Android 如何从特定文件夹组成GridView图像列表
我使用了Android 如何从特定文件夹组成GridView图像列表,android,adapter,android-gridview,android-sdcard,Android,Adapter,Android Gridview,Android Sdcard,我使用了GridView,在那里我可以按行和列显示我的图像。但在这种情况下,图库中的几乎所有图像都会出现在桌面上。我想要特定文件夹中的图像,如sdcard/images/aaa.jpg。你能建议我如何在下面的代码上做吗?多谢各位 这是活动课: public class CardBox extends Activity { private Cursor cursor; private int columnIndex; @Override public void onCreate(Bundle
GridView
,在那里我可以按行和列显示我的图像。但在这种情况下,图库中的几乎所有图像都会出现在桌面上。我想要特定文件夹中的图像,如sdcard/images/aaa.jpg
。你能建议我如何在下面的代码上做吗?多谢各位
这是活动课:
public class CardBox extends Activity {
private Cursor cursor;
private int columnIndex;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.cardbox);
String[] projection = {MediaStore.Images.Thumbnails._ID};
cursor = getContentResolver().query( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
projection, // Which columns to return
null, // Return all rows
null,
MediaStore.Images.Thumbnails._ID);
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
GridView sdcardImages = (GridView) findViewById(R.id.gridview);
sdcardImages.setAdapter(new ImageAdapter(this));
private class ImageAdapter extends BaseAdapter {
private Context context;
public ImageAdapter(Context localContext) {
context = localContext;
}
public int getCount() {
return cursor.getCount();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView picturesView;
if (convertView == null) {
picturesView = new ImageView(context);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value for the requested column
int imageID = cursor.getInt(columnIndex);
// Set the content of the image based on the provided URI
picturesView.setImageURI(Uri.withAppendedPath(
MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, ""+ imageID));
picturesView.setScaleType(ImageView.ScaleType.FIT_CENTER);
picturesView.setPadding(8,8,8,8);
picturesView.setLayoutParams(new GridView.LayoutParams(100, 100));
}
else {
picturesView = (ImageView)convertView;
}
return picturesView;
}
}
因为您知道所需的文件夹,所以可以首先遍历需要图像的文件夹,并在集合中存储路径,然后在适配器中使用该列表填充数据。通过这种方式进行查询
private String[] arrPath;
private boolean[] thumbnailsselection;
private int ids[];
private int count;
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, columns, null, new String[] {"%myimagesfolder%"}, orderBy); //UPDATE HERE
int image_column_index = imagecursor.getColumnIndex(MediaStore.Images.Media._ID);
count = imagecursor.getCount();
arrPath = new String[this.count];
ids = new int[count];
for (int i = 0; i < count; i++) {
imagecursor.moveToPosition(i);
ids[i] = imagecursor.getInt(image_column_index);
int dataColumnIndex = imagecursor.getColumnIndex(MediaStore.Images.Media.DATA);
arrPath[i] = imagecursor.getString(dataColumnIndex);
}
private String[]arrPath;
私有布尔[]缩略图选择;
私有int-id[];
私人整数计数;
最终字符串[]列={MediaStore.Images.Media.DATA,MediaStore.Images.Media.\u ID};
最终字符串orderBy=MediaStore.Images.Media.\u ID;
Cursor imagecursor=managedQuery(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,columns,null,新字符串[]{“%myimagesfolder%”,orderBy)//在此更新
int image\u column\u index=imagecursor.getColumnIndex(MediaStore.Images.Media.ID);
count=imagecursor.getCount();
arrPath=新字符串[this.count];
ids=新整数[计数];
for(int i=0;i
是的,这是可以应用的方法,但是它的语法是什么,我需要应用在哪里,我不知道。我已经尝试过了。活动停止。logCat是关于SqliteException的。我认为这不相关。你能用我上面的代码配置一下吗?