android半圆圆环

Ⅰ android 怎么画一个半圆

shape可以设置某一个角圆角,但实现你这个估计不行,你可以叫美工绘制一个,带java代码里面进行控制替换

Ⅱ Android中一圆环图片，圆环上某一圈坐标点算出来，获取图片上的像素值，报错

public void getPixColor(int imhg){
Bitmap src = BitmapFactory.decodeResource(getResources(),imhg);
int A, R, G, B;
int pixelColor;
int height = src.getHeight();
int width = src.getWidth();

for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
pixelColor = src.getPixel(x, y);
A = Color.alpha(pixelColor);
R = Color.red(pixelColor);
G = Color.green(pixelColor);
B = Color.blue(pixelColor);
if (R>0||G>0||B>0){
tv_tilte2.setTextColor(Color.rgb(R,G, B));
}

}
}

}

Ⅲ Android中绘制一条圆弧，但是圆弧两头要是一个半圆，请问这怎么做

paint.setStrokeCap(Paint.Cap.ROUND);

Ⅳ 求教 android半圆弧形的进度条问题

package com.example.comt;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.View;

public class CircleView extends View {

Paint paint,textpaint;
RectF area;
int value = 100;
LinearGradient shader;

public CircleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
// TODO Auto-generated constructor stub
}

public CircleView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
// TODO Auto-generated constructor stub
}

public CircleView(Context context) {
super(context);
init();
// TODO Auto-generated constructor stub
}

public void setProgress(int value){
this.value = value;
invalidate();
}

public void init() {
paint = new Paint();
paint.setStrokeWidth(50f);
paint.setColor(Color.WHITE);
paint.setStyle(Style.STROKE);
paint.setAntiAlias(true);
textpaint = new Paint();
textpaint.setTextSize(50f);
textpaint.setColor(Color.WHITE);
area = new RectF(100, 100, 500, 500);

shader =new LinearGradient(0, 0, 400, 0, new int[] {
Color.BLUE, Color.WHITE}, null,
Shader.TileMode.CLAMP);
paint.setShader(shader);

}

@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
canvas.drawColor(Color.GRAY);
canvas.drawArc(area, 120, 360*value/100 , false, paint);
canvas.drawText(value+"%", 270, 290, textpaint);
}

}

看下是不是你想要的，调用setprogress()既可调节圆环

Ⅳ android 怎样用shape画一个俩边半圆的按钮背景

用shape画一个俩边半圆的按钮，可以用图形画。
Circle方法用来画圆、椭圆、圆弧和饼分图。
画圆，Visual Basic需要给出这个圆的圆心位置和它的半径：“对象. Circle Step (x, y)，半径，颜色”。
如果不指定对象，指定的就是当前的窗体。
用绘图区的标尺属性，可以使圆心置于绘图区域的中心处。

Ⅵ 安卓手机上的环形快捷图标是什么意思

你是指右下角那个环形的键吗？那个是返回的意思

Ⅶ android 类似进度圆环的是怎么做的

自定义的view，可以看一下，调用的onDraw方法。

packagecom.cn.myvn;

importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.graphics.Paint;
importandroid.util.AttributeSet;
importandroid.view.View;

{

privatefinalPaintpaint;
privatefinalContextcontext;

publicRingView(Contextcontext){

//TODOAuto-generatedconstructorstub
this(context,null);
}

publicRingView(Contextcontext,AttributeSetattrs){
super(context,attrs);
//TODOAuto-generatedconstructorstub
this.context=context;
this.paint=newPaint();
this.paint.setAntiAlias(true);//消除锯齿
this.paint.setStyle(Paint.Style.STROKE);//绘制空心圆
}

@Override
protectedvoidonDraw(Canvascanvas){
//TODOAuto-generatedmethodstub
intcenter=getWidth()/2;
intinnerCircle=dip2px(context,83);//设置内圆半径
intringWidth=dip2px(context,5);//设置圆环宽度

//绘制内圆
this.paint.setARGB(155,167,190,206);
this.paint.setStrokeWidth(2);
canvas.drawCircle(center,center,innerCircle,this.paint);

//绘制圆环
this.paint.setARGB(255,212,225,233);
this.paint.setStrokeWidth(ringWidth);
canvas.drawCircle(center,center,innerCircle+1+ringWidth/2,this.paint);

//绘制外圆
this.paint.setARGB(155,167,190,206);
this.paint.setStrokeWidth(2);
canvas.drawCircle(center,center,innerCircle+ringWidth,this.paint);

super.onDraw(canvas);
}
}