你也可以在res/values中定义ids.xml。你可以在android的示例代码中看到一个确切的例子。

samples/ApiDemos/src/com/example/android/apis/RadioGroup1.java
samples/ApiDemp/res/values/ids.xml

我的选择:

// Method that could us an unique id

    int getUniqueId(){
        return (int)    
                SystemClock.currentThreadTimeMillis();    
    }

这对我来说很管用:

static int id = 1;

// Returns a valid id that isn't in use
public int findId(){  
    View v = findViewById(id);  
    while (v != null){  
        v = findViewById(++id);  
    }  
    return id++;  
}

(这是对业余爱好者的回答的评论，但它太长了…呵呵)

Of course a static is not needed here. You could use SharedPreferences to save, instead of static. Either way, the reason is to save the current progress so that its not too slow for complicated layouts. Because, in fact, after its used once, it will be rather fast later. However, I dont feel this is a good way to do it because if you have to rebuild your screen again (say onCreate gets called again), then you probably want to start over from the beginning anyhow, eliminating the need for static. Therefore, just make it an instance variable instead of static.

下面是一个更小的版本，运行速度更快，可能更容易阅读:

int fID = 0;

public int findUnusedId() {
    while( findViewById(++fID) != null );
    return fID;
}

上述函数应该足够了。因为，据我所知，android生成的id有数十亿个，所以这可能会第一次返回1，而且总是很快。 因为，它实际上不会遍历已使用的id来查找未使用的id。但是，如果它确实找到了一个使用的ID，那么循环就在那里。

然而，如果你仍然希望在后续重新创建应用程序之间保存进度，并希望避免使用静态。这是SharedPreferences版本:

SharedPreferences sp = getSharedPreferences("your_pref_name", MODE_PRIVATE);

public int findUnusedId() {
    int fID = sp.getInt("find_unused_id", 0);
    while( findViewById(++fID) != null );
    SharedPreferences.Editor spe = sp.edit();
    spe.putInt("find_unused_id", fID);
    spe.commit();
    return fID;
}

这个类似问题的答案应该告诉你你需要知道的关于android id的一切:https://stackoverflow.com/a/13241629/693927

编辑/修复:刚刚意识到我完全搞砸了保存。我一定是喝醉了。

从API级别17及以上，你可以调用:

然后使用View.setId(int)。

如果你的应用程序的目标低于API级别17，使用viewcompat.com generateviewid ()

int fID;
do {
    fID = Tools.generateViewId();
} while (findViewById(fID) != null);
view.setId(fID);

...

public class Tools {
    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);
    public static int generateViewId() {
        if (Build.VERSION.SDK_INT < 17) {
            for (;;) {
                final int result = sNextGeneratedId.get();
                int newValue = result + 1;
                if (newValue > 0x00FFFFFF)
                    newValue = 1; // Roll over to 1, not 0.
                if (sNextGeneratedId.compareAndSet(result, newValue)) {
                    return result;
                }
            }
        } else {
            return View.generateViewId();
        }
    }
}