Android gets thumbnails of pictures and videos on SDcard

Ways to get thumbnail images and video thumbnails:

Java code:

Import Java.io.file;import Android.app.activity;import android.graphics.bitmap;import Android.graphics.bitmapfactory;import Android.media.thumbnailutils;import Android.os.bundle;import Android.os.environment;import Android.provider.mediastore;import Android.widget.ImageView;/** * Get thumbnails of images and videos * These two methods must be used in versions 2.2 and above, as they use the Thumbnailutils class*/ Public classAndroidtestactivity extends Activity {PrivateImageView Imagethumbnail; PrivateImageView Videothumbnail; /** Called when the activity is first created.*/@Override Public voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.main); Imagethumbnail=(ImageView) Findviewbyid (R.id.image_thumbnail); Videothumbnail=(ImageView) Findviewbyid (R.id.video_thumbnail); String ImagePath=environment.getexternalstoragedirectory (). GetAbsolutePath ()+File.separator+"Photo"+File.separator+"yexuan.jpg"; String Videopath=environment.getexternalstoragedirectory (). GetAbsolutePath ()+File.separator+"Video"+File.separator+"vinegar Lighting. avi"; Imagethumbnail.setimagebitmap (Getimagethumbnail (ImagePath, -, -)); Videothumbnail.setimagebitmap (Getvideothumbnail (Videopath, -, -, MediaStore.Images.Thumbnails.MICRO_KIND)); }    /** * Get thumbnails based on specified image path and size * This method has two benefits: * 1. Using a smaller memory space, the first fetch of the bitmap is actually null, just to read the width and height, * second Read     The bitmap is based on the proportional compressed image, the third read of the bitmap is the desired thumbnail image. * 2.     Thumbnails are not stretched for the original image, and the 2.2 version of the new tool thumbnailutils is used, so that the images generated with this tool are not stretched. * @param the path of the ImagePath image * @param width specifies the output image widths * @param height Specifies the height of the output image * @return generated thumbnails*/    PrivateBitmap Getimagethumbnail (String ImagePath,intWidthintheight) {Bitmap Bitmap=NULL; Bitmapfactory.options Options=Newbitmapfactory.options (); Options.injustdecodebounds=true; //get the width and height of this picture, note that the bitmap here is nullBitmap =bitmapfactory.decodefile (ImagePath, Options); Options.injustdecodebounds=false;//set to False//Calculating the zoom ratio        inth =Options.outheight; intW =Options.outwidth; intBewidth = w/width; intBeheight = h/height; intbe =1; if(Bewidth <beheight) { be=Bewidth; } Else{ be=Beheight; }        if(Be <=0) { be=1; } options.insamplesize=Be ; //re-read the picture, read the scaled bitmap, and note this time to set the Options.injustdecodebounds to FalseBitmap =bitmapfactory.decodefile (ImagePath, Options); //use Thumbnailutils to create thumbnails, where you want to specify which bitmap object to scaleBitmap =thumbnailutils.extractthumbnail (bitmap, width, height, thumbnailutils.options_recycle_input); returnbitmap; }    /** * Get thumbnail image of video * First create a thumbnail of a video with Thumbnailutils, and then use thumbnailutils to generate a thumbnail of the specified size.     * If the desired thumbnail width and height are less than micro_kind, then the type will use Micro_kind as the KIND value, which saves memory. * @param the path of the Videopath video * @param width Specifies the width of the output video thumbnail * @param height Specifies the height of the output video thumbnail * @param kind reference mediastore.     Constants Mini_kind and Micro_kind in the Images.thumbnails class. * Where mini_kind:512 x 384,micro_kind:96 x * * @return A video thumbnail of the specified size*/    PrivateBitmap Getvideothumbnail (String Videopath,intWidthintheight,intkind) {Bitmap Bitmap=NULL; //get thumbnail images of a videoBitmap =Thumbnailutils.createvideothumbnail (Videopath, kind); System. out. println ("W"+bitmap.getwidth ()); System. out. println ("h"+bitmap.getheight ()); Bitmap=thumbnailutils.extractthumbnail (bitmap, width, height, thumbnailutils.options_recycle_input); returnbitmap; }    }

Main.xml file:

<?xml version="1.0"encoding="Utf-8"? ><linearlayout xmlns:android="http://schemas.android.com/apk/res/android"Android:layout_width="fill_parent"Android:layout_height="fill_parent"android:orientation="Vertical"> <TextView android:layout_width="fill_parent"Android:layout_height="wrap_content"Android:text="thumbnail Image"/> <ImageView Android:id="@+id/image_thumbnail"Android:layout_width="wrap_content"Android:layout_height="wrap_content"/> <TextView android:layout_width="fill_parent"Android:layout_height="wrap_content"Android:text="Video thumbnail image"/> <ImageView Android:id="@+id/video_thumbnail"Android:layout_width="wrap_content"Android:layout_height="wrap_content"/></linearlayout>

Android gets thumbnail images of sdcard tablets and videos