Gallery的简单功能和用法（画廊视图）

2023-03-13 18:33| 来源: 网络整理| 查看: 265

Gallery常用属性这里写图片描述布局文件一个简单的案例，幻灯片式的预览图片画廊展示，点击图片则ImageView大图展示

代码实现

package com.test.gallery;import android.app.Activity;import android.content.res.TypedArray;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemSelectedListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class MainActivity extends Activity { private Gallery gallery; private ImageView imageview; int [] imageIds = new int[]{ R.drawable.abc_btn_check_to_on_mtrl_000, R.drawable.abc_btn_check_to_on_mtrl_015, R.drawable.abc_btn_radio_to_on_mtrl_000, R.drawable.abc_btn_radio_to_on_mtrl_015, R.drawable.abc_btn_rating_star_off_mtrl_alpha, R.drawable.abc_btn_rating_star_on_mtrl_alpha }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //找到控件 gallery = (Gallery)findViewById(R.id.gallary); imageview = (ImageView)findViewById(R.id.imageview); //创建BaseAdapter适配器，该对象负责为Gallery提供所显示的列表项 BaseAdapter adapter = new BaseAdapter() { @Override public View getView(int position, View convertView, ViewGroup parent) { //创建需要返回的imageview ImageView imageview = new ImageView(MainActivity.this); imageview.setImageResource(imageIds[position]); //设置imageview的缩放类型 imageview.setScaleType(ImageView.ScaleType.FIT_XY); //为imageview设置布局参数 imageview.setLayoutParams(new Gallery.LayoutParams(75,100)); TypedArray typedArray = obtainStyledAttributes (R.styleable.Gallery); imageview.setBackgroundResource(typedArray.getResourceId (R.styleable.Gallery_android_galleryItemBackground, 0)); return imageview; } @Override public long getItemId(int position) { return position; } @Override public Object getItem(int position) { return position; } @Override public int getCount() { return imageIds.length; } }; gallery.setAdapter(adapter); gallery.setOnItemSelectedListener(new OnItemSelectedListener() { //当Gallery选中项目发生改变时，触发该方法。图片显示为选中的列表项 @Override public void onItemSelected(AdapterView parent, View view, int position, long id) { imageview.setImageResource(imageIds[position]); } @Override public void onNothingSelected(AdapterView parent) { } }); }}

android其实已经不再推荐使用Gallery组件了，而是推荐其他的水平滚动组件，如HorizontalScrollView和ViewPager来代替Gallery组件，因此在新版本的android中应该少用Gallery组件

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