【Android】手机蜘蛛魔术的简易app例子

手机画面内容结合魔术手法在魔术表演中可以达到一种很强的视觉场景冲击比如手机里的蜘蛛爬出来的魔术这里做一个简易的app首先找到蜘蛛的png图片多做几张可以实现更好的爬动效果这里用一张来试验把图片中的白色背景转换为透明颜色from PIL import Image # 打开图片 img Image.open(spider0.png) img img.convert(RGBA) datas img.getdata() newData [] for item in datas: # 如果像素的颜色接近白色则将其改为完全透明 if item[0] 240 and item[1] 240 and item[2] 240: newData.append((255, 255, 255, 0)) else: newData.append(item) img.putdata(newData) img.save(spider.png, PNG)app例子package com.example.magic; import androidx.appcompat.app.AppCompatActivity; import android.animation.AnimatorSet; import android.animation.ObjectAnimator; import android.os.Bundle; // app/src/main/java/com/example/spiderphoto/MainActivity.java import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.os.Bundle; import android.provider.MediaStore; import android.view.View; import android.view.animation.Animation; import android.view.animation.TranslateAnimation; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; public class MainActivity extends AppCompatActivity { private static final int REQUEST_CAMERA_PERMISSION 100; private static final int REQUEST_IMAGE_CAPTURE 101; private ImageView imageView; private View spiderView; private Button btnTakePhoto; Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); imageView findViewById(R.id.imageView); spiderView findViewById(R.id.spiderView); btnTakePhoto findViewById(R.id.btnTakePhoto); btnTakePhoto.setOnClickListener(new View.OnClickListener() { Override public void onClick(View v) { if (checkCameraPermission()) { dispatchTakePictureIntent(); } else { requestCameraPermission(); } } }); } private boolean checkCameraPermission() { return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) PackageManager.PERMISSION_GRANTED; } private void requestCameraPermission() { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION); } private void dispatchTakePictureIntent() { Intent takePictureIntent new Intent(MediaStore.ACTION_IMAGE_CAPTURE); if (takePictureIntent.resolveActivity(getPackageManager()) ! null) { startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE); } } Override public void onRequestPermissionsResult(int requestCode, NonNull String[] permissions, NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode REQUEST_CAMERA_PERMISSION) { if (grantResults.length 0 grantResults[0] PackageManager.PERMISSION_GRANTED) { dispatchTakePictureIntent(); } else { Toast.makeText(this, 需要相机权限才能拍照, Toast.LENGTH_SHORT).show(); } } } Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode REQUEST_IMAGE_CAPTURE resultCode RESULT_OK) { Bundle extras data.getExtras(); Bitmap imageBitmap (Bitmap) extras.get(data); // 显示照片 imageView.setImageBitmap(imageBitmap); imageView.setVisibility(View.VISIBLE); btnTakePhoto.setVisibility(View.GONE); // 启动蜘蛛动画 startSpiderCrawl(); } } private void startSpiderCrawl00() { ImageView spider findViewById(R.id.spiderView); spider.setVisibility(View.VISIBLE); // 获取屏幕高度用于计算移动距离 int screenHeight getResources().getDisplayMetrics().heightPixels; // 1. 主动画垂直向上移动从底部到顶部外 ObjectAnimator moveUp ObjectAnimator.ofFloat( spider, translationY, screenHeight - spider.getHeight(), // 起点底部减去自身高度 -spider.getHeight() * 1.2f // 终点顶部上方完全消失 ); moveUp.setDuration(8000); // 2. 辅助动画左右轻微晃动模拟爬行时的身体摆动 ObjectAnimator sway ObjectAnimator.ofFloat(spider, translationX, 0f, -20f, 0f, 20f, 0f); sway.setDuration(8000); sway.setRepeatCount(ObjectAnimator.INFINITE); // 循环晃动 // 3. 轻微缩放模拟腿部蹬地的弹跳感 ObjectAnimator bounce ObjectAnimator.ofFloat(spider, scaleY, 1.0f, 1.1f, 1.0f, 0.95f, 1.0f); bounce.setDuration(800); bounce.setRepeatCount(ObjectAnimator.INFINITE); bounce.setRepeatMode(ObjectAnimator.REVERSE); // 同时播放三个动画 AnimatorSet animatorSet new AnimatorSet(); animatorSet.playTogether(moveUp, sway, bounce); animatorSet.start(); // 动画结束后清理 moveUp.addListener(new android.animation.AnimatorListenerAdapter() { Override public void onAnimationEnd(android.animation.Animator animation) { spider.setVisibility(View.INVISIBLE); sway.cancel(); bounce.cancel(); btnTakePhoto.setVisibility(View.VISIBLE); } }); } private void startSpiderCrawl() { spiderView.setVisibility(View.VISIBLE); // 创建从底部到顶部的平移动画 TranslateAnimation animation new TranslateAnimation( Animation.RELATIVE_TO_PARENT, 0f, Animation.RELATIVE_TO_PARENT, 0f, Animation.RELATIVE_TO_PARENT, 0.5f, // 起点底部 Animation.RELATIVE_TO_PARENT, -1.2f // 终点顶部上方完全消失 ); animation.setDuration(8000); // 8秒 animation.setFillAfter(true); animation.setAnimationListener(new Animation.AnimationListener() { Override public void onAnimationStart(Animation animation) {} Override public void onAnimationEnd(Animation animation) { spiderView.setVisibility(View.INVISIBLE); btnTakePhoto.setVisibility(View.VISIBLE); // 恢复按钮 } Override public void onAnimationRepeat(Animation animation) {} }); spiderView.startAnimation(animation); } }