我正在尝试将坐标(x，y(从ARCore应用程序(HelloAR(绘制到视图。 我不想直接借鉴来自ARCore示例的GLSurfaceView。
所以我正在尝试走这个网站上提到的第一种方式：
Layered SurfaceViews in a FrameLayout in Android
可悲的是，我收到此运行时错误：
Binary XML file line #47: Error inflating class
com.google.ar.core.examples.java.helloar.MyView
这是我的视图类(互联网示例(：
package com.google.ar.core.examples.java.helloar;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
public class MyView extends View {
public MyView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int x = getWidth();
int y = getHeight();
int radius;
radius = 100;
Paint paint = new Paint();
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
canvas.drawPaint(paint);
// Use Color.parseColor to define HTML colors
paint.setColor(Color.parseColor("#CD5C5C"));
canvas.drawCircle(x / 2, y / 2, radius, paint);
}
}
这是XML：
<android.opengl.GLSurfaceView
android:id="@+id/surfaceview"
android:layout_width="fill_parent"
android:layout_height="460dp"
android:layout_gravity="top"
android:visibility="visible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent" />
<com.google.ar.core.examples.java.helloar.MyView
android:id="@+id/view"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="16dp"
android:visibility="gone"
app:layout_constraintBottom_toTopOf="@+id/surfaceview"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toEndOf="@+id/messageView"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"/>
.
.
(编辑(错误日志：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.google.ar.core.examples.java.helloar, PID: 1674
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.google.ar.core.examples.java.helloar/com.google.ar.core.examples.java.helloar.HelloArActivity}: android.view.InflateException: Binary XML file line #48: Binary XML file line #48: Error inflating class com.google.ar.core.examples.java.helloar.MyView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: android.view.InflateException: Binary XML file line #48: Binary XML file line #48: Error inflating class com.google.ar.core.examples.java.helloar.MyView
Caused by: android.view.InflateException: Binary XML file line #48: Error inflating class com.google.ar.core.examples.java.helloar.MyView
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
at java.lang.Class.getConstructor0(Class.java:2320)
at java.lang.Class.getConstructor(Class.java:1725)
at android.view.LayoutInflater.createView(LayoutInflater.java:615)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:790)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:863)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at com.google.ar.core.examples.java.helloar.HelloArActivity.onCreate(HelloArActivity.java:140)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
我希望有人可以帮助我。 解决方法也很棒。
此致敬意
我找到了解决方案：缺少属性集参数。
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
}