Gallery==>画廊视图
Gallery和Spinnery父类相同——AbsSpinner,表明Garrey和Spinner都是一个列表框。
两者之间的区别是:Spinner显示的是一个垂直列表框,Gallery显示的是一个水平列表框;
Spinner的作用是供用户选择,而Gallery则允许用户通过拖动来查看上一个、下一个列表项。
Garrey常用XML属性:
android:animationDuration | setAnimationDuration(int) | 设置列表项切换时的动画帧持续时间 |
android:gravity | setGravity(int) | 设置对其方式 |
android:spacing | setSpacing(int) | 设置Gallery内列表项之间的间距 |
android: unselectedAlpha | setUnselectedAlpha(float) | 设置没有选中的列表项的透明度 |
注意:
Gallery用法类似Spinner,使用Adapter提供数据源,Adapter的getView()所返回的View将作为Gallery列表的列表项;
通过OnItemSelectedListener监听器监听选择项的改变。
实例一
布局文件==》 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <ImageSwitcher android:id="@+id/switcher" android:layout_width="320dp" android:layout_height="320dp" /> <Gallery android:id="@+id/gallery" android:layout_width="match_parent" android:layout_height="wrap_content" android:spacing="3pt" android:unselectedAlpha="0.6" /> </LinearLayout> 代码实现==》 package com.example.mygrallery; import android.os.Bundle; import android.annotation.SuppressLint; import android.app.Activity; import android.app.ActionBar.LayoutParams; import android.content.res.TypedArray; import android.view.Menu; import android.view.View; import android.view.ViewGroup; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageSwitcher; import android.widget.ImageView; import android.widget.ViewSwitcher.ViewFactory; @SuppressWarnings("deprecation") @SuppressLint("InlinedApi") public class MainActivity extends Activity { private int[] ImageIds = new int[] { R.drawable.one, R.drawable.tw, R.drawable.th, R.drawable.eight, R.drawable.ele, R.drawable.five, R.drawable.four, R.drawable.nice, R.drawable.seven, R.drawable.six, R.drawable.sl, R.drawable.ss, R.drawable.sw, R.drawable.ten, R.drawable.tw, R.drawable.oneowne }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final ImageSwitcher switcher = (ImageSwitcher) this.findViewById(R.id.switcher); final Gallery gallery = (Gallery) this.findViewById(R.id.gallery); switcher.setFactory(new ViewFactory() { @Override public View makeView() { ImageView img = new ImageView(MainActivity.this); img.setBackgroundColor(0xff0000); img.setScaleType(ImageView.ScaleType.FIT_CENTER); img.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); return img; } }); // 设置图片更换的动画效果 switcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in)); switcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out)); // 创建DataAdapter对象,为gallery提供数据 BaseAdapter adapter = new BaseAdapter() { @Override public int getCount() { // TODO Auto-generated method stub return ImageIds.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView img = new ImageView(MainActivity.this); img.setImageResource(ImageIds[position % ImageIds.length]); // 设置ImageView的缩放类型 img.setScaleType(ImageView.ScaleType.FIT_XY); img.setLayoutParams(new Gallery.LayoutParams(75, 110)); // TypedArray arr= obtainStyledAttributes(R.) // img.setBackgroundResource(resid); return img; } }; gallery.setAdapter(adapter); gallery.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { // TODO Auto-generated method stub switcher.setImageResource(ImageIds[position % ImageIds.length]); } @Override public void onNothingSelected(AdapterView<?> parent) { // TODO Auto-generated method stub } }); } @Override public 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; } }
实现效果如下:
时间: 2024-10-05 03:46:33