Android屏幕随机位置弹出View

谁践踏了优雅 2022-06-14 08:26 540阅读 0赞

最近项目中人脸注册需要尽量多的捕捉人脸特征，就要想办法使得人脸在注册中呈现不同角度，于是想到在屏幕内随机位置弹出一个吸引注意力的View。  
本文中主要用到:  
1.view.setX();setY()方法。  
2.帧动画简单使用  
3.addView前记得removeView();

package com.interjoy.testdemo;
    
    import android.app.Activity;
    import android.content.Context;
    import android.graphics.drawable.AnimationDrawable;
    import android.graphics.drawable.Drawable;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.DisplayMetrics;
    import android.view.View;
    import android.view.Window;
    import android.view.WindowManager;
    import android.widget.FrameLayout;
    import android.widget.ImageView;
    
    import java.util.Random;
    
    public class SparkActivity extends Activity { 
        private FrameLayout frameLayout;//烟花的父控件
        private int screenWidth, screenHeight;//屏幕的宽度，高度
        private ImageView imageView;//显示烟花动画
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.activity_spark);
            initViews();
        }
    
        private void initViews() {
            //获取屏幕宽高
            WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
            DisplayMetrics outMetrics = new DisplayMetrics();
            wm.getDefaultDisplay().getMetrics(outMetrics);
            screenWidth = outMetrics.widthPixels;
            screenHeight = outMetrics.heightPixels;
            frameLayout = (FrameLayout) findViewById(R.id.fl_spark);
            imageView = new ImageView(this);
            //点击事件弹出动画
            findViewById(R.id.btn_popup).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    frameLayout.removeAllViews();//避免重复添加某控件，所以要移除
                    loadAnim2();
                }
            });
        }
    
        private void loadAnim2() {
            //动画控件的宽高
            int viewWidth = 255;
            int viewHeight = 255;
            //随机生成一个屏内的位置来显示动画
            int x = getRandomInt(screenWidth - viewWidth);
            int y = getRandomInt(screenHeight - viewHeight);
            imageView.setX(x);
            imageView.setY(y);
            //设置动画的宽和高
            FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(viewWidth, viewHeight);
            frameLayout.addView(imageView, lp);
            AnimationDrawable anim = new AnimationDrawable();
            for (int i = 1; i < 22; i++) {
       //资源文件res/drawable中有图片bomb1~bomb21
                int id = getResources().getIdentifier("bomb" + i, "drawable", getPackageName());
                Drawable drawable = getResources().getDrawable(id);
                anim.addFrame(drawable, 100);
            }
            anim.setOneShot(false);
            imageView.setImageDrawable(anim);
            anim.start();
        }
    
    
        //生成随机数 范围 [0,max)
        private int getRandomInt(int max) {
            Random random = new Random();
            return random.nextInt(max);
        }
    }

布局文件

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout 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.interjoy.testdemo.SparkActivity">
    
        <FrameLayout android:id="@+id/fl_spark" android:layout_width="match_parent" android:layout_height="match_parent" />
    
        <Button android:id="@+id/btn_popup" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="bottom|center_horizontal" android:layout_marginBottom="40dp" android:text="随机弹烟花" />
    </FrameLayout>

贴上一张效果图：  
![这里写图片描述][SouthEast]

[SouthEast]: /images/20220614/5462ea9211704c8a9b816cc68d784554.png