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

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       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1~10mspublic static String bstInterval = "10";//交易重试间隔，单位ms，范围1~10mspublic static String transRetryInterval = "10";//功率级数，范围0~31public static String power = "5";//信道号，取值0,1public static String channelID = "0";//CRC校验标志位，取值0，1public 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;@Overridepublic 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 stubthis.myRadioGroup = radioGroup;}@Overridepublic void onCheckedChanged(RadioGroup group, int checkedId) {// TODO Auto-generated method stubswitch (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 {@Overridepublic void beforeTextChanged(CharSequence s, int start,                int count, int after) {}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {}@Overridepublic 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 stubthis.mySpinner = spinner;}@Overridepublic 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);}}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}}}

     到此结束，转载请注明出处，谢谢！