不知道这个需求是不是很变态，但是确实遇到了这样的需求。大概的意思就是先从Images数据库里，根据路径查找到这个照片的ID，然后根据ID去Thumbnail库里找到缩略图的路径。视频也是类似。下面直接贴代码，没啥好说的。
package com.binkery.util;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Video;
public final class ThumbnailQuery {
private static final String TAG = ThumbnailQuery.class.getSimpleName();
public static String queryImageThumbnailByPath(Context context, String path) {
Uri uri = Images.Media.EXTERNAL_CONTENT_URI;
String[] projection = new String[] { Images.Media._ID };
String selection = Images.Media.DATA + " = ? ";
String[] selectionArgs = new String[] { path };
Cursor cursor = query(context, uri, projection, selection,
selectionArgs);
int id = -1;
if (cursor.moveToFirst()) {
id = cursor.getInt(cursor.getColumnIndex(Images.Media._ID));
}
cursor.close();
if (id == -1) {
return null;
}
uri = Images.Thumbnails.EXTERNAL_CONTENT_URI;
projection = new String[] { Images.Thumbnails.DATA };
selection = Images.Thumbnails.IMAGE_ID + " = ? ";
selectionArgs = new String[] { String.valueOf(id) };
cursor = query(context, uri, projection, selection, selectionArgs);
String thumbnail = null;
if (cursor.moveToFirst()) {
int idxData = cursor.getColumnIndex(Images.Thumbnails.DATA);
thumbnail = cursor.getString(idxData);
}
cursor.close();
return thumbnail;
}
public static String queryVideoThumbnailByPath(Context context, String path) {
Uri uri = Video.Media.EXTERNAL_CONTENT_URI;
String[] projection = new String[] { Video.Media._ID };
String selection = Video.Media.DATA + " = ? ";
String[] selectionArgs = new String[] { path };
Cursor cursor = query(context, uri, projection, selection,
selectionArgs);
int mediaId = -1;
if (cursor.moveToFirst()) {
int idxId = cursor.getColumnIndex(Video.Media._ID);
mediaId = cursor.getInt(idxId);
}
cursor.close();
if (mediaId == -1) {
return null;
}
uri = Video.Thumbnails.EXTERNAL_CONTENT_URI;
projection = new String[] { Video.Thumbnails.DATA };
selection = Video.Thumbnails.VIDEO_ID + " = ? ";
selectionArgs = new String[] { String.valueOf(mediaId) };
cursor = query(context, uri, projection, selection, selectionArgs);
String thumbnail = null;
if (cursor.moveToFirst()) {
int idxData = cursor.getColumnIndex(Video.Thumbnails.DATA);
thumbnail = cursor.getString(idxData);
}
cursor.close();
return thumbnail;
}
private static Cursor query(Context context, Uri uri, String[] projection,
String selection, String[] selectionArgs) {
ContentResolver cr = context.getContentResolver();
Cursor cursor = cr.query(uri, projection, selection, selectionArgs,
null);
return cursor;
}
}
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本文标题： 根据图片/视频路径获取缩略图路径
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