從零開始學android<gallery拖拉組件.二十七.>

標籤：風飛雪未揚   從零開始學android   gallery畫廊組件   

Gallery組件可以實現圖片的畫廊顯示效果。將圖片在畫廊中迴圈播放

繼承結構如下所示

java.lang.Object
?	android.view.View
	?	android.view.ViewGroup
		?	android.widget.AdapterView<T extends android.widget.Adapter>
			?	android.widget.AbsSpinner
				?	android.widget.Gallery

使用Gallery組件同樣要使用Adapter進行資料的配置

在這裡我們使用BaseAdapter進行資料的配置

Xml檔案

<span style="font-size:18px;"><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <Gallery        android:layout_marginTop="20dp"        android:id="@+id/gallery"        android:layout_width="fill_parent"        android:layout_height="wrap_content"         /></RelativeLayout></span>

JAVA檔案

<span style="font-size:18px;">package com.example.gallery;import android.os.Bundle;import android.R.integer;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.Gallery.LayoutParams;import android.widget.ImageView;public class MainActivity extends Activity {private Gallery gallery;//聲明Galleryprivate int images[] = { R.drawable.a1, R.drawable.a2, R.drawable.a3,R.drawable.a4, R.drawable.a5, R.drawable.a6, R.drawable.a7,R.drawable.a8, R.drawable.a9, R.drawable.a10, R.drawable.a11,R.drawable.a12, R.drawable.a13, R.drawable.a14 };// 圖片資料@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);gallery=(Gallery)this.findViewById(R.id.gallery);//獲得Gallerygallery.setAdapter(new MyAdapter());}//建立類繼承BaseAdapterclass MyAdapter extends BaseAdapter{@Overridepublic int getCount() {// TODO Auto-generated method stub//資料量為整形資料的最大值return Integer.MAX_VALUE;}@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 myview, ViewGroup parent) {// TODO Auto-generated method stub//建立I那個View對象ImageView image=new  ImageView(getApplicationContext());//設定圖片資料image.setImageResource(images[position%images.length]);//設定圖片的對齊image.setScaleType(ImageView.ScaleType.FIT_XY);//設定圖片的大小image.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));//返回ImageView return image;}}}</span>

效果如

Gallery就是通過Adapter裝載資料然後在Ui中進行畫廊的顯示

下節預報：GridView網格視圖

從零開始學android<gallery拖拉組件.二十七.>