android屏幕分页,页标
1 public class PagePoint extends View {
2
3 private String TAG = "PagePoint";
4 Paint p;
5 int totalPage;//总页面数
6 int currentPage;
7 Bitmap bmp, bmp2;
8 int screenW;
9 int screenH;
10 boolean flag = false;
11
12 int ws;//图片的宽
13 int dw = 10;//点之间的间距
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);// 只读,不能直接在bmp上画
27 bmp2 = BitmapFactory.decodeResource(getResources(), R.drawable.clicked);// 只读,不能直接在bmp上画
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;//点的起始位置
84
85 for (int i = 0; i < totalPage; i++) {
86 Log.i(TAG, "startX" + (startX + (ws + dw) * i) + "----------onDraw----------");
89 canvas.drawBitmap(currentPage == i ? bmp2 : bmp, startX + (ws + dw) * i, screenH - 213 + ws / 2, p);
90 }
91
92 }
93 }
下面是pagepoint的使用：
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 //模拟翻页的时候切换页标
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内容：
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"补充：移动开发 , Android ,
