android中RadioGroup、RadioButton、Spinner、EditText用法详解（含示例截图和源代码）

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android中RadioGroup、RadioButton、Spinner、EditText用法详解（含示例截图和源代码）

2018年04月20日 ⁄ 综合 ⁄ 共 15768字 ⁄ 字号小中大 ⁄ 评论关闭

为了保护版权、尊重原创，转载请注明出处：http://blog.csdn.net/u013149325/article/details/43237757，谢谢！

今天在项目中用到了android中常用的RadioGroup、RadioButton、Spinner、EditText等控件，在此介绍一下它们的用法，希望对需要的朋友有帮助。

一、RadioGroup和RadioButton的使用

RadioButton就是我们常见的单选按钮，一个RadioGroup可以包含多个单选按钮，但是每次只能选择其中的一个值。

我们先看一下布局文件：

<span style="font-size:18px;"><RadioGroup
            android:id="@+id/quickResponseRG"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/ignore_quick_response"
            android:orientation="horizontal" >

            <RadioButton
                android:id="@+id/yesRadioButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/ignore_yes"
                android:textSize="22sp" />

            <RadioButton
                android:id="@+id/noRadioButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/ignore_no"
                android:textSize="22sp" />
        </RadioGroup></span>

再来看一下RadioGroup的监听器接口：RadioGroup.OnCheckedChangeListener

 public interface OnCheckedChangeListener {
        /**
         * <p>Called when the checked radio button has changed. When the
         * selection is cleared, checkedId is -1.</p>
         *
         * @param group the group in which the checked radio button has changed
         * @param checkedId the unique identifier of the newly checked radio button
         */
        public void onCheckedChanged(RadioGroup group, int checkedId);
    }

我们需要实现RadioGroup.OnCheckedChangeListener接口，重写onCheckedChanged(RadioGroup group, int checkedId)函数，参数group指定添加监听器的RadioGroup，参数checkedId指定选中的RadioButton的ID。

二、Spinner的使用

Spinner是下拉列表选择框，可以绑定数据源，数据源可以在程序中定义，也可以在values/strings中定义字符串数组，还可以在数据库中查询获取。

布局很简单，详见后面的例子。

绑定数据源：

String[] intervalTime = getResources().getStringArray(R.array.intervalTime);
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, intervalTime);
		bstIntervalSpinner.setAdapter(adapter);

设置监听器接口：AdapterView.OnItemSelectedListener

public interface OnItemSelectedListener {
        /**
         * <p>Callback method to be invoked when an item in this view has been
         * selected. This callback is invoked only when the newly selected
         * position is different from the previously selected position or if
         * there was no selected item.</p>
         *
         * Impelmenters can call getItemAtPosition(position) if they need to access the
         * data associated with the selected item.
         *
         * @param parent The AdapterView where the selection happened
         * @param view The view within the AdapterView that was clicked
         * @param position The position of the view in the adapter
         * @param id The row id of the item that is selected
         */
        void onItemSelected(AdapterView<?> parent, View view, int position, long id);

        /**
         * Callback method to be invoked when the selection disappears from this
         * view. The selection can disappear for instance when touch is activated
         * or when the adapter becomes empty.
         *
         * @param parent The AdapterView that now contains no selected item.
         */
        void onNothingSelected(AdapterView<?> parent);
    }

我们需要实现AdapterView.OnItemSelectedListener接口，重写onItemSelected(AdapterView<?> parent, View view, int position, long id)方法。

三、EditText的使用

EditText很常见，用来输入文本，给它添加监听器可以实时监测已经输入的文本内容，包括查看是否有错误、输入是否符合规范、长度是否超出了范围。

添加监听器：

powerEditText.addTextChangedListener(editTextListener);

