Android_左右滑动切换背景

最近想做一个左右滑动切换背景图片的应用，特地将自己的研究分享一下：

这个需要继承2个监听接口 OnGestureListener, OnTouchListener

关于这2个接口大家可以在网上查一下

同事需要设置2个属性 bgLayout.setOnTouchListener(this);

bgLayout.setLongClickable(true);

并且在这个函数中有如下这几句话

public boolean onTouch(View v, MotionEvent event) {

// TODO Auto-generated method stub

return this.mGesture.onTouchEvent(event);

}

附送代码：

[html] view plain copy print ?

1. public class SwitcherActivity extends Activity implements OnGestureListener,
2. OnTouchListener {
3. /** Called when the activity is first created. */
4. LinearLayout bgLayout = null;
5. private GestureDetector mGesture = null;
6. private int flag = 3;
8. @Override
9. public void onCreate(Bundle savedInstanceState) {
10. super.onCreate(savedInstanceState);
11. setContentView(R.layout.main);
13. mGesture = new GestureDetector(this);
15. bgLayout = (LinearLayout) findViewById(R.id.bg);
16. bgLayout.setBackgroundResource(R.drawable.bg3);
17. bgLayout.setOnTouchListener(this);
18. bgLayout.setLongClickable(true);
19. }
21. public boolean onDown(MotionEvent e) {
22. // TODO Auto-generated method stub
23. return false;
24. }
26. public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
27. float velocityY) {
28. // 处理左右滑动
29. if (e1.getX() - e2.getX() > 100) { // 向左滑动
30. if (flag == 3) {
31. bgLayout.setBackgroundResource(R.drawable.bg4);
32. flag = 4;
33. return true;
34. }
35. if (flag == 4) {
36. bgLayout.setBackgroundResource(R.drawable.bg5);
37. flag = 5;
38. return true;
39. }
40. if (flag == 1) {
41. bgLayout.setBackgroundResource(R.drawable.bg2);
42. flag = 2;
43. return true;
44. }
45. if (flag == 2) {
46. bgLayout.setBackgroundResource(R.drawable.bg3);
47. flag = 3;
48. return true;
49. }
50. } else if (e1.getX() - e2.getX() < -100) { // 向右滑动
51. if (flag == 3) {
52. bgLayout.setBackgroundResource(R.drawable.bg2);
53. flag = 2;
54. return true;
55. }
56. if (flag == 2) {
57. bgLayout.setBackgroundResource(R.drawable.bg1);
58. flag = 1;
59. return true;
60. }
61. if (flag == 5) {
62. bgLayout.setBackgroundResource(R.drawable.bg4);
63. flag = 4;
64. return true;
65. }
66. if (flag == 4) {
67. bgLayout.setBackgroundResource(R.drawable.bg3);
68. flag = 3;
69. return true;
70. }
71. }
72. return false;
73. }
75. public void onLongPress(MotionEvent e) {
76. // TODO Auto-generated method stub
78. }
80. public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
81. float distanceY) {
82. // TODO Auto-generated method stub
83. return false;
84. }
86. public void onShowPress(MotionEvent e) {
87. // TODO Auto-generated method stub
89. }
91. public boolean onSingleTapUp(MotionEvent e) {
92. // TODO Auto-generated method stub
93. return false;
94. }
96. public boolean onTouch(View v, MotionEvent event) {
97. // TODO Auto-generated method stub
98. return this.mGesture.onTouchEvent(event);
99. }
100. }

public class SwitcherActivity extends Activity implements OnGestureListener,
		OnTouchListener {
	/** Called when the activity is first created. */
	LinearLayout bgLayout = null;
	private GestureDetector mGesture = null;
	private int flag = 3;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		mGesture = new GestureDetector(this);

		bgLayout = (LinearLayout) findViewById(R.id.bg);
		bgLayout.setBackgroundResource(R.drawable.bg3);
		bgLayout.setOnTouchListener(this);
		bgLayout.setLongClickable(true);
	}

	public boolean onDown(MotionEvent e) {
		// TODO Auto-generated method stub
		return false;
	}

	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
			float velocityY) {
		// 处理左右滑动
		if (e1.getX() - e2.getX() > 100) { // 向左滑动
			if (flag == 3) {
				bgLayout.setBackgroundResource(R.drawable.bg4);
				flag = 4;
				return true;
			}
			if (flag == 4) {
				bgLayout.setBackgroundResource(R.drawable.bg5);
				flag = 5;
				return true;
			}
			if (flag == 1) {
				bgLayout.setBackgroundResource(R.drawable.bg2);
				flag = 2;
				return true;
			}
			if (flag == 2) {
				bgLayout.setBackgroundResource(R.drawable.bg3);
				flag = 3;
				return true;
			}
		} else if (e1.getX() - e2.getX() < -100) { // 向右滑动
			if (flag == 3) {
				bgLayout.setBackgroundResource(R.drawable.bg2);
				flag = 2;
				return true;
			}
			if (flag == 2) {
				bgLayout.setBackgroundResource(R.drawable.bg1);
				flag = 1;
				return true;
			}
			if (flag == 5) {
				bgLayout.setBackgroundResource(R.drawable.bg4);
				flag = 4;
				return true;
			}
			if (flag == 4) {
				bgLayout.setBackgroundResource(R.drawable.bg3);
				flag = 3;
				return true;
			}
		}
		return false;
	}

	public void onLongPress(MotionEvent e) {
		// TODO Auto-generated method stub

	}

	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
			float distanceY) {
		// TODO Auto-generated method stub
		return false;
	}

	public void onShowPress(MotionEvent e) {
		// TODO Auto-generated method stub

	}

	public boolean onSingleTapUp(MotionEvent e) {
		// TODO Auto-generated method stub
		return false;
	}

	public boolean onTouch(View v, MotionEvent event) {
		// TODO Auto-generated method stub
		return this.mGesture.onTouchEvent(event);
	}
}