android學習筆記15——Galley

標籤：

Gallery==>畫廊視圖

Gallery和Spinnery父類相同——AbsSpinner,表明Garrey和Spinner都是一個列表框。

兩者之間的區別是：Spinner顯示的是一個垂直列表框，Gallery顯示的是一個水平列表框；

　　　　　　　　   Spinner的作用是供使用者選擇，而Gallery則允許使用者通過拖動來查看上一個、下一個清單項目。

Garrey常用XML屬性：

android:animationDuration	setAnimationDuration(int)	設定清單項目切換時的動畫幀期間
android:gravity	setGravity(int)	設定對其方式
android:spacing	setSpacing(int)	設定Gallery內清單項目之間的間距
android: unselectedAlpha	setUnselectedAlpha(float)	設定沒有選中的清單項目的透明度

 

 

 

注意:

Gallery用法類似Spinner，使用Adapter提供資料來源，Adapter的getView()所返回的View將作為Gallery列表的清單項目；

通過OnItemSelectedListener監聽器監聽選擇項的改變。

執行個體一

布局檔案==》<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>代碼實現==》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 };@Overrideprotected 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(){@Overridepublic 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;}});// 設定圖片更換的動畫效果switcher.setInAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_in));switcher.setOutAnimation(AnimationUtils.loadAnimation(this, android.R.anim.fade_out));// 建立DataAdapter對象,為gallery提供資料BaseAdapter adapter = new BaseAdapter(){@Overridepublic int getCount(){// TODO Auto-generated method stubreturn ImageIds.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){ImageView img = new ImageView(MainActivity.this);img.setImageResource(ImageIds[position % ImageIds.length]);// 設定ImageView的縮放類型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(){@Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position, long id){// TODO Auto-generated method stubswitcher.setImageResource(ImageIds[position % ImageIds.length]);}@Overridepublic void onNothingSelected(AdapterView<?> parent){// TODO Auto-generated method stub}});}@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;}}

實現效果如下：

 

android學習筆記15——Galley