点击小图片 放大图片

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#000000"
    android:orientation="vertical" >

    <GridView
        android:id="@+id/gridView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="top"
        android:horizontalSpacing="10dp"
        android:numColumns="2"
        android:stretchMode="columnWidth"
        android:verticalSpacing="10dp" >
    </GridView>

    <ImageView
        android:id="@+id/img"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

 

 

package com.example.ui3;import android.app.Activity;import android.content.Context;import android.os.Bundle;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.GridView;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {// 可以自己设置图片，图片大小不宜过大。Integer[] img = { R.drawable.p1, R.drawable.p2, R.drawable.p3,R.drawable.p4, R.drawable.p5, R.drawable.p6 };private ImageView imgView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);imgView = (ImageView) findViewById(R.id.img);GridView gird = (GridView) findViewById(R.id.gridView1);gird.setAdapter(new ImageAdapter(this));gird.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {imgView.setBackgroundResource(img[arg2]);}});}public class ImageAdapter extends BaseAdapter {public Context context;public ImageAdapter(Context context) {this.context = context;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn img.length;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {// TODO Auto-generated method stubImageView imageView;if (convertView == null) {imageView = new ImageView(context);imageView.setLayoutParams(new GridView.LayoutParams(85, 85));imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);imageView.setPadding(8,8, 8, 8);} else {imageView = (ImageView) convertView;}imageView.setImageResource(img[position]);return imageView;}}@Overridepublic 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;}}