set.connect仅在第一个按钮上起作用

Question

我正在尝试使用动态数量的Button创建一个可滚动区域，但是我似乎无法以编程方式添加多个按钮

出于某种原因，以下代码仅适用于ID为100的按钮，不适用于随后的ID，有人知道为什么吗？我尝试使用循环添加按钮，但是出现相同的问题

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.constraintlayout.widget.ConstraintSet;

public class MainActivity  extends Activity {

    @SuppressLint("ResourceType")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.li);
        ConstraintSet set = new ConstraintSet();
        set.clone(layout);

        //Button 1:
        Button button = new Button(this);
        button.setText("Hello");
        button.setId(100);
        set.connect(button.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP, 32);
        set.connect(button.getId(),ConstraintSet.RIGHT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,0);
        set.connect(button.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.LEFT,0);
        set.constrainHeight(button.getId(), 200);
        set.applyTo(layout);
        layout.addView(button);

        //Button 2:
        Button newbutton = new Button(this);
        newbutton.setText("aaa");
        newbutton.setId(101);
        set.connect(newbutton.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP, 32);
        set.connect(newbutton.getId(),ConstraintSet.RIGHT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,0);
        set.connect(newbutton.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.LEFT,0);
        set.constrainHeight(newbutton.getId(), 200);
        set.applyTo(layout);
        layout.addView(newbutton);


    }
}

编辑：我的Xml看起来像这样：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="340dp"
        android:layout_marginEnd="52dp"
        android:layout_marginRight="52dp"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ScrollView
        android:layout_width="181dp"
        android:layout_height="0dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0"
        tools:layout_editor_absoluteX="4dp">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/li"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#FFFFFF"
            android:minHeight="732dp"></androidx.constraintlayout.widget.ConstraintLayout>
    </ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

我解决了！！！我所做的就是移动layout.addView（newbutton）;进一步]

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.constraintlayout.widget.ConstraintSet;

public class MainActivity  extends Activity {

    @SuppressLint("ResourceType")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ConstraintLayout layout = (ConstraintLayout) findViewById(R.id.li);
        ConstraintSet set = new ConstraintSet();
        set.clone(layout);

        //Button 1:
        Button button = new Button(this);
        button.setText("Hello");
        button.setId(100);
        set.connect(button.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP, 32);
        set.connect(button.getId(),ConstraintSet.RIGHT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,0);
        set.connect(button.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.LEFT,0);
        set.constrainHeight(button.getId(), 200);
        set.applyTo(layout);
        layout.addView(button);

        //Button 2:
        Button newbutton = new Button(this);
        newbutton.setText("aaa");
        newbutton.setId(1375);
        layout.addView(newbutton);
        set.connect(newbutton.getId(), ConstraintSet.TOP, ConstraintSet.PARENT_ID, ConstraintSet.TOP, 300);
        set.connect(newbutton.getId(),ConstraintSet.RIGHT,ConstraintSet.PARENT_ID,ConstraintSet.RIGHT,0);
        set.connect(newbutton.getId(),ConstraintSet.LEFT,ConstraintSet.PARENT_ID,ConstraintSet.LEFT,0);
        set.constrainHeight(newbutton.getId(), 200);
        set.applyTo(layout);



    }
}

Answer 2

将按钮添加到XML文件，并对每个按钮使用findViewById(R.id.button);