可重用的视图？ [英] Reusable views?

问题描述

我是Android开发的新手，但是我有相当多的Swing / WPF（C＃）GUI经验。我想做的是以下事情：

I'm new to Android development, but I have quite some bit of Swing/WPF(C#) GUI experience. What I'm trying to do is the following:

我有一个带有3个独立视图的 BottomNavigationView 。每个视图都是作为片段实现的，该片段通过 OnNavigationItemSelectedListener 在MainActivity Java代码中显示/隐藏：

I have a BottomNavigationView with 3 separate views. Each view is implemented as a fragment that is shown/ hidden in the MainActivity java code through a OnNavigationItemSelectedListener:

private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
        = new BottomNavigationView.OnNavigationItemSelectedListener() {

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.one:
                findViewById(R.id.one).setVisibility(View.VISIBLE);
                findViewById(R.id.two).setVisibility(View.GONE);
                findViewById(R.id.threee).setVisibility(View.GONE);
                return true;
    // ... and so on

我的问题是接口的一部分其中两个片段是相同的，由一组 EditText 和 ImageButton 组成。因此，我想到了创建可重用的东西，而不是将代码加倍。我的选择是在片段内部制作一个片段（但在互联网上我认为这是不建议的）或制作可重复使用的视图（ https://developer.android.com/training/improving-layouts/reusing-layouts.html ，> https://developer.android.com/guide/topics/ui/custom-components.html ）。最好的方法是什么？我想要一个带有已连接Java代码的xml布局，在这里我可以收听 EditText 和 Buttons 并采取相应行动。也许我对WPF的经验有偏见，但我试图使其像xaml +代码隐藏，这可能不是构建Android应用程序时解决问题的正确方法。

My problem is that a part of the interface of two of the fragments is identical and made of a set of EditText and ImageButton. So I thought of creating something re-usable instead of doubling the code. My options are to make a fragment inside a fragment (but around the internet I saw that this is not advisable) or to make a re-usable view (https://developer.android.com/training/improving-layouts/reusing-layouts.html, https://developer.android.com/guide/topics/ui/custom-components.html). What is the best way to do it? I'd like to have a xml layout with a connected java code, where I can listen to the interactions with the EditText and the Buttons and act accordingly. Maybe I'm biased by my WPF experience but I'm trying to make it like a xaml + codebehind, which may not be the correct way to tackle the problem when building Android apps.

推荐答案

您将必须为视图定义一个单独的XML布局，该视图将多次使用，并且

You will have to define a separate XML layout for a View that you will use more than once and

在XML中


您将在布局内使用< include> 标记，例如

 ...
<include layout="@layout/your_frequent_used_layout"/>

<TextView android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="@string/hello"
          android:padding="10dp" />
....

更多信息此处为文档培训！

在Java中


对于Java端如果要获取特定视图并添加到当前布局，则需要布局Inflater，然后将其添加到在活动中像这样查看（在您的片段中考虑是否抛出任何错误）

第一个选项：

View view = null;
LayoutInflater inflater = 
(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
view = inflater.inflate(R.layout.your_reusable_view, null);
your_main_root_view.addView(view);

第二个选项：

View child = getLayoutInflater().inflate(R.layout.your_reusable_view, null);
your_main_root_view.addView(child);

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