[英]How to combine two Views?
I want to see on the screen both a button and a circle(drawing with canvas).But I can't do this , Especially in XML file seen good but when I send APK to my phone this error come : 我想在屏幕上同时看到一个按钮和一个圆圈(用画布绘制)。但是我无法做到这一点,特别是在XML文件中看的很好,但是当我将APK发送到手机时,会出现以下错误:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mehmet.catchtheball/com.example.mehmet.catchtheball.Customer}: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class com.example.mehmet.catchtheball.MyView java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.mehmet.catchtheball / com.example.mehmet.catchtheball.Customer}:android.view.InflateException:二进制XML文件行#0:二进制XML文件行0 :错误膨胀类com.example.mehmet.catchtheball.MyView
my activity_customer.xml
showing screenshot : enter image description here 显示截图的我的
activity_customer.xml
: 在此处输入图像描述
(Shortly ,I want this showing on my phone too.) (很快,我也想在手机上显示此内容。)
MyView.java file:
package com.example.mehmet.catchtheball;
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);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.WHITE);
canvas.drawPaint(paint);
paint.setColor(Color.parseColor("lightGray"));
canvas.drawCircle(500, 500, 150, paint);
}
}
Customer.java
file : Customer.java
文件:
package com.example.mehmet.catchtheball;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
public class Customer extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_customer);
MyView a = new MyView(this); //create a circle
a.setOnTouchListener(new View.OnTouchListener() {
public boolean onTouch(View view, MotionEvent motionEvent) {
return true;
}
});
}
}
activity_customer.xml
file : activity_customer.xml
文件:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeLayout"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.mehmet.catchtheball.main">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:text="@string/button" />
<RelativeLayout
android:id="@+id/relativeLayoutt"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true">
</RelativeLayout>
<com.example.mehmet.catchtheball.MyView
android:id="@+id/view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
You have to implement the following Constructors in your MyView class 您必须在MyView类中实现以下构造方法
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
Your class should look like as below:- 您的课程应如下所示:-
public class MyView extends View {
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public MyView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public MyView(Context context) {
super(context);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.WHITE);
canvas.drawPaint(paint);
paint.setColor(Color.parseColor("lightGray"));
canvas.drawCircle(500, 500, 150, paint);
}
}
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