必须使用MeasureSpec.EXACTLY excpetion测量运行时DrawerLayout

Question

我正在关注本教程,面对一个奇怪的问题.

不要紧,什么是我的DrawerLayout,但如果它layout_height还是layout_width被设置为硬编码的一些其他的东西,它会抛出此运行时异常.

我试图在图形布局工具中渲染输出时看到很多关于此错误的报告,但在运行时错误中找不到任何报告.

我有最新的支持库,刚刚更新到版本 21.0.2

如果可能的话,我想避免硬编码我的身高和宽度.

文件的开头看起来像这样.这样,它就会粉碎.

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

而堆栈跟踪是

12-04 00:57:51.051: E/AndroidRuntime(26254): FATAL EXCEPTION: main
12-04 00:57:51.051: E/AndroidRuntime(26254): Process: com.lablabla.homedestroyer, PID: 26254
12-04 00:57:51.051: E/AndroidRuntime(26254): java.lang.IllegalArgumentException: DrawerLayout must be measured with MeasureSpec.EXACTLY.
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:814)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.View.measure(View.java:17430)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.View.measure(View.java:17430)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.View.measure(View.java:17430)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.View.measure(View.java:17430)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1141)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.Choreographer.doCallbacks(Choreographer.java:580)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.Choreographer.doFrame(Choreographer.java:550)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.os.Handler.handleCallback(Handler.java:739)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.os.Handler.dispatchMessage(Handler.java:95)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.os.Looper.loop(Looper.java:135)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at android.app.ActivityThread.main(ActivityThread.java:5221)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at java.lang.reflect.Method.invoke(Native Method)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at java.lang.reflect.Method.invoke(Method.java:372)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
12-04 00:57:51.051: E/AndroidRuntime(26254):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

如果它必须是硬编码的,那么对于各种屏幕尺寸来说它是"正确"的最佳方法是什么？

Answer 1

尝试覆盖 DrawerLayout 的测量方法

public class CustomDrawerLayout extends DrawerLayout {

public CustomDrawerLayout(Context context) {
    super(context);
}

public CustomDrawerLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public CustomDrawerLayout(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    widthMeasureSpec = MeasureSpec.makeMeasureSpec(
            MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.EXACTLY);
    heightMeasureSpec = MeasureSpec.makeMeasureSpec(
            MeasureSpec.getSize(heightMeasureSpec), MeasureSpec.EXACTLY);
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

}