需求：自定义环形图（饼图），实现2项数据配比显示;
效果图：
实现分析：
1.目录结构：
代码实现：
1. color.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- 饼图 -->
<color name="pie_progress_bank">#fd8f8b</color>
<color name="pie_progress_fund">#2999f9</color>
<color name="text_tag_bg">#aaaaaa</color>
<color name="text_progress_bg">#fb4b45</color>
<color name="text_term_bg">#aaaaaa</color>
</resources>
2. fragment_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.jjc.demo.MainActivity$PlaceholderFragment" >
<com.jjc.demo.RingView
android:id="@+id/ringview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
3. RingView.java
package com.jjc.demo;
import java.math.BigDecimal;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Paint.Style;
import android.util.AttributeSet;
import android.view.View;
/**
* 当前环形图实现原理，先画一个完整环形，然后再画一部分环形，两者叠加，显示两种不同的配比；
* @author ThinkPad
*
*/
public class RingView extends View{
/** 当前进度 */
private int progress;
/** 总进度 */
private int max;
private Paint paint;
private RectF oval;
private int width;
private int height;
private String term = "";
/** 半径 */
private float radius;
/** 画笔宽度 */
private float paintWidth;
/** 组合字体 */
// private float tagTextSize;
/** 配比字体 */
private float progressTextSize;
// private float tagTextSize;
/** 期限字体 */
// private float termTextSize;
private double rate;
/**
* 设置总数
* @param max
*/
public void setMax(int max) {
this.max = max;
}
public void setPaintWidth(float paintWidth) {
this.paintWidth = paintWidth;
}
/**
* 设置进度
* @param progress
*/
public void setProgress(int progress) {
this.progress = progress;
invalidate();
}
/**
* 设置收益率
* @param rate
*/
public void setRate(double rate) {
this.rate = round(rate, 2, 4);
}
public void setTerm(String term) {
this.term = term;
}
public RingView(Context context, AttributeSet attrs) {
super(context, attrs);
paint = new Paint();
oval = new RectF();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
height = canvas.getHeight();
width = canvas.getWidth();
initRadius();
initPaint();
initDebugLine(canvas ,false);
initBankPaint(canvas);
initFundPaint(canvas);
initDescrip(canvas);
}
/**
* 测试文字是否居中,标尺线
*/
private void initDebugLine(Canvas canvas ,boolean isDebug) {
if(isDebug){
//竖线
paint.setColor(Color.BLACK); canvas.drawLine(width/2, 0, width/2, height, paint);
//横线
paint.setColor(Color.GRAY); canvas.drawLine(0, height/2, width, height/2, paint);
}
}
/**
* 比较高度和宽度，然后取短的作为圆环的半径
*/
private void initRadius() {
if (width > height) {
radius = (float) (height * 0.4);
} else {
radius = (float) (width * 0.4);
}
}
private void initPaint() {
if(paintWidth == 0){
paintWidth = radius/10;
}
paint.setAntiAlias(true);// 设置是否抗锯齿
paint.setFlags(Paint.ANTI_ALIAS_FLAG);// 帮助消除锯齿
}
private void initBankPaint(Canvas canvas) {
paint.setColor(getResources().getColor(R.color.pie_progress_bank));// 设置银行理财画笔
/** 银行理财标注 */
// 设置样式-填充
paint.setStyle(Style.FILL);
// 绘制一个矩形
canvas.drawRect(new Rect(10, height-35, 22, height-15), paint);
paint.setTextSize((float) (radius/5.5));// 设置标注文字的大小
canvas.drawText("银行理财", 35, height-18, paint);
/** 银行理财的饼图 */
paint.setStrokeWidth(paintWidth);// 设置画笔宽度
paint.setStyle(Style.STROKE);// 设置中空的样式
canvas.drawCircle(width / 2, height / 2, radius, paint);
}
private void initFundPaint(Canvas canvas) {
paint.setColor(getResources().getColor(R.color.pie_progress_fund));// 设置货币基金画笔
/** 货币基金标注 */
// 设置样式-填充
paint.setStyle(Style.FILL);
// 绘制一个矩形
canvas.drawRect(new Rect(10, height-65, 22, height-45), paint);
paint.setTextSize((float) (radius/5.5));// 设置标注文字的大小
canvas.drawText("货币基金", 35, height-48, paint);
/** 货币基金的饼图 */
paint.setStrokeWidth(paintWidth);// 设置画笔宽度
paint.setStyle(Style.STROKE);// 设置中空的样式
oval.set((width / 2 - radius), (height / 2 - radius),
(width / 2 + radius), (height / 2 + radius));
canvas.drawArc(oval, -90, ((float) progress / max) * 360, false, paint);// 画圆弧，第二个参数为：起始角度，第三个为跨的角度，第四个为true的时候是实心，false的时候为空心
}
private void initDescrip(Canvas canvas) {
paint.reset();// 将画笔重置
paint.setStrokeWidth(3);// 再次设置画笔的宽度
progressTextSize = (float) (radius / 2);
paint.setTextSize((float) (radius / 7));// 设置标记文字的大小
paint.setColor(getResources().getColor(R.color.text_tag_bg));// 设置画笔颜色
canvas.drawText("组合收益率", (float) (width / 2 - radius / 2.8),
(float) (height / 2 - progressTextSize * 0.5), paint);
paint.setTextSize((float) (radius / 7));// 设置期限文字的大小
paint.setColor(getResources().getColor(R.color.text_term_bg));// 设置画笔颜色
canvas.drawText(term, (float) (width / 2 - radius / 4.5),
(float) (height / 2 + progressTextSize * 0.7), paint);
/** 配比数 */
paint.setTextSize(progressTextSize);// 设置进度文字的大小
paint.setColor(getResources().getColor(R.color.text_progress_bg));// 设置画笔颜色
canvas.drawText(rate+"",
(float) (width / 2 - progressTextSize * 1.1),
(float) (height / 2 + progressTextSize / 2.5), paint);
paint.setTextSize((float) (radius / 5));// 设置百分号的大小
canvas.drawText("%",
(float) (width / 2 + progressTextSize * 0.9),
(float) (height / 2 + progressTextSize / 2.5), paint);
}
/**
* 对double数据进行取精度.
* <p>
* For example: <br>
* double value = 100.345678; <br>
* double ret = round(value,4,BigDecimal.ROUND_HALF_UP); <br>
* ret为100.3457 <br>
*
* @param value
* double数据.
* @param scale
* 精度位数(保留的小数位数).
* @param roundingMode
* 精度取值方式.
* @return 精度计算后的数据.
*/
private double round(double value, int scale, int roundingMode) {
BigDecimal bd = new BigDecimal(value);
bd = bd.setScale(scale, roundingMode);
double d = bd.doubleValue();
bd = null;
return d;
}
}
4.MainActivity.java
package com.jjc.demo;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
private View rootView;
private RingView ringView;
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
initView();
}
private void initView() {
ringView = (RingView) rootView.findViewById(R.id.ringview);
ringView.setMax(100);
ringView.setRate(5.43);
ringView.setTerm("六个月");
ringView.setProgress(40);
}
}
}
代码：http://pan.baidu.com/s/1eQzk5SQ
时间： 2024-08-01 09:44:07