android GridView(网格视图）

最新推荐文章于 2024-04-16 16:34:52 发布

suzicyt

最新推荐文章于 2024-04-16 16:34:52 发布

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分类专栏： android 学习日记（UI) 文章标签： android 网格 import layout integer encoding

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本文介绍了一个使用Android中的GridView组件展示图片的应用实例。通过自定义ImageAdapter类来填充GridView，并实现点击图片后的反馈效果。

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GridView01.java:

package com.GridView01;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.view.View;

public class GridView01 extends Activity {
GridView mGridView;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mGridView=(GridView)findViewById(R.id.mGridView);

        //添加元素给mGridView
        mGridView.setAdapter(new ImageAdapter(this));

        mGridView.setBackgroundColor(Color.WHITE);

        mGridView.setOnItemClickListener(new OnItemClickListener()
        {
        public void onItemClick(AdapterView<?>parent,View v,int position,long id)
        {
          Toast.makeText(GridView01.this, "you chose"+(position=1), Toast.LENGTH_SHORT).show();
        }
        });


    }
}

ImageAdapter.java:

package com.GridView01;

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

public class ImageAdapter extends BaseAdapter
{
// 定义Context
private Context  mContext;
// 定义整型数组即图片源
private Integer[] mImageIds =
{
   R.drawable.img1,
   R.drawable.img2,
   R.drawable.img3,
   R.drawable.img4,
   R.drawable.img5,
   R.drawable.img6,
   R.drawable.img7,
   R.drawable.img8,
   R.drawable.img1,
};

public ImageAdapter(Context c)
{
mContext = c;
}

// 获取图片的个数
public int getCount()
{
return mImageIds.length;
}

// 获取图片在库中的位置
public Object getItem(int position)
{
return position;
}

// 获取图片ID
public long getItemId(int position)
{
return position;
}

public View getView(int position, View convertView, ViewGroup parent)
{
  ImageView imageView;
  if (convertView == null)
  {
   // 给ImageView设置资源
   imageView = new ImageView(mContext);
   // 设置布局图片120×120显示
   imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
   // 设置显示比例类型
   imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);
  }
  else
  {
   imageView = (ImageView) convertView;
  }

imageView.setImageResource(mImageIds[position]);
return imageView;
}

}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mGridView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:columnWidth="90dp"
android:stretchMode="columnWidth"
android:gravity="center"
/>