FormFile.java:
package com.example.photowallfallsdemo;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
/**
* 上传文件
*/
public class FormFile {
/* 上传文件的数据 */
private byte[] data;
private InputStream inStream;
private File file;
/* 文件名称 */
private String filname;
/* 请求参数名称*/
private String parameterName;
/* 内容类型 */
private String contentType = "application/octet-stream";
/**
* 此函数用来传输小文件
* @param filname
* @param data
* @param parameterName
* @param contentType
*/
public FormFile(String filname, byte[] data, String parameterName, String contentType) {
this.data = data;
this.filname = filname;
this.parameterName = parameterName;
if(contentType!=null) this.contentType = contentType;
}
/**
* 此函数用来传输大文件
* @param filname
* @param file
* @param parameterName
* @param contentType
*/
public FormFile(String filname, File file, String parameterName, String contentType) {
this.filname = filname;
this.parameterName = parameterName;
this.file = file;
try {
this.inStream = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
if(contentType!=null) this.contentType = contentType;
}
public File getFile() {
return file;
}
public InputStream getInStream() {
return inStream;
}
public byte[] getData() {
return data;
}
public String getFilname() {
return filname;
}
public void setFilname(String filname) {
this.filname = filname;
}
public String getParameterName() {
return parameterName;
}
public void setParameterName(String parameterName) {
this.parameterName = parameterName;
}
public String getContentType() {
return contentType;
}
public void setContentType(String contentType) {
this.contentType = contentType;
}
}
HttpRequestUtil.java:
package com.example.photowallfallsdemo;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
/*
* 此类用来发送HTTP请求
* */
public class HttpRequestUtil {
/**
* 发送GET请求
* @param url
* @param params
* @param headers
* @return
* @throws Exception
*/
public static URLConnection sendGetRequest(String url,
Map<String, String> params, Map<String, String> headers)
throws Exception {
StringBuilder buf = new StringBuilder(url);
Set<Entry<String, String>> entrys = null;
// 如果是GET请求，则请求参数在URL中
if (params != null && !params.isEmpty()) {
buf.append("?");
entrys = params.entrySet();
for (Map.Entry<String, String> entry : entrys) {
buf.append(entry.getKey()).append("=")
.append(URLEncoder.encode(entry.getValue(), "UTF-8"))
.append("&");
}
buf.deleteCharAt(buf.length() - 1);
}
URL url1 = new URL(buf.toString());
HttpURLConnection conn = (HttpURLConnection) url1.openConnection();
conn.setRequestMethod("GET");
// 设置请求头
if (headers != null && !headers.isEmpty()) {
entrys = headers.entrySet();
for (Map.Entry<String, String> entry : entrys) {
conn.setRequestProperty(entry.getKey(), entry.getValue());
}
}
conn.getResponseCode();
return conn;
}
/**
* 发送POST请求
* @param url
* @param params
* @param headers
* @return
* @throws Exception
*/
public static URLConnection sendPostRequest(String url,
Map<String, String> params, Map<String, String> headers)
throws Exception {
StringBuilder buf = new StringBuilder();
Set<Entry<String, String>> entrys = null;
// 如果存在参数，则放在HTTP请求体，形如name=aaa&age=10
if (params != null && !params.isEmpty()) {
entrys = params.entrySet();
for (Map.Entry<String, String> entry : entrys) {
buf.append(entry.getKey()).append("=")
.append(URLEncoder.encode(entry.getValue(), "UTF-8"))
.append("&");
}
buf.deleteCharAt(buf.length() - 1);
}
URL url1 = new URL(url);
HttpURLConnection conn = (HttpURLConnection) url1.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
OutputStream out = conn.getOutputStream();
out.write(buf.toString().getBytes("UTF-8"));
if (headers != null && !headers.isEmpty()) {
entrys = headers.entrySet();
for (Map.Entry<String, String> entry : entrys) {
conn.setRequestProperty(entry.getKey(), entry.getValue());
}
}
conn.getResponseCode(); // 为了发送成功
return conn;
}
/**
