首先贴上一个activity的代码
public class ChatPictureChooseActivity extends BaseActivity implements ListImageDirPopupWindow.OnImageDirSelected, MyAdapter.OnSelectListener {
@InjectView(R.id.tv_app_title)
TextView tvAppTitle;
private ProgressDialog mProgressDialog;
/**
* 存储文件夹中的图片数量
*/
private int mPicsSize;
/**
* 图片数量最多的文件夹
*/
private File mImgDir;
/**
* 所有的图片
*/
private List<String> mImgs;
private GridView mGirdView;
private MyAdapter mAdapter;
/**
* 临时的辅助类，用于防止同一个文件夹的多次扫描
*/
private HashSet<String> mDirPaths = new HashSet<String>();
/**
* 扫描拿到所有的图片文件夹
*/
private List<ImageFloder> mImageFloders = new ArrayList<ImageFloder>();
private RelativeLayout mBottomLy;
private TextView mChooseDir;
private TextView mImageCount;
private TextView mSend;
int totalCount = 0;
private int mScreenHeight;
private ListImageDirPopupWindow mListImageDirPopupWindow;
ImageFloder imageFloders;
String fileName;
ArrayList<String> mSelectedImages = new ArrayList<String>();
int number = 0;
int size = 0;
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
mProgressDialog.dismiss();
// 为View绑定数据
data2View();
// 初始化展示文件夹的popupWindw
initListDirPopupWindw();
}
};
/**
* 为View绑定数据
*/
private void data2View() {
if (mImgDir == null) {
Toast.makeText(getApplicationContext(), "一张图片没扫描到",
Toast.LENGTH_SHORT).show();
return;
}
number = getIntent().getIntExtra("number",0);
size = getIntent().getIntExtra("size",-1);
mImgs = Arrays.asList(mImgDir.list());
/**
* 可以看到文件夹的路径和图片的路径分开保存，极大的减少了内存的消耗；
*/
mAdapter = new MyAdapter(getApplicationContext(), mImgs,
R.layout.grid_item, mImgDir.getAbsolutePath(),number,size);
mAdapter.setOnSelectListener(this);
mGirdView.setAdapter(mAdapter);
mChooseDir.setText(fileName);
mImageCount.setText(mPicsSize + "张");
mSend.setEnabled(false);
}
/**
* 初始化展示文件夹的popupWindw
*/
private void initListDirPopupWindw() {
mListImageDirPopupWindow = new ListImageDirPopupWindow(
LayoutParams.MATCH_PARENT, (int) (mScreenHeight * 0.7),
mImageFloders, LayoutInflater.from(getApplicationContext())
.inflate(R.layout.list_dir, null));
mListImageDirPopupWindow.setOnDismissListener(new OnDismissListener() {
@Override
public void onDismiss() {
// 设置背景颜色变暗
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.alpha = 1.0f;
getWindow().setAttributes(lp);
}
});
// 设置选择文件夹的回调
mListImageDirPopupWindow.setOnImageDirSelected(this);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_picture_choose);
ButterKnife.inject(this);
tvAppTitle.setText(getResources().getString(R.string.chat_choose_title));
DisplayMetrics outMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
mScreenHeight = outMetrics.heightPixels;
initView();
getImages();
initEvent();
}
/**
* 利用ContentProvider扫描手机中的图片，此方法在运行在子线程中 完成图片的扫描，最终获得jpg最多的那个文件夹
*/
private void getImages() {
if (!Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
Toast.makeText(this, "暂无外部存储", Toast.LENGTH_SHORT).show();
return;
}
// 显示进度条
mProgressDialog = ProgressDialog.show(this, null, "正在加载...");
new Thread(new Runnable() {
@Override
public void run() {
String firstImage = null;
Uri mImageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
ContentResolver mContentResolver = ChatPictureChooseActivity.this
.getContentResolver();
// 只查询jpeg和png的图片
Cursor mCursor = mContentResolver.query(mImageUri, null,
MediaStore.Images.Media.MIME_TYPE + "=? or "
