private void openTaobao(String url){

    if (isAppInstalled(this, "com.taobao.taobao")) {
        //这行代码比较重要
        Intent intent2 = getPackageManager().getLaunchIntentForPackage("com.taobao.taobao"); 
        intent2.setAction("android.intent.action.VIEW");
        intent2.setClassName("com.taobao.taobao", "com.taobao.tao.detail.activity.DetailActivity");
        Uri uri = Uri.parse(url);
        intent2.setData(uri);
        startActivity(intent2);
    }
}

不通过百川打开淘宝app