Android開發之使用RatingBar設置游戲難度並保存

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：

1. package com.cloay.pt.ui;
3. import java.io.FileNotFoundException;
4. import java.io.IOException;
6. import android.content.ContentResolver;
7. import android.content.Intent;
8. import android.content.SharedPreferences;
9. import android.graphics.Bitmap;
10. import android.graphics.BitmapFactory;
11. import android.net.Uri;
12. import android.os.Bundle;
13. import android.view.View;
14. import android.view.View.OnClickListener;
15. import android.widget.ImageView;
16. import android.widget.RatingBar;
17. import android.widget.RatingBar.OnRatingBarChangeListener;
18. import android.widget.TextView;
20. import com.cloay.pt.BasicActivity;
21. import com.cloay.pt.R;
22. import com.cloay.pt.constants.Constant;
23. import com.cloay.pt.utils.ImageUtil;
25. /**
26. * 游戲設置類,游戲難度等
27. * @author Cloay
28. * 2011-12-23
29. * 下午05:21:41
30. */
31. public class SettingsActivity extends BasicActivity{
32. private SharedPreferences settings; //保存設置
33. private RatingBar ratingBar;
34. private TextView defaultPicture;
35. private TextView picture;
36. private ImageView previewImage;
37. @Override
38. protected void onCreate(Bundle savedInstanceState) {
39. super.onCreate(savedInstanceState);
40. setContentView(R.layout.settings);
41. BasicActivity.allActivity.add(this);
42. //初始化數據
43. initData();
44. }
46. /**
47. * 初始化數據
48. */
49. private void initData() {
50. settings = getSharedPreferences("settings", 0);
51. ratingBar = (RatingBar) findViewById(R.id.rating);
52. //游戲默認圖片
53. defaultPicture = (TextView) findViewById(R.id.def);
54. //從圖庫中選擇圖片，自定義
55. picture = (TextView) findViewById(R.id.picture);
56. previewImage = (ImageView)findViewById(R.id.preview);
57. if("".equals(settings.getString("picture", ""))) {
58. previewImage.setImageResource(R.drawable.def);
59. }else{
60. previewImage.setImageBitmap(ImageUtil.getBitmapFromSDCard(settings.getString("picture", "")));
61. }
62. //設置難度選擇監聽
63. ratingBar.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {
64. @Override
65. public void onRatingChanged(RatingBar ratingBar, float rating,
66. boolean fromUser) {
67. settings.edit().putInt("level", (int)rating).commit(); //保存用戶設置後的游戲難度
68. showToast(SettingsActivity.this, (int)rating);
69. }
70. });
71. //設置圖片選擇監聽
72. defaultPicture.setOnClickListener(new OnClickListener() {
73. @Override
74. public void onClick(View v) {
75. settings.edit().putString("picture", "").commit();
76. previewImage.setImageResource(R.drawable.def);
77. }
78. });
79. picture.setOnClickListener(new OnClickListener() {
80. @Override
81. public void onClick(View v) {
82. Intent intent = new Intent();
83. /* 開啟Pictures畫面Type設定為image */
84. intent.setType("image/*");
85. /* 使用Intent.ACTION_GET_CONTENT這個Action */
86. intent.setAction(Intent.ACTION_GET_CONTENT);
87. /* 取得相片後返回本畫面 */
88. startActivityForResult(intent, 1);
89. }
90. });
92. }
94. @Override
95. protected void onActivityResult(int requestCode, int resultCode, Intent data) {
96. if (resultCode == RESULT_OK) {
97. Uri uri = data.getData();
98. ContentResolver cr = this.getContentResolver();
99. try {
100. Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
101. try {
102. saveBitmap("cloay", bitmap);
103. } catch (IOException e) {
104. e.printStackTrace();
105. }
106. settings.edit().putString("picture", Constant.picPath + "cloay.png").commit();
107. previewImage.setImageBitmap(bitmap);
108. } catch (FileNotFoundException e) {
109. settings.edit().putString("picture", "").commit();
110. previewImage.setImageResource(R.drawable.def);
111. }
112. }
113. super.onActivityResult(requestCode, resultCode, data);
114. }
115. }

通過設置setOnRatingBarChangeListener監聽器來獲取用戶選擇RatingBar的值，獲取之後往往需要保存，通常使用SharedPrefence即可，也可選用SQLite等。SharedPrefence的使用詳細請看: Android SharedPreferences的使用 http://www.linuxidc.com/Linux/2011-11/48029.htm