从所有程序中列表中去启动程序

代码:

                // 启动程序
                try {
                    // 先获取包信息,然后从包信息中获取 所有的activity节点,然后再从activity中获取name的类名
                    PackageInfo packageInfo = pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
                    ActivityInfo[] activites = packageInfo.activities;
                    if(activites == null || activites.length == 0){
                        Toast.makeText(getApplicationContext(), "该应用程序不能被启动", 0).show();

                    }else{
                        ActivityInfo activityInfo = activites[0];
                        Intent start_intent = new Intent();
                        String name = activityInfo.name;
                        ComponentName component = new ComponentName(packageName, name);
                        start_intent.setComponent(component);
                        startActivity(start_intent);
                    }

                } catch (NameNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    Toast.makeText(getApplicationContext(), "该应用程序不能被启动", 0).show();
                }