ClassNotFoundException的为Android应用程序定制的ImageView [英] ClassNotFoundException for custom ImageView in Android app

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本文介绍了ClassNotFoundException的为Android应用程序定制的ImageView的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我收到以下异常...

  08-12 14:19:41.564:ERROR / AndroidRuntime(797):抛出java.lang.ClassNotFoundException:com.widgets.utils.CustomRoundedCornerImageView装载机dalvik.system所致。 PathClassLoader [。]
 

我创建了一个自定义的ImageView即 com.widgets.utils.CustomRoundedCornerImageView ,并在布局XML使用它。该CustomRoundedCornerImageView.java是在类路径与其他类。

CustomRoundedCornerImageView.java

 包com.widgets.utils;

进口android.content.Context;
进口android.graphics.Bitmap;
进口android.graphics.Bitmap.Config;
进口android.graphics.Canvas;
进口android.graphics.Paint;
进口android.graphics.PorterDuff.Mode;
进口android.graphics.PorterDuffXfermode;
进口android.graphics.Rect;
进口android.graphics.RectF;
进口android.graphics.drawable.BitmapDrawable;
进口android.graphics.drawable.Drawable;
进口android.util.AttributeSet;
进口android.widget.ImageView;

公共类CustomRoundedCornerImageView扩展ImageView的{

    公共CustomRoundedCornerImageView(上下文的背景下){
        超(上下文);
    }
    公共CustomRoundedCornerImageView(上下文的背景下,ATTRS的AttributeSet){
        超(背景下,ATTRS);
    }

    公共CustomRoundedCornerImageView(上下文的背景下,ATTRS的AttributeSet,
            INT defStyle){
        超(背景下,ATTRS,defStyle);
    }


    @覆盖
    保护无效的OnDraw(帆布油画){
            可绘制绘制= getDrawable();

            位图B =((BitmapDrawable)可拉伸).getBitmap();
            点阵位图= b.copy(Bitmap.Config.ARGB_8888,真正的);

            位图roundBitmap = getRoundedCornerBitmap(位图,30);
            canvas.drawBitmap(roundBitmap,0,0,NULL);
    }

    公共静态位图getRoundedCornerBitmap(位图位图,诠释像素){
        位图roundedBitmap = Bitmap.createBitmap(bitmap.getWidth(),位图
                .getHeight(),Config.ARGB_8888);
        帆布油画=新的Canvas(roundedBitmap);

        最终诠释色= 0xff424242;
        最终的涂料粉刷=新的油漆();
        最终矩形矩形=新的Rect(0,0,bitmap.getWidth(),bitmap.getHeight());
        最后RectF rectF =新RectF(RECT);
        最终浮动roundPx =像素;

        paint.setAntiAlias​​(真正的);
        canvas.drawARGB(0,0,0,0);
            paint.setColor(颜色);
        canvas.drawRoundRect(rectF,roundPx,roundPx,油漆);

        paint.setXfermode(新PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(位图,矩形,矩形,油漆);

        返回roundedBitmap;
    }

}
 

layout.xml

 < LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
        机器人:ID =@ + ID / picture_frame
        机器人:layout_width =70px
        机器人:layout_height =70px
        机器人:重力=中心
        机器人:layout_marginTop =5像素
        机器人:layout_marginLeft =40PX
        机器人:可聚焦=假
        机器人:能见度=隐形
        机器人:背景=@可绘制/ picture_frame>
    < com.widgets.utils.CustomRoundedCornerImageView
            机器人:ID =@ + ID /图片
            机器人:layout_width =match_parent
            机器人:layout_height =match_parent
            机器人:scaleType =centerCrop
            机器人:可聚焦=FALSE/>
< / LinearLayout中>
 

你能不能帮我,为什么我得到了ClassNotFoundException?

解决方案

 < com.widgets.utils.CustomRoundedCornerImageView
        机器人:ID =@ + ID /图片
        机器人:layout_width =match_parent
        机器人:layout_height =match_parent
        机器人:scaleType =centerCrop
        机器人:可聚焦=FALSE/>
 

在此,你必须改变

 < ImageView的类=com.widgets.utils.CustomRoundedCornerImageView
        机器人:ID =@ + ID /图片
        机器人:layout_width =match_parent
        机器人:layout_height =match_parent
        机器人:scaleType =centerCrop
        机器人:可聚焦=FALSE/>
 

I am getting following exception...

08-12 14:19:41.564: ERROR/AndroidRuntime(797): Caused by: java.lang.ClassNotFoundException: com.widgets.utils.CustomRoundedCornerImageView in loader dalvik.system.PathClassLoader[.]

I have created a custom ImageView i.e. com.widgets.utils.CustomRoundedCornerImageView and using it in a layout xml . The CustomRoundedCornerImageView.java is in class path with other classes.

CustomRoundedCornerImageView.java

package com.widgets.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class CustomRoundedCornerImageView extends ImageView {

    public CustomRoundedCornerImageView(Context context) {
        super(context);
    }
    public CustomRoundedCornerImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomRoundedCornerImageView(Context context, AttributeSet attrs,
            int defStyle) {
        super(context, attrs, defStyle);
    }


    @Override
    protected void onDraw(Canvas canvas) {
            Drawable drawable = getDrawable();

            Bitmap b =  ((BitmapDrawable)drawable).getBitmap() ;
            Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);

            Bitmap roundBitmap = getRoundedCornerBitmap(bitmap,30);
            canvas.drawBitmap(roundBitmap, 0,0 , null);
    }

    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) {
        Bitmap roundedBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap
                .getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(roundedBitmap);

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);
        final float roundPx = pixels;

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
            paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return roundedBitmap;
    }

}

layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/picture_frame"
        android:layout_width="70px"
        android:layout_height="70px"
        android:gravity="center"
        android:layout_marginTop="5px"
        android:layout_marginLeft="40px"
        android:focusable="false"
        android:visibility="invisible"
        android:background="@drawable/picture_frame">
    <com.widgets.utils.CustomRoundedCornerImageView 
            android:id="@+id/picture"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="centerCrop"
            android:focusable="false" />
</LinearLayout>

Can you help me why I am getting ClassNotFoundException ?

解决方案

<com.widgets.utils.CustomRoundedCornerImageView 
        android:id="@+id/picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        android:focusable="false" />

in this you have to change

<ImageView class="com.widgets.utils.CustomRoundedCornerImageView" 
        android:id="@+id/picture"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        android:focusable="false" />

这篇关于ClassNotFoundException的为Android应用程序定制的ImageView的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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