啟動APK的默認Activity

    public static void startApkActivity(final Context ctx, String packageName) {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi;
            try {
                pi = pm.getPackageInfo(packageName, 0);
                Intent intent = new Intent(Intent.ACTION_MAIN, null);
                intent.addCategory(Intent.CATEGORY_LAUNCHER);
                intent.setPackage(pi.packageName);


            List<ResolveInfo> apps = pm.queryIntentActivities(intent, 0);

            ResolveInfo ri = apps.iterator().next();
            if (ri != null) {
                String className = ri.activityInfo.name;
                intent.setComponent(new ComponentName(packageName, className));
                ctx.startActivity(intent);
            }
        } catch (NameNotFoundException e) {
            Log.e("startActivity", e);
        }
    }</pre>