如何在android中显示保存在sdcard文件夹中的图像 [英] how to display images saved in sdcard folder in android
问题描述
当我正在显示保存在 sdcard 文件夹中的图像时，我找到了以下链接.
As i am working on displaying images saved in sdcard folder, I found the following link.
我正在使用以下代码从 sdcard 中的指定文件夹获取图像，但在这里我得到 0 计数.
I am using the following code to get images from specified folder in sdcard,but here i am getting 0 count.
MyCode.java
MyCode.java
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();
但是这里按照以下链接显示保存在 SD 卡中的所有图像.但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"一样文件夹 &保存在该文件夹中的图像. 我想显示该文件夹中的图像 &需要根据链接在 gridview 中显示.
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.
推荐答案
您可以从特定文件夹中获取文件路径，如下所示
You can get the path of files from a particualr folder as below
获得文件路径后，您可以在 gridview 中显示图像
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());
}
}
}
记得在 manifest 文件中添加权限
Remember to add permissionin manifest file
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
拥有写入权限的默认拥有读取权限.
By having write permission will have read permission by default.
示例
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>
geleryitem.xml
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
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;
}
}
快照
这篇关于如何在android中显示保存在sdcard文件夹中的图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
