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標題: Android App - radioGroup [打印本頁]

作者: admin 時間: 2012-1-30 14:33 標題: Android App - radioGroup

以下程式可以

(1) 在程式內即時加一個新radio button (snack) 放在現有的 radio buttons 之間的指定位置
(2) 按鍵清除 radio group 內所有 selection
(3) Select 任何一個r adio button 會顯示它的  ID

[attach]1006[/attach]

Java 檔案內容

package sample.radiogpadvance;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class RadioGroupAdvanceActivity extends Activity implements RadioGroup.OnCheckedChangeListener,
      View.OnClickListener {
private TextView mChoice;
private RadioGroup mRadioGroup;
@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      mRadioGroup = (RadioGroup) findViewById(R.id.menu);
      // test adding a radio button programmatically
      RadioButton newRadioButton = new RadioButton(this);
      newRadioButton.setText(R.string.radio_group_snack);
      newRadioButton.setTextColor(Color.RED);
      newRadioButton.setId(999999);
      // 以下兩句可決定新加入的radio button 放在那那個位置
      LinearLayout.LayoutParams layoutParams = new RadioGroup.LayoutParams(
            RadioGroup.LayoutParams.WRAP_CONTENT,
            RadioGroup.LayoutParams.WRAP_CONTENT);
      mRadioGroup.addView(newRadioButton, 1, layoutParams); // 首位為0, 1為第二位
      // 如以上兩包改為下一包, 則只會放在radio group 最後的位置
      // RadioGroup.addView(newRadioButton);

      mRadioGroup.check(newRadioButton.getId()); // 把新加入的 newRadioButton 變為Selected
      // test listening to checked change events
      String selection = getString(R.string.radio_group_selection); // res/strings.xml 找到預先定義的文字放入 selection
      mRadioGroup.setOnCheckedChangeListener(this);
      // test clearing the selection
      Button clearButton = (Button) findViewById(R.id.clear);
      clearButton.setOnClickListener(this);
}
public void onCheckedChanged(RadioGroup group, int checkedId) {
      String selection = getString(R.string.radio_group_selection); // res/strings.xml 找到預先定義的文字放入 selection
      String none = getString(R.string.radio_group_none);          // res/strings.xml 找到預先定義的文字放入 none
      mChoice = (TextView) findViewById(R.id.choice);
      mChoice.setText(selection + "  "+ (checkedId == View.NO_ID ? none : checkedId));
}
// clear any selection within radio group
public void onClick(View v) {
      mRadioGroup.clearCheck();
}
}

main.xml 檔案內容
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RadioGroup
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical"
      android:checkedButton="@+id/lunch"
      android:id="@+id/menu">
      <RadioButton
         android:text="@string/radio_group_1_breakfast"
         android:id="@+id/breakfast"
         />
      <RadioButton
         android:text="@string/radio_group_1_lunch"
         android:id="@id/lunch" />
      <RadioButton
         android:text="@string/radio_group_1_dinner"
         android:id="@+id/dinner" />
      <RadioButton
         android:text="@string/radio_group_1_all"
         android:id="@+id/all" />
      <TextView
         android:text="@string/radio_group_1_selection"
         android:id="@+id/choice" />
</RadioGroup>
<Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="@string/radio_group_1_clear"
      android:id="@+id/clear" />
</LinearLayout>

Strings.xml 檔案內容
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, RadioGroupAdvanceActivity!</string>
<string name="app_name">RadioGroupAdvance</string>
<string name="radio_group_1_breakfast">Breakfast</string>
<string name="radio_group_1_lunch">Lunch</string>
<string name="radio_group_1_dinner">Dinner</string>
<string name="radio_group_1_selection">Selection</string>
<string name="radio_group_1_all">All</string>
<string name="radio_group_1_clear">Clear</string>
<string name="radio_group_snack">Snack</string>
<string name="radio_group_none">None</string>
<string name="radio_group_selection">Selection</string>
<string name="snack">snack</string>
</resources>

作者: admin 時間: 2012-2-12 13:54

利用 Radio Group, Group 內所有選項只有從上而下排列, 要自己排列Radio 選項, 亦不能用 Radio Group, 但編程上要花點功夫, 可看看下面的例子