监听器实现TextWatcher接口：

public interface TextWatcher extends NoCopySpan {
    /**
     * This method is called to notify you that, within <code>s</code>,
     * the <code>count</code> characters beginning at <code>start</code>
     * are about to be replaced by new text with length <code>after</code>.
     * It is an error to attempt to make changes to <code>s</code> from
     * this callback.
     */
    public void beforeTextChanged(CharSequence s, int start,
                                  int count, int after);
    /**
     * This method is called to notify you that, within <code>s</code>,
     * the <code>count</code> characters beginning at <code>start</code>
     * have just replaced old text that had length <code>before</code>.
     * It is an error to attempt to make changes to <code>s</code> from
     * this callback.
     */
    public void onTextChanged(CharSequence s, int start, int before, int count);

    /**
     * This method is called to notify you that, somewhere within
     * <code>s</code>, the text has been changed.
     * It is legitimate to make further changes to <code>s</code> from
     * this callback, but be careful not to get yourself into an infinite
     * loop, because any changes you make will cause this method to be
     * called again recursively.
     * (You are not told where the change took place because other
     * afterTextChanged() methods may already have made other changes
     * and invalidated the offsets.  But if you need to know here,
     * you can use {@link Spannable#setSpan} in {@link #onTextChanged}
     * to mark your place and then look up from here where the span
     * ended up.
     */
    public void afterTextChanged(Editable s);
}

我们可以根据需要重写beforeTextChanged(CharSequence s, int start, int count, int after)、onTextChanged(CharSequence s, int start, int before, int count)、afterTextChanged(Editable s)这三个方法。

四、示例和源代码

先上效果图：

在上图中，有3个RadioGroup、2个Spinner和1个EditText，由于程序中设置了监听器，所以上面选项设置的值都会在分割线下面实时显示出结果。

源代码：

布局文件：

<?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" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/ignoreTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/ignore_quick_response"
            android:textSize="22sp" />

        <RadioGroup
            android:id="@+id/quickResponseRG"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/ignore_quick_response"
            android:orientation="horizontal" >

            <RadioButton
                android:id="@+id/yesRadioButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/ignore_yes"
                android:textSize="22sp" />

            <RadioButton
                android:id="@+id/noRadioButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/ignore_no"
                android:textSize="22sp" />
        </RadioGroup>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/BSTintervalTV"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/BST_interval"
            android:textSize="22sp" />

        <Spinner
            android:id="@+id/BSTintervalSpinner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/trans_retry"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/trans_retry_interval"
            android:textSize="22sp" />

        <Spinner
            android:id="@+id/transRetrySpinner"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/powerTV"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/power"
            android:textSize="22sp" />

        <EditText
            android:id="@+id/powerEditText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:inputType="text"
            android:text="@string/default_power"
            android:textSize="22sp" />

        <TextView
            android:id="@+id/powerRangeTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/power_range"
            android:textSize="22sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/channelTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/channel_num"
            android:textSize="22sp" />

        <RadioGroup
            android:id="@+id/channelNumRG"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/ignore_quick_response"
            android:orientation="horizontal" >

            <RadioButton
                android:id="@+id/channelRadioButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/zero"
                android:textSize="22sp" />

            <RadioButton
                android:id="@+id/channelRadioButton2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/one"
                android:textSize="22sp" />
        </RadioGroup>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/crcTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/crc_check"
            android:textSize="22sp" />

        <RadioGroup
            android:id="@+id/crcCheckRG"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/ignore_quick_response"
            android:orientation="horizontal" >

            <RadioButton
                android:id="@+id/crcRadioButton1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/zero"
                android:textSize="22sp" />

            <RadioButton
                android:id="@+id/crcRadioButton2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/one"
                android:textSize="22sp" />
        </RadioGroup>
    </LinearLayout>

    <View 
        android:id="@+id/line"
        android:layout_width="match_parent"
        android:layout_height="2dip"
        android:background="#FF909090"/>
    
    <TextView 
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/setResult"
        android:textSize="22sp"/>
    
    <TextView 
        android:id="@+id/result1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"/>
    
    <TextView 
        android:id="@+id/result2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"/>
    
    <TextView 
        android:id="@+id/result3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"/>
    
    <TextView 
        android:id="@+id/result4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"/>
    
    <TextView 
        android:id="@+id/result5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"/>
    
