Android手機操作系統的應用方式靈活，簡單，深受廣大編程愛好者的喜愛。尤其是它的開源代碼，使得我們能夠方便的得到自己想要的功能需求。今天我們就為大傢帶來瞭有關Android圖片瀏覽的相關方法。
本文來自：安卓航班網www.apkway.com
原文鏈接處：
http://www.apkway.com/forum.php?mod=viewthread&tid=697&extra=
首先是Android圖片瀏覽中layout xml:
java代碼：
Java代碼
[font=宋體]< ?xml version=”1.0″ encoding=”utf-8″?>
< RelativeLayout xmlns:android=”http://schemas.Android.com/apk/res/Android” Android:layout_width=”fill_parent”
Android:layout_height=”fill_parent”>
< ImageSwitcher
Android:id=”@+id/switcher”
Android:layout_width=”fill_parent”
Android:layout_height=”fill_parent”
Android:layout_alignParentTop=”true”
Android:layout_alignParentLeft=”true” />
< Gallery
Android:id=”@+id/gallery”
Android:background=”#55000000″
Android:layout_width=”fill_parent”
Android:layout_height=”60dp”
Android:layout_alignParentBottom=”true”
Android:layout_alignParentLeft=”true”
Android:gravity=”center_vertical”
Android:spacing=”16dp” />
< /RelativeLayout> [/font]
layout裡面用到瞭前面所說的兩個控件，ImageSwitcher用啦顯示全圖，Gallery用來顯示縮略圖。著重看看ImageSwitcher,在ImageSwitcher1中需要實現ViewSwitcher.ViewFactory這個接口，這個接口裡有個方法makeView，這樣就產生瞭用來顯示圖片的view. ImageSwitcher調用過程是這樣的，首先要有一個Factory為它提供一個View，然後ImageSwitcher就可以初始化各種資源瞭。註意在使用一個ImageSwitcher之前，一定要調用setFactory方法，要不setImageResource這個方法會報空指針異常。
下面是Android圖片瀏覽代碼：
java代碼：
Java代碼
[font=宋體]package com.zx.imageswitcher;
import Android.app.Activity;
import Android.content.Context;
import Android.os.Bundle;
import Android.view.View;
import Android.view.ViewGroup;
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.ViewSwitcher;
import Android.widget.Gallery.LayoutParams;
public class ImageSwitcherTest extends Activity implements AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory{
private ImageSwitcher mSwitcher;
private Integer[] mThumbIds = {
R.drawable.sample_thumb_0, R.drawable.sample_thumb_1, R.drawable.sample_thumb_2, R.drawable.sample_thumb_3, R.drawable.sample_thumb_4, R.drawable.sample_thumb_5, R.drawable.sample_thumb_6, R.drawable.sample_thumb_7};
private Integer[] mImageIds = {
R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7};
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
mSwitcher.setFactory(this);
mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, Android.R.anim.fade_in)); mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, Android.R.anim.fade_out));
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this));
g.setOnItemSelectedListener(this);
}
/* * override for ViewSwitcher.ViewFactory#makeView() */
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;
}
/*
* override for
* AdapterView.OnItemSelectedListener#onItemSelected()
*/
public void onItemSelected(AdapterView parent, View v, int position, long id) { mSwitcher.setImageResource(mImageIds[position]);
}
/*
* override for AdapterView.OnItemSelectedListener#onNothingSelected()
*/
public void onNothingSelected(AdapterView< ?> arg0) {
// TODO Auto-generated method stub
}
public class ImageAdapter extends BaseAdapter {
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);
i.setImageResource(mThumbIds[position]);
i.setAdjustViewBounds(true);
i.setLayoutParams(new Gallery.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
i.setBackgroundResource(R.drawable.picture_frame);
return i;
}
private Context mContext;
}
} [/font]