Android 之 Gallery

1    在 xml 布局中添加 Gallery

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <Gallery

        android:id="@+id/gallery"

        android:layout_width="match_parent"

        android:layout_height="match_parent"/>

</LinearLayout>

2    自定义 ImageAdapter

ImageAdapter.java

package com.example.gallery;

import java.util.List;

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;

@SuppressWarnings("deprecation")

public class ImageAdapter extends BaseAdapter {

    

    private Context context;

    private List<Integer> list;

    private TypedArray typedArray;

    private int item_background;

    

    public ImageAdapter(Context context ,List<Integer> list)

    {

        this.context=context;

        this.list=list;

        this.typedArray = context.obtainStyledAttributes(R.styleable.gallery_style);

        item_background=typedArray.getResourceId(R.styleable.gallery_style_android_galleryItemBackground, 0);

        typedArray.recycle();

    }

    @Override

    public int getCount() {

        return list.size();

    }

    @Override

    public Object getItem(int position) {

        return position;

    }

    @Override

    public long getItemId(int position) {

        return position;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView imageView = new ImageView(context);

        //设置显示的图片

        imageView.setImageResource(list.get(position));

        

        //设置伸缩规格

        imageView.setScaleType(ImageView.ScaleType.FIT_XY);

        

        //设置布局参数

        imageView.setLayoutParams(new Gallery.LayoutParams(150,100));

        

        //设置背景边框

        imageView.setBackgroundResource(item_background);

        

        return imageView;

    }

}

3    每个 ImageView 的背景参数

res/values/attrs.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="gallery_style">

        <attr name="android:galleryItemBackground" />

    </declare-styleable>

</resources>

4    在 MainActivity 中绑定数据与设置监听

MainActivity.java

package com.example.gallery;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.Gallery;

import android.widget.Toast;

@SuppressWarnings("deprecation")

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Gallery gallery=(Gallery)findViewById(R.id.gallery);

        

        ArrayList<Integer>list=new ArrayList<Integer>();

        list.add(R.drawable.img1);

        list.add(R.drawable.img2);

        list.add(R.drawable.img3);

        list.add(R.drawable.img4);

        list.add(R.drawable.img5);

        list.add(R.drawable.img6);

        list.add(R.drawable.img7);

        

        ImageAdapter adapter=new ImageAdapter(this,list);

        gallery.setAdapter(adapter);

        

        gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {  

            @Override  

            public void onItemSelected(AdapterView<?> parent, View v,int position, long id) {  

                Toast.makeText(getApplicationContext(), "选择了:  "+ 

                               String.valueOf(position), Toast.LENGTH_SHORT).show();

            }  

            

            @Override  

            public void onNothingSelected(AdapterView<?> arg0) {  

            //这里不做响应  

            }  

        }); 

    }

}

5    图片资源

注：图片最好为 png 格式的图片，由于jpg是压缩后的图片，在android 中解压缩有可能导致内存溢出错误。

 

6    结果展示

 

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