Adnroid activity截屏 保存显示到相册 View显示图片 动画消失

今天项目有个需求，截屏Activity界面，保存到本地，然后即时发送图片的时候能找到这张图片发送

流程：截屏->保存到本地->发送广播通知更新图库

先贴效果图

截屏过程

截屏后保存的文件

截屏的图片

1、写个ScreenCaptureUtil工具，实现截屏和保存，代码如下

/*** Created by nxm on 2018/1/20.*/public class ScreenCaptureUtil {
    private static ScreenCaptureUtil instance = null;private ScreenCaptureUtil() {}public static ScreenCaptureUtil getInstance() {if (null == instance) {instance = new ScreenCaptureUtil();}return instance;}public Bitmap getScreen(Activity activity) {View dView = activity.getWindow().getDecorView();dView.setDrawingCacheEnabled(false);dView.buildDrawingCache();Bitmap bitmap = Bitmap.createBitmap(dView.getDrawingCache());if (bitmap != null) {try {// 首先保存图片String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "HIS";File appDir = new File(storePath);if (!appDir.exists()) {appDir.mkdir();}String fileName = System.currentTimeMillis() + ".jpg";File file = new File(appDir, fileName);BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);bos.flush();bos.close();Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);Uri uri = Uri.fromFile(file);intent.setData(uri);activity.sendBroadcast(intent);dView.destroyDrawingCache();return bitmap;} catch (Exception e) {return null;}} else {return null;}}
}

重点：
1）获取activity截屏生成Bitmap

   View dView = activity.getWindow().getDecorView();dView.setDrawingCacheEnabled(false);dView.buildDrawingCache();Bitmap bitmap = Bitmap.createBitmap(dView.getDrawingCache());

2）创建文件路径 保存bitmap（保存到相册根目录->File.separator）

     // 首先保存图片String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "HIS";File appDir = new File(storePath);if (!appDir.exists()) {appDir.mkdir();}String fileName = System.currentTimeMillis() + ".jpg";File file = new File(appDir, fileName);BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos);bos.flush();bos.close();

3)发送广播通知相册刷新加入这张图片

Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);Uri uri = Uri.fromFile(file);intent.setData(uri);activity.sendBroadcast(intent);

4）销毁缓存（不销毁，保存的总是第一张的内容）

  dView.destroyDrawingCache();

2、在activity中使用（项目需求是截屏后，显示一下，然后动画退出消失）

 case R.id.btn_two://截屏Bitmap screen = ScreenCaptureUtil.getInstance().getScreen(MainActivity.this);String content = "";if (null != screen) {show_screen.setVisibility(View.VISIBLE);showImage.setImageBitmap(screen);Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.scaleanimation);animation.setFillAfter(true);showImage.startAnimation(animation);content = "截屏成功";} else {content = "截屏失败";}Toast.makeText(MainActivity.this, content, Toast.LENGTH_SHORT).show();break;

重点：
1）加载动画，并且显示（先判断是否保存成功即bitmap是否等于null）

   Animation animation = AnimationUtils.loadAnimation(MainActivity.this, R.anim.scaleanimation);animation.setFillAfter(true);showImage.startAnimation(animation);

2）动画scaleanimation.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"><scale  android:duration="1000"android:fromXScale="1.0"android:fromYScale="1.0"android:interpolator="@android:anim/accelerate_interpolator"android:pivotX="5%"android:pivotY="5%"android:toXScale="0.0"android:toYScale="0.0" />
</set>

记得添加读写权限

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />