如何显示保存在android中sdcard文件夹中的图像 [英] how to display images saved in sdcard folder in android

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。

从SDCard在gridview中显示图像。

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：horizo​​ntalSpacing =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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