Android网格布局GridView实现漂亮的多选效果

上一篇文章中主要讲了GridView的简单应用，以网格的形式展示了一些图片，对于图片也有点击监听操作。但是，如果我们在浏览图片的时候需要一些选中操作、甚至是多选操作的时候。这样的功能我们又该如何实现呢？

可以使用ActionBar +GridView的形式实现！在谈及具体实现之前，首先我们先了解一下什么是

ActionBar：

 Action Bar是活动中的一种控件，用以代替传统的品目顶端的标题栏，它提供了多便利性。有关其详细内容会在以后研究，现在主要考虑上述需求的实现。

先上效果图

首先是关于ActionBar的布局文件：主要是用于实现全选与全不选的功能的。

<?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> 

其次是其样式文件：

<?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> 

字符资源文件：

<?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> 

grid_item.xml文件

<?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> 

main.xml

<?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> 

actionBar_layout.xml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" > 
 
 <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> 

GridItem.java文件：

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 
 } 
 } 
 
} 

主activity文件：

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; 
 } 
 } 
 
} 

完整源码：多选效果

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