安卓实战-照片浏览器

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<ScrollView
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="400dip">
    <ImageSwitcher
        android:id="@+id/switcher"
        android:layout_width="fill_parent"
        android:layout_height="400dip"
        android:text="Hello World!"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:paddingTop="60dp"/>
</ScrollView>

    <Gallery
        android:id="@+id/gallery"
        android:layout_width="fill_parent"
        android:layout_height="80dip"
        android:gravity="center_vertical"
        android:spacing="3dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />


</RelativeLayout>
数据适配器 

package com.example.a14468.imageswitchergallery;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;

/**
 * Created by 14468 on 2017/4/20.
 * 设置一个数据适配器，数据适配器由创建一个imageAdapter对象来生成显示图片
 */

public class ImageAdapter extends BaseAdapter {

    private Context mContext;//创建本Activity的上下文对象
    private Integer[] mImageIds;//图片资源

    public ImageAdapter(Context c,Integer[] m){
        this.mContext = c;
        this.mImageIds = m;
    }

    @Override
    public int getCount() {
        return mImageIds.length;
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    /**
     * 显示Gallery里的模式
     * @param position
     * @param convertView
     * @param parent
     * @return
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView i = new ImageView((mContext));
        i.setImageResource(mImageIds[position]);//设置控件显示的图片
        i.setAdjustViewBounds(true);//保持图片的纵横比例
        i.setLayoutParams(new Gallery.LayoutParams(80,70));//设置ImageView 的宽高参数
        return i;
    }
}
MainActivity

package com.example.a14468.imageswitchergallery;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;

import java.io.InputStream;

public class MainActivity extends AppCompatActivity implements ViewSwitcher.ViewFactory {

    protected static InputStream is;
    private ImageSwitcher mSwitcher;
    /*设定在Gallery的图片*/
    //创建整形数组来存放图片资源
    private Integer[] mImageIds = {
            R.mipmap.ic_launcher,R.mipmap.icon, R.mipmap.ftp,
            R.mipmap.ic_launcher,R.mipmap.ic_launcher_round, R.mipmap.icon,
            R.mipmap.ic_launcher,R.mipmap.ic_launcher_round, R.mipmap.ic_launcher
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /*设定Switcher*/
        mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
        mSwitcher.setFactory(this);

        mSwitcher.setImageResource(mImageIds[0]);
        Gallery g = (Gallery) findViewById(R.id.gallery);
        g.setAdapter(new ImageAdapter(MainActivity.this,mImageIds));
        g.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                mSwitcher.setImageResource(mImageIds[position]);
            }
        });
    }

    /*Switcher的模式*/

    @Override
    public View makeView() {
        ImageView i = new ImageView(this);
        i.setBackgroundColor(0xFF000000);
        i.setScaleType(ImageView.ScaleType.FIT_CENTER);
        i.setLayoutParams(new ImageSwitcher.LayoutParams(480,400));
        return i;
    }
}