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。

android游戏开发之选关画面

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[position]);//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();
            }
        });


    }
}

android游戏开发之选关画面

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