Android控件TextProgressBar进度条上显文字
01.public class TextProgressBar extends RelativeLayout implements OnChronometerTickListener {
02. public static final String TAG = \"TextProgressBar\";
03.
04. static final int CHRONOMETER_ID = android.R.id.text1;
05. static final int PROGRESSBAR_ID = android.R.id.progress;
06.
07. Chronometer mChronometer = null;
08. ProgressBar mProgressBar = null;
09.
10. long mDurationBase = -1;
11. int mDuration = -1;
12. boolean mChronometerFollow = false;
13. int mChronometerGravity = Gravity.NO_GRAVITY;
14.
15. public TextProgressBar(Context context, AttributeSet attrs, int defStyle) {
16. super(context, attrs, defStyle);
17. }
18. public TextProgressBar(Context context, AttributeSet attrs) {
19. super(context, attrs);
20. }
21. public TextProgressBar(Context context) {
22. super(context);
23. }
24. //Android开发网提示关键部分在这里
25.
26. @Override
27. public void addView(View child, int index, ViewGroup.LayoutParams params) {
28. super.addView(child, index, params);
29.
30. int childId = child.getId();
31. if (childId == CHRONOMETER_ID && child instanceof Chronometer) {
32. mChronometer = (Chronometer) child;
33. mChronometer.setOnChronometerTickListener(this);
34.
35. // Check if Chronometer should move with with ProgressBar
36. mChronometerFollow = (params.width == ViewGroup.LayoutParams.WRAP_CONTENT);
37. mChronometerGravity = (mChronometer.getGravity() & Gravity.HORIZONTAL_GRAVITY_MASK);
38.
39. } else if (childId == PROGRESSBAR_ID && child instanceof ProgressBar) {
40. mProgressBar = (ProgressBar) child;
41. }
42. }
43.
44. @android.view.RemotableViewMethod
45. public void setDurationBase(long durationBase) {
46. mDurationBase = durationBase;
47.
48. if (mProgressBar == null || mChronometer == null) {
49. throw new RuntimeException(\"Expecting child ProgressBar with id \" +
50. \"\'android.R.id.progress\' and Chronometer id \'android.R.id.text1\'\");
51. }
52.
53. // Update the ProgressBar maximum relative to Chronometer base
54. mDuration = (int) (durationBase - mChronometer.getBase());
55. if (mDuration <= 0) {
56. mDuration = 1;
57. }
58. mProgressBar.setMax(mDuration);
59. }
60.
61.
62. public void onChronometerTick(Chronometer chronometer) {
63. if (mProgressBar == null) {
64. throw new RuntimeException(
65. \"Expecting child ProgressBar with id \'android.R.id.progress\'\");
66. }
67.
68. // Stop Chronometer if we\'re past duration
69. long now = SystemClock.elapsedRealtime();
70. if (now >= mDurationBase) {
71. mChronometer.stop();
72. }
73.
74. int remaining = (int) (mDurationBase - now);
75. mProgressBar.setProgress(mDuration - remaining);
76.
77.
78. if (mChronometerFollow) {
79. RelativeLayout.LayoutParams params;
80.
81.
82. params = (RelativeLayout.LayoutParams) mProgressBar.getLayoutParams();
83. int contentWidth = mProgressBar.getWidth() - (params.leftMargin + params.rightMargin);
84. int leadingEdge = ((contentWidth * mProgressBar.getProgress()) /
85. mProgressBar.getMax()) + params.leftMargin;
86.
87.
88. int adjustLeft = 0;
89. int textWidth = mChronometer.getWidth();
90. if (mChronometerGravity == Gravity.RIGHT) {
91. adjustLeft = -textWidth;
92. } else if (mChronometerGravity == Gravity.CENTER_HORIZONTAL) {
93. adjustLeft = -(textWidth / 2);
94. }
95.
96.
97. leadingEdge += adjustLeft;
98. int rightLimit = contentWidth - params.rightMargin - textWidth;
99. if (leadingEdge < params.leftMargin) {
100. leadingEdge = params.leftMargin;
101. } else if (leadingEdge > rightLimit) {
102. leadingEdge = rightLimit;
103. }
104.
105. params = (RelativeLayout.LayoutParams) mChronometer.getLayoutParams();
106. params.leftMargin = leadingEdge;
107.
108.
109. mChronometer.requestLayout();
110.
111. }
112. }
113.}