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《Android应用开发详解》- Chapter04_UI_gallery – 画廊视图

Gallery画廊视图一般用来浏览图片,可以响应事件来进行特定内容的显示,如左右滑动来浏览不同的图片。

1. 布局文件main.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>

2. MainActivity.java

package com.amaker.test;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
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.AdapterView.OnItemSelectedListener;
import android.widget.Gallery.LayoutParams;
import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity implements OnItemSelectedListener,
		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 };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		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);

	}

	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;
	}

	@Override
	public void onItemSelected(AdapterView<?> adapter, View v, int position,
			long id) {
		mSwitcher.setImageResource(mImageIds[position]);
	}

	@Override
	public void onNothingSelected(AdapterView<?> arg0) {

	}

	@Override
	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;
	}
}

3. 运行结果

Chapter04_UI_gallary-1

Chapter04_UI_gallary-2

Chapter04_UI_gallary-3

Chapter04_UI_gallery实例源码:

Chapter04_UI_gallery
标题: Chapter04_UI_gallery (723 次点击)
文件: Chapter04_UI_gallery.7z
大小: 268 kB
描述:

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