[Android] 通过GridView仿微信动态添加本地图片

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原文：http://blog.csdn.net/eastmount/article/details/41808179

前面文章讲述的都是"随手拍"中图像处理的操作,此篇文章主要讲述GridView控件实现添加本地图片并显示.主要是关于GridView控件的基本操作,通常可以通过自定义继承BaseAdapter的适配器加载图片,而下面讲述的不是自定义的适配器,而是调用SimpleAdapter实现的.至于上传发布与网络交互此处不讲述,后面文章会讲!

一. 实现效果

   

二. 项目工程结构

三. 界面布局详细代码

    1.主界面activity_main.xml
    主要通过相对布局实现,第一部分是底部的TextView,中间是EditView和GridView相对布局,下面是两个按钮.同时EditView调用res/drawable-hdpi中的editview_shape.xml,GridView显示的每张图片通过griditem_addpic.xml实现.

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1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:id="@+id/container"  
4.     android:layout_width="match_parent"  
5.     android:layout_height="match_parent"  
6.     tools:context="com.example.suishoupaipublish.MainActivity"  
7.     tools:ignore="MergeRootFrame" >  
8.       
9.     <!-- 顶部添加文字 -->   
10.     <RelativeLayout    
11.         android:id="@+id/Layout_top"    
12.         android:orientation="horizontal"     
13.         android:layout_width="fill_parent"    
14.         android:layout_height="40dp"    
15.         android:layout_marginTop="5dp"  
16.         android:layout_alignParentTop="true"    
17.         android:gravity="center">    
18.         <TextView    
19.             android:layout_width="fill_parent"     
20.             android:layout_height="wrap_content"      
21.             android:textSize="25sp"  
22.             android:gravity="center"  
23.             android:text="发布信息" />   
24.     </RelativeLayout>    
25.     <!-- 底部按钮 -->    
26.     <RelativeLayout    
27.         android:id="@+id/Layout_bottom"     
28.         android:layout_alignParentBottom="true"  
29.         android:layout_width="fill_parent"     
30.         android:layout_height="50dp"  
31.         android:gravity="center" >    
32.         <Button    
33.             android:id="@+id/button1"    
34.             android:layout_width="wrap_content"    
35.             android:layout_height="fill_parent"  
36.             android:textSize="20sp"  
37.             android:text="发布拍拍" />    
38.         <Button    
39.             android:id="@+id/button2"    
40.             android:layout_width="wrap_content"    
41.             android:layout_height="fill_parent"  
42.             android:layout_toRightOf="@+id/button1"  
43.             android:textSize="20sp"  
44.             android:text="取消发布" />  
45.     </RelativeLayout>    
46.     <!-- 显示图片 -->    
47.     <RelativeLayout    
48.         android:id="@+id/Content_Layout"       
49.         android:layout_width="fill_parent"     
50.         android:layout_height="fill_parent"    
51.         android:layout_above="@id/Layout_bottom"     
52.         android:layout_below="@id/Layout_top"      
53.         android:gravity="center">       
54.         <LinearLayout     
55.             android:layout_width="match_parent"    
56.             android:layout_height="match_parent"    
57.             android:orientation="vertical"  
58.             android:layout_alignParentBottom="true" >   
59.             <!-- 设置运行多行 设置圆角图形 黑色字体-->  
60.             <EditText   
61.                 android:id="@+id/editText1"  
62.                 android:layout_height="120dp"  
63.                 android:layout_width="fill_parent"  
64.                 android:textColor="#000000"  
65.                 android:layout_margin="12dp"  
66.                 android:textSize="20sp"  
67.                 android:hint="随手说出你此刻的心声..."  
68.                 android:maxLength="500"  
69.                 android:singleLine="false"  
70.                 android:background="@drawable/editview_shape" />  
71.             <!-- 网格显示图片 行列间距5dp 每列宽度90dp -->  
72.             <GridView  
73.                 android:id="@+id/gridView1"  
74.                 android:layout_width="fill_parent"  
75.                 android:layout_height="200dp"  
76.                 android:layout_margin="10dp"  
77.                 android:background="#EFDFDF"  
78.                 android:horizontalSpacing="5dp"  
79.                 android:verticalSpacing="5dp"  
80.                 android:numColumns="4"  
81.                 android:columnWidth="90dp"  
82.                 android:stretchMode="columnWidth"  
83.                 android:gravity="center" >  
84.             </GridView>  
85.             <TextView   
86.                 android:layout_width="fill_parent"  
87.                 android:layout_height="wrap_content"  
88.                 android:text="(友情提示:只能添加9张图片,长按图片可以删除已添加图片)"  
89.                 android:gravity="center" />  
90.         </LinearLayout>  
91.     </RelativeLayout>  
92.       
93. </RelativeLayout>  