+ MediaStore.Images.Media.MIME_TYPE + "=?",
new String[]{"image/jpeg", "image/png"},
MediaStore.Images.Media.DATE_MODIFIED);
Log.e("TAG", mCursor.getCount() + "");
while (mCursor.moveToNext()) {
// 获取图片的路径
String path = mCursor.getString(mCursor
.getColumnIndex(MediaStore.Images.Media.DATA));
Log.e("TAG", path);
// 拿到第一张图片的路径
if (firstImage == null)
firstImage = path;
// 获取该图片的父路径名
File parentFile = new File(path).getParentFile();
if (parentFile == null)
continue;
String dirPath = parentFile.getAbsolutePath();
ImageFloder imageFloder = null;
// 利用一个HashSet防止多次扫描同一个文件夹（不加这个判断，图片多起来还是相当恐怖的~~）
if (mDirPaths.contains(dirPath)) {
continue;
} else {
mDirPaths.add(dirPath);
// 初始化imageFloder
imageFloder = new ImageFloder();
imageFloder.setDir(dirPath);
imageFloder.setFirstImagePath(path);
}
int picSize = 0;
try {
picSize = parentFile.list(new FilenameFilter() {
@Override
public boolean accept(File dir, String filename) {
return filename.endsWith(".jpg")
|| filename.endsWith(".png")
|| filename.endsWith(".jpeg");
}
}).length;
}
catch (Exception e)
{
e.printStackTrace();
}
totalCount += picSize;
imageFloder.setCount(picSize);
mImageFloders.add(imageFloder);
if (picSize > mPicsSize) {
mPicsSize = picSize;
mImgDir = parentFile;
fileName = imageFloder.getName();
}
}
mCursor.close();
// 扫描完成，辅助的HashSet也就可以释放内存了
mDirPaths = null;
// 通知Handler扫描图片完成
mHandler.sendEmptyMessage(0x110);
}
}).start();
}
/**
* 初始化View
*/
private void initView() {
mGirdView = (GridView) findViewById(R.id.id_gridView);
mChooseDir = (TextView) findViewById(R.id.id_choose_dir);
mImageCount = (TextView) findViewById(R.id.id_total_count);
mSend = (TextView) findViewById(R.id.id_send);
mBottomLy = (RelativeLayout) findViewById(R.id.id_bottom_ly);
}
private void initEvent() {
/**
* 为底部的布局设置点击事件，弹出popupWindow
*/
mBottomLy.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
mListImageDirPopupWindow
.setAnimationStyle(R.style.anim_popup_dir);
mListImageDirPopupWindow.showAsDropDown(mBottomLy, 0, 0);
// 设置背景颜色变暗
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.alpha = .3f;
getWindow().setAttributes(lp);
}
});
mSend.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent();
Bundle bundle = new Bundle();
bundle.putStringArrayList("lists", mSelectedImages);
intent.putExtras(bundle);
setResult(Activity.RESULT_OK, intent);
MyAdapter.mSelectedImage = new ArrayList<String>();
finish();
}
});
}
@Override
public void selected(ImageFloder floder) {
mImgDir = new File(floder.getDir());
mImgs = Arrays.asList(mImgDir.list(new FilenameFilter() {
@Override
public boolean accept(File dir, String filename) {
return filename.endsWith(".jpg") || filename.endsWith(".png")
|| filename.endsWith(".jpeg");
}
}));
/**
* 可以看到文件夹的路径和图片的路径分开保存，极大的减少了内存的消耗；
*/
mAdapter = new MyAdapter(getApplicationContext(), mImgs,
R.layout.grid_item, mImgDir.getAbsolutePath());
mGirdView.setAdapter(mAdapter);
mAdapter.setOnSelectListener(this);
// mAdapter.notifyDataSetChanged();
mImageCount.setText(floder.getCount() + "张");
mChooseDir.setText(floder.getName());
mListImageDirPopupWindow.dismiss();
}
@Override
public void onSelectImg(List<String> mSelectedImage) {
mSelectedImages.clear();
mSelectedImages.addAll(mSelectedImage);
if (mSelectedImage.size() == 0) {
mSend.setEnabled(false);
mSend.setTextColor(getResources().getColor(R.color.white));
