Android開發：Gallery與ImageSwitcher的綜合使用

今天做了一下Gallery與ImageSwitcher的綜合運用，下面是運行的效果，可以點擊或者手動拖動圖片：

下面附上源碼：

1. package com.Android.cf;
3. import android.app.Activity;
4. import android.graphics.drawable.Drawable;
5. import android.os.Bundle;
6. import android.view.MotionEvent;
7. import android.view.View;
8. import android.view.Window;
9. import android.view.View.OnTouchListener;
10. import android.view.ViewGroup.LayoutParams;
11. import android.view.animation.AnimationUtils;
12. import android.widget.AdapterView;
13. import android.widget.Gallery;
14. import android.widget.ImageSwitcher;
15. import android.widget.ImageView;
16. import android.widget.AdapterView.OnItemClickListener;
17. import android.widget.AdapterView.OnItemSelectedListener;
18. import android.widget.ViewSwitcher.ViewFactory;
20. public class MyMain extends Activity implements ViewFactory,
21. OnItemSelectedListener {
22. private ImageSwitcher mSwitcher;
23. private Gallery mGallery;
24. private int selectedTag = 0;
25. private int upX, downX;
27. /** Called when the activity is first created. */
28. @Override
29. public void onCreate(Bundle savedInstanceState) {
30. super.onCreate(savedInstanceState);
31. requestWindowFeature(Window.FEATURE_NO_TITLE);
32. setContentView(R.layout.main);
33. setTitle("圖片顯示");
35. mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
36. mSwitcher.setFactory(MyMain.this);
37. mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
38. android.R.anim.fade_in));
39. mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
40. android.R.anim.fade_out));
41. mSwitcher.setOnTouchListener(touchlistener);
42. mGallery = (Gallery) findViewById(R.id.gallery);
43. mGallery.setAdapter(new ImageAdapter(MyMain.this));
44. mGallery.setOnItemSelectedListener(this);
45. }
47. /**
48. * (non-Javadoc)
49. *
50. * @see android.widget.ViewSwitcher.ViewFactory#makeView()
51. */
53. @Override
54. public View makeView() {
55. ImageView i = new ImageView(this);
56. i.setBackgroundColor(0xFF000000);
57. i.setScaleType(ImageView.ScaleType.FIT_CENTER);
58. i.setLayoutParams(new ImageSwitcher.LayoutParams(
59. LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
60. return i;
61. }
63. OnTouchListener touchlistener = new OnTouchListener() {
65. @Override
66. public boolean onTouch(View v, MotionEvent event) {
67. if (event.getAction() == MotionEvent.ACTION_DOWN) {
68. downX = (int) event.getX(); // 取得按下時 的坐標x
69. return true;
70. } else if (event.getAction() == MotionEvent.ACTION_UP) {
71. upX = (int) event.getX(); // 取得松開時的坐標x
72. if (upX - downX > 100) { // 從左拖到右，即看前一張
73. // 如果是第一，則去到尾部
74. if (mGallery.getSelectedItemPosition() == 0)
75. selectedTag = mGallery.getCount() - 1;
76. else
77. selectedTag = mGallery.getSelectedItemPosition() - 1;
78. } else if (downX - upX > 100)// 從右拖到左，即看後一張
79. {
80. // 如果是最後，則去到第一
81. if (mGallery.getSelectedItemPosition() == (mGallery
82. .getCount() - 1))
83. selectedTag = 0;
84. else
85. selectedTag = mGallery.getSelectedItemPosition() + 1;
86. }
87. // 改變gallery圖片所選，自動觸發ImageSwitcher的setOnItemSelectedListener
88. mGallery.setSelection(selectedTag, true);
89. return true;
91. }
92. return false;
93. }
95. };
97. /**
98. * (non-Javadoc)
99. *
100. * @see android.widget.AdapterView.OnItemSelectedListener#onItemSelected(android.widget.AdapterView,
101. * android.view.View, int, long)
102. */
104. @Override
105. public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
106. long arg3) {
107. mSwitcher.setImageResource(ImageAdapter.imageIDs[arg2]);
108. selectedTag = arg2;
109. }
111. /**
112. * (non-Javadoc)
113. *
114. * @see android.widget.AdapterView.OnItemSelectedListener#onNothingSelected(android.widget.AdapterView)
115. */
117. @Override
118. public void onNothingSelected(AdapterView<?> arg0) {
120. }
121. }