android将图像保存到内部存储

Question

我在执行此代码时遇到问题 Saving and Reading Bitmaps/Images from Internal memory in Android

要保存和检索我想要的图像，这是我的代码:

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, + name + "profile.jpg");

            FileOutputStream fos = null;
            try {           

                fos = new FileOutputStream(mypath);

           // Use the compress method on the BitMap object to write image to the OutputStream
                myBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
                fos.close();
            } catch (Exception e) {
                e.printStackTrace();
            }

并检索(不知道是不是我做错了)

 @Override
   protected void onResume()
   {
      super.onResume();

      try {
          File f  = new File("imageDir/" + rowID, "profile.jpg");
        Bitmap b = BitmapFactory.decodeStream(new FileInputStream(f));
        image = (ImageView) findViewById(R.id.imageView2);
        image.setImageBitmap(b);

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

没有任何反应，那么我应该改变什么？？

Answer 1

要将位图保存在 sdcard 中，请使用以下代码

店铺形象

private void storeImage(Bitmap image) {
    File pictureFile = getOutputMediaFile();
    if (pictureFile == null) {
        Log.d(TAG,
                "Error creating media file, check storage permissions: ");// e.getMessage());
        return;
    } 
    try {
        FileOutputStream fos = new FileOutputStream(pictureFile);
        image.compress(Bitmap.CompressFormat.PNG, 90, fos);
        fos.close();
    } catch (FileNotFoundException e) {
        Log.d(TAG, "File not found: " + e.getMessage());
    } catch (IOException e) {
        Log.d(TAG, "Error accessing file: " + e.getMessage());
    }  
}

获取图片存储路径

/** Create a File for saving an image or video */
private  File getOutputMediaFile(){
    // To be safe, you should check that the SDCard is mounted
    // using Environment.getExternalStorageState() before doing this. 
    File mediaStorageDir = new File(Environment.getExternalStorageDirectory()
            + "/Android/data/"
            + getApplicationContext().getPackageName()
            + "/Files"); 

    // This location works best if you want the created images to be shared
    // between applications and persist after your app has been uninstalled.

    // Create the storage directory if it does not exist
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            return null;
        }
    } 
    // Create a media file name
    String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmm").format(new Date());
    File mediaFile;
        String mImageName="MI_"+ timeStamp +".jpg";
        mediaFile = new File(mediaStorageDir.getPath() + File.separator + mImageName);  
    return mediaFile;
}