mSend.setText("发送");
} else {
mSend.setEnabled(true);
mSend.setTextColor(getResources().getColor(R.color.app_title_color_green));
mSend.setText(mSelectedImage.size() + " 发送");
}
}
@OnClick({R.id.ll_app_cancel})
void onClick(View view) {
switch (view.getId()) {
case R.id.ll_app_cancel:
finish();
break;
// case R.id.tv_app_title:
// finish();
// break;
}
}
}
接下来是一堆xml和类
一个bean类 ImageFloder
public class ImageFloder
{
/**
* 图片的文件夹路径
*/
private String dir;
/**
* 第一张图片的路径
*/
private String firstImagePath;
/**
* 文件夹的名称
*/
private String name;
/**
* 图片的数量
*/
private int count;
public String getDir()
{
return dir;
}
public void setDir(String dir)
{
this.dir = dir;
int lastIndexOf = this.dir.lastIndexOf("/");
this.name = this.dir.substring(lastIndexOf);
}
public String getFirstImagePath()
{
return firstImagePath;
}
public void setFirstImagePath(String firstImagePath)
{
this.firstImagePath = firstImagePath;
}
public String getName()
{
return name;
}
public int getCount()
{
return count;
}
public void setCount(int count)
{
this.count = count;
}
}
ListImageDirPopupWindow
public class ListImageDirPopupWindow extends BasePopupWindowForListView<ImageFloder>
{
private ListView mListDir;
public ListImageDirPopupWindow(int width, int height,
List<ImageFloder> datas, View convertView)
{
super(convertView, width, height, true, datas);
}
@Override
public void initViews()
{
mListDir = (ListView) findViewById(R.id.id_list_dir);
mListDir.setAdapter(new CommonAdapter<ImageFloder>(context, mDatas,
R.layout.list_dir_item)
{
@Override
public void convert(ViewHolder helper, ImageFloder item,int position)
{
helper.setText(R.id.id_dir_item_name, item.getName());
helper.setImageByUrl(R.id.id_dir_item_image,
item.getFirstImagePath());
helper.setText(R.id.id_dir_item_count, item.getCount() + "张");
}
});
}
public interface OnImageDirSelected
{
void selected(ImageFloder floder);
}
private OnImageDirSelected mImageDirSelected;
public void setOnImageDirSelected(OnImageDirSelected mImageDirSelected)
{
this.mImageDirSelected = mImageDirSelected;
}
@Override
public void initEvents()
{
mListDir.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id)
{
if (mImageDirSelected != null)
{
mImageDirSelected.selected(mDatas.get(position));
}
}
});
}
@Override
public void init()
{
// TODO Auto-generated method stub
}
@Override
protected void beforeInitWeNeedSomeParams(Object... params)
{
// TODO Auto-generated method stub
}
}
MyAdapter
public class MyAdapter extends CommonAdapter<String>
{
/**
* 用户选择的图片，存储为图片的完整路径
*/
public static List<String> mSelectedImage = new LinkedList<String>();
/**
* 文件夹路径
*/
private String mDirPath;
private int number;
private int size;
private OnSelectListener onSelectListener;
public void setOnSelectListener(OnSelectListener onSelectListener) {
this.onSelectListener = onSelectListener;
}
public MyAdapter(Context context, List<String> mDatas, int itemLayoutId,
String dirPath)
{
super(context, mDatas, itemLayoutId);
this.mDirPath = dirPath;
}
public MyAdapter(Context context, List<String> mDatas, int itemLayoutId,
String dirPath,int number)
{
super(context, mDatas, itemLayoutId);
this.mDirPath = dirPath;
this.number = number;
}
public MyAdapter(Context context, List<String> mDatas, int itemLayoutId,
String dirPath,int number,int size)
{
