RadioButton是最普通的UI组件之一,继承了Button类,可以直接使用Button支持的各种属性和方法。
RadioButton与普通按钮不同的是,它多了一个可以选中的功能,可额外指定一个android:checked属性,该属性可以指定初始状态时是否被选中,其实也可以不用指定,默认初始状态都不选中。
使用RadioButton必须和单选框RadioGroup一起使用,在RadioGroup中放置RadioButton,通过setOnCheckedChangeListener( )
来响应按钮的事件;
(1)选用radioGroup的图标
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< 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" > < TextView android:id = "@+id/textView1" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_alignParentLeft = "true" android:layout_alignParentTop = "true" android:layout_marginTop = "44dp" android:text = "性别:" android:textSize = "20dp" /> < RadioGroup android:id = "@+id/radioGroup1" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:layout_alignTop = "@+id/textView1" android:layout_marginLeft = "21dp" android:layout_toRightOf = "@+id/textView1" android:orientation = "horizontal" > < RadioButton android:id = "@+id/radio0" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:checked = "true" android:onClick = "onRadioButtonClicked" android:text = "男" /> < RadioButton android:id = "@+id/radio1" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:onClick = "onRadioButtonClicked" android:text = "女" /> < RadioButton android:id = "@+id/radio2" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:onClick = "onRadioButtonClicked" android:text = "保密" /> </ RadioGroup > </ RelativeLayout > |
(2)控制的类是
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package com.lc.radiobutton; import com.example.radiobutton.R; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.RadioButton; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout.activity_main); } /* * 设置radio的点击事件,当点击的时候显示文字 */ public void onRadioButtonClicked(View view) { RadioButton button = (RadioButton) view; boolean isChecked = button.isChecked(); switch (view.getId()) { case R.id.radio0: if (isChecked) { Toast.makeText(MainActivity. this , button.getText(), 1 ).show(); } break ; case R.id.radio1: if (isChecked) { Toast.makeText(MainActivity. this , button.getText(), 1 ).show(); } break ; case R.id.radio2: if (isChecked) { Toast.makeText(MainActivity. this , button.getText(), 1 ).show(); } break ; default : break ; } } @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 ; } } |
(3)显示结果,当点击的时候显示文字
总结
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原文链接:https://blog.csdn.net/xlgen157387/article/details/42062209