Android之使用RatingBar设置游戏难度并保存

最近在学习游戏开发，在游戏中常常需要设置游戏的难度，在Android中我们可以使用RatingBar来实现。具体看下面的代码：

效果图如下：

package com.cloay.pt.ui;

import java.io.FileNotFoundException;
import java.io.IOException;

import android.content.ContentResolver;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.RatingBar;
import android.widget.RatingBar.OnRatingBarChangeListener;
import android.widget.TextView;

import com.cloay.pt.BasicActivity;
import com.cloay.pt.R;
import com.cloay.pt.constants.Constant;
import com.cloay.pt.utils.ImageUtil;

/**
 * 游戏设置类,游戏难度等
 * @author Cloay
 * 2011-12-23
 * 下午05:21:41
 */
public class SettingsActivity extends BasicActivity{
	private SharedPreferences settings;  //保存设置
	private RatingBar ratingBar;
	private TextView defaultPicture;
	private TextView picture;
	private ImageView previewImage;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.settings);
		BasicActivity.allActivity.add(this);
		//初始化数据
		initData();
	}
	
	/**
	 * 初始化数据
	 */
	private void initData() {
		settings = getSharedPreferences("settings", 0);
		ratingBar = (RatingBar) findViewById(R.id.rating);
		//游戏默认图片
		defaultPicture = (TextView) findViewById(R.id.def);
		//从图库中选择图片，自定义
		picture = (TextView) findViewById(R.id.picture);
		previewImage = (ImageView)findViewById(R.id.preview);
		if("".equals(settings.getString("picture", ""))) {
			previewImage.setImageResource(R.drawable.def);
		}else{
			previewImage.setImageBitmap(ImageUtil.getBitmapFromSDCard(settings.getString("picture", "")));
		}
		//设置难度选择监听
		ratingBar.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {
			@Override
			public void onRatingChanged(RatingBar ratingBar, float rating,
					boolean fromUser) {
				settings.edit().putInt("level", (int)rating).commit();   //保存用户设置后的游戏难度
				showToast(SettingsActivity.this, (int)rating);
			}
		});
		//设置图片选择监听
		defaultPicture.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				settings.edit().putString("picture", "").commit();
				previewImage.setImageResource(R.drawable.def);
			}
		});
		picture.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent();  
                /* 开启Pictures画面Type设定为image */  
                intent.setType("image/*");  
                /* 使用Intent.ACTION_GET_CONTENT这个Action */  
                intent.setAction(Intent.ACTION_GET_CONTENT); 
                /* 取得相片后返回本画面 */  
                startActivityForResult(intent, 1);
			}
		});
		
	}
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (resultCode == RESULT_OK) {  
            Uri uri = data.getData();  
            ContentResolver cr = this.getContentResolver();  
            try {  
                Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));  
                try {
					saveBitmap("cloay", bitmap);
				} catch (IOException e) {
					e.printStackTrace();
				}
				settings.edit().putString("picture", Constant.picPath + "cloay.png").commit();
				previewImage.setImageBitmap(bitmap);
            } catch (FileNotFoundException e) {  
            	settings.edit().putString("picture", "").commit();
            	previewImage.setImageResource(R.drawable.def);
            }  
        } 
		super.onActivityResult(requestCode, resultCode, data);
	}
}

通过设置setOnRatingBarChangeListener监听器来获取用户选择RatingBar的值，获取之后往往需要保存，通常使用SharedPrefence即可，也可选用SQLite等。SharedPrefence的使用详细请看:  Android SharedPreferences的使用

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