    2.显示ImageView图片布局griditem_addpic.xml

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     android:gravity="center"  
6.     android:descendantFocusability="blocksDescendants"  
7.     android:orientation="vertical" >  
8.     <RelativeLayout  
9.         android:layout_gravity="center"  
10.         android:layout_width="80dp"  
11.         android:layout_height="80dp"  
12.         android:orientation="vertical" >  
13.         <ImageView  
14.             android:layout_marginTop="10dp"  
15.             android:layout_marginRight="10dp"  
16.             android:id="@+id/imageView1"  
17.             android:layout_width="fill_parent"  
18.             android:layout_height="fill_parent"  
19.             android:scaleType="fitXY"  
20.             android:src="@drawable/gridview_addpic" />  
21.     </RelativeLayout>  
22. </LinearLayout>  

    3.设置EditView控件圆角和颜色 editview_shape.xml

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <shape xmlns:android="http://schemas.android.com/apk/res/android"   
3.     android:shape="rectangle"   
4.     android:padding="10dp">  
5.     <!-- 填充editView的颜色 -->  
6.     <soild android:color="#ffffff"/>  
7.     <!-- 设置圆角的弧度，radius半径越大，editView的边角越圆 -->  
8.     <corners   
9.         android:radius="15dp"  
10.         android:bottomRightRadius="15dp"  
11.         android:bottomLeftRadius="15dp"  
12.         android:topLeftRadius="15dp"    
13.         android:topRightRadius="15dp"/>  
14.     <stroke  
15.         android:color="#32CD32"    
16.         android:width="4px" />   
17. </shape>  

四. 代码详解

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1. public class MainActivity extends Activity {  
2.   
3.     private GridView gridView1;              //网格显示缩略图  
4.     private Button buttonPublish;            //发布按钮  
5.     private final int IMAGE_OPEN = 1;        //打开图片标记  
6.     private String pathImage;                //选择图片路径  
7.     private Bitmap bmp;                      //导入临时图片  
8.     private ArrayList<HashMap<String, Object>> imageItem;  
9.     private SimpleAdapter simpleAdapter;     //适配器  
10.       
11.     @Override  
12.     protected void onCreate(Bundle savedInstanceState) {  
13.         super.onCreate(savedInstanceState);  
14.         setContentView(R.layout.activity_main);  
15.         /* 
16.          * 防止键盘挡住输入框 
17.          * 不希望遮挡设置activity属性 android:windowSoftInputMode="adjustPan" 
18.          * 希望动态调整高度 android:windowSoftInputMode="adjustResize" 
19.          */  
20.         getWindow().setSoftInputMode(WindowManager.LayoutParams.  
21.                 SOFT_INPUT_ADJUST_PAN);  
22.         //锁定屏幕  
23.         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);  
24.         setContentView(R.layout.activity_main);  
25.         //获取控件对象  
26.         gridView1 = (GridView) findViewById(R.id.gridView1);  
27.   
28.         /* 
29.          * 载入默认图片添加图片加号 
30.          * 通过适配器实现 
31.          * SimpleAdapter参数imageItem为数据源 R.layout.griditem_addpic为布局 
32.          */  
33.         //获取资源图片加号  
34.         bmp = BitmapFactory.decodeResource(getResources(), R.drawable.gridview_addpic);  
35.         imageItem = new ArrayList<HashMap<String, Object>>();  
36.         HashMap<String, Object> map = new HashMap<String, Object>();  
37.         map.put("itemImage", bmp);  
38.         imageItem.add(map);  
39.         simpleAdapter = new SimpleAdapter(this,   
40.                 imageItem, R.layout.griditem_addpic,   
41.                 new String[] { "itemImage"}, new int[] { R.id.imageView1});   
42.         /* 
43.          * HashMap载入bmp图片在GridView中不显示,但是如果载入资源ID能显示 如 
44.          * map.put("itemImage", R.drawable.img); 
45.          * 解决方法: 
46.          *              1.自定义继承BaseAdapter实现 
47.          *              2.ViewBinder()接口实现 
48.          *  参考 http://blog.csdn.net/admin_/article/details/7257901 
49.          */  
50.         simpleAdapter.setViewBinder(new ViewBinder() {    
51.             @Override    
52.             public boolean setViewValue(View view, Object data,    
53.                     String textRepresentation) {    
54.                 // TODO Auto-generated method stub    
55.                 if(view instanceof ImageView && data instanceof Bitmap){    
56.                     ImageView i = (ImageView)view;    
57.                     i.setImageBitmap((Bitmap) data);    
58.                     return true;    
59.                 }    
60.                 return false;    
61.             }  
62.         });    
63.         gridView1.setAdapter(simpleAdapter);  
64.           
65.         /* 
66.          * 监听GridView点击事件 
67.          * 报错:该函数必须抽象方法 故需要手动导入import android.view.View; 
68.          */  
69.         gridView1.setOnItemClickListener(new OnItemClickListener() {  
70.             @Override  
71.             public void onItemClick(AdapterView<?> parent, View v, int position, long id)  
72.             {  
73.                 if( imageItem.size() == 10) { //第一张为默认图片  
74.                     Toast.makeText(MainActivity.this, "图片数9张已满", Toast.LENGTH_SHORT).show();  
75.                 }  
76.                 else if(position == 0) { //点击图片位置为+ 0对应0张图片  
77.                     Toast.makeText(MainActivity.this, "添加图片", Toast.LENGTH_SHORT).show();  
78.                     //选择图片  
79.                     Intent intent = new Intent(Intent.ACTION_PICK,         
80.                             android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);    
81.                     startActivityForResult(intent, IMAGE_OPEN);    
82.                     //通过onResume()刷新数据  
83.                 }  
84.                 else {  
85.                     dialog(position);  
86.                     //Toast.makeText(MainActivity.this, "点击第"+(position + 1)+" 号图片",   
87.                     //      Toast.LENGTH_SHORT).show();  
88.                 }  
89.             }  
90.         });    
91.     }  
92.       
93.     //获取图片路径 响应startActivityForResult    
94.     protected void onActivityResult(int requestCode, int resultCode, Intent data) {    
95.         super.onActivityResult(requestCode, resultCode, data);          
96.         //打开图片    
97.         if(resultCode==RESULT_OK && requestCode==IMAGE_OPEN) {          
98.             Uri uri = data.getData();    
99.             if (!TextUtils.isEmpty(uri.getAuthority())) {    
100.                 //查询选择图片    
101.                 Cursor cursor = getContentResolver().query(    
102.                         uri,    
103.                         new String[] { MediaStore.Images.Media.DATA },    
104.                         null,     
105.                         null,     
106.                         null);    
107.                 //返回 没找到选择图片    
108.                 if (null == cursor) {    
109.                     return;    
110.                 }    
111.                 //光标移动至开头 获取图片路径    
112.                 cursor.moveToFirst();    
113.                 pathImage = cursor.getString(cursor    
114.                         .getColumnIndex(MediaStore.Images.Media.DATA));    
115.             }  
116.         }  //end if 打开图片  
117.     }  
118.       
119.     //刷新图片  
120.     @Override  
121.     protected void onResume() {  
122.         super.onResume();  
123.         if(!TextUtils.isEmpty(pathImage)){  
124.             Bitmap addbmp=BitmapFactory.decodeFile(pathImage);  
125.             HashMap<String, Object> map = new HashMap<String, Object>();  
126.             map.put("itemImage", addbmp);  
127.             imageItem.add(map);  
128.             simpleAdapter = new SimpleAdapter(this,   
129.                     imageItem, R.layout.griditem_addpic,   
130.                     new String[] { "itemImage"}, new int[] { R.id.imageView1});   
131.             simpleAdapter.setViewBinder(new ViewBinder() {    
132.                 @Override    
133.                 public boolean setViewValue(View view, Object data,    
134.                         String textRepresentation) {    
135.                     // TODO Auto-generated method stub    
136.                     if(view instanceof ImageView && data instanceof Bitmap){    
137.                         ImageView i = (ImageView)view;    
138.                         i.setImageBitmap((Bitmap) data);    
139.                         return true;    
140.                     }    
141.                     return false;    
142.                 }  
143.             });   
144.             gridView1.setAdapter(simpleAdapter);  
145.             simpleAdapter.notifyDataSetChanged();  
146.             //刷新后释放防止手机休眠后自动添加  
147.             pathImage = null;  
148.         }  
149.     }  
150.       
151.     /* 
152.      * Dialog对话框提示用户删除操作 
153.      * position为删除图片位置 
154.      */  
155.     protected void dialog(final int position) {  
156.         AlertDialog.Builder builder = new Builder(MainActivity.this);  
157.         builder.setMessage("确认移除已添加图片吗？");  
158.         builder.setTitle("提示");  
159.         builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {  
160.             @Override  
161.             public void onClick(DialogInterface dialog, int which) {  
162.                 dialog.dismiss();  
163.                 imageItem.remove(position);  
164.                 simpleAdapter.notifyDataSetChanged();  
165.             }  
166.         });  
167.         builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  
168.             @Override  
169.             public void onClick(DialogInterface dialog, int which) {  
170.                 dialog.dismiss();  
171.                 }  
172.             });  
173.         builder.create().show();  
174.     }  
175.   
176. }  

    同时需要在AndroidMainfest.xml中添加权限操作SD卡和网络上传至服务器.

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1. <!-- 申明网络权限  -->  
2. <uses-permission android:name="android.permission.INTERNET" />  
3. <!-- 申明权限 操作SD卡 -->    
4. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />  

五. 总结

    

    该文章需要注意一个地方：在使用SimpleAdapter适配器加载bmp图片时,可能在GridView中不显示.即HashMap中map.put("itemImage",bmp)不显示图片,而使用put装入R.drawable.img却能显示.
    这时有两种解决方法,一种是自定义继承BaseAdapter的适配器实现;另一种方法则是如上所示通过ViewBinder()接口实现,感谢博主dmin_提供的方法.
    下载地址:http://download.csdn.net/detail/eastmount/8237429
    最后希望文章对大家有所帮助,如果有错误或不足之处,请海涵~最近学校网比较差,回复别人都不行.
    (By:Eastmount 2014-12-8 晚9点 http://blog.csdn.net/eastmount/)

[Android] 通过GridView仿微信动态添加本地图片

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原文地址：http://www.cnblogs.com/tc310/p/4972180.html