* 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:
* <FORM METHOD=POST ACTION="http://192.168.0.200:8080/ssi/fileload/test.do" enctype="multipart/form-data">
<INPUT TYPE="text" NAME="name">
<INPUT TYPE="text" NAME="id">
<input type="file" name="imagefile"/>
<input type="file" name="zip"/>
</FORM>
* @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)
* @param params 请求参数 key为参数名,value为参数值
* @param file 上传文件
*/
public static boolean uploadFiles(String path, Map<String, String> params, FormFile[] files) throws Exception{
final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线
final String endline = "--" + BOUNDARY + "--\r\n";//数据结束标志
int fileDataLength = 0;
if(files!=null&&files.length!=0){
for(FormFile uploadFile : files){//得到文件类型数据的总长度
StringBuilder fileExplain = new StringBuilder();
fileExplain.append("--");
fileExplain.append(BOUNDARY);
fileExplain.append("\r\n");
fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
fileExplain.append("\r\n");
fileDataLength += fileExplain.length();
if(uploadFile.getInStream()!=null){
fileDataLength += uploadFile.getFile().length();
}else{
fileDataLength += uploadFile.getData().length;
}
}
}
StringBuilder textEntity = new StringBuilder();
if(params!=null&&!params.isEmpty()){
for (Map.Entry<String, String> entry : params.entrySet()) {//构造文本类型参数的实体数据
textEntity.append("--");
textEntity.append(BOUNDARY);
textEntity.append("\r\n");
textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");
textEntity.append(entry.getValue());
textEntity.append("\r\n");
}
}
//计算传输给服务器的实体数据总长度
int dataLength = textEntity.toString().getBytes().length + fileDataLength + endline.getBytes().length;
URL url = new URL(path);
int port = url.getPort()==-1 ? 80 : url.getPort();
Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);
OutputStream outStream = socket.getOutputStream();
//下面完成HTTP请求头的发送
String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n";
outStream.write(requestmethod.getBytes());
String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";
outStream.write(accept.getBytes());
String language = "Accept-Language: zh-CN\r\n";
outStream.write(language.getBytes());
String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n";
outStream.write(contenttype.getBytes());
String contentlength = "Content-Length: "+ dataLength + "\r\n";
outStream.write(contentlength.getBytes());
String alive = "Connection: Keep-Alive\r\n";
outStream.write(alive.getBytes());
String host = "Host: "+ url.getHost() +":"+ port +"\r\n";
outStream.write(host.getBytes());
//写完HTTP请求头后根据HTTP协议再写一个回车换行
outStream.write("\r\n".getBytes());
//把所有文本类型的实体数据发送出来
outStream.write(textEntity.toString().getBytes());
//把所有文件类型的实体数据发送出来
if(files!=null&&files.length!=0){
for(FormFile uploadFile : files){
StringBuilder fileEntity = new StringBuilder();
fileEntity.append("--");
fileEntity.append(BOUNDARY);
fileEntity.append("\r\n");
fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
outStream.write(fileEntity.toString().getBytes());
if(uploadFile.getInStream()!=null){
byte[] buffer = new byte[1024];
int len = 0;
while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){
outStream.write(buffer, 0, len);
}
uploadFile.getInStream().close();
}else{
outStream.write(uploadFile.getData(), 0, uploadFile.getData().length);
}
outStream.write("\r\n".getBytes());
}
}
//下面发送数据结束标志，表示数据已经结束
outStream.write(endline.getBytes());
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
if(reader.readLine().indexOf("200")==-1){//读取web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败
return false;
}
outStream.flush();
outStream.close();
reader.close();
socket.close();
return true;
}
/**
* 提交数据到服务器
* @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)
* @param params 请求参数 key为参数名,value为参数值
* @param file 上传文件
*/
public static boolean uploadFile(String path, Map<String, String> params, FormFile file) throws Exception{
