Android 使用setMeasuredDimension（）时出现的问题

我需要一个复杂的定制设计我自己的单选按钮（这不是 可能只使用九个补丁）

所以我考虑扩展RadioButton并使用 放射组

对于复杂的定制设计，我将线性布局充气（首先 使用了RelativeLayout，但它似乎抛出了NullPointerException，所以我 尝试了线性布局，但效果相反）

嗯，我有一些测量，布局和绘图的问题 线性布局

让我们假设有这样一个复杂的定制设计：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="100dip" android:layout_height="wrap_content" android:orientation="vertical" android:layout_weight="1"... >

    <TextView android:id="@+id/tab_count" android:layout_width="wrap_content" android:layout_height="wrap_content"... />

    <TextView android:id="@+id/tab_text" android:layout_width="wrap_content" android:layout_height="wrap_content"... />

</LinearLayout>

实际上我不知道如何计算测量尺寸。成为 老实说，我希望放射组为我和我计算出足够的空间 要将此空间委托给充气线性布局

谢谢你在这件事上帮助我

致以最良好的祝愿，

---

马可

好吧，解决办法很简单：）

现在我想谈谈RelatriveLayout NullPointerException

我将LinearLayout更改为RelativeLayout，得到的结果如下：

FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:472)
at android.view.View.measure(View.java:12603)
at nu.style.RadioView.onMeasure(RadioView.java:84)
at android.view.View.measure(View.java:12603)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1196)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:555)
at android.view.View.measure(View.java:12603)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
at android.view.View.measure(View.java:12603)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1163)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at android.widget.ScrollView.onMeasure(ScrollView.java:312)
at android.view.View.measure(View.java:12603)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
at android.view.View.measure(View.java:12603)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at android.view.View.measure(View.java:12603)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
at android.view.View.measure(View.java:12603)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
at android.view.View.measure(View.java:12603)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1044)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4340)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)

谢谢你的帮助

致以最良好的祝愿， 马可

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    container.measure(widthMeasureSpec, heightMeasureSpec);
    setMeasuredDimension(container.getMeasuredWidth(), container.getMeasuredHeight());
}

FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:472)
at android.view.View.measure(View.java:12603)
at nu.style.RadioView.onMeasure(RadioView.java:84)
at android.view.View.measure(View.java:12603)
at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1196)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:555)
at android.view.View.measure(View.java:12603)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
at android.view.View.measure(View.java:12603)
at android.widget.ScrollView.measureChildWithMargins(ScrollView.java:1163)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at android.widget.ScrollView.onMeasure(ScrollView.java:312)
at android.view.View.measure(View.java:12603)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376)
at android.view.View.measure(View.java:12603)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at android.view.View.measure(View.java:12603)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:660)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:553)
at android.view.View.measure(View.java:12603)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4677)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:293)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2072)
at android.view.View.measure(View.java:12603)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1044)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2418)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4340)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)