向Android Wear for canvas添加自定义视图
我正在尝试向Round Android Wear添加自定义视图,但从logcat收到以下错误:向Android Wear for canvas添加自定义视图,android,android-canvas,android-view,android-custom-view,wear-os,Android,Android Canvas,Android View,Android Custom View,Wear Os,我正在尝试向Round Android Wear添加自定义视图,但从logcat收到以下错误: 12-31 19:27:27.211 2212-2212/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.crashoveride007.roundwatchcanvas, PID: 2212
12-31 19:27:27.211 2212-2212/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.crashoveride007.roundwatchcanvas, PID: 2212
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.crashoveride007.roundwatchcanvas/com.example.crashoveride007.roundwatchcanvas.MainActivity}: android.view.InflateException: Binary XML file line #10: Error inflating class com.example.crashoveride007.roundwatchcanvas.MyView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.view.InflateException: Binary XML file line #10: Error inflating class com.example.crashoveride007.roundwatchcanvas.MyView
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 com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
at android.app.Activity.setContentView(Activity.java:2145)
at com.example.crashoveride007.roundwatchcanvas.MainActivity.onCreate(MainActivity.java:16)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
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 com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
at android.app.Activity.setContentView(Activity.java:2145)
at com.example.crashoveride007.roundwatchcanvas.MainActivity.onCreate(MainActivity.java:16)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
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:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
主要活动类别:
package com.example.crashoveride007.roundwatchcanvas;
import android.app.Activity;
import android.os.Bundle;
import android.support.wearable.view.WatchViewStub;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
private TextView mTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.round_activity_main);
final RelativeLayout main = (RelativeLayout) findViewById(R.id.roundWatch);
}
}
和round_活动的XML_main:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/roundWatch"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.crashoveride007.roundwatchcanvas.MainActivity"
tools:deviceIds="wear_round">
<com.example.crashoveride007.roundwatchcanvas.MyView
android:id="@+id/myView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
有人能帮我消除这个错误,并讨论如何在磨损活动中使用画布吗
谢谢。您需要提供额外的构造器,以便视图正确充气。您至少需要一个将
上下文
和属性集
作为参数的属性集,如下所示:
public MyView(Context context) {
this(context, null);
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
...
}
根据视图
文档,这个“第二个表单应该解析并应用布局文件中定义的任何属性。”
通常,您还应该覆盖另外两个标准的视图构造函数:
public MyView(Context context) {
this(context, null);
}
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
...
}