Android开发实现保存图片到手机相册功能

String[] PERMISSIONS = {    "android.permission.READ_EXTERNAL_STORAGE",    "android.permission.WRITE_EXTERNAL_STORAGE" };//检测是否有写的权限int permission = ContextCompat.checkSelfPermission(this,    "android.permission.WRITE_EXTERNAL_STORAGE");if (permission != PackageManager.PERMISSION_GRANTED) {  // 没有写的权限，去申请写的权限，会弹出对话框  ActivityCompat.requestPermissions(this, PERMISSIONS,1);}保存文件的方法：public void SaveBitmapFromView(View view) {  int w = view.getWidth();  int h = view.getHeight();  Bitmap bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);  Canvas c = new Canvas(bmp);  view.layout(0, 0, w, h);  view.draw(c); // 缩小图片 Matrix matrix = new Matrix(); matrix.postScale(0.5f,0.5f); //长和宽放大缩小的比例 bmp = Bitmap.createBitmap(bmp,0,0,        bmp.getWidth(),bmp.getHeight(),matrix,true); DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");   saveBitmap(bmp,format.format(new Date())+".JPEG");}/* * 保存文件，文件名为当前日期 */Public void saveBitmap(Bitmap bitmap, String bitName){    String fileName ;    File file ;    if(Build.BRAND .equals("Xiaomi") ){ // 小米手机       fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/Camera/"+bitName ;    }else{ // Meizu 、Oppo      fileName = Environment.getExternalStorageDirectory().getPath()+"/DCIM/"+bitName ;    }    file = new File(fileName);    if(file.exists()){      file.delete();    }    FileOutputStream out;    try{      out = new FileOutputStream(file); // 格式为 JPEG，照相机拍出的图片为JPEG格式的，PNG格式的不能显示在相册中      if(bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out))      {        out.flush();        out.close();// 插入图库           MediaStore.Images.Media.insertImage(this.getContentResolver(), file.getAbsolutePath(), bitName, null);      }    }    catch (FileNotFoundException e)    {      e.printStackTrace();    }    catch (IOException e)    {      e.printStackTrace();    } // 发送广播，通知刷新图库的显示    this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + fileName)));}