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Android中Gallery跟ImageSwitcher的使用

热度:557   发布时间:2016-05-13 02:27:01
Android中Gallery和ImageSwitcher的使用

效果如下:
这里写图片描述

布局文件activity_main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ImageSwitcher        android:id="@+id/imageSwitcher"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_weight="2"        android:paddingTop="30px" >    </ImageSwitcher>    <Gallery        android:id="@+id/gallery1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_weight="1"        android:spacing="5px"        android:unselectedAlpha="0.6" /></RelativeLayout>

MainActivity.java代码如下:

import android.app.ActionBar.LayoutParams;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.animation.AnimationUtils;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.Gallery;import android.widget.ImageSwitcher;import android.widget.ImageView;import android.widget.ViewSwitcher.ViewFactory;public class MainActivity extends Activity {    private int imageId[] = new int[] { R.drawable.a, R.drawable.b,            R.drawable.c, R.drawable.d, R.drawable.e, R.drawable.f,            R.drawable.g, R.drawable.h, R.drawable.i, R.drawable.j,            R.drawable.k };    private ImageSwitcher imageSwitcher;    private Gallery gallery;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        imageSwitcher = (ImageSwitcher) this.findViewById(R.id.imageSwitcher);        gallery = (Gallery) this.findViewById(R.id.gallery1);        // 设置动画效果        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,                android.R.anim.fade_in));        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,                android.R.anim.fade_out));        imageSwitcher.setFactory(new ViewFactory() {            @Override            public View makeView() {                ImageView imageView = new ImageView(MainActivity.this);                imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); // 设置保持纵横比居中                imageView.setLayoutParams(new ImageSwitcher.LayoutParams(                        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));                return imageView;            }        });        GalleryAdapter adapter = new GalleryAdapter(MainActivity.this,imageId);        gallery.setAdapter(adapter);        gallery.setSelection(imageId.length / 2);        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView<?> parent, View view,int position, long id) {                imageSwitcher.setImageResource(imageId[position]);            }            @Override            public void onNothingSelected(AdapterView<?> arg0) {            }        });    }}

其中需要的一个适配器:

import android.content.Context;import android.content.res.TypedArray;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class GalleryAdapter extends BaseAdapter {    private int[] imageId;    private Context mContext;    /**     * 穿入上下文和图片资源数组     * @param mContext     * @param imageId     */    public GalleryAdapter(Context mContext, int[] imageId) {        this.mContext = mContext;        this.imageId = imageId;    }    @Override    public int getCount() {        return imageId.length;    }    @Override    public Object getItem(int position) {        return imageId[position];    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ImageView imageView1;        if (convertView == null) {            imageView1 = new ImageView(mContext);            imageView1.setScaleType(ImageView.ScaleType.FIT_XY);            imageView1.setLayoutParams(new Gallery.LayoutParams(180, 135));            TypedArray typedArray = mContext                    .obtainStyledAttributes(R.styleable.Gallery);            imageView1.setBackgroundResource(typedArray.getResourceId(                    R.styleable.Gallery_android_galleryItemBackground, 0));            imageView1.setPadding(5, 0, 5, 0); // 设置ImageView的内边距        } else {            imageView1 = (ImageView) convertView;        }        imageView1.setImageResource(imageId[position]); // 为ImageView设置要显示的图片        return imageView1; // 返回ImageView    }}

到此 OK!

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