package android.apps;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.Display;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
public class GetImagesFromSDCard extends Activity implements OnItemClickListener
{
private GridView sdcardImages;
private ImageAdapter imageAdapter;
// private Display display;
public static int imagePosition;
public static Uri[] uriArray;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
// 影藏顶部程序名称 写在setContentView(R.layout.gallery_1);之前，不然报错
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.gallery_1);
// 影藏顶部电量等图标
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.sdcard);
// display = ((WindowManager)
// getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
initView();
// 显示标题栏的进度圈
setProgressBarIndeterminateVisibility(true);
loadImages();
}
private void initView()
{
sdcardImages = (GridView) findViewById(R.id.sdcard);
// 设置图片显示的列数
// sdcardImages.setNumColumns(display.getWidth() / 95);
// //By default, children are clipped to the padding of the ViewGroup
// sdcardImages.setClipToPadding(false);
sdcardImages.setNumColumns(3);
sdcardImages.setClipToPadding(true);
// 设置监听
sdcardImages.setOnItemClickListener(GetImagesFromSDCard.this);
// 构造函数 参数相当于（this）
imageAdapter = new ImageAdapter(getApplicationContext());
// 为图片添加适配器
sdcardImages.setAdapter(imageAdapter);
}
private void loadImages()
{
// 得到横屏时临时存储的数据
final Object data = getLastNonConfigurationInstance();
if (data == null)
{// 如果没有数据则从新加载
new LoadImagesFromSDCard().execute();
} else
{
final LoadedImage[] photos = (LoadedImage[]) data;
if (photos.length == 0)
{
new LoadImagesFromSDCard().execute();
}
for (LoadedImage photo : photos)
{
addImage(photo);
}
}
}
private void addImage(LoadedImage... value)
{
for (LoadedImage image : value)
{
// 把图片添加到适配器里面，以便调整图片的属性
imageAdapter.addPhoto(image);
imageAdapter.notifyDataSetChanged();
}
}
// //当横屏时：得到竖屏时临时存储的数据
// @Override
// public Object onRetainNonConfigurationInstance() {
// final GridView grid = sdcardImages;
// final int count = grid.getChildCount();//这里是竖屏时已经加载的图片数量
// final LoadedImage[] list = new LoadedImage[count];
//
// for (int i = 0; i < count; i++) {
// final ImageView v = (ImageView) grid.getChildAt(i);
// //得到先前的位图
// list[i] = new LoadedImage(
// ((BitmapDrawable) v.getDrawable()).getBitmap());
// }
// return list;
// }
/* 读取sdcard上的图片 */
class LoadImagesFromSDCard extends AsyncTask<Object, LoadedImage, Object>
{
@Override
protected Object doInBackground(Object... params)
{
Bitmap bitmap = null;// old Bitmap (位图)
Bitmap newBitmap = null;// new Bitmap
Uri uri = null;
// 想要的返回值所在的列
String[] projection =
{ MediaStore.Images.Thumbnails._ID };
// 图片信息存储在 android.provider.MediaStore.Images.Thumbnails数据库
// 快速查询数据库中的图片对应存放路劲
Cursor cursor = managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, null, null, null);
// List// of// columns// to// return// ：想要他返回的列// Return all rows
int columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
uriArray = new Uri[cursor.getCount()];// 把图片路径放在数组中
int i = 0;
while (cursor.moveToNext() && i < cursor.getCount())
{ // 移到指定的位置，遍历数据库
cursor.moveToPosition(i);
uri = Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, cursor.getInt(columnIndex) + "");
uriArray[i] = uri;
try
{
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri));
if (bitmap != null)
{
// 将原来的位图转换成新的位图
newBitmap = Bitmap.createScaledBitmap(bitmap, 80, 80, true);
bitmap.recycle();// 释放内存
if (newBitmap != null)
{
publishProgress(new LoadedImage(newBitmap));
}
}
} catch (IOException e)
{
}
i++;
}
cursor.close();// 关闭数据库
return null;
}
@Override
public void onProgressUpdate(LoadedImage... value)
{
addImage(value);
}
// 当加载完时停止标题栏的进度圈
@Override
protected void onPostExecute(Object result)
{
setProgressBarIndeterminateVisibility(false);
}
}
class ImageAdapter extends BaseAdapter
{
private Context mContext;
private ArrayList<LoadedImage> photos = new ArrayList<LoadedImage>();
public ImageAdapter(Context context)
{
mContext = context;
}
// 把图片添加到数组
public void addPhoto(LoadedImage photo)
{
photos.add(photo);
}
// 得到图片数量
public int getCount()
{
return photos.size();
}
public Object getItem(int position)
{
return photos.get(position);
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
final ImageView imageView;
if (convertView == null)
{
imageView = new ImageView(mContext);
} else
{
imageView = (ImageView) convertView;
}
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
imageView.setPadding(1, 1, 1, 1);// 控制图片距离窗口的位置
imageView.setImageBitmap(photos.get(position).getBitmap());
return imageView;
}
}
private static class LoadedImage
{
Bitmap mBitmap;
LoadedImage(Bitmap bitmap)
{
mBitmap = bitmap;
}
public Bitmap getBitmap()
{
return mBitmap;
}
}
// 图片点击监听
public void onItemClick(AdapterView<?> parent, View v, int position, long id)
{
// 把图片位置赋给静态变量imagePosition，方便后面调用
imagePosition = position;
// 跳转到大图浏览
Intent intent = new Intent();
intent.setClass(GetImagesFromSDCard.this, Gallery1.class);
startActivity(intent);
}
}