    <TextView 
        android:id="@+id/result6"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22sp"/>
    
</LinearLayout>

Java类文件：

package readAndWriteOBU;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;

import com.hustxks.etcapp.R;

public class InitActivity extends Activity{
	//忽略快速响应帧单选框
	private RadioGroup quickResponseRadioGroup;
	private RadioButton yesRadioButton;
	private RadioButton noRadioButton;
	
	//BST间隔下拉列表
	private Spinner bstIntervalSpinner;
    //交易重试间隔下拉列表
	private Spinner transIntervalSpinner;
	//功率级数编辑框
	private EditText powerEditText;
	
	//信道号单选框
	private RadioGroup channelNumRadioGroup;
	private RadioButton channelRadioButton1;
	private RadioButton channelRadioButton2;
	
	//CRC校验单选框
	private RadioGroup crcCkeckRadioGroup;
	private RadioButton crcRadioButton1;
	private RadioButton crcRadioButton2;
	
	//是否忽略快速响应帧标志：00：忽略快速响应 01：完全透传
	public static String ignoreQuickResFlag = "0";
	//BST间隔，单位ms，范围1~10ms
	public static String bstInterval = "10";
	//交易重试间隔，单位ms，范围1~10ms
	public static String transRetryInterval = "10";
	//功率级数，范围0~31
	public static String power = "5";
	//信道号，取值0,1
	public static String channelID = "0";
	//CRC校验标志位，取值0，1
	public static String crcCheckFlag = "0";
	
	private String[] intervalTime;
	
	//显示设置结果文本框
	TextView resultTextView1;
	TextView resultTextView2;
	TextView resultTextView3;
	TextView resultTextView4;
	TextView resultTextView5;
	TextView resultTextView6;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.init_activity);
		initView();
		RadioGroupListener quickRadioGroupListener = new RadioGroupListener(quickResponseRadioGroup);
		RadioGroupListener channelRadioGroupListener = new RadioGroupListener(channelNumRadioGroup);
		RadioGroupListener crcRadioGroupListener = new RadioGroupListener(crcCkeckRadioGroup);
		EditTextListener editTextListener = new EditTextListener();
		
		quickResponseRadioGroup.setOnCheckedChangeListener(quickRadioGroupListener);
		channelNumRadioGroup.setOnCheckedChangeListener(channelRadioGroupListener);
		crcCkeckRadioGroup.setOnCheckedChangeListener(crcRadioGroupListener);
		powerEditText.addTextChangedListener(editTextListener);
		
		intervalTime = getResources().getStringArray(R.array.intervalTime);
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, intervalTime);
		bstIntervalSpinner.setAdapter(adapter);
		transIntervalSpinner.setAdapter(adapter);
		SpinnerListener bstSpinnerListener = new SpinnerListener(bstIntervalSpinner);
		bstIntervalSpinner.setOnItemSelectedListener(bstSpinnerListener);
		SpinnerListener retrySpinnerListener = new SpinnerListener(transIntervalSpinner);
		transIntervalSpinner.setOnItemSelectedListener(retrySpinnerListener);
	}
	
	private void initView() {
		quickResponseRadioGroup = (RadioGroup)findViewById(R.id.quickResponseRG);
		yesRadioButton = (RadioButton)findViewById(R.id.yesRadioButton);
		noRadioButton = (RadioButton)findViewById(R.id.noRadioButton);
		
		bstIntervalSpinner = (Spinner)findViewById(R.id.BSTintervalSpinner);
		transIntervalSpinner = (Spinner)findViewById(R.id.transRetrySpinner);
		powerEditText = (EditText)findViewById(R.id.powerEditText);
		
		channelNumRadioGroup = (RadioGroup)findViewById(R.id.channelNumRG);
		channelRadioButton1 = (RadioButton)findViewById(R.id.channelRadioButton1);
		channelRadioButton2 = (RadioButton)findViewById(R.id.channelRadioButton2);
		
