Android：以编程方式将按钮添加到布局

Question

我正在尝试获取一个添加按钮，以根据按钮左侧的编辑文本将另一个按钮添加到布局中。重点是让一个人列出他们家中的房间，然后当他们输入每个房间时，会生成一个新按钮，以便他们可以单击房间，然后开始下一页。

我已经完成了一个 xml 布局，然后我意识到我正在“以编程方式”添加按钮，所以我以编程方式重新设计了布局，然后在 switch/case 中（这就是我执行 onclicks 的方式）添加按钮我试图向视图添加一个按钮，但它变得非常棘手。我想在edittext下方有一个滚动视图并添加按钮，当他们将所有房间添加到他们的房子时，它最终会填充他们整个家的可滚动按钮列表。有没有办法以编程方式将按钮添加到 xml 布局。我以为你可以，但我正在尝试的一切都不起作用。

感谢大家的帮助，如果您有任何建议，我们将不胜感激。

第一次编辑（响应 Tanuj 的解决方案）

我的 XML 文件（不确定我们是要使用这个还是只使用 java）：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

<TextView
    android:id="@+id/tvAddARoom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/tvAddARoom" />

<EditText
    android:id="@+id/etAddARoom"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:hint="@string/etAddARoom" />


<Button
    android:id="@+id/btnAddARoom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/btnAdd" />

<TextView
    android:id="@+id/tvSelectARoom"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/tvSelectARoom" />

<TextView
    android:id="@+id/tvNoRooms"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/tvNoRooms" />

<Button
    android:id="@+id/btnViewAll"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/btnViewAll" />

 </LinearLayout>

还有 Java。这根本不正确，因为在 java 中我正在创建整个布局而不是使用上面的布局。只是不确定我是否可以将两者联系起来。

package com.bluej.movingbuddy;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
//import android.widget.ScrollView;
import android.widget.TextView;

public class EstimatorByRoom extends Activity implements OnClickListener {
String roomName;
EditText etAddARoom;
LinearLayout layout;
LinearLayout.LayoutParams layoutParam;


@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    //setContentView(R.layout.estimatorbyroom);

    LayoutParams params = 
            new LinearLayout.LayoutParams(
                    LayoutParams.FILL_PARENT,
                    LayoutParams.WRAP_CONTENT);

    //create a layout
    LinearLayout layout = new LinearLayout(this);
    layout.setOrientation(LinearLayout.VERTICAL);

    //create a text view
    TextView tvAddARoom = new TextView(this);
    tvAddARoom.setText("Add a Room");
    tvAddARoom.setLayoutParams(params);

    //create an edittext
    EditText etAddARoom = new EditText(this);
    etAddARoom.setHint("Living Room, Dining Room, etc.");
    etAddARoom.setLayoutParams(params);


    //create a button
    Button btnAddARoom = new Button(this);
    btnAddARoom.setText("Add");
    btnAddARoom.setLayoutParams(params);

    //adds the textview
    layout.addView(tvAddARoom);

    //add the edittext
    layout.addView(etAddARoom);
    //add the button
    layout.addView(btnAddARoom);

    //create the layout param for the layout
    LinearLayout.LayoutParams layoutParam = new LinearLayout.LayoutParams(
            LayoutParams.FILL_PARENT,
            LayoutParams.WRAP_CONTENT);

    this.addContentView(layout, layoutParam);
}

public void onClick(View v) {
    // TODO Auto-generated method stub
    switch (v.getId()) {

    case R.id.btnAddARoom:
        //add a room

        //this part isn't working!
        roomName = etAddARoom.getText().toString();
        Button createdButton = new Button(this);
        createdButton.setText(roomName);
        layout.addView(createdButton);
        this.addContentView(layout, layoutParam);

        //if no rooms make tvnorooms disappear

        break;
    }

}
}

Answer 1

试试这个：

    //the layout on which you are working
    LinearLayout layout = (LinearLayout) findViewById(R.id.linear_layout_tags);

    //set the properties for button
    Button btnTag = new Button(this);
    btnTag.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    btnTag.setText("Button");
    btnTag.setId(some_random_id);

    //add button to the layout
    layout.addView(btnTag);

Answer 2

试试这个代码：

LinearLayout l_layout = (LinearLayout) findViewById(R.id.linear_layout); 
l_layout.setOrientation(LinearLayout.VERTICAL); // or HORIZONTAL

Button btn1 = new Button(this);
btn1.setText("Button_text");

l_layout.addView(btn1);

btn1.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
           // put code on click operation
     }
});

这是一种动态创建按钮并添加到布局中的方法。

请记住，当您以编程方式创建按钮时，您只需使用 this 而不是 Class_name.this

Answer 3

public class AndroidWalkthroughApp1 extends Activity implements View.OnClickListener {

    final int TOP_ID = 3;
    final int BOTTOM_ID = 4;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // create two layouts to hold buttons
        LinearLayout top = new LinearLayout(this);
        top.setId(TOP_ID);
        LinearLayout bottom = new LinearLayout(this);
        bottom.setId(BOTTOM_ID);

        // create buttons in a loop
        for (int i = 0; i < 2; i++) {
            Button button = new Button(this);
            button.setText("Button " + i);
            // R.id won't be generated for us, so we need to create one
            button.setId(i);

            // add our event handler (less memory than an anonymous inner class)
            button.setOnClickListener(this);

            // add generated button to view
            if (i == 0) {
                top.addView(button);
            }
            else {
                bottom.addView(button);
            }
        }

        // add generated layouts to root layout view
        LinearLayout root = (LinearLayout)this.findViewById(R.id.root_layout);
        root.addView(top);
        root.addView(bottom);
    }

    @Override
    public void onClick(View v) {
        // show a message with the button's ID
        Toast toast = Toast.makeText(AndroidWalkthroughApp1.this, "You clicked button " + v.getId(), Toast.LENGTH_LONG);
        toast.show();

        // get the parent layout and remove the clicked button
        LinearLayout parentLayout = (LinearLayout)v.getParent();
        parentLayout.removeView(v);
    }
}

Answer 4

每个按钮都需要有一个 onclicklistener 来告诉它该做什么。这可以添加到您声明按钮的Java代码中。

Button createdButton = new Button(this);
createdButton.setOnClickListener(new OnClickListener()
{

code you want implemented

}

Answer 5

我会在 xml 中为您的 LinearLayout 添加一个 id：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@id/llContainer"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >

然后将您的 onClick 更改为：

public void onClick(View v) {
    switch (v.getId()) {

    case R.id.btnAddARoom:
        //add a room
        //Find you parent layout which we'll be adding your button to:
        LinearLayout layout = (LinearLayout) findViewById(R.id.llContainer);

        roomName = etAddARoom.getText().toString();
        Button createdButton = new Button(this);
        createdButton.setText(roomName);
        createdButton.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,         LayoutParams.WRAP_CONTENT));
        layout.addView(createdButton);

        //if no rooms make tvnorooms disappear

        break;
    }
}