return uploadFiles(path, params, new FormFile[]{file});
}
/**
* 将输入流转为字节数组
* @param inStream
* @return
* @throws Exception
*/
public static byte[] read2Byte(InputStream inStream)throws Exception{
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) !=-1 ){
outSteam.write(buffer, 0, len);
}
outSteam.close();
inStream.close();
return outSteam.toByteArray();
}
/**
* 将输入流转为字符串
* @param inStream
* @return
* @throws Exception
*/
public static String read2String(InputStream inStream)throws Exception{
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) !=-1 ){
outSteam.write(buffer, 0, len);
}
outSteam.close();
inStream.close();
return new String(outSteam.toByteArray(),"UTF-8");
}
/**
* 发送xml数据
* @param path 请求地址
* @param xml xml数据
* @param encoding 编码
* @return
* @throws Exception
*/
public static byte[] postXml(String path, String xml, String encoding) throws Exception{
byte[] data = xml.getBytes(encoding);
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "text/xml; charset="+ encoding);
conn.setRequestProperty("Content-Length", String.valueOf(data.length));
conn.setConnectTimeout(5 * 1000);
OutputStream outStream = conn.getOutputStream();
outStream.write(data);
outStream.flush();
outStream.close();
if(conn.getResponseCode()==200){
return read2Byte(conn.getInputStream());
}
return null;
}
//测试函数
public static void main(String args[]) throws Exception {
Map<String, String> params = new HashMap<String, String>();
params.put("name", "xiazdong");
params.put("age", "10");
HttpURLConnection conn = (HttpURLConnection) HttpRequestUtil
.sendGetRequest(
"http://192.168.0.103:8080/Server/PrintServlet",
params, null);
int code = conn.getResponseCode();
InputStream in = conn.getInputStream();
byte[]data = read2Byte(in);
//FormFile formFile = new FormFile(file.getName(), file, "document", "text/plain");
//boolean isSuccess = HttpRequestUtil.uploadFile("http://192.168.0.103:8080/Server/FileServlet", null, formFile);
}
}
ImageLoader.java:
package com.example.photowallfallsdemo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.LruCache;
/**
* 对图片进行管理的工具类。
*
* @author Tony
*/
public class ImageLoader {
/**
* 图片缓存技术的核心类，用于缓存所有下载好的图片，在程序内存达到设定值时会将最少最近使用的图片移除掉。
*/
private static LruCache<String, Bitmap> mMemoryCache;
/**
* ImageLoader的实例。
*/
private static ImageLoader mImageLoader;
private ImageLoader() {
// 获取应用程序最大可用内存
int maxMemory = (int) Runtime.getRuntime().maxMemory();
int cacheSize = maxMemory / 8;
// 设置图片缓存大小为程序最大可用内存的1/8
mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {
@Override
protected int sizeOf(String key, Bitmap bitmap) {
return bitmap.getByteCount();
}
};
}
/**
* 获取ImageLoader的实例。
*
* @return ImageLoader的实例。
*/
public static ImageLoader getInstance() {
if (mImageLoader == null) {
mImageLoader = new ImageLoader();
}
return mImageLoader;
}
/**
* 将一张图片存储到LruCache中。
*
* @param key
* LruCache的键，这里传入图片的URL地址。
* @param bitmap
* LruCache的键，这里传入从网络上下载的Bitmap对象。
*/
public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
if (getBitmapFromMemoryCache(key) == null) {
mMemoryCache.put(key, bitmap);
}
}
/**
* 从LruCache中获取一张图片，如果不存在就返回null。
*
* @param key
* LruCache的键，这里传入图片的URL地址。
* @return 对应传入键的Bitmap对象，或者null。
*/
public Bitmap getBitmapFromMemoryCache(String key) {
return mMemoryCache.get(key);
}
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth) {
// 源图片的宽度
final int width = options.outWidth;
int inSampleSize = 1;
if (width > reqWidth) {
// 计算出实际宽度和目标宽度的比率
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = widthRatio;
}
return inSampleSize;
}
public static Bitmap decodeSampledBitmapFromResource(String pathName,
int reqWidth) {
// 第一次解析将inJustDecodeBounds设置为true，来获取图片大小
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(pathName, options);
// 调用上面定义的方法计算inSampleSize值
options.inSampleSize = calculateInSampleSize(options, reqWidth);
// 使用获取到的inSampleSize值再次解析图片
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(pathName, options);
}
}
MainActivity.java:
package com.example.photowallfallsdemo;
import android.os.Bundle;
import android.view.Window;
import android.app.Activity;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
}
}
MyScrollView.java:
package com.example.photowallfallsdemo;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
/**
* 自定义的ScrollView，在其中动态地对图片进行添加。
*
* @author guolin
*/
public class MyScrollView extends ScrollView implements OnTouchListener {
/**
* 每页要加载的图片数量
*/
public static final int PAGE_SIZE = 10;
/**
* 记录当前已加载到第几页
*/
private int page=1;
/**
* 每一列的宽度
*/
private int columnWidth;
/**
* 当前第一列的高度
*/
private int firstColumnHeight;
/**
* 当前第二列的高度
*/
private int secondColumnHeight;
/**
* 当前第三列的高度
*/
private int thirdColumnHeight;
/**
* 是否已加载过一次layout，这里onLayout中的初始化只需加载一次
*/
private boolean loadOnce;
/**
* 对图片进行管理的工具类
*/
private ImageLoader imageLoader;
/**
* 第一列的布局
*/
private LinearLayout firstColumn;
/**
* 第二列的布局
*/
private LinearLayout secondColumn;
/**
* 第三列的布局
*/
private LinearLayout thirdColumn;
/**
* 记录所有正在下载或等待下载的任务。
*/
private static Set<LoadImageTask> taskCollection;
/**
* MyScrollView下的直接子布局。
*/
private static View scrollLayout;
/**
* MyScrollView布局的高度。
*/
private static int scrollViewHeight;
/**
* 记录上垂直方向的滚动距离。
*/
private static int lastScrollY = -1;
/**
* 记录所有界面上的图片，用以可以随时控制对图片的释放。
*/
private List<ImageView> imageViewList = new ArrayList<ImageView>();
/**
* 在Handler中进行图片可见性检查的判断，以及加载更多图片的操作。
*/
private static Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
MyScrollView myScrollView = (MyScrollView) msg.obj;
int scrollY = myScrollView.getScrollY();
// 如果当前的滚动位置和上次相同，表示已停止滚动
if (scrollY == lastScrollY) {
// 当滚动的最底部，并且当前没有正在下载的任务时，开始加载下一页的图片
if (scrollViewHeight + scrollY >= scrollLayout.getHeight()
&& taskCollection.isEmpty()) {
myScrollView.doMySendTest();
}
myScrollView.checkVisibility();
} else {
lastScrollY = scrollY;
Message message = new Message();
message.obj = myScrollView;
// 5毫秒后再次对滚动位置进行判断
handler.sendMessageDelayed(message, 5);
}
};
};
private Handler handler2 = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == 0) {
String resultStr=(String) msg.obj;
loadMoreImages(resultStr);
}
};
};
/**
* MyScrollView的构造函数。
*
* @param context
* @param attrs
*/
public MyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
imageLoader = ImageLoader.getInstance();
taskCollection = new HashSet<LoadImageTask>();
setOnTouchListener(this);
}
/**
* 进行一些关键性的初始化操作，获取MyScrollView的高度，以及得到第一列的宽度值。并在这里开始加载第一页的图片。
*/
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
if (changed && !loadOnce) {
scrollViewHeight = getHeight();
scrollLayout = getChildAt(0);
firstColumn = (LinearLayout) findViewById(R.id.first_column);
secondColumn = (LinearLayout) findViewById(R.id.second_column);
thirdColumn = (LinearLayout) findViewById(R.id.third_column);
columnWidth = firstColumn.getWidth();
loadOnce = true;
doMySendTest();
}
}
/**
* 监听用户的触屏事件，如果用户手指离开屏幕则开始进行滚动检测。
*/
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
Message message = new Message();
message.obj = this;
handler.sendMessageDelayed(message, 5);
}
return false;
}
//获取数据信息
public String getMyDataInfo(){
String resultstr="";
String murl="http://192.168.1.100/search.do";
System.out.println("getMyDataInfo==="+"执行getMyDataInfo.....");
Map<String, String> params = new HashMap<String, String>();
params.put("cid", "1971558");
params.put("page", page+"");
HttpURLConnection conn;
try {
// conn = (HttpURLConnection) HttpRequestUtil
// .sendGetRequest(
// murl,
// params, null);
conn = (HttpURLConnection) HttpRequestUtil
.sendPostRequest(
murl,
params, null);
int code = conn.getResponseCode();
InputStream in = conn.getInputStream();
byte[]data = HttpRequestUtil.read2Byte(in);
resultstr = new String(data, "utf-8");
System.out.println("resultstr==="+resultstr);
} catch (Exception e) {
e.printStackTrace();
}
return resultstr;
}
//执行远程请求
public void doMySendTest(){
new Thread() {
@Override
public void run() {
// TODO Auto-generated method stub
super.run();
String temp=getMyDataInfo();
Message msg = new Message();
msg.what = 0;
msg.obj = temp;
handler2.sendMessage(msg);
}
}.start();
}
/**
* 开始加载下一页的图片，每张图片都会开启一个异步线程去下载。
*/
public void loadMoreImages(String jsonString) {
JSONObject demoJson;
JSONArray mprodcutsList = null;
int totalSize=0;
try {
demoJson = new JSONObject(jsonString);
totalSize =Integer.parseInt(demoJson.getString("totalSize"));
mprodcutsList = demoJson.getJSONArray("mprodcuts");
if (hasSDCard()) {
int startIndex = (page-1) * PAGE_SIZE;
//int endIndex = page * PAGE_SIZE + PAGE_SIZE;
if (startIndex < totalSize) {
Toast.makeText(getContext(), "正在加载...", Toast.LENGTH_SHORT)
.show();
for (int i = 0; i < mprodcutsList.length(); i++) {
LoadImageTask task = new LoadImageTask();
taskCollection.add(task);
task.execute(mprodcutsList.getJSONObject(i).getString("bigpicture"));
}
page++;
} else {
Toast.makeText(getContext(), "已没有更多图片", Toast.LENGTH_SHORT)
.show();
}
} else {
Toast.makeText(getContext(), "未发现SD卡", Toast.LENGTH_SHORT)
.show();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 遍历imageViewList中的每张图片，对图片的可见性进行检查，如果图片已经离开屏幕可见范围，则将图片替换成一张空图。
*/
public void checkVisibility() {
for (int i = 0; i < imageViewList.size(); i++) {
ImageView imageView = imageViewList.get(i);
int borderTop = (Integer) imageView.getTag(R.string.border_top);
int borderBottom = (Integer) imageView
.getTag(R.string.border_bottom);
if (borderBottom > getScrollY()
&& borderTop < getScrollY() + scrollViewHeight) {
String imageUrl = (String) imageView.getTag(R.string.image_url);
Bitmap bitmap = imageLoader.getBitmapFromMemoryCache(imageUrl);
if (bitmap != null) {
imageView.setImageBitmap(bitmap);
} else {
LoadImageTask task = new LoadImageTask(imageView);
task.execute(imageUrl);
}
} else {
imageView.setImageResource(R.drawable.empty_photo);
}
}
}
/**
* 判断手机是否有SD卡。
*
* @return 有SD卡返回true，没有返回false。
*/
private boolean hasSDCard() {
return Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState());
}
/**
* 异步下载图片的任务。
*
* @author guolin
*/
class LoadImageTask extends AsyncTask<String, Void, Bitmap> {
/**
* 图片的URL地址
*/
private String mImageUrl;
/**
* 可重复使用的ImageView
*/
private ImageView mImageView;
public LoadImageTask() {
}
/**
* 将可重复使用的ImageView传入
*
* @param imageView
*/
public LoadImageTask(ImageView imageView) {
mImageView = imageView;
}
@Override
protected Bitmap doInBackground(String... params) {
mImageUrl = params[0];
Bitmap imageBitmap = imageLoader
.getBitmapFromMemoryCache(mImageUrl);
if (imageBitmap == null) {
imageBitmap = loadImage(mImageUrl);
}
return imageBitmap;
}
@Override
protected void onPostExecute(Bitmap bitmap) {
if (bitmap != null) {
double ratio = bitmap.getWidth() / (columnWidth * 1.0);
int scaledHeight = (int) (bitmap.getHeight() / ratio);
addImage(bitmap, columnWidth, scaledHeight);
}
taskCollection.remove(this);
}
/**
* 根据传入的URL，对图片进行加载。如果这张图片已经存在于SD卡中，则直接从SD卡里读取，否则就从网络上下载。
*
* @param imageUrl
* 图片的URL地址
* @return 加载到内存的图片。
*/
private Bitmap loadImage(String imageUrl) {
File imageFile = new File(getImagePath(imageUrl));
if (!imageFile.exists()) {
downloadImage(imageUrl);
}
if (imageUrl != null) {
Bitmap bitmap = ImageLoader.decodeSampledBitmapFromResource(
imageFile.getPath(), columnWidth);
if (bitmap != null) {
imageLoader.addBitmapToMemoryCache(imageUrl, bitmap);
return bitmap;
}
}
return null;
}
/**
* 向ImageView中添加一张图片
*
* @param bitmap
* 待添加的图片
* @param imageWidth
* 图片的宽度
* @param imageHeight
* 图片的高度
*/
private void addImage(Bitmap bitmap, int imageWidth, int imageHeight) {
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
imageWidth, imageHeight);
if (mImageView != null) {
mImageView.setImageBitmap(bitmap);
} else {
ImageView imageView = new ImageView(getContext());
imageView.setLayoutParams(params);
imageView.setImageBitmap(bitmap);
