android - 如何将 Object[] 转换为 String[ ]

Question

为了在 ListView 中列出所有正在运行的应用程序，我需要将对象数组转换为字符串数组。

通过这段代码，我读出了所有正在运行的进程:

 private String[] runningProcesses() {
    ActivityManager am = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
    List l = am.getRunningAppProcesses();
    Iterator i = l.iterator();
    PackageManager pm = this.getPackageManager();
    while (i.hasNext()) {
        ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next());
        try {
            c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));
            Log.w("LABEL", c.toString());



        } catch (Exception e) {
            //Name Not FOund Exception
        }
    }


    Object[] object = l.toArray();

如何将 object 转换为 string[] 以便在 listView 中列出所有正在运行的进程？

非常感谢

Answer 1

您不能转换 List<RunningAppProcessInfo>到 String[]直接地。相反，将标签(您正在记录的)存储到单独的 List 中。并在返回时将其转换为数组。

List<String> labels = new ArrayList<String>();

while (i.hasNext()) {
    ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo) (i.next());
    try {
        c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));
        Log.w("LABEL", c.toString());
        labels.add(c.toString());
    } catch (Exception e) {
        //Name Not FOund Exception
    }
}

// convert to array and return
return labels.toArray(new String[0]);