android游戏开发之选关画面
在游戏开发中，往往要提供选关的页面，选择关卡可以简单地使用listView，如果想效果好一点，可以选择 用gallery控件。Gallery控件的使用在api demo里面有很详尽的用法介绍，如果不想看api demo,下面有我精简了的代码：程序的效果是可以拖动图片，单击选择。
http://dl.iteye.com/upload/picture/pic/44665/18bdc00d-bb62-3baf-b4b6-cc7f474504d4.jpg
首先在layout里面定义gallery控件：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /><Gallery android:id="@+id/Gallery01" android:layout_width="fill_parent" android:layout_height="wrap_content"></Gallery></LinearLayout>
再定义Adapter，这个类是用来控制gallery的图片源等操作的。
package com.ray.test;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class ImageAdapter extends BaseAdapter {private Context mContext; //define Context private Integer[] mImageIds = { //picture source R.drawable.p1, R.drawable.p2, R.drawable.p3, R.drawable.p4, R.drawable.p5, R.drawable.p6, R.drawable.p7, R.drawable.p8, }; public ImageAdapter(Context c) { //define ImageAdapter mContext = c; } //get the picture number public int getCount() { return mImageIds.length; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { ImageView i = new ImageView(mContext); i.setImageResource(mImageIds);//set resource for the imageView i.setLayoutParams(new Gallery.LayoutParams(192, 192));//layout i.setScaleType(ImageView.ScaleType.FIT_XY);//set scale type return i; }}
最后是Activity调用：
package com.ray.test;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.Gallery;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;public class TestGallery extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Gallery g = (Gallery) findViewById(R.id.Gallery01);//get Gallery component g.setAdapter(new ImageAdapter(this));//set image resource for gallery //add listener g.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View v, int position, long id) { //just a test,u can start a game activity Toast.makeText(TestGallery.this, "" + position, Toast.LENGTH_SHORT).show(); } }); }}
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