关于在线性布局中以编程方式添加 cardview
[英]About adding cardview programatically inside linear layout
问题描述
I have to create a case where I need to insert 5 card-like structure, inside my linearlayout present in activity_main.xml
我必须创建一个案例，我需要在activity_main.xml中的线性布局中插入 5 个类似卡片的结构
activity_main layout is like this: activity_main 布局是这样的：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/viewMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
</LinearLayout>
And the cardview layout is like this :
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/card"
android:layout_height="100dp"
android:layout_width="250dp"
android:background="@color/white"
app:cardCornerRadius="40dp"
android:orientation="vertical">
<TextView
android:id="@+id/title"
android:text="Title from Android"
android:textAlignment="center"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fontFamily="monospace"/>
<TextView
android:id="@+id/desc"
android:layout_marginTop="40dp"
android:textAlignment="center"
android:text="adding layout dynamically"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fontFamily="serif"/>
</androidx.cardview.widget.CardView>
And on mainactivity onCreate() method I have:在 mainactivity onCreate() 方法上，我有：
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
LinearLayout parent=(LinearLayout) findViewById(R.id.viewMain);
LayoutInflater inflater=getLayoutInflater();
View view=inflater.inflate(R.layout.text_main,parent,true);
for(int i=0;i<3;i++){
parent.addView(view,i);
}
}
Error shown is like:显示的错误如下：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.workout/com.example.workout.MainActivity}: java.lang.IllegalStateException: The specified child already has a parent.
Can anybody please help me how can I fix this, so that I can dynamically insert 5 card like structures inside my linear layout`谁能帮我解决这个问题，这样我就可以在我的线性布局中动态插入 5 张类似卡片的结构`
1 个解决方案
解决方案1
0 已采纳 2022-02-22 04:30:12
Change改变
LayoutInflater inflater=getLayoutInflater();
View view=inflater.inflate(R.layout.text_main,parent,true);
to到
View view = LayoutInflater.from(this).inflate(R.layout.text_main, null);
and add LayoutInflater code in for loop并在 for 循环中添加LayoutInflater代码
Add following code in MainActivity.java在MainActivity.java添加如下代码
LinearLayout parent=(LinearLayout) findViewById(R.id.viewMain);
for (int i = 0; i < 3; i++) {
View view = LayoutInflater.from(this).inflate(R.layout.text_main, null);
TextView title = view.findViewById(R.id.title);
TextView desc = view.findViewById(R.id.desc);
parent.addView(view);
}
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