本篇文章為大家展示了Android中怎么實(shí)現(xiàn)圖片瀏覽，內(nèi)容簡明扼要并且容易理解，絕對(duì)能使你眼前一亮，通過這篇文章的詳細(xì)介紹希望你能有所收獲。
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首先是Android圖片瀏覽中l(wèi)ayout xml:
< ?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>
layout里面用到了前面所說的兩個(gè)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(shí)現(xiàn)ViewSwitcher.ViewFactory這個(gè)接口，這個(gè)接口里有個(gè)方法makeView，這樣就產(chǎn)生了用來顯示圖片的view. ImageSwitcher調(diào)用過程是這樣的，首先要有一個(gè)Factory為它提供一個(gè)View，然后ImageSwitcher就可以初始化各種資源了。注意在使用一個(gè)ImageSwitcher之前，一定要調(diào)用setFactory方法，要不setImageResource這個(gè)方法會(huì)報(bào)空指針異常。
下面是Android圖片瀏覽代碼：
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;
}
}
從Android圖片瀏覽的代碼中看到還實(shí)現(xiàn)了AdapterView.OnItemSelectedListener，這樣就需要重寫onItemSelected()方法，然后在該方法中：mSwitcher.setImageResource(mImageIds[position]);這樣就實(shí)現(xiàn)了圖片在ImageSwitcher中的切換。
上述內(nèi)容就是Android中怎么實(shí)現(xiàn)圖片瀏覽，你們學(xué)到知識(shí)或技能了嗎？如果還想學(xué)到更多技能或者豐富自己的知識(shí)儲(chǔ)備，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
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