Android系统自带的RadioGroup只有两种排列方式:横向或纵向。 但是现实中可能需要将RadioGroup按网格状排列, 如何实现?
本文将介绍实现方法。
先看效果图:
思路:
1. 创建一个PopupWindow的弹出窗口
2. 在PopupWindow中填充一个GridView
3. 在GridView内填充多个由img和text组合而成的、外形类似于RadioButton的组合View视图
4. 当选项有改变的饿时候,更新GridView内的视图。
实现过程:
1. 创建由Img和Text组合而成的、外形类似于RadioButton的组合View视图(下面简称URadioButton)
先看URadioButton的布局,左图标右文字:只需要把图片或文字填充到<ImageView>或<TextView>中就可以实现内容不同的URadioButton。
item_radiobutton.xml:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/item_radiobutton" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageView android:id="@+id/item_radioimg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" /> <TextView android:layout_toRightOf="@+id/item_radioimg" android:id="@+id/item_radiotext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" /> </RelativeLayout>
我们的目标是把多个这个的URadioButton填充到GridView中,然而从GridView的填充函数:
GridView.setAdapter(ListAdapter adapter)
中,可以看出需要将一个Adapter填充到GridView中。那么先编写一个方法:该方法能够生成由多URadioButton组成的Adapter。
/* * 创建包含多个radiobutton的Adapter。 * RadioButton的图片有redioImg指定,RadioButton的文字由radioNameArray指定 * RadioButton的图片和文字的相对位置在item_radiobutton.xml布局文件中指定。 */ private SimpleAdapter getRadioButtonAdapter(int redioImage, String[] radioNameArray) { ArrayList<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>(); for (int i = 0; i < radioNameArray.length; i++) { HashMap<String, Object> map = new HashMap<String, Object>(); map.put("itemRadioImg", redioImage); map.put("itemRadioText", radioNameArray[i]); data.add(map); } SimpleAdapter simperAdapter = new SimpleAdapter(this, data, R.layout.item_radiobutton, new String[] { "itemRadioImg", "itemRadioText" }, new int[] { R.id.item_radioimg, R.id.item_radiotext }); return simperAdapter; }
下面的代码为:调用上面定义的getRadioButtonAdapter方法生成我们所需要Adapter:
private SimpleAdapter mWishesAdapter; private String[] mWishes = {"睡到自然醒", "钱多手抽筋", "加薪又升职", "妞多任我选"}; ... ... mWishesAdapter = getRadioButtonAdapter(R.drawable.btn_radio_off, mWishes);
其中R.drawable.btn_radio_off图标为:
2. 在GridView中填充URadioButtons
这里就直接贴代码了:
mWishesAdapter = getRadioButtonAdapter(R.drawable.btn_radio_off, mWishes); LayoutInflater mLayoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE); mViewGroup = (ViewGroup) mLayoutInflater.inflate(R.layout.radiogroup_gridview, null, true); mGrid = (GridView)mViewGroup.findViewById(R.id.gridview); mGrid.setAdapter(mWishesAdapter); mGrid.requestFocus(); mGrid.setOnItemClickListener( new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) { if(mLastItme != arg2){ //更新图标、实现单选 if(mLastItme>=0){ ChangeRadioImg(mWishesAdapter, mLastItme,false); } mLastItme = arg2; ChangeRadioImg(mWishesAdapter,arg2,true); } } });
为了实现单选,所以每当选择了新选项的时候,就将以前的选中的选项的图标改为:off, 本次选中的选型的图标改为On,而实现这个功能的方法为:
ChangeRadioImg():
/* * 根据选中的状态来更新图标。也就是实现我们自定义RadioGroup的单选功能 */ private void ChangeRadioImg(SimpleAdapter adapter,int selectedItem, boolean on) { HashMap<String, Object> map = (HashMap<String, Object>)adapter.getItem(selectedItem); if(on) map.put("itemRadioImg", R.drawable.btn_radio_on); else map.put("itemRadioImg", R.drawable.btn_radio_off); adapter.notifyDataSetChanged(); }
经过上面得两个步骤,我们已经构造了网格状的RadioGroup,下面我们将通过一个PopupWindow将其显示出来。
//注意,PopupWindow的第一个参数必须是没有父亲的view对象即顶层View。 mPopGridRadioGroup = new PopupWindow(mViewGroup, LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT,true); mPopGridRadioGroup.setBackgroundDrawable(new BitmapDrawable()); mPopGridRadioGroup.setTouchInterceptor(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_OUTSIDE) { mPopGridRadioGroup.dismiss(); return true; } return false; } }); mPopGridRadioGroup.showAtLocation(findViewById(R.id.mainView), Gravity.CENTER, 0, 0); mPopGridRadioGroup.update();
package com.cnblogs.hibraincol; import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.os.Bundle; import android.widget.GridView; import android.widget.PopupWindow; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.Button; import android.view.View; import android.widget.SimpleAdapter; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.graphics.drawable.BitmapDrawable; import android.view.View.OnTouchListener; import android.view.Gravity; public class GridRadioGroup extends Activity { private PopupWindow mPopGridRadioGroup=null; private ViewGroup mViewGroup=null; private GridView mGrid=null; private SimpleAdapter mWishesAdapter; private int mLastItme=-1; private String[] mWishes = {"睡到自然醒", "钱多手抽筋", "加薪又升职", "妞多任我选"}; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button