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基本视图——GridView

作者：追风剑情 发布于：2015-9-22 21:02 分类：Android

视图

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    tools:context="${relativePackage}.${activityClass}" >

    <GridView
        android:id="@+id/gridview"
        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" />

</LinearLayout>

代码

package com.example.androidtest;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class GridActivity extends Activity {

	Integer[] imageIDs = {
			R.drawable.pic1,
			R.drawable.pic2,
			R.drawable.pic3,
			R.drawable.pic4,
			R.drawable.pic5,
			R.drawable.pic6,
			R.drawable.pic7
		};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_grid);
		
		GridView gridView = (GridView) findViewById(R.id.gridview);
		gridView.setAdapter(new ImageAdapter(this));
		
		gridView.setOnItemClickListener(new OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Toast.makeText(getBaseContext(), "pic"+(position+1)+" selected",
						Toast.LENGTH_SHORT).show();
			}
			
		});
	}
	
	public class ImageAdapter extends BaseAdapter
	{
		Context context;
		int itemBackground;
		
		public ImageAdapter(Context c)
		{
			context = c;
		}

		@Override
		public int getCount() {
			return imageIDs.length;
		}

		@Override
		public Object getItem(int position) {
			return position;
		}

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

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ImageView imageView;
			if(convertView == null) {
				imageView = new ImageView(context);
				imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
				imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
				imageView.setPadding(5, 5, 5, 5);//设置内边距
			}else{
				imageView = (ImageView) convertView;
			}
			imageView.setImageResource(imageIDs[position]);
			return imageView;
		}
		
	}
}

运行效果

标签: Android