Android自定义View模拟并实现3D柱状图

先看效果图

呈上代码：

自定义View类

public class MyBarView extends View {    private Paint barPaint;                             //柱状图画笔    private Paint shadowPaint;                          //阴影画笔    private int xOffset=1,yOffset=1;                    //x和y方向的偏移量    private int startX=100,startY=400,endX=200,endY=1000;    private int layerNum=25;                            //画布的层数    private int barMargin=50;                           //每个柱状体之前的间隔    private List percents=new ArrayList<>(); //每种数据的数值，用于计算比例，画出柱状体高度    private int perSum;                                 //每种数据数值的总和    public MyBarView(Context context,int... pers){        super(context);        for(int i=0;i=1;j--){       //从后往前画                canvas.drawRect(startX+xOffset*j,nowStartY-yOffset*j,endX+xOffset*j,endY-yOffset*j,barPaint);                if(j==1||j==layerNum)           //画阴影                    canvas.drawRect(startX+xOffset*j,nowStartY-yOffset*j,endX+xOffset*j,endY-yOffset*j,shadowPaint);            }            int length=endX-startX;     //矩形边长            startX+=length+barMargin;   //计算下一个柱状体的左上角x点的值            endX+=length+barMargin;     //计算下一个柱状体的右下角x点的值        }    }    private void init(){    //初始化控件        barPaint=new Paint();        barPaint.setStyle(Paint.Style.FILL);        barPaint.setColor(Color.RED);        shadowPaint=new Paint();        shadowPaint.setStyle(Paint.Style.STROKE);        shadowPaint.setStrokeWidth(1);        shadowPaint.setColor(Color.parseColor("#515151"));    }}

MainActivity中创建该View

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView(){        MyBarView myBarView=new MyBarView(this,10,20,30,50,60,80);        ((FrameLayout)(findViewById(R.id.frame))).addView(myBarView);    }}

最后是布局文件

<?xml version="1.0" encoding="utf-8"?>

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