Question

我想要做的是将图像保存到手机的内部存储器中（不是SD卡）。

我该怎么做？

我已经将图像直接从相机到我的应用程序中的图像视图，这一切都正常。

现在我想要的是将此图像从图像视图保存到我的Android设备的内部存储器中，并在需要时访问它。

任何人都可以指导我如何做到这一点吗？

我对android有点新意，所以，如果我能有详细的程序，我将不胜感激。

Answer 1

使用以下代码将图像保存到内部目录。

private String saveToInternalStorage(Bitmap bitmapImage){
        ContextWrapper cw = new ContextWrapper(getApplicationContext());
         // path to /data/data/yourapp/app_data/imageDir
        File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
        // Create imageDir
        File mypath=new File(directory,"profile.jpg");

        FileOutputStream fos = null;
        try {           
            fos = new FileOutputStream(mypath);
       // Use the compress method on the BitMap object to write image to the OutputStream
            bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fos);
        } catch (Exception e) {
              e.printStackTrace();
        } finally {
            try {
              fos.close();
            } catch (IOException e) {
              e.printStackTrace();
            }
        } 
        return directory.getAbsolutePath();
    }

说明：

1.将使用给定名称创建目录。 Javadocs用于告诉它将在何处创建目录。

2.您必须提供要保存的图像名称。

从内存中读取文件。使用以下代码

private void loadImageFromStorage(String path)
{

    try {
        File f=new File(path, "profile.jpg");
        Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
            ImageView img=(ImageView)findViewById(R.id.imgPicker);
        img.setImageBitmap(b);
    } 
    catch (FileNotFoundException e) 
    {
        e.printStackTrace();
    }

}

Answer 2

/**
 * Created by Ilya Gazman on 3/6/2016.
 */
public class ImageSaver {

    private String directoryName = "images";
    private String fileName = "image.png";
    private Context context;
    private boolean external;

    public ImageSaver(Context context) {
        this.context = context;
    }

    public ImageSaver setFileName(String fileName) {
        this.fileName = fileName;
        return this;
    }

    public ImageSaver setExternal(boolean external) {
        this.external = external;
        return this;
    }

    public ImageSaver setDirectoryName(String directoryName) {
        this.directoryName = directoryName;
        return this;
    }

    public void save(Bitmap bitmapImage) {
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(createFile());
            bitmapImage.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (fileOutputStream != null) {
                    fileOutputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @NonNull
    private File createFile() {
        File directory;
        if(external){
            directory = getAlbumStorageDir(directoryName);
        }
        else {
            directory = context.getDir(directoryName, Context.MODE_PRIVATE);
        }
        if(!directory.exists() && !directory.mkdirs()){
            Log.e("ImageSaver","Error creating directory " + directory);
        }

        return new File(directory, fileName);
    }

    private File getAlbumStorageDir(String albumName) {
        return new File(Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_PICTURES), albumName);
    }

    public static boolean isExternalStorageWritable() {
        String state = Environment.getExternalStorageState();
        return Environment.MEDIA_MOUNTED.equals(state);
    }

    public static boolean isExternalStorageReadable() {
        String state = Environment.getExternalStorageState();
        return Environment.MEDIA_MOUNTED.equals(state) ||
                Environment.MEDIA_MOUNTED_READ_ONLY.equals(state);
    }

    public Bitmap load() {
        FileInputStream inputStream = null;
        try {
            inputStream = new FileInputStream(createFile());
            return BitmapFactory.decodeStream(inputStream);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

用法

保存：

new ImageSaver(context).
        setFileName("myImage.png").
        setDirectoryName("images").
        save(bitmap);

加载：

Bitmap bitmap = new ImageSaver(context).
        setFileName("myImage.png").
        setDirectoryName("images").
        load();

修改

添加ImageSaver.setExternal(boolean)以支持基于googles example保存到外部存储空间。

Answer 3

今天遇到了这个问题，我就是这样做的。只需使用所需参数调用此函数

public void saveImage(Context context, Bitmap bitmap, String name, String extension){
    name = name + "." + extension;
    FileOutputStream fileOutputStream;
    try {
        fileOutputStream = context.openFileOutput(name, Context.MODE_PRIVATE);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        fileOutputStream.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

