GridViewDemo

GridViewDemo:网格示例

GridView标签内定义列宽，android:columnWidth="120dp"。

getView()内定义每一个ImageView的大小(115, 115)，setScaleType设置图片显示的方式。

imageView.setLayoutParams(new GridView.LayoutParams(115, 115)); 
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);

 package com.example.shad_fnst.gridviewdemo;

 import android.app.Activity;
 import android.support.v7.app.ActionBarActivity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.widget.GridView;

 public class MainActivity extends Activity {

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

         GridView gridView = (GridView) findViewById(R.id.gridview);
         gridView.setAdapter(new ImageAdapter(this));
     }

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

     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         // Handle action bar item clicks here. The action bar will
         // automatically handle clicks on the Home/Up button, so long
         // as you specify a parent activity in AndroidManifest.xml.
         int id = item.getItemId();

         //noinspection SimplifiableIfStatement
         if (id == R.id.action_settings) {
             return true;
         }

         return super.onOptionsItemSelected(item);
     }
 }

MainActivity.java

 package com.example.shad_fnst.gridviewdemo;

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

 import java.util.Objects;

 /**
  * Created by shad-fnst on 2015/08/04.
  */
 public class ImageAdapter extends BaseAdapter {
     private Context mContext;

     //keep all Images in array
     public Integer[] mThumbIds = {
             R.drawable.sample2, R.drawable.sample3,
             R.drawable.sample4, R.drawable.sample5,
             R.drawable.sample6, R.drawable.sample7,
             R.drawable.sample0, R.drawable.sample1,
             R.drawable.sample2, R.drawable.sample3,
             R.drawable.sample4, R.drawable.sample5,
             R.drawable.sample6, R.drawable.sample7,
             R.drawable.sample0, R.drawable.sample1,
             R.drawable.sample2, R.drawable.sample3,
             R.drawable.sample4, R.drawable.sample5,
             R.drawable.sample6, R.drawable.sample7,
     };

     //Constructor
     public ImageAdapter(Context context){
         mContext = context;
     }

     public int getCount(){
         return mThumbIds.length;
     }

     public Object getItem(int position){
         return null;
     }

     public long getItemId(int position){
         return  0;
     }

     //create a new ImageView for each item referenced by the Adapter
     public View getView(int position, View convertView, ViewGroup parent){
         ImageView imageView;
         if(convertView == null){
             imageView = new ImageView(mContext);
             imageView.setLayoutParams(new GridView.LayoutParams(115, 115));
             imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
             imageView.setPadding(8, 8, 8, 8);
         }else{
             imageView =(ImageView) convertView;
         }

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

ImageAdapter.java

 <?xml version="1.0" encoding="utf-8"?>
 <GridView xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:id="@+id/gridview"
     android:columnWidth="120dp"
     android:numColumns="auto_fit"
     android:verticalSpacing="10dp"
     android:horizontalSpacing="10dp"
     android:stretchMode="columnWidth"
     android:gravity="center">
 </GridView>

activity_main.xml