Android page, Tab

 

1 public class PagePoint extends View {

2

3 private String TAG = "PagePoint ";

4 Paint p;

5 int totalPage; // the total number of pages.

6 int currentPage;

7 Bitmap bmp, bmp 2;

8 int screenW;

9 int screenH;

10 boolean flag = false;

11

12 int ws; // The Image Width

13 int dw = 10; // distance between points

14 int totalWidth;

15 int startX;

16

17 public PagePoint (Context context, AttributeSet attrs, int defStyle ){

18 super (context, attrs, defStyle );

19 p = new Paint ();

20 p. setFlags (Paint. ANTI_ALIAS_FLAG );

21

22 DisplayMetrics displayMetrics = getResources (). getDisplayMetrics ();

23 screenW = displayMetrics. widthPixels;

24 screenH = displayMetrics. heightPixels;

25

26 bmp = BitmapFactory. decodeResource (getResources (), R. drawable. click); // read-only, cannot be drawn directly on bmp

27 bmp 2 = BitmapFactory. decodeResource (getResources (), R. drawable. clicked); // read-only, cannot be drawn directly on bmp

28

29 ws = bmp. getWidth ();

30 dw = 10;

31

32}

33

34 public PagePoint (Context context, AttributeSet attrs ){

35 this (context, attrs, 0 );

36

37}

38

39 public PagePoint (Context context ){

40 this (context, null );

41

42}

43

44 public void addPagePoint (int number ){

45

46 totalPage = number;

47 currentPage = 0;

48

49}

50

51 public void toPagePoint (int currentPage, int nextOrPre ){

52

53 flag = true;

54 this. currentPage = nextOrPre;

55 totalWidth = ws * totalPage + dw * (totalPage-1 );

56 startX = (screenW-totalWidth)/2;

59 invalidate (startX, screenH-213-ws, startX + (ws + dw) * totalPage, screenH );

60 // invalidate ();

61}

62

63 @ Override

64 public boolean onTouchEvent (MotionEvent event ){

65 Log. I (TAG, "---------- onTouchEvent ----------");

66

67 return super. onTouchEvent (event );

68}

69

70 @ Override

71 protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec ){

72 Log. I (TAG, "---------- onMeasure ----------");

73

74 super. onMeasure (widthMeasureSpec, heightMeasureSpec );

75}

76

77 @ Override

78 protected void onDraw (Canvas canvas ){

79 super. onDraw (canvas );

80 Log. I (TAG, "---------- onDraw ----------");

81

82 totalWidth = ws * totalPage + dw * (totalPage-1 );

83 startX = (screenW-totalWidth)/2; // start position of the vertex

84

85 for (int I = 0; I <totalPage; I ++ ){

86 Log. I (TAG, "startX" + (startX + (ws + dw) * I) + "---------- onDraw ----------");

89 canvas. drawBitmap (currentPage = I? Bmp 2: bmp, startX + (ws + dw) * I, screenH-213 + ws/2, p );

90}

91

92}

93}

The following is the use of pagepoint:

1 public class TestPoint extends Activity {

2

3 Handler handler = new Handler ();

4 PagePoint pagePoint;

5

6

7/** Called when the activity is first created .*/

8 @ Override

9 public void onCreate (Bundle savedInstanceState ){

10 super. onCreate (savedInstanceState );

11

12

13 pagePoint = (PagePoint) findViewById (R. id. test );

14 pagePoint. addPagePoint (2 );

15 // when page turning is simulated

16 handler. postDelayed (new Runnable (){

17

18 @ Override

19 public void run (){

20 for (int I = 1; I <5; I ++ ){

21 pagePoint. toPagePoint (0, I );

22 Log. I ("", "---------- onDraw invalidate ----------");

23

24 break;

25}

26

27}

28}, 2000 );

29

30}

31}

Main. xml content:

1 <? Xml version = "1.0" encoding = "UTF-8"?>

2 <FrameLayout xmlns: android = "http://schemas.android.com/apk/res/android"

3 android: layout_width = "fill_parent"

4 android: layout_height = "fill_parent"

5 android: background = "@ drawable/background"

6 android: orientation = "vertical">

7 <com. hyl. app. PagePoint

8 android: id = "@ + id/test"

9 android: layout_width = "fill_parent"

10 android: layout_height = "wrap_content"/>

11 </FrameLayout>

 

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Author YunLin