imageView.setScaleType(ScaleType.FIT_XY);
imageView.setPadding(5, 5, 5, 5);
imageView.setTag(R.string.image_url, mImageUrl);
TextView textview=new TextView(getContext());
findColumnToAdd(imageView, imageHeight).addView(imageView);
imageViewList.add(imageView);
}
}
/**
* 找到此时应该添加图片的一列。原则就是对三列的高度进行判断，当前高度最小的一列就是应该添加的一列。
*
* @param imageView
* @param imageHeight
* @return 应该添加图片的一列
*/
private LinearLayout findColumnToAdd(ImageView imageView,
int imageHeight) {
if (firstColumnHeight <= secondColumnHeight) {
if (firstColumnHeight <= thirdColumnHeight) {
imageView.setTag(R.string.border_top, firstColumnHeight);
firstColumnHeight += imageHeight;
imageView.setTag(R.string.border_bottom, firstColumnHeight);
return firstColumn;
}
imageView.setTag(R.string.border_top, thirdColumnHeight);
thirdColumnHeight += imageHeight;
imageView.setTag(R.string.border_bottom, thirdColumnHeight);
return thirdColumn;
} else {
if (secondColumnHeight <= thirdColumnHeight) {
imageView.setTag(R.string.border_top, secondColumnHeight);
secondColumnHeight += imageHeight;
imageView
.setTag(R.string.border_bottom, secondColumnHeight);
return secondColumn;
}
imageView.setTag(R.string.border_top, thirdColumnHeight);
thirdColumnHeight += imageHeight;
imageView.setTag(R.string.border_bottom, thirdColumnHeight);
return thirdColumn;
}
}
/**
* 将图片下载到SD卡缓存起来。
*
* @param imageUrl
* 图片的URL地址。
*/
private void downloadImage(String imageUrl) {
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Log.d("TAG", "monted sdcard");
} else {
Log.d("TAG", "has no sdcard");
}
HttpURLConnection con = null;
FileOutputStream fos = null;
BufferedOutputStream bos = null;
BufferedInputStream bis = null;
File imageFile = null;
try {
URL url = new URL(imageUrl);
con = (HttpURLConnection) url.openConnection();
con.setConnectTimeout(5 * 1000);
con.setReadTimeout(15 * 1000);
con.setDoInput(true);
con.setDoOutput(true);
bis = new BufferedInputStream(con.getInputStream());
imageFile = new File(getImagePath(imageUrl));
fos = new FileOutputStream(imageFile);
bos = new BufferedOutputStream(fos);
byte[] b = new byte[1024];
int length;
while ((length = bis.read(b)) != -1) {
bos.write(b, 0, length);
bos.flush();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (bis != null) {
bis.close();
}
if (bos != null) {
bos.close();
}
if (con != null) {
con.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
}
}
if (imageFile != null) {
Bitmap bitmap = ImageLoader.decodeSampledBitmapFromResource(
imageFile.getPath(), columnWidth);
if (bitmap != null) {
imageLoader.addBitmapToMemoryCache(imageUrl, bitmap);
}
}
}
/**
* 获取图片的本地存储路径。
*
* @param imageUrl
* 图片的URL地址。
* @return 图片的本地存储路径。
*/
private String getImagePath(String imageUrl) {
int lastSlashIndex = imageUrl.lastIndexOf("/");
String imageName = imageUrl.substring(lastSlashIndex + 1);
String imageDir = Environment.getExternalStorageDirectory()
.getPath() + "/PhotoWallFalls/";
File file = new File(imageDir);
if (!file.exists()) {
file.mkdirs();
}
String imagePath = imageDir + imageName;
return imagePath;
}
}
}
activity_main.xml:
<com.example.photowallfallsdemo.MyScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/my_scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<LinearLayout
android:id="@+id/first_column"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#4BADED"
android:layout_weight="1"
android:orientation="vertical" >
</LinearLayout>
<LinearLayout
android:id="@+id/second_column"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#4BADED"
android:layout_weight="1"
android:orientation="vertical" >
</LinearLayout>
<LinearLayout
android:id="@+id/third_column"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="#4BADED"
android:layout_weight="1"
android:orientation="vertical" >
</LinearLayout>
</LinearLayout>
</com.example.photowallfallsdemo.MyScrollView>
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