Surface View旋转一个图片以及不让程序扫描sd卡的图片

最新推荐文章于 2023-02-06 15:08:52 发布

最新推荐文章于 2023-02-06 15:08:52 发布 · 90 阅读

android 专栏收录该内容

880 篇文章

订阅专栏

本文介绍了一种使用Java实现的旋转动画方法，通过不断更新旋转角度来平滑地改变图像的旋转状态。此外，还提供了一个技巧，即在图片文件夹中创建一个名为 .nomedia 的空文件来阻止Android系统扫描特定图片。

1.private void animateRotation(int degrees, float durationOfAnimation){
long startTime = SystemClock.elapsedRealtime();
long currentTime;
float elapsedRatio = 0;
Bitmap bufferBitmap = carBitmap;

Matrix matrix = new Matrix();

while (elapsedRatio < 1){
matrix.setRotate(elapsedRatio * degrees);
carBitmap = Bitmap.createBitmap(bufferBitmap, 0, 0, width, height, matrix, true);
//draw your canvas here using whatever method you've defined
currentTime = SystemClock.elapsedRealtime();
elapsedRatio = (currentTime - startTime) / durationOfAnimation;
}

// As elapsed ratio will never exactly equal 1, you have to manually draw the last frame
matrix = new Matrix();
matrix.setRotate(degrees);
carBitmap = Bitmap.createBitmap(bufferBitmap, 0, 0, width, height, matrix, true);
// draw the canvas again here as before
// And you can now set whatever other notification or action you wanted to do at the end of your animation

}
2.不让扫描图片