Android studio单选按钮
wj778 人气:2创建空activity
编辑activity_main.xml文件
代码如下:
<?xml version="1.0" encoding="utf-8"?> <androidx.appcompat.widget.LinearLayoutCompat 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="wrap_content" android:orientation="vertical" android:gravity="center" tools:context=".MainActivity"> <TextView android:id="@+id/chooseTxt" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="@string/text1" android:textColor="@color/colorblack" android:textSize="30sp" /> //定义RaidGroup是要注意属性添加的位置 <RadioGroup android:id="@+id/radioGroup" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:gravity="center" > <RadioButton android:id="@+id/radioButton1" android:layout_width="wrap_content" android:layout_height="match_parent" android:button="@null" android:drawableRight="@android:drawable/btn_radio" android:text="@string/text2" /> <RadioButton android:id="@+id/radioButton2" android:layout_width="wrap_content" android:layout_height="match_parent" android:text="@string/text3" /> </RadioGroup> <Button android:id="@+id/ClearBtn" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/text4" /> <Button android:id="@+id/AddBtn" android:layout_width="match_parent" android:layout_height="match_parent" android:text="@string/text5" /> </androidx.appcompat.widget.LinearLayoutCompat>
还有strings.xml文件,代码如下:
<resources> <string name="app_name">My App</string> <string name="text1">我选择的是...?</string> <string name="text2">按钮1</string> <string name="text3">按钮2</string> <string name="text4">清除选中</string> <string name="text5">添加子项</string> </resources>
再是MainActivity.java文件,代码如下:
package com.example.myapp; import androidx.appcompat.app.AppCompatActivity; 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.RadioButton; import android.widget.RadioGroup; import android.widget.RadioGroup.OnCheckedChangeListener; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private RadioGroup radioGroup; private RadioButton radioButton1; private RadioButton radioButton2; private Button radioClearBtn; private Button radioAddBtn; private TextView chooseTxt; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); radioButton1 = findViewById(R.id.radioButton1); radioButton2 = findViewById(R.id.radioButton2); radioGroup= findViewById(R.id.radioGroup); //设置选中变换监听 radioGroup.setOnCheckedChangeListener(onCheckedChangeListener); //分别为两个按钮设置点击监听 radioClearBtn = findViewById(R.id.ClearBtn); radioClearBtn.setOnClickListener(onClickListener); radioAddBtn = findViewById(R.id.AddBtn); radioAddBtn.setOnClickListener(onClickListener); chooseTxt = findViewById(R.id.chooseTxt); } //onCheckedChangeListener()方法 private OnCheckedChangeListener onCheckedChangeListener=new OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { //定义id并赋值被选中的单选按钮的id int id = group.getCheckedRadioButtonId(); switch (id) { case R.id.radioButton1: chooseTxt.setText("我选择的是:" + radioButton1.getText()); break; case R.id.radioButton2: chooseTxt.setText("我选择的是:" + radioButton2.getText()); break; default: chooseTxt.setText("我选择的是:新增"); break; } } }; private OnClickListener onClickListener = new OnClickListener() { @Override public void onClick(View view) { switch (view.getId()) { case R.id.ClearBtn: radioGroup.check(-1);//清除选项 chooseTxt.setText("我选择的是...?"); break; case R.id.AddBtn: RadioButton newRadio = new RadioButton(MainActivity.this); //将新增的radiobutton加入到radioGroup中 newRadio.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT)); newRadio.setText("新增"); radioGroup.addView(newRadio, radioGroup.getChildCount()); break; default: break; } } }; }
运行结果如下:
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