override
	    		protected void doComplete(Object values) {
	    		    updateLoginButton();
	    		}
	    	};
	    	mTencent.login(this, "all", listener);//跳转至sdk登入界面
    	}
    }
}

     跳转至登入界面

 登入成功后返回的信息