		crcCkeckRadioGroup = (RadioGroup)findViewById(R.id.crcCheckRG);
		crcRadioButton1 = (RadioButton)findViewById(R.id.crcRadioButton1);
		crcRadioButton2 = (RadioButton)findViewById(R.id.crcRadioButton2);
		
		resultTextView1 = (TextView)findViewById(R.id.result1);
		resultTextView2 = (TextView)findViewById(R.id.result2);
		resultTextView3 = (TextView)findViewById(R.id.result3);
		resultTextView4 = (TextView)findViewById(R.id.result4);
		resultTextView5 = (TextView)findViewById(R.id.result5);
		resultTextView6 = (TextView)findViewById(R.id.result6);
	}
	
	//监听RadioGroup的类
	class RadioGroupListener implements RadioGroup.OnCheckedChangeListener {
		private RadioGroup myRadioGroup;
		public RadioGroupListener(RadioGroup radioGroup) {
			// TODO Auto-generated constructor stub
			this.myRadioGroup = radioGroup;
		}
		@Override
		public void onCheckedChanged(RadioGroup group, int checkedId) {
			// TODO Auto-generated method stub
			switch (myRadioGroup.getId()) {
			case R.id.quickResponseRG:
				if (checkedId == R.id.yesRadioButton) {
					ignoreQuickResFlag = "00";
				}
				else if (checkedId == R.id.noRadioButton) {
					ignoreQuickResFlag = "01";
				}
				resultTextView1.setText(ignoreQuickResFlag);
				break;
			case R.id.channelNumRG:
				if (checkedId == R.id.channelRadioButton1) {
					channelID = channelRadioButton1.getText().toString().trim();
				}
				else if (checkedId == R.id.channelRadioButton2) {
					channelID = channelRadioButton2.getText().toString().trim();
				}
				resultTextView5.setText(channelID);;
				break;
			case R.id.crcCheckRG:
				if (checkedId == R.id.crcRadioButton1) {
					crcCheckFlag = crcRadioButton1.getText().toString().trim();
				}
				else if (checkedId == R.id.crcRadioButton2) {
					crcCheckFlag = crcRadioButton2.getText().toString().trim();
				}
				resultTextView6.setText(crcCheckFlag);
				break;
			default:
				break;
			}
		}
	}
	
	//监听EditText的类
	class EditTextListener implements TextWatcher {
		@Override
		public void beforeTextChanged(CharSequence s, int start,
                int count, int after) {
			
		}
		@Override
		public void onTextChanged(CharSequence s, int start, int before, int count) {
			
		}
		@Override
		public void afterTextChanged(Editable s) {
			power = powerEditText.getText().toString().trim();
			resultTextView4.setText(power);
		}
	}
	
	//监听Spinner的类
	class SpinnerListener implements AdapterView.OnItemSelectedListener {
		private Spinner mySpinner;
		public SpinnerListener(Spinner spinner) {
			// TODO Auto-generated constructor stub
			this.mySpinner = spinner;
		}
		@Override
		public void onItemSelected(AdapterView<?> parent, View view,
				int position, long id) {
			if (mySpinner.getId() == R.id.BSTintervalSpinner) {
				bstInterval = intervalTime[position];
				resultTextView2.setText(bstInterval);
			}
			else if (mySpinner.getId() == R.id.transRetrySpinner) {
				transRetryInterval = intervalTime[position];
				resultTextView3.setText(transRetryInterval);
			}
		}
		@Override
		public void onNothingSelected(AdapterView<?> parent) {
			
		}
	}
}

到此结束，转载请注明出处，谢谢！

【上篇】C++内存泄露和检测
【下篇】C++：派生类的默认构造函数和拷贝构造函数调用基类构造函数的机制（含程序验证）

作者: artec

该日志由 artec 于6年前发表在综合分类下，最后更新于 2018年04月20日.
转载请注明: android中RadioGroup、RadioButton、Spinner、EditText用法详解（含示例截图和源代码） | 学步园 +复制链接

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android中RadioGroup、RadioButton、Spinner、EditText用法详解（含示例截图和源代码）

作者: artec

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