无法将单独布局中的按钮添加到当前视图

Question

请看下面的代码

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <TableLayout 
        android:id="@+id/gameBoard"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        ></TableLayout>
</RelativeLayout>

game_buttons.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/buttonLayout" >
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="34dp"
        android:layout_marginTop="18dp"
        android:text="Button" />
</RelativeLayout>

主活动.java

package com.ace.ticktacktoe;
import android.os.Bundle;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.widget.Button;
import android.widget.GridView;
import android.widget.RelativeLayout;
import android.widget.TableLayout;
import android.widget.TableRow;
public class MainActivity extends Activity {
    private LayoutInflater inflater;
    private TableLayout gameBoard;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        createUI();
        //Create the user interface
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    private void createUI()
    {
        gameBoard = (TableLayout)findViewById(R.id.gameBoard);
        inflater = getLayoutInflater();
        RelativeLayout layout = (RelativeLayout)inflater.inflate(R.layout.game_buttons, null);

        //Add the buttons
        TableRow tableRow = new TableRow(this);
        Button btn = (Button)layout.findViewById(R.id.button1);
        ((RelativeLayout)btn.getParent()).removeView(btn);
        tableRow.addView(btn);
        gameBoard.addView(tableRow);
    }
}

当我运行此代码时，应该显示添加的按钮。但是，我的显示器完全是空白的。我在这里做错了什么？

Answer 1

((RelativeLayout)btn.getParent()).removeView(btn);
tableRow.addView(btn);

更改为

tableRow.addView(layout);

或将game_buttons.xml更改为仅包含没有布局的按钮，并使用膨胀创建不带环绕布局的按钮。

Answer 2

尝试将按钮移动到activity_main.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <TableLayout 
        android:id="@+id/gameBoard"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        ></TableLayout>
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="34dp"
        android:layout_marginTop="18dp"
        android:text="Button" />
</RelativeLayout>