android – 在触摸时更改gridview中项目的背景颜色

概述我有一个gridView布局,其中填充了textView元素.我有一个gridView的onTouch()实现,其中被触摸的单元格需要更改背景颜色.下面是我的代码,但它不起作用,当我触摸时VM关闭. gridView.setOnTouchListener(new OnTouchListener() { public boolean onTouch(View v, MotionEve 我有一个grIDVIEw布局,其中填充了textVIEw元素.我有一个grIDVIEw的ontouch()实现,其中被触摸的单元格需要更改背景颜色.下面是我的代码,但它不起作用,当我触摸时VM关闭.

grIDVIEw.setontouchListener(new OntouchListener() {        public boolean ontouch(VIEw v,MotionEvent me) {            int action = me.getActionMasked();            float currentXposition = me.getX();            float currentYposition = me.getY();            int position = grIDVIEw.pointToposition((int) currentXposition,(int) currentYposition);            // Change the color of the key pressed            ((TextVIEw) grIDVIEw.getItemAtposition(position)).setBackgroundcolor(color.RED);            return true;    }}

编辑：Logcat跟踪

12-10 15:34:28.081: E/inputEventReceiver(829): Exception dispatching input event.12-10 15:34:28.081: E/MessageQueue-JNI(829): Exception in MessageQueue callback: handleReceiveCallback12-10 15:34:28.221: E/MessageQueue-JNI(829): java.lang.classCastException: java.lang.String cannot be cast to androID.Widget.TextVIEw12-10 15:34:28.221: E/MessageQueue-JNI(829):    at com.example.helloworld.GrIDVIEwActivity.ontouch(GrIDVIEwActivity.java:62)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEw.dispatchtouchEvent(VIEw.java:7122)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2170)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1905)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.superdispatchtouchEvent(PhoneWindow.java:1925)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at com.androID.internal.policy.impl.PhoneWindow.superdispatchtouchEvent(PhoneWindow.java:1379)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.app.Activity.dispatchtouchEvent(Activity.java:2396)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.dispatchtouchEvent(PhoneWindow.java:1873)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEw.dispatchPointerEvent(VIEw.java:7307)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwRootImpl.deliverPointerEvent(VIEwRootImpl.java:3174)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwRootImpl.deliverinputEvent(VIEwRootImpl.java:3119)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwRootImpl.doProcessinputEvents(VIEwRootImpl.java:4155)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwRootImpl.enqueueinputEvent(VIEwRootImpl.java:4134)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.VIEwRootImpl$WindowinputEventReceiver.oninputEvent(VIEwRootImpl.java:4226)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.vIEw.inputEventReceiver.dispatchinputEvent(inputEventReceiver.java:171)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.os.MessageQueue.nativePollOnce(Native Method)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.os.MessageQueue.next(MessageQueue.java:125)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.os.Looper.loop(Looper.java:124)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at androID.app.ActivityThread.main(ActivityThread.java:4745)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at java.lang.reflect.Method.invokeNative(Native Method)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at java.lang.reflect.Method.invoke(Method.java:511)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:553)12-10 15:34:28.221: E/MessageQueue-JNI(829):    at dalvik.system.NativeStart.main(Native Method)12-10 15:34:28.263: D/AndroIDRuntime(829): Shutting down VM12-10 15:34:28.263: W/dalvikvm(829): threadID=1: thread exiting with uncaught exception (group=0x40a13300)12-10 15:34:28.362: E/AndroIDRuntime(829): FATAL EXCEPTION: main12-10 15:34:28.362: E/AndroIDRuntime(829): java.lang.classCastException: java.lang.String cannot be cast to androID.Widget.TextVIEw12-10 15:34:28.362: E/AndroIDRuntime(829):  at com.example.helloworld.GrIDVIEwActivity.ontouch(GrIDVIEwActivity.java:62)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEw.dispatchtouchEvent(VIEw.java:7122)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2170)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1905)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtransformedtouchEvent(VIEwGroup.java:2176)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwGroup.dispatchtouchEvent(VIEwGroup.java:1877)12-10 15:34:28.362: E/AndroIDRuntime(829):  at com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.superdispatchtouchEvent(PhoneWindow.java:1925)12-10 15:34:28.362: E/AndroIDRuntime(829):  at com.androID.internal.policy.impl.PhoneWindow.superdispatchtouchEvent(PhoneWindow.java:1379)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.app.Activity.dispatchtouchEvent(Activity.java:2396)12-10 15:34:28.362: E/AndroIDRuntime(829):  at com.androID.internal.policy.impl.PhoneWindow$DecorVIEw.dispatchtouchEvent(PhoneWindow.java:1873)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEw.dispatchPointerEvent(VIEw.java:7307)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwRootImpl.deliverPointerEvent(VIEwRootImpl.java:3174)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwRootImpl.deliverinputEvent(VIEwRootImpl.java:3119)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwRootImpl.doProcessinputEvents(VIEwRootImpl.java:4155)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwRootImpl.enqueueinputEvent(VIEwRootImpl.java:4134)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.VIEwRootImpl$WindowinputEventReceiver.oninputEvent(VIEwRootImpl.java:4226)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.vIEw.inputEventReceiver.dispatchinputEvent(inputEventReceiver.java:171)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.os.MessageQueue.nativePollOnce(Native Method)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.os.MessageQueue.next(MessageQueue.java:125)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.os.Looper.loop(Looper.java:124)12-10 15:34:28.362: E/AndroIDRuntime(829):  at androID.app.ActivityThread.main(ActivityThread.java:4745)12-10 15:34:28.362: E/AndroIDRuntime(829):  at java.lang.reflect.Method.invokeNative(Native Method)12-10 15:34:28.362: E/AndroIDRuntime(829):  at java.lang.reflect.Method.invoke(Method.java:511)12-10 15:34:28.362: E/AndroIDRuntime(829):  at com.androID.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)12-10 15:34:28.362: E/AndroIDRuntime(829):  at com.androID.internal.os.ZygoteInit.main(ZygoteInit.java:553)12-10 15:34:28.362: E/AndroIDRuntime(829):  at dalvik.system.NativeStart.main(Native Method)

解决方法 实际上,我想通了！

我在这里对错误的返回类型进行类型转换

((TextVIEw) grIDVIEw.getItemAtposition(position)).setBackgroundcolor(color.RED);

我真正需要的是方法getChildAt而不是getItemAtposition(返回一个String)

String s = (String) grIDVIEw.getItemAtposition(position);TextVIEw tv = (TextVIEw) grIDVIEw.getChildAt(position);tv.setBackgroundcolor(color.RED);

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