Android网格布局(GridView)---实现漂亮的多选效果

接上文

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

Android网格布局(GridView)---实现漂亮的多选效果

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:

http://download.csdn.net/detail/kiritor/5144666

秒客网

Android网格布局(GridView)---实现漂亮的多选效果

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