android学习3
MainActivity
package com.zhy.imageloader;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.provider.MediaStore;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;
import android.widget.GridView;
import android.widget.PopupWindow.OnDismissListener;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.zhy.bean.ImageFloder;
import com.zhy.imageloader.ListImageDirPopupWindow.OnImageDirSelected;
public class MainActivity extends Activity implements OnImageDirSelected
{
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;
int totalCount = 0;
private int mScreenHeight;
private ListImageDirPopupWindow mListImageDirPopupWindow;
private Handler mHandler = new Handler()
{
public void handleMessage(android.os.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(), "擦，一张图片没扫描到",
Toast.LENGTH_SHORT).show();
return;
}
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());
mGirdView.setAdapter(mAdapter);
mImageCount.setText(totalCount + "张");
};
/**
* 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_main);
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 = MainActivity.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 = parentFile.list(new FilenameFilter()
{
@Override
public boolean accept(File dir, String filename)
{
if (filename.endsWith(".jpg")
|| filename.endsWith(".png")
|| filename.endsWith(".jpeg"))
return true;
return false;
}
}).length;
totalCount += picSize;
imageFloder.setCount(picSize);
mImageFloders.add(imageFloder);
if (picSize > mPicsSize)
{
mPicsSize = picSize;
mImgDir = parentFile;
}
}
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);
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);
}
});
}
@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)
{
if (filename.endsWith(".jpg") || filename.endsWith(".png")
|| filename.endsWith(".jpeg"))
return true;
return false;
}
}));
/**
* 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.notifyDataSetChanged();
mImageCount.setText(floder.getCount() + "张");
mChooseDir.setText(floder.getName());
mListImageDirPopupWindow.dismiss();
}
}