同样，为了阅读相同内容，请使用此

public Bitmap loadImageBitmap(Context context,String name,String extension){
    name = name + "." + extension
    FileInputStream fileInputStream
    Bitmap bitmap = null;
    try{
        fileInputStream = context.openFileInput(name);
        bitmap = BitmapFactory.decodeStream(fileInputStream);
        fileInputStream.close();
    } catch(Exception e) {
        e.printStackTrace();
    }
     return bitmap;
}

Answer 4

对于Kotlin用户，我创建了一个ImageStorageManager类，该类将轻松处理图像的保存，获取和删除操作：

class ImageStorageManager {
    companion object {
        fun saveToInternalStorage(context: Context, bitmapImage: Bitmap, imageFileName: String): String {
            context.openFileOutput(imageFileName, Context.MODE_PRIVATE).use { fos ->
                bitmapImage.compress(Bitmap.CompressFormat.PNG, 25, fos)
            }
            return context.filesDir.absolutePath
        }

        fun getImageFromInternalStorage(context: Context, imageFileName: String): Bitmap {
            val directory = context.filesDir
            val file = File(directory, imageFileName)
            return BitmapFactory.decodeStream(FileInputStream(file))
        }

        fun deleteImageFromInternalStorage(context: Context, imageFileName: String): Boolean {
            val dir = context.filesDir
            val file = File(dir, imageFileName)
            return file.delete()
        }
    }
}

了解更多here

Answer 5

    public static String saveImage(String folderName, String imageName, RelativeLayout layoutCollage) {
        String selectedOutputPath = "";
        if (isSDCARDMounted()) {
            File mediaStorageDir = new File(
                    Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), folderName);
            // Create a storage directory if it does not exist
            if (!mediaStorageDir.exists()) {
                if (!mediaStorageDir.mkdirs()) {
                    Log.d("PhotoEditorSDK", "Failed to create directory");
                }
            }
            // Create a media file name
            selectedOutputPath = mediaStorageDir.getPath() + File.separator + imageName;
            Log.d("PhotoEditorSDK", "selected camera path " + selectedOutputPath);
            File file = new File(selectedOutputPath);
            try {
                FileOutputStream out = new FileOutputStream(file);
                if (layoutCollage != null) {
                    layoutCollage.setDrawingCacheEnabled(true);
                    layoutCollage.getDrawingCache().compress(Bitmap.CompressFormat.JPEG, 80, out);
                }
                out.flush();
                out.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return selectedOutputPath;
    }



private static boolean isSDCARDMounted() {
        String status = Environment.getExternalStorageState();
        return status.equals(Environment.MEDIA_MOUNTED);
    }

Answer 6

//多种图像检索

 File folPath = new File(getIntent().getStringExtra("folder_path"));
 File[] imagep = folPath.listFiles();

 for (int i = 0; i < imagep.length ; i++) {
     imageModelList.add(new ImageModel(imagep[i].getAbsolutePath(), Uri.parse(imagep[i].getAbsolutePath())));
 }
 imagesAdapter.notifyDataSetChanged();

Answer 7

如果您要遵循Android 10惯例在存储中进行写入，请选中here 并且如果您只希望图像特定于应用，则here 例如，如果您要存储仅由您的应用使用的图像：

viewModelScope.launch(Dispatchers.IO) {
            getApplication<Application>().openFileOutput(filename, Context.MODE_PRIVATE).use {
                bitmap.compress(Bitmap.CompressFormat.PNG, 50, it)
            }
        }

getApplication是一种为您提供ViewModel上下文的方法，它是AndroidViewModel的一部分以后，如果您想阅读它：

viewModelScope.launch(Dispatchers.IO) {
            val savedBitmap = BitmapFactory.decodeStream(
                getApplication<App>().openFileInput(filename).readBytes().inputStream()
            )
        }

Answer 8

确保使用 WEBP 作为您的媒体格式，以在相同质量的情况下节省更多空间：

fun saveImage(context: Context, bitmap: Bitmap, name: String): String {
        context.openFileOutput(name, Context.MODE_PRIVATE).use { fos ->
            bitmap.compress(Bitmap.CompressFormat.WEBP, 25, fos)
        }
    return context.filesDir.absolutePath
 }

在Android中保存和读取内部存储器中的位图/图像

8 个答案:

用法