本文介绍了如何显示保存在android中sdcard文件夹中的图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
因为我正在显示保存在sdcard文件夹中的图像，我找到了以下链接。
。
我使用以下代码从sdcard中的指定文件夹获取图像，但这里我得到0计数。
MyCode.jav
String [] projection = {MediaStore。 Images.Media._ID};
final String [] columns = {MediaStore.Images.Media.DATA，MediaStore.Images.Media._ID};
final String orderBy = MediaStore.Images.Media._ID;
Cursor imagecursor = managedQuery（MediaStore.Images.Media.EXTERNAL_CONTENT_URI，
projection，
MediaStore.Images.Media.DATA +like？，
new String [] { / my_images}，
null）;
int image_column_index = imagecursor.getColumnIndex（MediaStore.Images.Media._ID）;
this.count = imagecursor.getCount（）;
this.thumbnails = new Bitmap [this.count];
this.arrPath = new String [this.count];
this.thumbnailsselection = new boolean [this.count];
for（int i = 0; i imagecursor.moveToPosition（i）;
int id = imagecursor.getInt（image_column_index）;
int dataColumnIndex = imagecursor
.getColumnIndex（MediaStore.Images.Media.DATA）;
thumbnailails [i] = MediaStore.Images.Thumbnails.getThumbnail（
getApplicationContext（）。getContentResolver（），id，
MediaStore.Images.Thumbnails.MICRO_KIND，null）;
arrPath [i] = imagecursor.getString（dataColumnIndex）;
}
imageAdapter = new ImageAdapter（）;
secure_gallery_grid.setAdapter（imageAdapter）;
imagecursor.close（）;
但这里按照以下链接显示保存在sd卡中的所有图像。 但是在这里我想显示保存在特定文件夹中的图像，就像我创建的My_images文件夹& 我要显示该文件夹中的图片。需要在gridview中显示为每个链接。任何人都可以帮助我这个。
感谢在advacne ..
解决方案
一旦你得到文件的路径，你就可以在gridview中显示图像
ArrayList< String> f = new ArrayList< String>（）; //文件路径列表
File [] listFile;
public void getFromSdcard（）
{
文件file = new File（android.os.Environment.getExternalStorageDirectory（），TMyFolder）;
if（file.isDirectory（））
{
listFile = file.listFiles（）;
for（int i = 0; i {
f.add（listFile [i]。 getAbsolutePath（））;
}
}
}
添加权限清单文件
< uses-permission android：name =android.permission.WRITE_EXTERNAL_STORAGE/&
默认情况下，写入权限具有读取权限。
示例
main.xml
？xml version =1.0encoding =utf-8？>
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
android：layout_width =fill_parentandroid：layout_height =fill_parent>
< GridView
android：id =@ + id / PhoneImageGrid
android：layout_width =fill_parent
android：layout_height =fill_parent
android：columnWidth =90dp
android：gravity =center
android：horizontalSpacing =10dp
android：numColumns =auto_fit
android：stretchMode = columnWidth
android：verticalSpacing =10dp/>
< / RelativeLayout>
gelleryitem.xml
<？xml version =1.0encoding =utf-8？>
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
android：layout_width =fill_parentandroid：layout_height =fill_parent>
< ImageView android：id =@ + id / thumbImageandroid：layout_width =wrap_content
android：layout_height =wrap_contentandroid：layout_centerInParent =true/>
< CheckBox android：id =@ + id / itemCheckBoxandroid：layout_width =wrap_content
android：layout_height =wrap_contentandroid：layout_alignParentRight =true
android：layout_alignParentTop =true/>
< / RelativeLayout>
AndroidCustomGalleryActivity.java
public class AndroidCustomGalleryActivity extends Activity {
private int count;
private Bitmap [] thumbnailails;
private boolean [] thumbnailailsselection;
private String [] arrPath;
private ImageAdapter imageAdapter;
ArrayList< String> f = new ArrayList< String>（）; //文件路径列表
File [] listFile;
/ **在首次创建活动时调用。 * /
@Override
public void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.main）;
getFromSdcard（）;
GridView imagegrid =（GridView）findViewById（R.id.PhoneImageGrid）;
imageAdapter = new ImageAdapter（）;
imagegrid.setAdapter（imageAdapter）;
}
public void getFromSdcard（）
{
文件文件=新文件（android.os.Environment.getExternalStorageDirectory（），MapleBear ）;
if（file.isDirectory（））
{
listFile = file.listFiles（）;
for（int i = 0; i {
f.add（listFile [i]。 getAbsolutePath（））;
}
}
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter（）{
mInflater =（LayoutInflater）getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
}
public int getCount（）{
return f.size（）;
}
public Object getItem（int position）{
return position;
}
public long getItemId（int position）{
return position;
}
public查看getView（int position，View convertView，ViewGroup parent）{
ViewHolder holder;
if（convertView == null）{
holder = new ViewHolder（）;
convertView = mInflater.inflate（
R.layout.galleryitem，null）;
holder.imageview =（ImageView）convertView.findViewById（R.id.thumbImage）;
convertView.setTag（holder）;
}
else {
holder =（ViewHolder）convertView.getTag（）;
}
位图myBitmap = BitmapFactory.decodeFile（f.get（position））;
holder.imageview.setImageBitmap（myBitmap）;
return convertView;
}
}
class ViewHolder {
ImageView imageview;
}
}
/ p>
>
As i am working on displaying images saved in sdcard folder, I found the following link.