super(context, mDatas, itemLayoutId);
this.mDirPath = dirPath;
this.number = number;
this.size = size;
}
@Override
public void convert(final com.zhy.utils.ViewHolder helper, final String item,int position)
{
//设置no_pic
helper.setImageResource(R.id.id_item_image, R.drawable.pictures_no);
//设置no_selected
helper.setImageResource(R.id.id_item_select,
R.drawable.picture_unselected);
//设置图片
helper.setImageByUrl(R.id.id_item_image, mDirPath + "/" + item);
final ImageView mImageView = helper.getView(R.id.id_item_image);
final ImageView mSelect = helper.getView(R.id.id_item_select);
mImageView.setColorFilter(null);
//设置ImageView的点击事件
mImageView.setOnClickListener(new OnClickListener()
{
//选择，则将图片变暗，反之则反之
@Override
public void onClick(View v)
{
// 已经选择过该图片
if (mSelectedImage.contains(mDirPath + "/" + item))
{
mSelectedImage.remove(mDirPath + "/" + item);
mSelect.setImageResource(R.drawable.picture_unselected);
mImageView.setColorFilter(null);
} else
// 未选择该图片
{
if (mSelectedImage.size()>=size-number)
{
Toast.makeText(mContext,"最多添加"+(size-number)+"张图片",Toast.LENGTH_LONG).show();
return;
}
mSelectedImage.add(mDirPath + "/" + item);
mSelect.setImageResource(R.drawable.pictures_selected);
mImageView.setColorFilter(Color.parseColor("#77000000"));
}
if (onSelectListener!=null)
{
onSelectListener.onSelectImg(mSelectedImage);
}
}
});
/**
* 已经选择过的图片，显示出选择过的效果
*/
if (mSelectedImage.contains(mDirPath + "/" + item))
{
mSelect.setImageResource(R.drawable.pictures_selected);
mImageView.setColorFilter(Color.parseColor("#77000000"));
}
}
public interface OnSelectListener
{
void onSelectImg(List<String> mSelectedImage);
}
}
BasePopupWindowForListView
public abstract class BasePopupWindowForListView<T> extends PopupWindow
{
/**
* 布局文件的最外层View
*/
protected View mContentView;
protected Context context;
/**
* ListView的数据集
*/
protected List<T> mDatas;
public BasePopupWindowForListView(View contentView, int width, int height,
boolean focusable)
{
this(contentView, width, height, focusable, null);
}
public BasePopupWindowForListView(View contentView, int width, int height,
boolean focusable, List<T> mDatas)
{
this(contentView, width, height, focusable, mDatas, new Object[0]);
}
public BasePopupWindowForListView(View contentView, int width, int height,
boolean focusable, List<T> mDatas, Object... params)
{
super(contentView, width, height, focusable);
this.mContentView = contentView;
context = contentView.getContext();
if (mDatas != null)
this.mDatas = mDatas;
if (params != null && params.length > 0)
{
beforeInitWeNeedSomeParams(params);
}
setBackgroundDrawable(new BitmapDrawable());
setTouchable(true);
setOutsideTouchable(true);
setTouchInterceptor(new OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
if (event.getAction() == MotionEvent.ACTION_OUTSIDE)
{
dismiss();
return true;
}
return false;
}
});
initViews();
initEvents();
init();
}
protected abstract void beforeInitWeNeedSomeParams(Object... params);
public abstract void initViews();
public abstract void initEvents();
public abstract void init();
public View findViewById(int id)
{
return mContentView.findViewById(id);
}
protected static int dpToPx(Context context, int dp)
{
return (int) (context.getResources().getDisplayMetrics().density * dp + 0.5f);
}
}
CommonAdapter
public abstract class CommonAdapter<T> extends BaseAdapter
