认识使用GalleryImage

最新推荐文章于 2024-05-18 10:01:41 发布

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最新推荐文章于 2024-05-18 10:01:41 发布

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文章标签： Android 应用

本文链接：https://blog.youkuaiyun.com/u010174169/article/details/8914615

本文介绍了一个简单的GalleryImage应用开发过程，该应用通过Gallery组件展示一系列图片，并实现了点击图片时背景随之变化的功能。主要涉及Android环境下自定义适配器、设置图片资源及监听点击事件等关键技术。

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制作如图所示GallerImage应用，当点击图片时，后面的背景也跟随变化

源码：

ImageAdapter.java

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

public class ImageAdapter extends BaseAdapter{
private Context mContext;
Integer[] Mimages={R.drawable.img1,R.drawable.img2,R.drawable.img5,R.drawable.img6,R.drawable.img7};
public ImageAdapter(Context c) {
// TODO Auto-generated constructor stub
mContext=c;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return Mimages.length;
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView imageview=new ImageView(mContext);
imageview.setImageResource(Mimages[position]);
imageview.setLayoutParams(new Gallery.LayoutParams(120, 120));
imageview.setScaleType(ImageView.ScaleType.FIT_END);
return imageview;
}

}

mainActivity.java

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import cn.wang.galleryimage.*;
public class MainActivity extends Activity {
ImageAdapter i=new ImageAdapter(this);

//protected static final int[] Mimages = {};

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

  final Gallery g=(Gallery) findViewById(R.id.ga1);
  g.setAdapter(new ImageAdapter(this));
  g.setBackgroundResource(R.drawable.img5);
  g.setOnItemClickListener(new OnItemClickListener() {

   @Override
   public void onItemClick(AdapterView<?> parent, View v, int position,
     long id) {
    // TODO Auto-generated method stub
    g.setBackgroundResource(i.Mimages[position]);

   }
  });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
}
}

activity_main.xml