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：

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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);
}
}

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);
}
}