安卓——gallery&&ImageSwitcher制作图片浏览器

mainactivity.xml<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.lenovo.glleryimageswitcher.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>
MainActivity.javapackage com.example.lenovo.glleryimageswitcher;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.Gallery;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;

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

//数据源
private int[] res=
{
R.drawable.item1,
R.drawable.item2,
R.drawable.item3,
R.drawable.item4,
R.drawable.item5,
R.drawable.item6,
R.drawable.item7,
R.drawable.item8,
R.drawable.item9,
R.drawable.item10,
R.drawable.item11,
R.drawable.item12,
};
private Gallery gallery;
private ImageAdapter adapter;
private ImageSwitcher imageSwitcher;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

gallery=(Gallery)findViewById(R.id.gallery);
imageSwitcher=(ImageSwitcher)findViewById(R.id.is);
adapter=new ImageAdapter(res,MainActivity.this);

gallery.setAdapter(adapter);

gallery.setOnItemSelectedListener(this);

imageSwitcher.setFactory(this);

}

@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {

// imageView.setBackgroundResource(res[i%res.length]);
imageSwitcher.setBackgroundResource(res[i%res.length]);

}

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

}

@Override
public View makeView() {
ImageView imageView=new ImageView(this);
imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
return imageView;
}
}
ImageAdapter.javapackage com.example.lenovo.glleryimageswitcher;

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

/**
* Created by lenovo on 2018/3/11.
*/

public class ImageAdapter extends BaseAdapter {

private int res[];
private Context context;

public ImageAdapter(int res[], Context context){
this.context=context;
this.res=res;
}
@Override
public int getCount() {
return Integer.MAX_VALUE;
}

@Override
public Object getItem(int i) {
return res[i];
}

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

@Override
public View getView(int i, View view, ViewGroup viewGroup) {

Log.i("Main","position="+i+"res[i%res.length]="+i%res.length);
ImageView imageView=new ImageView(context);
imageView.setBackgroundResource(res[i%res.length]);
//设置缩略图的大小
imageView.setLayoutParams(new Gallery.LayoutParams(400,300));
//设置缩放模式，横向的XY轴进行拉伸
imageView.setScaleType(ImageView.ScaleType.FIT_XY);

return imageView;
}
}