Android 如何使用 addView 将视图添加到布局？
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How to use addView to add view to layout?
提问by Majstor
I have read probably all posts and documentation but I still can't solve this issue.
我可能已经阅读了所有帖子和文档，但我仍然无法解决这个问题。
I want to use addView()method to add view to the existing (running) layout but for some reason I cant. I know that this should be easy and basic but still I cant do it. So, please help me.
我想使用addView()方法将视图添加到现有（正在运行）布局中，但由于某种原因我不能。我知道这应该是简单和基本的，但我仍然无法做到。所以，请帮帮我。
Here is a code:
这是一个代码：
LinearLayout layout = (LinearLayout)findViewById(R.id.mainLayout);
TextView text = new TextView(this);
text.setText("test");
layout.addView(text);
That's a code, and the result is that I have displayed only views which are defined in XML file. There is no this new view I have added. When I debug I see this added view as a child of the parent to which I have added it but it isn't displayed.
这是一个代码，结果是我只显示了在 XML 文件中定义的视图。我没有添加这个新视图。当我调试时，我看到这个添加的视图是我添加它的父级的子级，但它没有显示。
here is main.xml:
这是 main.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:id="@+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@drawable/main1" >
<TextView android:id="@+id/app_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:text="@string/app_title"
android:textSize="25dp"
android:gravity="center_horizontal"/>
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="@string/main_screen_counter_title"
android:textSize="15dp"
android:textColor="#FFF"
android:gravity="center_horizontal"/>
<TextView android:id="@+id/frontScreenCounter"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#FFF"
android:text="@string/reading"
android:textSize="33dp"
android:gravity="center_horizontal" />
<GridView android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:numColumns="3"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:textColor="#888"
/>
</LinearLayout>
Please help. This will driving me nuts!
请帮忙。这会让我发疯！
采纳答案by Arun George
You forgot to specify the LayoutParametersfor the newly added view.
您忘记LayoutParameters为新添加的视图指定。
LinearLayout layout = (LinearLayout)findViewById(R.id.mainLayout);
TextView text=new TextView(this);
text.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
text.setText("test");
layout.addView(text);
EDIT
编辑
The GridViewwith an id of @+id/gridviewis defined with a layout height of fill_parent, leaving you with no space to add a new view. Changing its height to wrap_contentmay solve your problem.
该GridView用的ID@+id/gridview与布局高度定义的fill_parent，让你没有空间来添加一个新的视图。将其高度更改为wrap_content可能会解决您的问题。
Adding my comment to this post to help others easily verify the solution.
将我的评论添加到此帖子以帮助其他人轻松验证解决方案。
回答by voghDev
I had the same problem and wasted several time finding the reason.
我遇到了同样的问题，浪费了很多时间寻找原因。
My fault was that I was adding a CustomView that had match_parent set as height.
我的错是我添加了一个将 match_parent 设置为高度的 CustomView。
I hope to save some precious time to anybody who did this silly annoying mistake :)
我希望为那些犯了这个愚蠢而烦人的错误的人节省一些宝贵的时间:)
TextView tv = new TextView(this);
lytMarks.addView(tv);
CustomView cv = new CustomView(this, someObject);
lytMarks.addView(cv); // <-- This one had height = match_parent!!
EditText et = new EditText(this);
lytMarks.addView(et);
回答by peter zhang
Your linearLayout content is over the parent's View. so you need to use ScrollView. like this:
您的 linearLayout 内容在父视图之上。所以你需要使用 ScrollView。像这样：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="@+id/mainLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/main1"
android:orientation="vertical">
<TextView
android:id="@+id/app_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="@string/app_title"
android:textColor="#FFF"
android:textSize="25dp" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:gravity="center_horizontal"
android:text="@string/main_screen_counter_title"
android:textColor="#FFF"
android:textSize="15dp" />
<TextView
android:id="@+id/frontScreenCounter"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="@string/reading"
android:textColor="#FFF"
android:textSize="33dp" />
<GridView
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:columnWidth="90dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="3"
android:stretchMode="columnWidth"
android:textColor="#888"
android:verticalSpacing="10dp" />
</LinearLayout>
</ScrollView>
回答by Fustigador
I can't remember, but maybe there is any "refresh" method to load again the layout.
我不记得了，但也许有任何“刷新”方法可以再次加载布局。
Try layout.invalidate();
尝试 layout.invalidate();
