使用Gallery和ImageSwitcher制作图片浏览器

代码

package com.example.gallery_imageviewswitcher;

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

import butterknife.Bind;
import butterknife.ButterKnife;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener, ViewSwitcher.ViewFactory {

@Bind(R.id.gallery)
Gallery gallery;
@Bind(R.id.activity_main)
RelativeLayout activityMain;
@Bind(R.id.is)
ImageSwitcher is;

private int[] res = {R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher, R.mipmap.ic_launcher};
private ImageAdapter imageAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.bind(this);
imageAdapter = new ImageAdapter(res, this);
gallery.setAdapter(imageAdapter);
gallery.setOnItemSelectedListener(this);
is.setFactory(this);
is.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));
is.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));

}

@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// imageView.setBackgroundResource(mData[position%mData.length]);
is.setBackgroundResource(res[position%res.length]);

}

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

}

@Override
public View makeView() {
ImageView iv=new ImageView(this);
//等比列缩放并且居中
iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
return iv;
}
}


布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"

tools:context="com.example.gallery_imageviewswitcher.MainActivity">

<Gallery
android:id="@+id/gallery"
android:layout_width="match_parent"

android:layout_height="wrap_content" />

<ImageSwitcher
android:id="@+id/is"
android:layout_width="match_parent"
android:layout_height="wrap_content"></ImageSwitcher>
</LinearLayout>


adapter

package com.example.gallery_imageviewswitcher;

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

/**
* Name: ImageAdapter
* Action:
* Author: liuan
* creatTime:2017-06-25 23:58
*/

public class ImageAdapter extends BaseAdapter{

private final int[] mData;
private Context content;

public ImageAdapter(int []res, Context content) {
mData =res;
this.content=content;
}

@Override
public int getCount() {
return Integer.MAX_VALUE;
}
//告诉适配器 取得目前容器中 数据id 和对象
@Override
public Object getItem(int position) {
return mData[position];
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView=new ImageView(content);
imageView.setBackgroundResource(mData[position%mData.length]);
imageView.setLayoutParams(new Gallery.LayoutParams(400,300));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
return imageView;
}
}