本文介绍了如何在Android中创建一个半圆的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
我想创建一个半圆形/圆形的imageview.下面是我用来创建圆形图像视图的代码,但是我无法创建一个半圆形图像(半圆形)
I want to create a Semi-circle/rounded imageview. Below is the code which i use to create a rounded imageview but i am unable to create a semi-rounded image (semi-circle)
package com.example.dynamicviews;
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Shader;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;
/**
* Customized Imageview with Rounded Border and Shadow
* @author Rahul Gupta <[email protected]>
* @since 2014-01-01
*/
public class RoundedImageView extends ImageView
{
private int borderWidth = 2;
private int viewWidth;
private int viewHeight;
private Bitmap image;
private Paint paint;
private Paint paintBorder;
private BitmapShader shader;
public RoundedImageView(Context context)
{
super(context);
setup();
}
public RoundedImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
setup();
}
public RoundedImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
setup();
}
/**
* Custom Class to round imageview with color
* @param context Context of the activity
* @param borderColor Border color to be set
*/
@SuppressLint("NewApi")
public RoundedImageView(Context context, String borderColor) {
super(context);
// init paint
paint = new Paint();
paint.setAntiAlias(true);
paintBorder = new Paint();
setBorderColor(Color.WHITE);
paintBorder.setAntiAlias(true);
this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
paintBorder.setShadowLayer(3.0f, 0.0f,1.0f, Color.parseColor(borderColor));
}
@SuppressLint("NewApi")
private void setup()
{
// init paint
paint = new Paint();
paint.setAntiAlias(true);
paintBorder = new Paint();
setBorderColor(Color.WHITE);
paintBorder.setAntiAlias(true);
this.setLayerType(LAYER_TYPE_SOFTWARE, paintBorder);
paintBorder.setShadowLayer(3.0f, 0.0f,1.0f, Color.BLACK);
loadBitmap();
}
public void setBorderWidth(int borderWidth)
{
this.borderWidth = borderWidth;
this.invalidate();
}
public void setBorderColor(int borderColor)
{
if (paintBorder != null)
paintBorder.setColor(borderColor);
this.invalidate();
}
private void loadBitmap()
{
BitmapDrawable bitmapDrawable = (BitmapDrawable) this.getDrawable();
if (bitmapDrawable != null)
image = bitmapDrawable.getBitmap();
}
@SuppressLint("DrawAllocation")
@Override
public void onDraw(Canvas canvas)
{
// load the bitmap
// init shader
if (image != null)
{
shader = new BitmapShader(Bitmap.createScaledBitmap(image, canvas.getWidth(), canvas.getHeight(), false), Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
paint.setShader(shader);
int circleCenter = viewWidth / 2;
// circleCenter is the x or y of the view's center
// radius is the radius in pixels of the cirle to be drawn
// paint contains the shader that will texture the shape
canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter + borderWidth - 4.0f, paintBorder);
canvas.drawCircle(circleCenter + borderWidth, circleCenter + borderWidth, circleCenter - 4.0f, paint);
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int width = measureWidth(widthMeasureSpec);
int height = measureHeight(heightMeasureSpec, widthMeasureSpec);
viewWidth = width - (borderWidth * 2);
viewHeight = height - (borderWidth * 2);
setMeasuredDimension(width, height);
}
private int measureWidth(int measureSpec)
{
int result = 0;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY)
{
// We were told how big to be
result = specSize;
}
else
{
// Measure the text
result = viewWidth;
}
return result;
}
private int measureHeight(int measureSpecHeight, int measureSpecWidth)
{
int result = 0;
int specMode = MeasureSpec.getMode(measureSpecHeight);
int specSize = MeasureSpec.getSize(measureSpecHeight);
if (specMode == MeasureSpec.EXACTLY)
{
// We were told how big to be
result = specSize;
}
else
{
// Measure the text (beware: ascent is a negative number)
result = viewHeight;
}
return (result + 2);
}
}
这是它的屏幕截图:-
Here is the screenshot for it :-
所需的结果如下所示:-两个imageview的左半圈和右半圈之间有图像资源:-
推荐答案
尝试一下
<shape xmlns:android="http//schemas.android.com/apk/res/android"
android:shape="semicircle">
<solid android:background="@drawable/yourimage" />
<size android:width="60dp"
android:height="40dp" />
</shape>
然后在您的班级中 id = shape
可以说
then in your class id = shape
lets say
Shape shape = (Shape) findViewById(R.id.shape);
shape.split(10dp , center);
这篇关于如何在Android中创建一个半圆的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!