package sketchpad.jackyoung.com.scalesketchpaddemo3.workbox; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Environment; import android.provider.MediaStore; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.text.SimpleDateFormat; import java.util.Date; /** * Created by 炒饭 on 2017/8/13 */ public class BitmapUtils { public static void saveBitmap(Bitmap bitmap, String fileName, Context context){ String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); String path=getSavePath(context)+ File.separator+fileName+"_"+timeStamp+".jpg"; try { FileOutputStream fileOutputStream=new FileOutputStream(path); bitmap.compress(Bitmap.CompressFormat.JPEG,100,fileOutputStream); } catch (FileNotFoundException e) { e.printStackTrace(); } } public static boolean isExternalStorageWritable() { String state = Environment.getExternalStorageState(); if (Environment.MEDIA_MOUNTED.equals(state)) { return true; } return false; } public static boolean isExternalStorageReadable() { String state = Environment.getExternalStorageState(); if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) { return true; } return false; } public static File getSavePath(Context context){ if(isExternalStorageWritable()){ return Environment.getExternalStorageDirectory(); } return context.getCacheDir(); } public static Bitmap getBitmapPathFromData(Intent intent, Context context){ Uri uri=intent.getData(); String[] filePathColumes={MediaStore.Images.Media.DATA}; Cursor cursor=context.getContentResolver().query(uri,filePathColumes,null,null,null); cursor.moveToFirst(); int columnIndex=cursor.getColumnIndex(filePathColumes[0]); String picturePath=cursor.getString(columnIndex); return decodeSampledBitmapFromResource(picturePath,720,720); } public static Bitmap decodeSampledBitmapFromResource(String path, int reqWidth, int reqHeight) { final BitmapFactory.Options options = new BitmapFactory.Options(); options.inJustDecodeBounds = true; BitmapFactory.decodeFile(path, options); options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); options.inJustDecodeBounds = false; return BitmapFactory.decodeFile(path, options); } public static int calculateInSampleSize( BitmapFactory.Options options, int reqWidth, int reqHeight) { final int height = options.outHeight; final int width = options.outWidth; int inSampleSize = 1; if (height > reqHeight || width > reqWidth) { final int halfHeight = height / 2; final int halfWidth = width / 2; while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) { inSampleSize *= 2; } } return inSampleSize; } }