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    <p>First define xml</p> <pre><code>&lt;? Xml version = “1.0″ encoding = “utf-8″?&gt; &lt;RelativeLayout xmlns: android = “http://schemas.android.com/apk/res/android” android: orientation = “vertical” the android: layout_width = “fill_parent The android: layout_height = “fill_parent The android: background = “55 million” &gt; &lt;ImageSwitcher / / this control with the Gallery often used, remember android: id = “@ + the id / in switcher ‘” the android: layout_width = “wrap_content The android: layout_height = “350dip The android: layout_alignParentLeft = “true” android: layout_alignParentRight = “true” /&gt; &lt; Gallery android: id = “@ + id / mygallery” the android: layout_width = “fill_parent The android: layout_height = “80dp” android: layout_alignParentBottom = “true” android: layout_alignParentLeft = “true” android: gravity = “center_vertical” android: spacing = “16dp” /&gt; &lt;/ RelativeLayout&gt; </code></pre> <p>Two. Activity in a custom display</p> <pre><code>package com.ldci.second.mypnone; import java.io.File; import java.util.ArrayList; import of java.util.List; import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import the android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.view.View.OnClickListener; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.Toast; import android.widget.ViewSwitcher; import android.widget.AdapterView.OnItemClickListener; import android.widget.Gallery.LayoutParams; public class BgPictureShowActivity extends Activity implements AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory { the private List &lt;String&gt; the ImageList; private String [] list; private ImageSwitcher mSwitcher; public void onCreate (Bundle savedInstanceState) { super.onCreate (savedInstanceState); / / / / Remove the status bar, and display their own program name / / GetWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, / / WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView (R.layout.pictureshow); The ImageList the getSD (); list = ImageList.toArray (new String [ImageList.size ()]); / * Set the Switcher * / mSwitcher = (ImageSwitcher) findViewById (R.id.switcher); mSwitcher.setFactory (this); / * Set the load Switcher mode * / mSwitcher.setInAnimation (AnimationUtils.loadAnimation (this, android.R.anim.fade_in)); / * Set output Switcher mode * / mSwitcher.setOutAnimation (AnimationUtils.loadAnimation (this, android.R.anim.fade_out)); mSwitcher.setOnClickListener (new OnClickListener () { public void onClick (View v) the { Toast.makeText (BgPictureShowActivity.this, “click”, Toast.LENGTH_SHORT). The show (); } }); Gallery g = (Gallery) findViewById (R.id.mygallery); / * Add several ImageAdapter to and set to the Gallery object * / g.setAdapter (new ImageAdapter (this, getSD ())); g.setOnItemSelectedListener (this); / * Set a itemclickListener event * / g.setOnItemClickListener (new OnItemClickListener () { public void the onItemClick (AdapterView, which &lt;?&gt; parent, View v, int position, long id) { Toast.makeText (BgPictureShowActivity.this, “dianjiale”, Toast.LENGTH_SHORT). Show (); } }); } private List &lt;String&gt; getSD () { / * Set the current path * / The the List &lt;String&gt; it = the new ArrayList &lt;String&gt; (); File f = new File (“/ sdcard /”); File [] files = f.listFiles (); / * All the files stored in the ArrayList * / for (int i = 0; i &lt;files.length; i + +) { The File the file = files [i]; if (getImageFile (file.getPath ())) it.add (file.getPath ()); } return it; } private boolean getImageFile (String fName) { a boolean the re; / * Get the extension * / String end = fName.substring (fName.lastIndexOf (“.”) +1, fName.length ()). toLowerCase (); / * Decided by the type of extension The MimeType * / if (end.equals (“jpg”) | | end.equals (“gif”) | | end.equals (“png”) | | End.equals (“jpeg”) | | end.equals (“bmp”)) { re = true; } else { re = false; } return the re; } / * To rewrite BaseAdapter custom one ImageAdapter class * / public class ImageAdapter the extends BaseAdapter, { / * Declare variables * / int mGalleryItemBackground; private Context mContext; private the List &lt;String&gt; of lis; / * ImageAdapter, constructed character * / the public ImageAdapter (Context c, the List &lt;String&gt; li) { mContext = c; of lis = li; / * Res / values ​​/ attrs.xml &lt;declare-styleable&gt; defined * Gallery attribute * / TypedArray a = obtainStyledAttributes (R.styleable.Gallery); / * Obtain attribute Gallery Index id * / mGalleryItemBackground = a.getResourceId ( R.styleable.Gallery_android_galleryItemBackground, 0); / * Let the object styleable properties can be used repeatedly * / a.recycle (); } / * A few set to rewrite the getCount, the number of returned images * / public int the getCount () { return lis.size (); } / * Must override the method getItem, returns the position * / Public Object getItem (int position) { the return position; } / * Must be rewritten getItemId pass and position * / public long getItemId (int position) { the return position; } / * A few set to rewrite the method getView pass and View objects * / public View getView (int position, View convertView, Of ViewGroup that the parent) { / * Generate the ImageView object * / ImageView i = new ImageView (mContext); / * Set the picture to imageView object * / Bitmap bm = BitmapFactory.decodeFile (lis. get (position). toString ()); i.setImageBitmap (bm); / * Reset the image width and height * / i.setScaleType (ImageView.ScaleType.FIT_XY); / * Reset the Layout of the width and height * / i.setLayoutParams (new Gallery.LayoutParams (136, 88)); / * Set the Gallery background images * / i.setBackgroundResource (mGalleryItemBackground); / * Pass back to imageView object * / return i; } } public void onItemSelected (AdapterView &lt;?&gt; parent, View view, int position, long id) { The string photoURL = list [position]; Log.i (“A”, String.valueOf (position)); mSwitcher.setImageURI (Uri.parse (photoURL)); } public void onNothingSelected (AdapterView &lt;?&gt; parent) { / / TODO Auto-generated method the stub } public View makeView () { ImageView i = new ImageView (this); i.setBackgroundColor (0xFF000000); i.setScaleType (ImageView.ScaleType.FIT_CENTER); i.setLayoutParams (new ImageSwitcher.LayoutParams ( LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); return i; } } </code></pre> <p>This code is very long, to see will certainly be a headache plus DAN pain, but to hold on the MARS God repeatedly warned we in this industry is characterized to be patient. There is a very important thing, in the values ​​file folder, create an xml inside the book:</p> <pre><code>&lt;? Xml version = “1.0″ encoding = “utf-8″?&gt; &lt;resources&gt; &lt;declare-styleable name=”Gallery”&gt; &lt;attr name=”android:galleryItemBackground” /&gt; &lt;/ Declare-styleable &lt;/ Resources&gt; </code></pre> <p><a href="http://developer.aiwgame.com/gallery-show-an-image-from-android-sd-card.html" rel="nofollow">http://developer.aiwgame.com/gallery-show-an-image-from-android-sd-card.html</a></p>
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