Android簡單手電筒的應用可以設置不同的顏色

手電筒對於Android來說是極其常見的一個應用，常見的是通過攝像頭發出光線進行照明，這裡我們沒有采取那樣做而是通過采取通過界面Layout的一些方法來設置可擁有顯示不同顏色。其整體的思路不是太難，首先我們應該在values建立一個color.xml文件來存儲不同的顏色信息:

1. <?xml version="1.0" encoding="utf-8"?>
2. <resources>
3. <color name="white">#FFFFFF</color>
4. <color name="yellow">#FFD700</color>
5. <color name="red">#FF0000</color>
6. <color name="pink">#FF34B3</color>
7. <color name="black">#000000</color>
8. <color name="lightSkyBlue">#87CEFA</color>
9. </resources>

然後以下是我們的源碼文件:

1. public class MainActivity extends Activity {
2. /** Called when the activity is first created. */
5. private LinearLayout mylayout;
6. private Resources mycolor;
8. public void onCreate(Bundle savedInstanceState) {
9. super.onCreate(savedInstanceState);
10. setContentView(R.layout.main);
11. //改背layout背景顏色
12. mylayout=(LinearLayout)findViewById(R.id.myline);
13. //手電筒默認為白色的光
14. setColor(R.color.white);
15. //這裡默認最大亮度
16. setBright(1.0f);
19. }
20. /*
21. * 選擇設置背景顏色
22. * (non-Javadoc)
23. * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)
24. */
25. @Override
26. public boolean onCreateOptionsMenu(Menu menu)
27. {
28. // TODO Auto-generated method stub
29. menu.addSubMenu(0, Menu.FIRST,1, "選擇背景顏色");
30. menu.addSubMenu(0, Menu.FIRST+1,2,"調節背景亮度");
31. menu.addSubMenu(0,Menu.FIRST+2,3, "關於");
32. menu.addSubMenu(0,Menu.FIRST+3,4,"退出");
33. return super.onCreateOptionsMenu(menu);
34. }
35. /*
36. * 選擇處理
37. * (non-Javadoc)
38. * @see android.app.Activity#onMenuItemSelected(int, android.view.MenuItem)
39. */
40. @Override
41. public boolean onMenuItemSelected(int featureId, MenuItem item)
42. {
43. // TODO Auto-generated method stub
44. switch (item.getItemId())
45. {
46. case Menu.FIRST:
47. selectColor();
48. break;
49. case Menu.FIRST+1:
50. selectBright();
51. break;
52. case Menu.FIRST+2:
53. about();
54. break;
55. case Menu.FIRST+3:
56. MainActivity.this.finish();
57. break;
58. default:
59. break;
60. }
61. return super.onMenuItemSelected(featureId, item);
62. }
63. /*
64. * 選擇背景顏色進行設置
65. */
66. private void selectColor()
67. {
68. // 顯示並且設置一些參數
69. final String[] items = {"白色", "紅色", "黑色","黃色","粉色","亮藍色"};
70. new AlertDialog.Builder(MainActivity.this).setTitle("請選擇顏色").setItems(items,
71. new DialogInterface.OnClickListener(){
73. @Override
74. public void onClick(DialogInterface dialog, int which)
75. {
76. // TODO Auto-generated method stub
77. switch (which)
78. {
79. case 0:
80. setColor(R.color.white);
81. break;
82. case 1:
83. setColor(R.color.red);
84. break;
85. case 2:
86. setColor(R.color.black);
87. break;
88. case 3:
89. setColor(R.color.yellow);
90. break;
91. case 4:
92. setColor(R.color.pink);
93. break;
94. case 5:
95. setColor(R.color.lightSkyBlue);
96. break;
97. default:
98. break;
99. }
101. }
103. }).create().show();
106. }
107. /*
108. * 設置亮度
109. */
110. private void selectBright()
111. {
112. final String[] items = {"100%", "75%", "50%","25%","10%"};
113. new AlertDialog.Builder(MainActivity.this).setTitle("請選擇亮度").setItems(items,
114. new DialogInterface.OnClickListener(){
116. @Override
117. public void onClick(DialogInterface dialog, int which)
118. {
119. // TODO Auto-generated method stub
120. switch (which)
121. {
122. case 0:
123. setBright(1.0f);
124. break;
125. case 1:
126. setBright(0.75f);
127. break;
128. case 2:
129. setBright(0.5f);
130. break;
131. case 3:
132. setBright(0.25f);
133. break;
134. case 4:
135. setBright(0.1f);
136. break;
138. default:
139. break;
140. }
142. }
144. }).create().show();
146. }
147. private void about()
148. {
149. new AlertDialog.Builder(MainActivity.this).setTitle("關於我們!!")
150. .setMessage("ZY只為你做更實用的軟件！\n郵箱:[email protected]\n聯系我們！！")
151. .setPositiveButton("確定", new DialogInterface.OnClickListener()
152. {
154. @Override
155. public void onClick(DialogInterface dialog, int which)
156. {
157. // TODO Auto-generated method stub
159. }
160. }).create().show();
162. }
163. /*
164. * 設置背景顏色
165. */
166. private void setColor(int color)
167. {
168. //得到資源的一個對象
169. mycolor=getBaseContext().getResources();
170. Drawable usecolor=mycolor.getDrawable(color);
171. //設置手電筒光的背景顏色
172. mylayout.setBackgroundDrawable(usecolor);
174. }
175. /*
176. * 設置亮度
177. */
178. private void setBright(float light)
179. {
180. WindowManager.LayoutParams lp=getWindow().getAttributes();
181. lp.screenBrightness=light;
182. getWindow().setAttributes(lp);
183. }
185. }

布局文件：

1. <LinearLayout xmlns:android="<A href="http://schemas.android.com/apk/res/android">http://schemas.android.com/apk/res/android</A>"
2. android:orientation="vertical"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:id="@+id/myline"
6. >
7. <TextView
8. android:layout_width="fill_parent"
9. android:layout_height="wrap_content"
10. android:text="@string/hello"
11. android:textSize="30sp"
12. android:textColor="@color/white"
13. />
14. </LinearLayout>

整體來說，代碼並不是太難，很容易理解，Menu和其中設置等一些操作需要我們注意！