btnPop= (Button)findViewById(R.id.btn_pop); btnPop.setOnClickListener(new Button.OnClickListener(){ public void onClick(View v){ popGridRadioGroup(); } }); } private void popGridRadioGroup(){ if(mPopGridRadioGroup==null){ LayoutInflater mLayoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE); mWishesAdapter = getRadioButtonAdapter(R.drawable.btn_radio_off, mWishes); mViewGroup = (ViewGroup) mLayoutInflater.inflate(R.layout.radiogroup_gridview, null, true); mGrid = (GridView)mViewGroup.findViewById(R.id.gridview); mGrid.setAdapter(mWishesAdapter); mGrid.requestFocus(); mGrid.setOnItemClickListener( new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) { if(mLastItme != arg2){ //更新图标、实现单选 if(mLastItme>=0){ ChangeRadioImg(mWishesAdapter, mLastItme,false); } mLastItme = arg2; ChangeRadioImg(mWishesAdapter,arg2,true); } } }); //注意,PopupWindow的第一个参数必须是没有父亲的view对象即顶层View。 mPopGridRadioGroup = new PopupWindow(mViewGroup, LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT,true); mPopGridRadioGroup.setBackgroundDrawable(new BitmapDrawable()); mPopGridRadioGroup.setTouchInterceptor(new OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_OUTSIDE) { mPopGridRadioGroup.dismiss(); return true; } return false; } }); } mPopGridRadioGroup.showAtLocation(findViewById(R.id.mainView), Gravity.CENTER, 0, 0); mPopGridRadioGroup.update(); } /* * 创建包含多个radiobutton的Adapter。 * RadioButton的图片有redioImg指定,RadioButton的文字由radioNameArray指定 * RadioButton的图片和文字的相对位置在item_radiobutton.xml布局文件中指定。 */ private SimpleAdapter getRadioButtonAdapter(int redioImage, String[] radioNameArray) { ArrayList<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>(); for (int i = 0; i < radioNameArray.length; i++) { HashMap<String, Object> map = new HashMap<String, Object>(); map.put("itemRadioImg", redioImage); map.put("itemRadioText", radioNameArray[i]); data.add(map); } SimpleAdapter simperAdapter = new SimpleAdapter(this, data, R.layout.item_radiobutton, new String[] { "itemRadioImg", "itemRadioText" }, new int[] { R.id.item_radioimg, R.id.item_radiotext }); return simperAdapter; } /* * 根据选中的状态来更新图标。也就是实现我们自定义RadioGroup的单选功能 */ private void ChangeRadioImg(SimpleAdapter adapter,int selectedItem, boolean on) { HashMap<String, Object> map = (HashMap<String, Object>)adapter.getItem(selectedItem); if(on) map.put("itemRadioImg", R.drawable.btn_radio_on); else map.put("itemRadioImg", R.drawable.btn_radio_off); adapter.notifyDataSetChanged(); } }
布局文件除开第一步(创建由Img和Text组合而成的、外形类似于RadioButton的组合View视图)已经贴出的item_radiobutton.xml,还有:
main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/mainView" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/btn_pop" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal" android:textSize="20sp" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:text="@string/popRadioGroup" /> </LinearLayout>
radiogroup_gridview.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:gravity="center" android:layout_height="fill_parent" android:layout_gravity="center" android:background="#b5555555" > <TextView android:id="@+id/rdaiogroup_title" android:layout_width="fill_parent" android:textSize="20sp" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="@string/your_wish_most" /> <LinearLayout android:orientation="vertical" android:layout_width="wrap_content" android:gravity="center" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/grid_corner"> <GridView android:id="@+id/gridview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:numColumns="2" android:verticalSpacing="5dip" android:horizontalSpacing="5dip" android:stretchMode="columnWidth" android:gravity="center" android:layout_gravity="center" /> </LinearLayout> <Button android:id="@+id/bt_confirm" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_horizontal" android:textSize="20sp" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:text="@string/confirm" /> </LinearLayout>
grid_corner.xml:
<?xml version="1.0" encoding="UTF-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient android:startColor="#c0000000" android:endColor="#c0000000" android:angle="90" /> <stroke android:dashWidth="5dp" android:dashGap="1dp" android:width="1dp" android:color="#FF999999"></stroke> <!-- 描边 --> <corners android:bottomRightRadius="5dp" android:bottomLeftRadius="5dp" android:topLeftRadius="5dp" android:topRightRadius="5dp" /><!--设置圆角 --> </shape>
如果本文能对你有所帮助,我会更开心.
源码的下载地址:http://download.youkuaiyun.com/source/3320256
(源自:http://www.cnblogs.com/hibraincol/archive/2011/05/28/2060691.html)