Android网格布局GridView实现漂亮的多选效果

<?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android" >   <item  android:id="@+id/menu_select"  android:title="@string/select_all"/>  <item  android:id="@+id/menu_unselect"  android:title="@string/unselect_all"/>  </menu> 

<?xml version="1.0" encoding="utf-8"?> <resources>   <!-- 设置ActionBar的样式 -->  <style name="DiyTheme" parent="@android:style/Theme.Holo">  <item name="android:actionModeBackground">@drawable/tab_bg</item>  <item name="android:actionModeCloseDrawable">@drawable/back</item>  <item name="android:actionBarStyle">@style/DiyActionBarStyle</item>  </style>   <style name="DiyActionBarStyle" parent="@android:style/Widget.Holo.ActionBar">  <item name="android:background">@drawable/tab_bg</item>  </style>  </resources> 

<?xml version="1.0" encoding="utf-8"?> <resources>   <string name="app_name">GridView</string>  <string name="selection">选中%s个</string>  <string name="select_all">全选</string>  <string name="unselect_all">全不选</string>  </resources> 

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent" >   <ImageView  android:id="@+id/img_view"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:scaleType="fitXY" />   <ImageView  android:id="@+id/select"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignParentRight="true"  android:layout_alignParentTop="true"  android:background="@drawable/icon_choice"  android:visibility="gone" />  <!-- 这里是当该图片被选上的时候打上小勾的,因此起初是隐藏不显示的 --> </RelativeLayout> 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent" >   <GridView  android:id="@+id/gridview"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:columnWidth="75dip"  android:gravity="center"  android:horizontalSpacing="2dip"  android:numColumns="4"  android:verticalSpacing="2dip"  android:layout_marginTop="20dip" />  </LinearLayout> 

<?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" >   <TextView  android:id="@+id/action_text"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:textSize="18sp"  android:textColor="@android:color/white"  android:layout_gravity="center_vertical" />  </LinearLayout> 

package com.kiritor; /**  * @author Kiritor  * 实现自己的View继承Checable接口*/ import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.widget.Checkable; import android.widget.ImageView; import android.widget.RelativeLayout;  public class GridItem extends RelativeLayout implements Checkable {   private Context mContext;  private boolean mChecked;//判断该选项是否被选上的标志量  private ImageView mImgView = null;  private ImageView mSecletView = null;   public GridItem(Context context) {  this(context, null, 0);  }   public GridItem(Context context, AttributeSet attrs) {  this(context, attrs, 0);  }   public GridItem(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle);  // TODO Auto-generated constructor stub  mContext = context;  LayoutInflater.from(mContext).inflate(R.layout.grid_item, this);  mImgView = (ImageView) findViewById(R.id.img_view);  mSecletView = (ImageView) findViewById(R.id.select);  }   @Override  public void setChecked(boolean checked) {  // TODO Auto-generated method stub  mChecked = checked;  setBackgroundDrawable(checked ? getResources().getDrawable(   R.drawable.background) : null);  mSecletView.setVisibility(checked ? View.VISIBLE : View.GONE);//选上了则显示小勾图片  }   @Override  public boolean isChecked() {  // TODO Auto-generated method stub  return mChecked;  }   @Override  public void toggle() {  setChecked(!mChecked);  }   public void setImgResId(int resId) {  if (mImgView != null) {   mImgView.setBackgroundResource(resId);//设置背景  }  }  } 

