先定义xml
<? Xml version = “1.0″ encoding = “utf-8″?>
<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”
>
<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”
/>
< 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”
/>
</ RelativeLayout>
两个。自定义显示中的活动
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 <String> 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 <?> parent,
View v, int position, long id)
{
Toast.makeText (BgPictureShowActivity.this, “dianjiale”, Toast.LENGTH_SHORT). Show ();
}
});
}
private List <String> getSD ()
{
/ * Set the current path * /
The the List <String> it = the new ArrayList <String> ();
File f = new File (“/ sdcard /”);
File [] files = f.listFiles ();
/ * All the files stored in the ArrayList * /
for (int i = 0; i <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 <String> of lis;
/ * ImageAdapter, constructed character * /
the public ImageAdapter (Context c, the List <String> li)
{
mContext = c;
of lis = li;
/ * Res / values / attrs.xml <declare-styleable> 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 <?> 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 <?> 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;
}
}
这段代码很长，看到肯定会头疼加DAN疼，但是要坚持住MARS大神一再告诫我们这个行业的特点是要有耐心。
有一个很重要的东西，在values文件夹中，在书里面创建一个xml：
<? Xml version = “1.0″ encoding = “utf-8″?>
<resources>
<declare-styleable name=”Gallery”>
<attr name=”android:galleryItemBackground” />
</ Declare-styleable
</ Resources>
http://developer.aiwgame.com/gallery-show-an-image-from-android-sd-card.html