{
protected LayoutInflater mInflater;
protected Context mContext;
protected List<T> mDatas;
protected final int mItemLayoutId;
public CommonAdapter(Context context, List<T> mDatas, int itemLayoutId)
{
this.mContext = context;
this.mInflater = LayoutInflater.from(mContext);
this.mDatas = mDatas;
this.mItemLayoutId = itemLayoutId;
}
@Override
public int getCount()
{
return mDatas.size();
}
@Override
public T getItem(int position)
{
return mDatas.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
final ViewHolder viewHolder = getViewHolder(position, convertView,
parent);
convert(viewHolder, getItem(position),position);
return viewHolder.getConvertView();
}
public abstract void convert(ViewHolder helper, T item,int position);
private ViewHolder getViewHolder(int position, View convertView,
ViewGroup parent)
{
return ViewHolder.get(mContext, convertView, parent, mItemLayoutId,
position);
}
}
ImageLoader
public class ImageLoader
{
/**
* 图片缓存的核心类
*/
private LruCache<String, Bitmap> mLruCache;
/**
* 线程池
*/
private ExecutorService mThreadPool;
/**
* 线程池的线程数量，默认为1
*/
private int mThreadCount = 1;
/**
* 队列的调度方式
*/
private Type mType = Type.LIFO;
/**
* 任务队列
*/
private LinkedList<Runnable> mTasks;
/**
* 轮询的线程
*/
private Thread mPoolThread;
private Handler mPoolThreadHander;
/**
* 运行在UI线程的handler，用于给ImageView设置图片
*/
private Handler mHandler;
/**
* 引入一个值为1的信号量，防止mPoolThreadHander未初始化完成
*/
private volatile Semaphore mSemaphore = new Semaphore(0);
/**
* 引入一个值为1的信号量，由于线程池内部也有一个阻塞线程，防止加入任务的速度过快，使LIFO效果不明显
*/
private volatile Semaphore mPoolSemaphore;
private static ImageLoader mInstance;
/**
* 队列的调度方式
*
* @author org.zhy
*
*/
public enum Type
{
FIFO, LIFO
}
/**
* 单例获得该实例对象
*
* @return
*/
public static ImageLoader getInstance()
{
if (mInstance == null)
{
synchronized (ImageLoader.class)
{
if (mInstance == null)
{
mInstance = new ImageLoader(1, Type.LIFO);
}
}
}
return mInstance;
}
private ImageLoader(int threadCount, Type type)
{
init(threadCount, type);
}
private void init(int threadCount, Type type)
{
// loop thread
mPoolThread = new Thread()
{
@Override
public void run()
{
Looper.prepare();
mPoolThreadHander = new Handler()
{
@Override
public void handleMessage(Message msg)
{
mThreadPool.execute(getTask());
try
{
mPoolSemaphore.acquire();
} catch (InterruptedException e)
{
}
}
};
// 释放一个信号量
mSemaphore.release();
Looper.loop();
}
};
mPoolThread.start();
// 获取应用程序最大可用内存
int maxMemory = (int) Runtime.getRuntime().maxMemory();
int cacheSize = maxMemory / 8;
mLruCache = new LruCache<String, Bitmap>(cacheSize)
{
@Override
protected int sizeOf(String key, Bitmap value)
{
return value.getRowBytes() * value.getHeight();
}
};
mThreadPool = Executors.newFixedThreadPool(threadCount);
mPoolSemaphore = new Semaphore(threadCount);
mTasks = new LinkedList<Runnable>();
mType = type == null ? Type.LIFO : type;
}
/**
* 加载图片
*
* @param path
* @param imageView
*/
public void loadImage(final String path, final ImageView imageView)
{
// set tag
imageView.setTag(path);
// UI线程
if (mHandler == null)
{
mHandler = new Handler()
{
@Override
public void handleMessage(Message msg)
{
ImgBeanHolder holder = (ImgBeanHolder) msg.obj;
ImageView imageView = holder.imageView;
Bitmap bm = holder.bitmap;
String path = holder.path;
if (imageView.getTag().toString().equals(path))
{