package com.kiritor;  import java.util.HashMap; import java.util.Map; import java.util.Set; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.ActionMode; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView.LayoutParams; import android.widget.AbsListView.MultiChoiceModeListener; import android.widget.BaseAdapter; import android.widget.Checkable; import android.widget.FrameLayout; import android.widget.GridView; import android.widget.ImageView; import android.widget.ListAdapter; import android.widget.TextView;  public class HomeActivity extends Activity implements MultiChoiceModeListener {   private GridView mGridView;  private GridAdapter mGridAdapter;  private TextView mActionText;  private static final int MENU_SELECT_ALL = 0;  private static final int MENU_UNSELECT_ALL = MENU_SELECT_ALL + 1;  private Map<Integer, Boolean> mSelectMap = new HashMap<Integer, Boolean>();   private int[] mImgIds = new int[] { R.drawable.img_1, R.drawable.img_2,   R.drawable.img_3, R.drawable.img_4, R.drawable.img_5,   R.drawable.img_6, R.drawable.img_7, R.drawable.img_8,   R.drawable.img_9, R.drawable.img_1, R.drawable.img_2,   R.drawable.img_3, R.drawable.img_4, R.drawable.img_5,   R.drawable.img_6, R.drawable.img_7, R.drawable.img_3,   R.drawable.img_4, R.drawable.img_5, R.drawable.img_5 };   /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.main);  mGridView = (GridView) findViewById(R.id.gridview);  mGridView.setChoiceMode(GridView.CHOICE_MODE_MULTIPLE_MODAL);// 设置为多选模式  mGridAdapter = new GridAdapter(this);  mGridView.setAdapter(mGridAdapter);// 数据适配  mGridView.setMultiChoiceModeListener(this);// 设置多选模式监听器  }   /** Override MultiChoiceModeListener start **/  @Override  public boolean onCreateActionMode(ActionMode mode, Menu menu) {  // TODO Auto-generated method stub  // 得到布局文件的View  View v = LayoutInflater.from(this).inflate(R.layout.actionbar_layout,   null);  mActionText = (TextView) v.findViewById(R.id.action_text);  // 设置显示内容为GridView选中的项目个数  mActionText.setText(formatString(mGridView.getCheckedItemCount()));  // 设置动作条的视图  mode.setCustomView(v);  // 得到菜单  getMenuInflater().inflate(R.menu.action_menu, menu);  return true;  }   @Override  public boolean onPrepareActionMode(ActionMode mode, Menu menu) {  // TODO Auto-generated method stub  /* 初始状态下,如果选中的项数不等于总共的项数,设置"全选"的状态为True */  menu.getItem(MENU_SELECT_ALL).setEnabled(   mGridView.getCheckedItemCount() != mGridView.getCount());  return true;  }   @Override  public boolean onActionItemClicked(ActionMode mode, MenuItem item) {  // TODO Auto-generated method stub  /*   * 当点击全选的时候,全选 点击全不选的时候全不选   */  switch (item.getItemId()) {  case R.id.menu_select:   for (int i = 0; i < mGridView.getCount(); i++) {   mGridView.setItemChecked(i, true);   mSelectMap.put(i, true);   }   break;  case R.id.menu_unselect:   for (int i = 0; i < mGridView.getCount(); i++) {   mGridView.setItemChecked(i, false);   mSelectMap.clear();   }   break;  }  return true;  }   @Override  public void onDestroyActionMode(ActionMode mode) {  // TODO Auto-generated method stub  mGridAdapter.notifyDataSetChanged();  }   @Override  public void onItemCheckedStateChanged(ActionMode mode, int position,   long id, boolean checked) {  // TODO Auto-generated method stub  // 当每个项状态改变的时候的操作  mActionText.setText(formatString(mGridView.getCheckedItemCount()));  mSelectMap.put(position, checked);/* 放入选中的集合中 */  mode.invalidate();  }   /** Override MultiChoiceModeListener end **/   private String formatString(int count) {  return String.format(getString(R.string.selection), count);  }   private class GridAdapter extends BaseAdapter {   private Context mContext;   public GridAdapter(Context ctx) {   mContext = ctx;  }   @Override  public int getCount() {   // TODO Auto-generated method stub   return mImgIds.length;  }   @Override  public Integer getItem(int position) {   // TODO Auto-generated method stub   return Integer.valueOf(mImgIds[position]);  }   @Override  public long getItemId(int position) {   // TODO Auto-generated method stub   return position;  }   @SuppressWarnings("deprecation")  @Override  /* 得到View */  public View getView(int position, View convertView, ViewGroup parent) {   GridItem item;   if (convertView == null) {   item = new GridItem(mContext);   item.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,    LayoutParams.FILL_PARENT));   } else {   item = (GridItem) convertView;   }   item.setImgResId(getItem(position));   item.setChecked(mSelectMap.get(position) == null ? false    : mSelectMap.get(position));   return item;  }  }  }