[attach]1007[/attach]

Java 檔內容

package sample.radogroup;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.RadioButton;
import android.widget.Toast;

public class RadiogroupActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

      final RadioButton radiofood1 = (RadioButton) findViewById(R.id.radio1);
      final RadioButton radiofood2 = (RadioButton) findViewById(R.id.radio2);
      final RadioButton radiofood3 = (RadioButton) findViewById(R.id.radio3);
      final RadioButton radiofood4 = (RadioButton) findViewById(R.id.radio4);
      final RadioButton radiofood5 = (RadioButton) findViewById(R.id.radio5);

      radiofood1.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
         radiofood2.setChecked(false);
         radiofood3.setChecked(false);
         radiofood4.setChecked(false);
         radiofood5.setChecked(false);
         Toast.makeText(RadiogroupActivity.this, radiofood1.getText(), Toast.LENGTH_SHORT).show();
   }
   });

       radiofood2.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
         radiofood1.setChecked(false);
          radiofood3.setChecked(false);
          radiofood4.setChecked(false);
          radiofood5.setChecked(false);
         Toast.makeText(RadiogroupActivity.this, radiofood2.getText(), Toast.LENGTH_SHORT).show();
   }
   });

       radiofood3.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
         radiofood1.setChecked(false);
          radiofood2.setChecked(false);
          radiofood4.setChecked(false);
          radiofood5.setChecked(false);
         Toast.makeText(RadiogroupActivity.this, radiofood3.getText(), Toast.LENGTH_SHORT).show();
   }
   });

       radiofood4.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
         radiofood1.setChecked(false);
          radiofood2.setChecked(false);
          radiofood3.setChecked(false);
          radiofood5.setChecked(false);
         Toast.makeText(RadiogroupActivity.this, radiofood4.getText(), Toast.LENGTH_SHORT).show();
   }
   });

       radiofood5.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
         radiofood1.setChecked(false);
          radiofood2.setChecked(false);
          radiofood3.setChecked(false);
          radiofood4.setChecked(false);
         Toast.makeText(RadiogroupActivity.this, radiofood5.getText(), Toast.LENGTH_SHORT).show();
   }
   });

  }}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android">

<FrameLayout
      android:id="@+id/frameLayout1"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_weight="0.55" >

      <LinearLayout
         android:id="@+id/linearLayout5"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:orientation="vertical" >

         <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <RadioButton
                  android:id="@+id/radio1"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:checked="true"
                  android:text="@string/radiobutton1"
                  android:textSize="18dip" />

         </LinearLayout>

         <LinearLayout
            android:id="@+id/linearLayout2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <RadioButton
                  android:id="@+id/radio2"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="@string/radiobutton2"
                  android:textSize="18dip" />

            <RadioButton
                  android:id="@+id/radio3"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="@string/radiobutton3"
                  android:textSize="18dip" />
         </LinearLayout>

         <LinearLayout
            android:id="@+id/linearLayout3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <RadioButton
                  android:id="@+id/radio4"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="@string/radiobutton4"
                  android:textSize="18dip" />

            <RadioButton
                  android:id="@+id/radio5"
                  android:layout_width="wrap_content"
                  android:layout_height="wrap_content"
                  android:text="@string/radiobutton5"
                  android:textSize="18dip" />
         </LinearLayout>
      </LinearLayout>
</FrameLayout>
</LinearLayout>

Stringx.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Food</string>
<string name="radiobutton1">Cake</string>
<string name="radiobutton2">Biscuit</string>
<string name="radiobutton3">Chocolate</string>
<string name="radiobutton4">Ice-cream</string>
<string name="radiobutton5">Sweet</string>
</resources>

作者: admin 時間: 2012-8-26 09:15

基本操作
(1) 在同一組中選擇第一個option,

RadioButton opt1 = (RadioButton) findViewById(R.id.radio0);
RadioButton opt2 = (RadioButton) findViewById(R.id.radio1);
opt1 .setChecked(true);
opt2 .setChecked(false);

(2) 檢查那一個option 被選了
if (opt1 .isChecked()) {......}

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