ADC Demo

ADCActivity.java

1. packagecom.mini6410.ADC;
3. importjava.util.Timer;
4. importjava.util.TimerTask;
6. importandroid.app.Activity;
7. importandroid.os.Bundle;
8. importandroid.os.Handler;
9. importandroid.os.Message;
10. importandroid.util.Log;
11. importandroid.widget.TextView;
13. importcom.friendlyarm.AndroidSDK.HardwareControler;
14. importcom.mini6410.R;
16. /**
17. *
18. *ClassName:ADCActivity
19. *Reason:ADCDemo
20. *
21. *@authorsnowdream
22. *@version
23. *@sinceVer1.1
24. *@Date20112012-03-1612:04
25. *
26. *@see
27. */
28. publicclassADCActivityextendsActivity{
29. privatestaticfinalStringTAG="ADCActivity";
31. /*刷新UI标记*/
32. publicstaticfinalintUpdate_UI=0;
34. /*计时器*/
35. privateTimermTimer=null;
36. privateTimerTaskmTimerTask=null;
38. /*用来显示ADC返回值的控件*/
39. privateTextViewmTextView_ADC=null;
41. /*读取ADC的返回值*/
42. privateintresult=0;
44. @Override
45. protectedvoidonCreate(BundlesavedInstanceState){
46. super.onCreate(savedInstanceState);
47. setContentView(R.layout.adcdemo);
49. initUI();
50. initData();
51. }
53. /**
54. *
55. *initUI:初始化UI
56. *
57. *@param
58. *@return
59. *@throws
60. */
61. privatevoidinitUI(){
62. mTextView_ADC=(TextView)findViewById(R.id.TextView_adcresult);
63. }
65. /**
66. *
67. *initData:新建定时器，每隔500ms发出消息，通知Activity刷新UI一次。
68. *
69. *@param
70. *@return
71. *@throws
72. */
73. privatevoidinitData(){
74. mTimer=newTimer();
75. mTimerTask=newTimerTask(){
76. @Override
77. publicvoidrun(){
79. /*调用底层库API读取ADC的值，正常情况下，返回ADC值，否则，出错，返回-1*/
80. result=HardwareControler.readADC();
82. if(-1==result){
83. Log.e(TAG,"ReadADCError!");
84. }else{
85. Log.i(TAG,"readADCresult:"+result);
86. mHandler.sendMessage(mHandler.obtainMessage(Update_UI));
87. }
88. }
89. };
90. mTimer.schedule(mTimerTask,0,500);
91. }
93. privateHandlermHandler=newHandler(){
94. @Override
95. publicvoidhandleMessage(Messagemsg){
96. inttype=msg.what;
97. switch(type){
98. caseUpdate_UI:
99. mTextView_ADC.setText(String.valueOf(result));
100. break;
101. default:
102. break;
103. }
104. }
106. };
108. @Override
109. protectedvoidonDestroy(){
110. if(mTimer!=null){
111. mTimer.cancel();
112. mTimer=null;
113. }
114. super.onDestroy();
115. }
118. }

adcdemo.xml

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="vertical">
7. <TextView
8. android:id="@+id/TextView_adctitle"
9. android:layout_width="wrap_content"
10. android:layout_height="wrap_content"
11. android:gravity="center"
12. android:text="@string/adcreslt"
13. android:textSize="25sp"/>
15. <TextView
16. android:id="@+id/TextView_adcresult"
17. android:layout_width="fill_parent"
18. android:layout_height="130dip"
19. android:gravity="center"
20. android:text="0"
21. android:textColor="@drawable/mediumvioletred"
22. android:textSize="80sp"/>
25. </LinearLayout>

预览效果: