画圆android,画圆的方法素描

android 里用shape画圆，怎么填充颜色

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shape xmlns:android=""

!-- 圆角 --

corners

android:radius="9dp"

android:topLeftRadius="2dp"

android:topRightRadius="2dp"

android:bottomLeftRadius="2dp"

android:bottomRightRadius="2dp"/!-- 设置圆角半径 --

!-- 渐变 --

gradient

android:startColor="@android:color/white"

android:centerColor="@android:color/black"

android:endColor="@android:color/black"

android:useLevel="true"

android:angle="45"

android:type="radial"

android:centerX="0"

android:centerY="0"

android:gradientRadius="90"/

!-- 间隔 --

padding

android:left="2dp"

android:top="2dp"

android:right="2dp"

android:bottom="2dp"/!-- 各方向的间隔 --

!-- 大小 --

size

android:width="50dp"

android:height="50dp"/!-- 宽度和高度 --

!-- 填充 --

solid

android:color="@android:color/white"/!-- 填充的颜色 --

!-- 描边 --

stroke

android:width="2dp"

android:color="@android:color/black"

android:dashWidth="1dp"

android:dashGap="2dp"/

/shape

android 百度地图上怎么画线，画圆

//代码如下

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.Path;

import android.graphics.Point;

import android.os.Bundle;

import com.baidu.mapapi.BMapManager;

import com.baidu.mapapi.GeoPoint;

import com.baidu.mapapi.MapActivity;

import com.baidu.mapapi.MapController;

import com.baidu.mapapi.MapView;

import com.baidu.mapapi.Overlay;

import com.baidu.mapapi.Projection;

public class BaiduMapActivity extends MapActivity {

private Context mContext;

private MapView mapView;

@Override

protected boolean isRouteDisplayed() {

// TODO Auto-generated method stub

return false;

}

private GeoPoint gpoint1, gpoint2, gpoint3;// 连线的点

@Override

protected void onCreate(Bundle arg0) {

super.onCreate(arg0);

setContentView(R.layout.baidumap_layout);

BaseApplication baseApp = (BaseApplication) this.getApplication();

if (baseApp.mBMapManage == null) {

baseApp.mBMapManage = new BMapManager(mContext);

baseApp.mBMapManage.init(baseApp.mStrKey,

new BaseApplication.MyGeneralListener());

}

baseApp.mBMapManage.start();

super.initMapActivity(baseApp.mBMapManage);// 初始化map sdk

mapView = (MapView) findViewById(R.id.bmapView);

mapView.setBuiltInZoomControls(true);

// 设置在缩放动画过程中也显示overlay,默认为不绘制

mapView.setDrawOverlayWhenZooming(true);

// RouteLine routeLine =

// (RouteLine)getIntent().getSerializableExtra("routeLine");

//这里画点和连接线

MyOverlay myOverlay = new MyOverlay();

mapView.getOverlays().add(myOverlay);

MapController mapController = mapView.getController();

mapController.zoomIn();

gpoint1 = new GeoPoint((int) (2259316 * 10),

(int) (11396279 * 10));

gpoint2 = new GeoPoint((int) (2259245 * 10),

(int) (11396226 * 10));

gpoint3 = new GeoPoint((int) (2259121 * 10),

(int) (11396066 * 10));

mapController.animateTo(gpoint1);//设置一个起点

}

class MyOverlay extends Overlay {

@Override

public void draw(Canvas canvas, MapView mapView, boolean shadow) {

super.draw(canvas, mapView, shadow);

Projection projection = mapView.getProjection();

Point p1 = new Point();

Point p2 = new Point();

Point p3 = new Point();

// 经度转像素

projection.toPixels(gpoint1, p1);

projection.toPixels(gpoint2, p2);

projection.toPixels(gpoint3, p3);

//第一个画笔画圆

Paint fillPaint = new Paint();

fillPaint.setColor(Color.BLUE);

fillPaint.setAntiAlias(true);

fillPaint.setStyle(Style.FILL);

// 将图画到上层

canvas.drawCircle(p1.x, p1.y, 5.0f, fillPaint);

canvas.drawCircle(p2.x, p2.y, 5.0f, fillPaint);

canvas.drawCircle(p3.x, p3.y, 5.0f, fillPaint);

//第二个画笔画线

Paint paint = new Paint();

paint.setColor(Color.BLUE);

paint.setDither(true);

paint.setStyle(Paint.Style.STROKE);

paint.setStrokeJoin(Paint.Join.ROUND);

paint.setStrokeCap(Paint.Cap.ROUND);

paint.setStrokeWidth(4);

//连接

Path path = new Path();

path.moveTo(p1.x, p1.y);

path.lineTo(p2.x, p2.y);

path.lineTo(p3.x, p3.y);

//画出路径

canvas.drawPath(path, paint);

}

android 能在bitmap上绘制圆吗

能，这是往图片（图片转为Bitmap）上写入文字、图片，你换成画圆就是得了。

/**

* 往图片上写入文字、图片等内容

private void drawNewBitmap(String str) {

Bitmap photo = BitmapFactory.decodeResource(this.getResources(),R.drawable.introduce_first);

int width = photo.getWidth();

int hight = photo.getHeight();

Bitmap bitmap = Bitmap.createBitmap(width, hight, Bitmap.Config.ARGB_8888); // 建立一个空的BItMap

