我正在尝试实现(又一个!)输入法。我从软键盘示例开始,该示例使用KeyboardView对象的扩展,并扩展View。我想以完全不同的方式扩展View,因此我在我的input.xml中添加了以下内容。请注意,我的目标是为UI提供透明表面。
<?xml version="1.0" encoding="utf-8"?>
<com.diffstrokes.ime.StrokeView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@null"
android:cacheColorHint="@null" >
</com.diffstrokes.ime.StrokeView>
调用输入法的活动被一个浅灰色的背景覆盖。如果我将背景颜色改为半透明的红色,例如,我会看到视图背景上方的几行像素是灰色的。这个背景是从哪里来的,我怎样才能去掉它?
我试图使用LinearLayout代替View。LinearLayout包含两个View标签。在我的onCreateInputView()函数中,我使用以下代码填充LinearLayout:
LinearLayout llo =
(LinearLayout) getLayoutInflater().inflate(
R.layout.dslayout, null);
onCreateInputView()
没有问题地完成了,但在某个时刻我遇到了异常,如下面的日志所示:
06-12 15:17:01.350: E/AndroidRuntime(14002): FATAL EXCEPTION: main
06-12 15:17:01.350: E/AndroidRuntime(14002):
java.lang.IllegalStateException: The specified child already has a
parent. You must call removeView() on the child's parent first. 06-12
15:17:01.350: E/AndroidRuntime(14002): at
android.view.ViewGroup.addViewInner(ViewGroup.java:2117) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
android.view.ViewGroup.addView(ViewGroup.java:2012) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
android.view.ViewGroup.addView(ViewGroup.java:1992) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
android.inputmethodservice.InputMethodService.setInputView(InputMethodService.java:1105)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
android.inputmethodservice.InputMethodService.updateInputViewShown(InputMethodService.java:963)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
android.inputmethodservice.InputMethodService.showWindowInner(InputMethodService.java:1318)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
android.inputmethodservice.InputMethodService.showWindow(InputMethodService.java:1293)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
android.inputmethodservice.InputMethodService$InputMethodImpl.showSoftInput(InputMethodService.java:392)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
android.inputmethodservice.IInputMethodWrapper.executeMessage(IInputMethodWrapper.java:176)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
android.os.Handler.dispatchMessage(Handler.java:99) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
android.os.Looper.loop(Looper.java:130) 06-12 15:17:01.350:
E/AndroidRuntime(14002): at
android.app.ActivityThread.main(ActivityThread.java:3806) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
java.lang.reflect.Method.invokeNative(Native Method) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
java.lang.reflect.Method.invoke(Method.java:507) 06-12 15:17:01.350:
E/AndroidRuntime(14002): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-12 15:17:01.350: E/AndroidRuntime(14002): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 06-12
15:17:01.350: E/AndroidRuntime(14002): at
dalvik.system.NativeStart.main(Native Method)
当我扩展一个视图时,这种情况不会发生。有人能解释一下为什么吗?