android横向浏览图片,Android使用gallery和imageSwitch制作可左右循环滑动的图片浏览器...

效果图：

为了使图片浏览器左右无限循环滑动 我们要自定义gallery的adapter

如果要想自定义adapter首先要了解这几个方法

@Override

public int getCount() {

// TODO Auto-generated method stub

return 0;

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return null;

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return 0;

}

@Override

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

// TODO Auto-generated method stub

return null;

}

其中getCount方法 是返回数据源的数量

getItem方法 返回的是一个object对象 也就是返回目前容器中数据ID position所对应的对象

getItemId 返回目前容器中的数据ID

getView取得目前要显示的View

如果要实现左右循环滑动 首先我们要返回数据源的数量为最大值 然后把所有数据的ID对原本数据源的数量取余  最后设置gallery初始的位置在0-最大值的中间即可

更改后的adapter就是这样

package com.example.imageswitcher;

import android.content.Context;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.Gallery;

import android.widget.ImageView;

import android.widget.ImageView.ScaleType;

public class MyAdapter extends BaseAdapter{

private int id_image[];

private Context contex;

public MyAdapter(Context contex,int id_image[]) {

this.contex=contex;

this.id_image=id_image;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return Integer.MAX_VALUE;

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return id_image[position%id_image.length];

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position%id_image.length;

}

@Override

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

// TODO Auto-generated method stub

ImageView imageView=new ImageView(contex);

imageView.setBackgroundResource(id_image[position%id_image.length]);

imageView.setLayoutParams(new Gallery.LayoutParams(250, 200));

imageView.setScaleType(ScaleType.FIT_XY);

return imageView;

}

}

MainActivity

package com.example.imageswitcher;

import android.os.Bundle;

import android.app.Activity;

import android.view.LayoutInflater.Factory;

import android.view.Menu;

import android.view.View;

import android.view.Window;

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.ImageView.ScaleType;

import android.widget.ViewSwitcher.ViewFactory;

public class MainActivity extends Activity implements OnItemSelectedListener,ViewFactory{

private ImageSwitcher imageSwitcher;

private Gallery gallery;

private int id_image[] = { R.drawable.beauty1, R.drawable.beauty2,

R.drawable.beauty3, R.drawable.beauty4, R.drawable.beauty5,

R.drawable.beauty6, R.drawable.beauty7, R.drawable.beauty8,

R.drawable.beauty9};

private MyAdapter myAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.activity_main);

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

imageSwitcher = (ImageSwitcher) findViewById(R.id.id_imageSwitcher);

myAdapter=new MyAdapter(this, id_image);

imageSwitcher.setFactory(this);

gallery.setOnItemSelectedListener(this);

//设置淡入淡出效果

imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));

imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));

gallery.setAdapter(myAdapter);

//一定不要忘记 设置gallery的初始位置为中间即可

gallery.setSelection(id_image.length*100);

}

@Override

public void onItemSelected(AdapterView> parent, View view, int position,

long id) {

// TODO Auto-generated method stub

imageSwitcher.setBackgroundResource(id_image[position%id_image.length]);

}

@Override

public void onNothingSelected(AdapterView> parent) {

// TODO Auto-generated method stub

}

@Override

public View makeView() {

// TODO Auto-generated method stub

ImageView image=new ImageView(this);

image.setScaleType(ScaleType.FIT_CENTER);

return image;

}

}

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