Canvas canvas = new Canvas(bitmap);// 初始化画布绘制的图像到icon上

Paint photoPaint = new Paint(); // 建立画笔

photoPaint.setDither(true); // 获取跟清晰的图像采样

photoPaint.setFilterBitmap(true);// 过滤一些

Rect src = new Rect(0, 0, photo.getWidth(), photo.getHeight());// 创建一个指定的新矩形的坐标

Rect dst = new Rect(0, 0, width, hight);// 创建一个指定的新矩形的坐标

canvas.drawBitmap(photo, src, dst, photoPaint);// 将photo 缩放或则扩大到

// dst使用的填充区photoPaint

Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);// 设置画笔

textPaint.setTextSize(30.0f);// 字体大小

textPaint.setTypeface(Typeface.DEFAULT_BOLD);// 采用默认的宽度

textPaint.setColor(Color.BLACK);// 采用的颜色

canvas.drawText(str, 200, 200, textPaint);// 绘制上去字，开始未知x,y采用那只笔绘制

canvas.drawBitmap(BitmapFactory.decodeResource(this.getResources(),R.drawable.ic_launcher), 100, 100, textPaint);

canvas.save(Canvas.ALL_SAVE_FLAG);

canvas.restore();

iv.setBackgroundDrawable(new BitmapDrawable(this.getResources(), bitmap));

saveMyBitmap(bitmap,"test1");

}

android如何在屏幕点击位置画一个小圆

主要运用SurfaceView来实现在屏幕上画一个圆，你可以通过按方向键和触摸屏幕来改变圆的位置

代码：

Activity

package com.view;

import android.app.Activity;

import android.os.Bundle;

import android.view.Window;

import android.view.WindowManager;

public class MainActivity extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

// 隐藏状态栏

this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,

WindowManager.LayoutParams.FLAG_FULLSCREEN);

// 把Activity的标题去掉

requestWindowFeature(Window.FEATURE_NO_TITLE);

// 设置布局

this.setContentView(new MySurfaceView(this));

}

SurfaceView

package com.view;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.view.KeyEvent;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceHolder.Callback;

import android.view.SurfaceView;

public class MySurfaceView extends SurfaceView implements Runnable, Callback {

private SurfaceHolder mHolder; // 用于控制SurfaceView

private Thread t; // 声明一条线程

private boolean flag; // 线程运行的标识，用于控制线程

private Canvas mCanvas; // 声明一张画布

private Paint p; // 声明一支画笔

private int x = 50, y = 50, r = 10; // 圆的坐标和半径

public MySurfaceView(Context context) {

super(context);

mHolder = getHolder(); // 获得SurfaceHolder对象

mHolder.addCallback(this); // 为SurfaceView添加状态监听

p = new Paint(); // 创建一个画笔对象

p.setColor(Color.WHITE); // 设置画笔的颜色为白色

setFocusable(true); // 设置焦点

}

/**

* 自定义一个方法，在画布上画一个圆

public void Draw() {

mCanvas = mHolder.lockCanvas(); // 获得画布对象，开始对画布画画

mCanvas.drawRGB(0, 0, 0); // 把画布填充为黑色

mCanvas.drawCircle(x, y, r, p); // 画一个圆

mHolder.unlockCanvasAndPost(mCanvas); // 完成画画，把画布显示在屏幕上

}

/**

* 当SurfaceView创建的时候，调用此函数

@Override

public void surfaceCreated(SurfaceHolder holder) {

t = new Thread(this); // 创建一个线程对象

flag = true; // 把线程运行的标识设置成true

t.start(); // 启动线程

}

/**

* 当SurfaceView的视图发生改变的时候，调用此函数

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

}

/**

* 当SurfaceView销毁的时候，调用此函数

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

flag = false; // 把线程运行的标识设置成false

}

/**

* 当屏幕被触摸时调用

@Override

public boolean onTouchEvent(MotionEvent event) {

x = (int) event.getX(); // 获得屏幕被触摸时对应的X轴坐标

y = (int) event.getY(); // 获得屏幕被触摸时对应的Y轴坐标

return true;

}

/**

* 当用户按键时调用

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

if(keyCode == KeyEvent.KEYCODE_DPAD_UP){ //当用户点击↑键时

y--; //设置Y轴坐标减1

}

return super.onKeyDown(keyCode, event);

}

@Override

public void run() {

while (flag) {

Draw(); // 调用自定义画画方法

try {

Thread.sleep(50); // 让线程休息50毫秒

} catch (InterruptedException e) {

e.printStackTrace();

}

MySurfaceView首先继承SurfaceView，然后实现Runnable和Callback接口

重写了Runnable的run方法和Callback的surfaceCreated(SurfaceHolder holder)，surfaceChanged(SurfaceHolder holder, int format, int width,int height)，surfaceDestroyed(SurfaceHolder holder)方法，

还实现了onTouchEvent(MotionEvent event)，onKeyDown(int keyCode, KeyEvent event)方法来，详细的在代码里已注释。

Android开发,怎样做一个画圆圈的动画效果

画圆应该很简单，自动循环的话，你就每隔一段时间刷新一下view

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画圆android,画圆的方法素描

android 里用shape画圆，怎么填充颜色

android 百度地图上怎么画线，画圆

android 能在bitmap上绘制圆吗

android如何在屏幕点击位置画一个小圆

Android开发,怎样做一个画圆圈的动画效果

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