imageView.setImageBitmap(bm);
}
}
};
}
Bitmap bm = getBitmapFromLruCache(path);
if (bm != null)
{
ImgBeanHolder holder = new ImgBeanHolder();
holder.bitmap = bm;
holder.imageView = imageView;
holder.path = path;
Message message = Message.obtain();
message.obj = holder;
mHandler.sendMessage(message);
} else
{
addTask(new Runnable()
{
@Override
public void run()
{
ImageSize imageSize = getImageViewWidth(imageView);
int reqWidth = imageSize.width;
int reqHeight = imageSize.height;
Bitmap bm = decodeSampledBitmapFromResource(path, reqWidth,
reqHeight);
addBitmapToLruCache(path, bm);
ImgBeanHolder holder = new ImgBeanHolder();
holder.bitmap = getBitmapFromLruCache(path);
holder.imageView = imageView;
holder.path = path;
Message message = Message.obtain();
message.obj = holder;
// Log.e("TAG", "mHandler.sendMessage(message);");
mHandler.sendMessage(message);
mPoolSemaphore.release();
}
});
}
}
/**
* 添加一个任务
*
* @param runnable
*/
private synchronized void addTask(Runnable runnable)
{
try
{
// 请求信号量，防止mPoolThreadHander为null
if (mPoolThreadHander == null)
mSemaphore.acquire();
} catch (InterruptedException e)
{
}
mTasks.add(runnable);
mPoolThreadHander.sendEmptyMessage(0x110);
}
/**
* 取出一个任务
*
* @return
*/
private synchronized Runnable getTask()
{
if (mType == Type.FIFO)
{
return mTasks.removeFirst();
} else if (mType == Type.LIFO)
{
return mTasks.removeLast();
}
return null;
}
/**
* 单例获得该实例对象
*
* @return
*/
public static ImageLoader getInstance(int threadCount, Type type)
{
if (mInstance == null)
{
synchronized (ImageLoader.class)
{
if (mInstance == null)
{
mInstance = new ImageLoader(threadCount, type);
}
}
}
return mInstance;
}
/**
* 根据ImageView获得适当的压缩的宽和高
*
* @param imageView
* @return
*/
private ImageSize getImageViewWidth(ImageView imageView)
{
ImageSize imageSize = new ImageSize();
final DisplayMetrics displayMetrics = imageView.getContext()
.getResources().getDisplayMetrics();
final LayoutParams params = imageView.getLayoutParams();
int width = params.width == LayoutParams.WRAP_CONTENT ? 0 : imageView
.getWidth(); // Get actual image width
if (width <= 0)
width = params.width; // Get layout width parameter
if (width <= 0)
width = getImageViewFieldValue(imageView, "mMaxWidth"); // Check
// maxWidth
// parameter
if (width <= 0)
width = displayMetrics.widthPixels;
int height = params.height == LayoutParams.WRAP_CONTENT ? 0 : imageView
.getHeight(); // Get actual image height
if (height <= 0)
height = params.height; // Get layout height parameter
if (height <= 0)
height = getImageViewFieldValue(imageView, "mMaxHeight"); // Check
// maxHeight
// parameter
if (height <= 0)
height = displayMetrics.heightPixels;
imageSize.width = width;
imageSize.height = height;
return imageSize;
}
/**
* 从LruCache中获取一张图片，如果不存在就返回null。
*/
private Bitmap getBitmapFromLruCache(String key)
{
return mLruCache.get(key);
}
/**
* 往LruCache中添加一张图片
*
* @param key
* @param bitmap
*/
private void addBitmapToLruCache(String key, Bitmap bitmap)
{
if (getBitmapFromLruCache(key) == null)
{
if (bitmap != null)
mLruCache.put(key, bitmap);
}
}
/**
* 计算inSampleSize，用于压缩图片
*
* @param options
* @param reqWidth
* @param reqHeight
* @return
*/
private int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight)
{
// 源图片的宽度
int width = options.outWidth;
int height = options.outHeight;
