android 在Sdcard和本地创建文件保存图片

缺乏、安全感 2022-07-14 05:47 322阅读 0赞

设置Sdcard的权限：

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

import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.os.Environment;
    import android.util.Log;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    
    
    public class SaveImgToFile {
        private Context context;
        public SaveImgToFile(Context context){
            this.context = context;
        }
        /*
         **创建文件夹
         * filepath文件夹名字
         * filename文件名字
         */
        public void SaveImgToFile(String filepath,String filename,Bitmap bitmap){
                 if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                     //创建SDcard文件夹
                        String filedir = Environment.getExternalStorageDirectory()+"/"
                                +context.getPackageName()+"/"+filepath;
                     File file = new File(filedir);
                     if (!file.exists()){
                         file.mkdirs();
                     }
                     File file_name = new File(filedir,filename);
                     SaveImg(file_name,bitmap);
                     Log.e("SDcard",filedir);
                 }else {
                     //创建本地文件夹
                     File file_name = new File(context.getDir(filepath,context.MODE_PRIVATE),filename);
                     Log.e("localSD",context.getDir(filepath,context.MODE_PRIVATE).getPath());
                     SaveImg(file_name,bitmap);
    
                 }
        }
        //获取保存的图片
        public Bitmap GetImgFromFile(String filepath,String filename){
            Bitmap bitmap = null;
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                String filedir = Environment.getExternalStorageDirectory()+"/"
                        +context.getPackageName()+"/"+filepath;
                File file_name = new File(filedir,filename);
                bitmap = ReadImg(file_name);
            }else {
                File file_name = new File(context.getDir(filepath,context.MODE_PRIVATE),filename);
                bitmap = ReadImg(file_name);
            }
            return bitmap;
        }
    
        //保存图片
        private void SaveImg(File file_name,Bitmap bitmap){
            try {
                FileOutputStream fos = new FileOutputStream(file_name);
                bitmap.compress(Bitmap.CompressFormat.PNG,100,fos);
                fos.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
    
        }
    
        private Bitmap ReadImg(File file_name ){
            Bitmap bitmap = null;
            try {
                FileInputStream fis = new FileInputStream(file_name);
                bitmap = BitmapFactory.decodeStream(fis);
                fis.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return bitmap;
        }
    
    }