android动态radiobutton

除了通过从调色板中拖放来创建RadioButton之外，android还可以帮助你以编程方式（动态）创建它。为了创建动态RadioButton，我们需要使用android.view.ViewGroup.LayoutParams，它配置视图的宽度和高度并实现RadioGroup类的setOnCheckedChangeListener（）方法。

动态单选按钮的示例

让我们看一个动态RadioButton的例子。

activity_main.xml

文件：activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:id="@+id/relativeLayout"
    tools:context="com.example.test.dynamicradiobutton.MainActivity">

</RelativeLayout>

活动类

文件：MainActivity.java

package com.example.test.dynamicradiobutton;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RelativeLayout;

import android.widget.RelativeLayout.LayoutParams;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    RadioGroup rg;
    RelativeLayout rl;
    RadioButton rb1, rb2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        rg = new RadioGroup(this);
        rl = (RelativeLayout) findViewById(R.id.relativeLayout);
        rb1 = new RadioButton(this);
        rb2 = new RadioButton(this);

        rb1.setText("Male");
        rb2.setText("Female");
        rg.addView(rb1);
        rg.addView(rb2);
        rg.setOrientation(RadioGroup.HORIZONTAL);

        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams((int) LayoutParams.WRAP_CONTENT, (int)LayoutParams.WRAP_CONTENT);
        params.leftMargin =150;
        params.topMargin = 100;

        rg.setLayoutParams(params);
        rl.addView(rg);

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton radioButton = (RadioButton) findViewById(checkedId);
                Toast.makeText(getApplicationContext(), radioButton.getText(), Toast.LENGTH_LONG).show();
            }
        });
    }
}