int inSampleSize = 1;
if (width > reqWidth && height > reqHeight)
{
// 计算出实际宽度和目标宽度的比率
int widthRatio = Math.round((float) width / (float) reqWidth);
int heightRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = Math.max(widthRatio, heightRatio);
}
return inSampleSize;
}
/**
* 根据计算的inSampleSize，得到压缩后图片
*
* @param pathName
* @param reqWidth
* @param reqHeight
* @return
*/
private Bitmap decodeSampledBitmapFromResource(String pathName,
int reqWidth, int reqHeight)
{
// 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,
reqHeight);
// 使用获取到的inSampleSize值再次解析图片
options.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeFile(pathName, options);
return bitmap;
}
private class ImgBeanHolder
{
Bitmap bitmap;
ImageView imageView;
String path;
}
private class ImageSize
{
int width;
int height;
}
/**
* 反射获得ImageView设置的最大宽度和高度
*
* @param object
* @param fieldName
* @return
*/
private static int getImageViewFieldValue(Object object, String fieldName)
{
int value = 0;
try
{
Field field = ImageView.class.getDeclaredField(fieldName);
field.setAccessible(true);
int fieldValue = (Integer) field.get(object);
if (fieldValue > 0 && fieldValue < Integer.MAX_VALUE)
{
value = fieldValue;
Log.e("TAG", value + "");
}
} catch (Exception e)
{
}
return value;
}
}
ViewHolder
public class ViewHolder
{
private final SparseArray<View> mViews;
private int mPosition;
private View mConvertView;
private ViewHolder(Context context, ViewGroup parent, int layoutId,
int position)
{
this.mPosition = position;
this.mViews = new SparseArray<View>();
mConvertView = LayoutInflater.from(context).inflate(layoutId, parent,
false);
// setTag
mConvertView.setTag(this);
}
/**
* 拿到一个ViewHolder对象
*
* @param context
* @param convertView
* @param parent
* @param layoutId
* @param position
* @return
*/
public static ViewHolder get(Context context, View convertView,
ViewGroup parent, int layoutId, int position)
{
ViewHolder holder = null;
if (convertView == null)
{
holder = new ViewHolder(context, parent, layoutId, position);
} else
{
holder = (ViewHolder) convertView.getTag();
holder.mPosition = position;
}
return holder;
}
public View getConvertView()
{
return mConvertView;
}
/**
* 通过控件的Id获取对于的控件，如果没有则加入views
*
* @param viewId
* @return
*/
public <T extends View> T getView(int viewId)
{
View view = mViews.get(viewId);
if (view == null)
{
view = mConvertView.findViewById(viewId);
mViews.put(viewId, view);
}
return (T) view;
}
/**
* 为TextView设置字符串
*
* @param viewId
* @param text
* @return
*/
public ViewHolder setText(int viewId, String text)
{
TextView view = getView(viewId);
view.setText(text);
return this;
}
/**
* 为ImageView设置图片
*
* @param viewId
* @param drawableId
* @return
*/
public ViewHolder setImageResource(int viewId, int drawableId)
{
ImageView view = getView(viewId);
view.setImageResource(drawableId);
return this;
}
/**
* 为ImageView设置图片
*
* @param viewId
* @param drawableId
* @return
*/
public ViewHolder setImageBitmap(int viewId, Bitmap bm)
{
ImageView view = getView(viewId);
view.setImageBitmap(bm);
return this;
}
/**
* 为ImageView设置图片
*
* @param viewId
* @param drawableId
* @return
*/
public ViewHolder setImageByUrl(int viewId, String url)
{
ImageLoader.getInstance(3,Type.LIFO).loadImage(url, (ImageView) getView(viewId));
return this;
}
public int getPosition()
{
return mPosition;
}
}