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