从 XML 膨胀自定义视图会创建 Illegalstateexception(Android, Java)
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【中文标题】从 XML 膨胀自定义视图会创建 Illegalstateexception(Android, Java)【英文标题】：Inflating custom view from XML creates Illegalstateexception(Android, Java) 【发布时间】：2011-05-22 14:05:56 【问题描述】：我已经在一些恼人的运行时异常上停留了大约 12 个小时，当我尝试扩展我创建的自定义视图时，这种异常一直在发生。这是我的第一个 android（和 Java）程序，所以希望我没有做一些非常愚蠢的事情。
XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:padding="10px" >
<com.studentfees.GraphView/>
</RelativeLayout>
类：
public class GraphView extends View
Paint paint = new Paint();
Boolean IsTouched = false;
float TouchCoords[] = new float[2];
public enum GraphType Earnings, Payments, TotalPaid, NoneSet;
GraphType graphtype = GraphType.NoneSet;
Graph graph = new Graph();
Button ButtonLeft;
Button ButtonCentre;
Button ButtonRight;
public GraphView(Context context, AttributeSet attrs)
super(context, attrs);
graphtype = GraphType.Earnings;
paint.setColor(Color.BLACK);
paint.setAntiAlias(true);
paint.setStrokeWidth(5);
@Override
public boolean onTouchEvent(MotionEvent event)
IsTouched = true;
TouchCoords[0] = event.getX();
TouchCoords[1] = event.getY();
this.invalidate();
return super.onTouchEvent(event);
@Override
public void onDraw(Canvas canvas)
GraphSetUp(canvas);
TouchHandler(canvas);
ButtonSetUp();
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
private void ButtonSetUp()
private void TouchHandler(Canvas canvas)
if(IsTouched)
IsTouched = false;
canvas.drawCircle(TouchCoords[0], TouchCoords[1],10, paint);
private void GraphSetUp(Canvas canvas)
graph.DrawAxis(canvas, this);
switch(graphtype)
case Earnings: graph.LineCoords = Coordinate.ToCoordArray(studentfeesproject.student.ListofEarnings); break;
case Payments: graph.LineCoords = Coordinate.ToCoordArray(studentfeesproject.student.ListofPayments); break;
case TotalPaid: graph.LineCoords = graph.ToHistogram(Coordinate.ToCoordArray(studentfeesproject.student.ListofPayments)); break;
default: break;
graph.LineCoords = graph.CoordsToGraph(graph.LineCoords);
graph.DrawLineOnGraph(canvas);
日志：
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): FATAL EXCEPTION: main
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): java.lang.IllegalStateException: Could not execute method of the activity
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.View$1.onClick(View.java:2082)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.View.performClick(View.java:2461)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.View$PerformClick.run(View.java:8888)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.os.Handler.handleCallback(Handler.java:587)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.os.Handler.dispatchMessage(Handler.java:92)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.os.Looper.loop(Looper.java:123)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at java.lang.reflect.Method.invokeNative(Native Method)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at java.lang.reflect.Method.invoke(Method.java:521)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at dalvik.system.NativeStart.main(Native Method)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): Caused by: java.lang.reflect.InvocationTargetException
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at com.studentfees.studentfeesproject.GetResults(studentfeesproject.java:51)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at java.lang.reflect.Method.invokeNative(Native Method)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at java.lang.reflect.Method.invoke(Method.java:521)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.View$1.onClick(View.java:2077)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): ... 11 more
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): Caused by: java.lang.RuntimeException: Binary XML file line #10: You must supply a layout_width attribute.
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:491)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:3592)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:3672)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.widget.RelativeLayout$LayoutParams.<init>(RelativeLayout.java:1047)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.widget.RelativeLayout.generateLayoutParams(RelativeLayout.java:917)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.widget.RelativeLayout.generateLayoutParams(RelativeLayout.java:66)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.LayoutInflater.rInflate(LayoutInflater.java:620)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.LayoutInflater.inflate(LayoutInflater.java:382)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:200)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.app.Activity.setContentView(Activity.java:1647)
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): ... 15 more
+++++++++++++ +++++++++++++ +++++++++++++
编辑：
第一次回答后的新日志 - 感谢您的帮助 inazaruk：
05-22 16:02:23.055: WARN/dalvikvm(13186): threadid=1: thread exiting with uncaught exception (group=0x4001d7d0)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): FATAL EXCEPTION: main
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): java.lang.NullPointerException
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at com.studentfees.Graph.CoordsToGraph(Graph.java:81)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at com.studentfees.GraphView.GraphSetUp(GraphView.java:93)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at com.studentfees.GraphView.onDraw(GraphView.java:55)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.View.draw(View.java:6793)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.View.draw(View.java:6796)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.widget.FrameLayout.draw(FrameLayout.java:354)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.View.draw(View.java:6796)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.widget.FrameLayout.draw(FrameLayout.java:354)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1894)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewRoot.draw(ViewRoot.java:1432)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewRoot.performTraversals(ViewRoot.java:1174)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.view.ViewRoot.handleMessage(ViewRoot.java:1752)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.os.Handler.dispatchMessage(Handler.java:99)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.os.Looper.loop(Looper.java:123)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at java.lang.reflect.Method.invokeNative(Native Method)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at java.lang.reflect.Method.invoke(Method.java:521)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
05-22 16:02:23.071: ERROR/AndroidRuntime(13186): at dalvik.system.NativeStart.main(Native Method)
【问题讨论】：
【参考方案1】：从您的日志中：
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): Caused by: java.lang.RuntimeException: Binary XML file line #10: You must supply a layout_width attribute.
05-22 13:57:04.028: ERROR/AndroidRuntime(10594): at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:491)
您必须指定layout_width 和layout_height：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_
android:layout_
android:padding="10px" >
<com.studentfees.GraphView
android:layout_
android:layout_ />
</RelativeLayout>
通常您必须为布局内的所有项目指定layout_width 和layout_height。在某些情况下，这是可选的，但有据可查。
现在您的应用程序由于另一个原因而失败：NullPointerException。它发生在您的GraphSetUp 函数中：
switch(graphtype)
case Earnings: graph.LineCoords = Coordinate.ToCoordArray(studentfeesproject.student.ListofEarnings); break;
case Payments: graph.LineCoords = Coordinate.ToCoordArray(studentfeesproject.student.ListofPayments); break;
【讨论】：
已添加布局参数但仍然遇到同样的问题:( 你得到完全相同的日志吗？可以为您的问题添加新日志吗？以上是关于从 XML 膨胀自定义视图会创建 Illegalstateexception(Android, Java)的主要内容，如果未能解决你的问题，请参考以下文章