我尝试使用Android Studio在我的SD卡中保存位图图像

Question

Please help me to solve this problem in my code ,I would like to save the bitmap image (newimage) into SD card in my phone (Galaxy j7), but I get the error (no such file or directory)

File filepath;
    filepath = Environment.getExternalStorageDirectory();

   File  dir = new File(filepath.getAbsolutePath()+"/save image");
    dir.mkdirs();
    File  file = new File(dir,"myimage.png");
    Toast.makeText(MainActivity.this,"image saved to SD",Toast.LENGTH_LONG).show();
   try{

        OutputStream stream ;

        stream = new FileOutputStream(file);

        newimage.compress(Bitmap.CompressFormat.PNG,100,stream);

        stream.flush();

        stream.close();

    }catch (IOException e) 
    {
        e.printStackTrace();
    }

    // Parse the saved image path to uri
    Uri savedImageURI = Uri.parse(filepath.getAbsolutePath());

    // Display the saved image to ImageView
  //  imagev.setImageURI(savedImageURI);

    // Display saved image uri to TextView
    tv_saved.setText("Image saved in external storage.\n" + savedImageURI);

the error message is :

W/System.err: java.io.FileNotFoundException: /storage/emulated/0/save image/myimage.png (No such file or directory)

I added the permission of write in manifest.xml as follow:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
    android:maxSdkVersion="21" />
<uses-sdk
            android:minSdkVersion="9"
    android:targetSdkVersion="21"/>

Answer 1

I think there is no problem with your codes, the problem is the version of Android that you are compiling your project on. On higher versions of the Android you should implement runtime permission for storage permission.

Refer to the answer here which is going to solve your problem.

Edit: There is another problem with your implementation that I recognized after posting my answer. Before trying to save your image on the directory named save image you should create this folder by implementing

String folder_main = "save image"; File f = new File(Environment.getExternalStorageDirectory(), folder_main); if(!f.exists()) {f.mkdirs();}