gallery在android2.3以下可以点击，但是在4.0系统后就出现空指针问题：
08-10 04:34:11.888: WARN/dalvikvm(7329): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
08-10 04:34:11.968: WARN/System.err(7329): java.lang.NullPointerException
08-10 04:34:12.087: WARN/System.err(7329): at android.view.GestureDetector.onTouchEvent(GestureDetector.java:587)
08-10 04:34:12.087: WARN/System.err(7329): at android.widget.Gallery.onTouchEvent(Gallery.java:937)
08-10 04:34:12.087: WARN/System.err(7329): at android.view.View.dispatchTouchEvent(View.java:5486)
08-10 04:34:12.087: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1953)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1714)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.109: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
08-10 04:34:12.139: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.139: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
08-10 04:34:12.139: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.157: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
08-10 04:34:12.157: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.157: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)
08-10 04:34:12.157: WARN/System.err(7329): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1892)
08-10 04:34:12.157: WARN/System.err(7329): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1371)
08-10 04:34:12.157: WARN/System.err(7329): at android.app.Activity.dispatchTouchEvent(Activity.java:2364)
08-10 04:34:12.157: WARN/System.err(7329): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1840)
08-10 04:34:12.167: WARN/System.err(7329): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:1959)
08-10 04:34:12.167: WARN/System.err(7329): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1728)