跳转微信

 /**
     * 跳转到微信
     */
    private void getWechatApi() {
        try {
            Intent intent = new Intent(Intent.ACTION_MAIN);
            ComponentName cmp = new ComponentName("com.tencent.mm", "com.tencent.mm.ui.LauncherUI");
            intent.addCategory(Intent.CATEGORY_LAUNCHER);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setComponent(cmp);
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            // TODO: handle   exception
            GT.toast(this, "检查到您手机没有安装微信，请安装后使用该功能");
        }
    }