安卓动画简单4个三角形

看效果:

直接看代码

package com.example.study_05_view;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Region;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;

public class AttrsView extends View {

    Paint paint;
    Paint paint2;
    Paint paint3;
    Paint paint4;


    int myWid;
    int myHie;

    Path path;
    Path path2;
    Path path3;
    Path path4;
    Context context;

    int height;
    int width;
    public AttrsView(Context context,AttributeSet attrs) {
        super(context, attrs);
        this.context=context;
        //AttributeSet 对应Set集合
        //获取自定义属性集合
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.AttrsView);
        myHie= typedArray.getInteger(R.styleable.AttrsView_hei,0);
        myWid = typedArray.getInteger(R.styleable.AttrsView_wid,0);


        paint=new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(Color.RED);
        paint.setStrokeWidth(2);
        paint.setAntiAlias(true);


        paint2=new Paint();
        paint2.setStyle(Paint.Style.STROKE);
        paint2.setColor(Color.YELLOW);
        paint2.setStrokeWidth(2);
        paint2.setAntiAlias(true);

        paint3=new Paint();
        paint3.setStyle(Paint.Style.STROKE);
        paint3.setColor(Color.GREEN);
        paint3.setStrokeWidth(2);
        paint3.setAntiAlias(true);


        paint4=new Paint();
        paint4.setStyle(Paint.Style.STROKE);
        paint4.setColor(Color.BLUE);
        paint4.setStrokeWidth(2);
        paint4.setAntiAlias(true);

        //获取窗口
        WindowManager  windowManager= (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        //
        DisplayMetrics displayMetrics=new DisplayMetrics();

        windowManager.getDefaultDisplay().getMetrics(displayMetrics);

        height=displayMetrics.heightPixels;
        width= displayMetrics.widthPixels;






    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);


        path=new Path();
        path.moveTo(0,0);
        path.lineTo(width/2,height/2);
        path.lineTo(width,0);

        path2=new Path();
        path2.moveTo(width,0);
        path2.lineTo(width/2,height/2);
        path2.lineTo(width,height);

        path3=new Path();
        path3.moveTo(width,height);
        path3.lineTo(0,height);
        path3.lineTo(width/2,height/2);

        path4=new Path();
        path4.moveTo(0,height);
        path4.lineTo(0,0);
        path4.lineTo(width/2,height/2);

        canvas.drawPath(path,paint);
        canvas.drawPath(path2,paint2);
        canvas.drawPath(path3,paint3);
        canvas.drawPath(path4,paint4);

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        int x =(int) event.getX();
        int y =(int) event.getY();
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                RectF rectF = new RectF();
                //分割矩形
                path.computeBounds(rectF,true);
                //一个区域
                Region region = new Region();

                 region.setPath(path, new Region((int)rectF.left, (int)rectF.top, (int)rectF.right,(int) rectF.bottom));

                boolean contains = region.contains(x, y);
                if(contains){
                    paint.setStyle(Paint.Style.FILL);
                }else{
                    paint.setStyle(Paint.Style.STROKE);
                }


                RectF rectF2 = new RectF();
                //分割矩形
                path2.computeBounds(rectF2,true);
                //一个区域
                Region region2 = new Region();

                region2.setPath(path2, new Region((int)rectF2.left, (int)rectF2.top, (int)rectF2.right,(int) rectF2.bottom));

                boolean contains2 = region2.contains(x, y);
                if(contains2){
                    paint2.setStyle(Paint.Style.FILL);
                }else{
                    paint2.setStyle(Paint.Style.STROKE);
                }

                RectF rectF3 = new RectF();
                //分割矩形
                path3.computeBounds(rectF3,true);
                //一个区域
                Region region3 = new Region();

                region3.setPath(path3, new Region((int)rectF3.left, (int)rectF3.top, (int)rectF3.right,(int) rectF3.bottom));

                boolean contains3 = region3.contains(x, y);
                if(contains3){
                    paint3.setStyle(Paint.Style.FILL);
                }else{
                    paint3.setStyle(Paint.Style.STROKE);
                }


                RectF rectF4 = new RectF();
                //分割矩形
                path4.computeBounds(rectF4,true);
                //一个区域
                Region region4 = new Region();

                region4.setPath(path4, new Region((int)rectF4.left, (int)rectF4.top, (int)rectF4.right,(int) rectF4.bottom));

                boolean contains4 = region4.contains(x, y);
                if(contains4){
                    paint4.setStyle(Paint.Style.FILL);
                }else{
                    paint4.setStyle(Paint.Style.STROKE);
                }

                break;
        }
        invalidate();
        return true;
    }
}