Android之使用RatingBar設置游戲難度并保存

最近在學習游戲開發，在游戲中常常需要設置游戲的難度，在Android中我們可以使用RatingBar來實現。具體看下面的代碼：

效果圖如下：

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;
/**

游戲設置類,游戲難度等
@author Cloay
2011-12-23
下午05:21:41
*/
public class SettingsActivity extends BasicActivity{
 private SharedPreferences settings;  //保存設置
 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);
 //初始化數據
 initData();

}
/**

初始化數據
*/
private void initData() {
 settings = getSharedPreferences("settings", 0);
 ratingBar = (RatingBar) findViewById(R.id.rating);
 //游戲默認圖片
 defaultPicture = (TextView) findViewById(R.id.def);
 //從圖庫中選擇圖片，自定義
 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", "")));

}
 //設置難度選擇監聽
 ratingBar.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {

 @Override
 public void onRatingChanged(RatingBar ratingBar, float rating,
         boolean fromUser) {
     settings.edit().putInt("level", (int)rating).commit();   //保存用戶設置后的游戲難度
     showToast(SettingsActivity.this, (int)rating);
 }

});
 //設置圖片選擇監聽
 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();  
     /* 開啟Pictures畫面Type設定為image */  
     intent.setType("image/*");  
     /* 使用Intent.ACTION_GET_CONTENT這個Action */  
     intent.setAction(Intent.ACTION_GET_CONTENT); 
     /* 取得相片后返回本畫面 */  
     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);
}
}</pre>通過設置setOnRatingBarChangeListener監聽器來獲取用戶選擇RatingBar的值，獲取之后往往需要保存，通常使用SharedPrefence即可，也可選用SQLite等 



轉自：http://blog.csdn.net/shang_515/article/details/7313412