Displaying images in gridview from SDCard.
I am using the following code to get images from specified folder in sdcard,but here i am getting 0 count.
MyCode.jav
String[] projection = {MediaStore.Images.Media._ID};
final String[] columns = { MediaStore.Images.Media.DATA,MediaStore.Images.Media._ID };
final String orderBy = MediaStore.Images.Media._ID;
Cursor imagecursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection,
MediaStore.Images.Media.DATA + " like ? ",
new String[] {"/my_images"},
null);
int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
this.count = imagecursor.getCount();
this.thumbnails = new Bitmap[this.count];
this.arrPath = new String[this.count];
this.thumbnailsselection = new boolean[this.count];
for (int i = 0; i < this.count; i++) {
imagecursor.moveToPosition(i);
int id = imagecursor.getInt(image_column_index);
int dataColumnIndex = imagecursor
.getColumnIndex(MediaStore.Images.Media.DATA);
thumbnails[i] = MediaStore.Images.Thumbnails.getThumbnail(
getApplicationContext().getContentResolver(), id,
MediaStore.Images.Thumbnails.MICRO_KIND, null);
arrPath[i] = imagecursor.getString(dataColumnIndex);
}
imageAdapter = new ImageAdapter();
secure_gallery_grid.setAdapter(imageAdapter);
imagecursor.close();
But here as per the following link all the images saved in sd card are displaying. But here i want to display images which are saved in particular folder, as like i created "My_images" folder & saved images in that folder. I want to display images from that folder & need to display in gridview as per link. Can anyone please help me with this.
Thanks in advacne..
解决方案
You can get the path of files from a particualr folder as below
Once you get the path of files you ca display the images in gridview
ArrayList<String> f = new ArrayList<String>();// list of file paths
File[] listFile;
public void getFromSdcard()
{
File file= new File(android.os.Environment.getExternalStorageDirectory(),"TMyFolder");
if (file.isDirectory())
{
listFile = file.listFiles();
for (int i = 0; i < listFile.length; i++)
{
f.add(listFile[i].getAbsolutePath());
}
}
}
Remember to add permissionin manifest file
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
By having write permission will have read permission by default.
Example
main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<GridView
android:id="@+id/PhoneImageGrid"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:columnWidth="90dp"
android:gravity="center"
android:horizontalSpacing="10dp"
android:numColumns="auto_fit"
android:stretchMode="columnWidth"
android:verticalSpacing="10dp" />
</RelativeLayout>
gelleryitem.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<ImageView android:id="@+id/thumbImage" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_centerInParent="true" />
<CheckBox android:id="@+id/itemCheckBox" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentRight="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
AndroidCustomGalleryActivity.java
public class AndroidCustomGalleryActivity extends Activity {
private int count;
private Bitmap[] thumbnails;
private boolean[] thumbnailsselection;
private String[] arrPath;
private ImageAdapter imageAdapter;
ArrayList<String> f = new ArrayList<String>();// list of file paths
File[] listFile;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getFromSdcard();
GridView imagegrid = (GridView) findViewById(R.id.PhoneImageGrid);
imageAdapter = new ImageAdapter();
imagegrid.setAdapter(imageAdapter);
}
public void getFromSdcard()
{
File file= new File(android.os.Environment.getExternalStorageDirectory(),"MapleBear");
if (file.isDirectory())
{
listFile = file.listFiles();
for (int i = 0; i < listFile.length; i++)
{
f.add(listFile[i].getAbsolutePath());
}
}
}
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return f.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(
R.layout.galleryitem, null);
holder.imageview = (ImageView) convertView.findViewById(R.id.thumbImage);
convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView.getTag();
}
Bitmap myBitmap = BitmapFactory.decodeFile(f.get(position));
holder.imageview.setImageBitmap(myBitmap);
return convertView;
}
}
class ViewHolder {
ImageView imageview;
}
}
Snap shot
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