Service Intent must be explicit

参考：
http://blog.csdn.net/qs_csu/article/details/45114251

我做阿里云账号登录的时候，遇到一个问题，不知道阿里云服务的包名。怎么办？第二种方法可以查，查询之后，自己手动设置setPackage 就可以了。

public static Intent getExplicitIntent(Context context, Intent implicitIntent) {  
        // Retrieve all services that can match the given intent  
        PackageManager pm = context.getPackageManager();  
        List<ResolveInfo> resolveInfo = pm.queryIntentServices(implicitIntent, 0);  
        // Make sure only one match was found  
        if (resolveInfo == null || resolveInfo.size() != 1) {  
            return null;  
        }  
        // Get component info and create ComponentName  
        ResolveInfo serviceInfo = resolveInfo.get(0);  
        String packageName = serviceInfo.serviceInfo.packageName;  
        String className = serviceInfo.serviceInfo.name;  
        ComponentName component = new ComponentName(packageName, className);  
        // Create a new intent. Use the old one for extras and such reuse  
        Intent explicitIntent = new Intent(implicitIntent);  
        // Set the component to be explicit  
        explicitIntent.setComponent(component);  
        return explicitIntent;  
    }  

可以查询手机上面的每一个action对应的Intent。哈哈，好强。