今天学习的是GridView组件,利用的部分只是还是Adapter、imageView的知识,制作了简单图片浏览器
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical" > <!-- 定义一个GridView组件 --> <GridView android:id="@+id/gridView1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:horizontalSpacing="1pt" android:numColumns="4" android:verticalSpacing="1pt" /> <!-- 定义一个imageView组件 --> <ImageView android:id="@+id/imageView" android:layout_width="240dp" android:layout_height="240dp" android:layout_gravity="center_horizontal" /> </LinearLayout>
<?xml version="1.0" encoding="UTF-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center_horizontal" android:padding="2pt" > <ImageView android:id="@+id/image1" android:layout_width="50dp" android:layout_height="50dp" /> </LinearLayout>
package com.example.gridview; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.GridView; import android.widget.ImageView; import android.widget.SimpleAdapter; public class MainActivity extends Activity { GridView grid; ImageView imageView; int[] imageIds=new int[]{ R.drawable.bomb5,R.drawable.bomb6,R.drawable.bomb7,R.drawable.bomb8, R.drawable.bomb9,R.drawable.bomb10,R.drawable.bomb11,R.drawable.bomb12, R.drawable.bomb13,R.drawable.bomb14,R.drawable.bomb15,R.drawable.bomb16 }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //创建一个List对象,List对象元素师Map List<Map<String,Object>> listItems=new ArrayList<Map<String,Object>>(); for(int i=0;i<imageIds.length;i++){ Map<String,Object> listItem=new HashMap<String,Object>(); listItem.put("image", imageIds[i]); listItems.add(listItem); } imageView=(ImageView) findViewById(R.id.imageView); SimpleAdapter simpleAdapter=new SimpleAdapter(this,listItems,R.layout.cell, new String[]{"image"}, new int[]{R.id.image1}); grid=(GridView) findViewById(R.id.gridView1); grid.setAdapter(simpleAdapter); grid.setOnItemSelectedListener(new OnItemSelectedListener(){ @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { imageView.setImageResource(imageIds[position]); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); grid.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { imageView.setImageResource(imageIds[position]); } }); } }
这个图片浏览器,确实很基本。只是利用事件监听,将gridView里面的图片显示在imageview里,进而显示出图片浏览器效果。