【发布时间】：2020-07-18 14:11:36
【问题描述】：
我在使用自定义视图时遇到问题，当我创建自定义视图时我的应用程序崩溃了，当我看到日志时 我在使用自定义视图的 XML 文件中查看错误，但无法解决问题。 当我想使用 xmlns:custom="http://schemas.android.com/apk/com.zeroone.customview2" 发生错误，Android Studio 显示此消息： 在 Gradle 项目中，始终使用 http://schemas.android.com/apk/res-auto 来自定义属性
我不知道我的问题是什么，如果你知道请帮助我
这是 activity_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.zeroone.customview2.CustomView
android:layout_width="match_parent"
android:layout_height="match_parent"
custom:rect_color="#BC7C33"
custom:text_color="#0AD6C2"
custom:mText="@string/app_name"/>
</RelativeLayout>
这是 attrs.xml ：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="CustomView">
<attr name="rect_color" format="color"/>
<attr name="text_color" format="color"/>
<attr name="mText" format="string"/>
<attr name="image" format="reference"/>
<attr name="text_size" format="dimension"/>
<attr name="padding" format="dimension"/>
</declare-styleable>
</resources>
这是 CustomView.kt
import android.content.Context
import android.content.res.Resources
import android.content.res.TypedArray
import android.graphics.*
import android.util.AttributeSet
import android.view.View
class CustomView(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) :
View(context, attrs, defStyleAttr) {
private var mColor: Int = Color.GREEN
private var mColorText: Int = Color.RED
private var image = R.drawable.ic_launcher_background
private var padding = 0f
set(value) {
field = value
invalidate()
}
private var mText = "Hello"
init {
val a: TypedArray =
context!!.obtainStyledAttributes(attrs, R.styleable.CustomView, defStyleAttr, 0)
try {
mColor = a.getColor(R.styleable.CustomView_rect_color, Color.BLUE)
mColorText = a.getColor(R.styleable.CustomView_text_color, Color.WHITE)
mText = a.getString(R.styleable.CustomView_mText)!!
image = a.getResourceId(R.styleable.CustomView_image , R.drawable.ic_launcher_background)
padding = a.getDimension(R.styleable.CustomView_padding, 0f)
} finally {
a.recycle()
}
}
override fun onDraw(canvas: Canvas?) {
super.onDraw(canvas)
val paint = Paint().apply {
isAntiAlias = true
color = mColor
style = Paint.Style.FILL
textSize = dp2f(15f)
textAlign = Paint.Align.CENTER
}
val paint2 = Paint().apply {
isAntiAlias = true
color = Color.RED
style = Paint.Style.FILL
}
val rectF = RectF().apply {
left = 30f
top = 30f
right = 30f
bottom = 30f
}
val bitmap = BitmapFactory.decodeResource(null , image)
val viewWidthHalf = this.measuredWidth / 2
val viewHeightHalf = this.measuredHeight / 2
var radius = 0
radius = if (viewWidthHalf > viewHeightHalf) viewHeightHalf - 10 else viewWidthHalf - 10
canvas!!.drawCircle(
viewWidthHalf.toFloat(),
viewHeightHalf.toFloat(),
radius.toFloat(),
paint
);
paint.color = mColorText
canvas.drawText(mText, viewWidthHalf.toFloat(), viewHeightHalf.toFloat(), paint);
}
fun dp2f(flaot: Float): Float {
return Resources.getSystem().displayMetrics.density * flaot
}
}
这是日志：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.zeroone.customview2, PID: 24583
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zeroone.customview2/com.zeroone.customview2.MainActivity}: android.view.InflateException: Binary XML file line #9: Error inflating class com.zeroone.customview2.CustomView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2551)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2625)
at android.app.ActivityThread.access$700(ActivityThread.java:183)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1484)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5667)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:962)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class com.zeroone.customview2.CustomView
at android.view.LayoutInflater.createView(LayoutInflater.java:616)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.zeroone.customview2.MainActivity.onCreate(MainActivity.kt:9)
at android.app.Activity.performCreate(Activity.java:6147)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2498)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2625)
at android.app.ActivityThread.access$700(ActivityThread.java:183)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1484)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5667)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:962)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
at java.lang.Class.getConstructor(Class.java:531)
at java.lang.Class.getConstructor(Class.java:495)
at android.view.LayoutInflater.createView(LayoutInflater.java:580)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:743)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.zeroone.customview2.MainActivity.onCreate(MainActivity.kt:9)
at android.app.Activity.performCreate(Activity.java:6147)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2498)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2625)
at android.app.ActivityThread.access$700(ActivityThread.java:183)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1484)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5667)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:962)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
【问题讨论】：
标签： java android xml android-layout kotlin