Android - open file from phone memory using intent

Question

I am working on an app that takes the .txt file from a phone as input and prints it on the TextView,

public class MainActivity extends AppCompatActivity {
Button button;
Intent intent;private StringBuilder text = new StringBuilder();



private InputStream getResources(String s) {
    return null;
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    button = (Button) findViewById(R.id.btn);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.setType("text/plain");
            startActivityForResult(intent, 7);
            Log.v("###", "parent "  + getParent());
        }

    });
} @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    String Fpath = data.getDataString();
  //  final String fileName = ""+Fpath;
    Log.v("###", "yo " +Fpath);

    super.onActivityResult(requestCode, resultCode, data);

    switch (requestCode) {
        case 7:

            if (resultCode == RESULT_OK) {
                setContentView(R.layout.activity_main);


                Log.v("###", "hellow");
                setContentView(R.layout.activity_main);
                BufferedReader reader = null;

                try {

                    reader = new BufferedReader(

             new InputStreamReader(getAssets().open("filename.txt")));
                    //change code
                    // do reading
                    String mLine;
                    while ((mLine = reader.readLine()) != null) {
                        text.append(mLine);
                        text.append('\n');
                    }
                } catch (IOException e) {
                    String PathHolder = data.getData().getPath();
                    Toast.makeText(MainActivity.this, PathHolder, Toast.LENGTH_LONG).show();
                    e.printStackTrace();
                } finally {


                    if (reader != null) {
                        try {
                            reader.close();
                        } catch (IOException e) {
                            //log the exception
                        }
                    }

                    TextView output = (TextView) findViewById(R.id.Txt);
                    output.setText((CharSequence) text);

                }
            }
    }
}
}

everything is good but the line

new InputStreamReader(getAssets().open("filename.txt")));

Taking the file from Assets folder, Help me to get the file from My phone,

The file from Assets folder opening properly but I want it to be select from my phone

once check this site https://coderwall.com/p/0ldbgw/working-with-assets-in-android — Venki WAR, Oct 09 '18 at 04:21

Abhay Koradiya · Accepted Answer · 2018-10-11T08:42:08.233

5

You can get file path in onActivityResult which you selected from file manager.

 Uri PathHolder = data.getData();

UPDATE

Above line give you uri of file which you selected from storage. Then You can get File from that Uri easily.

Just forgot about getAssets Use Following method to read from file.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Uri PathHolder = data.getData();
    FileInputStream fileInputStream = null;
    StringBuilder text = new StringBuilder();
    try {
        InputStream inputStream = getContentResolver().openInputStream(PathHolder);
        BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));
        String mLine;
        while ((mLine = r.readLine()) != null) {
            text.append(mLine);
            text.append('\n');
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

edited Oct 11 '18 at 08:42

answered Oct 09 '18 at 04:40

Abhay Koradiya

2,068
2
15
40

problem is in the getAssets method I think that is working with the assets folder only, – Krishna Murari Oct 09 '18 at 06:05
But why you use getAssets for getting file from storage ? – Abhay Koradiya Oct 09 '18 at 06:15
`getAssets()` used for interaction with assets only. – Abhay Koradiya Oct 09 '18 at 06:16
because I don't know, what should I use – Krishna Murari Oct 09 '18 at 06:30
check my Edited Answer. – Abhay Koradiya Oct 09 '18 at 07:41
what is input stream, and can i define it null? – Krishna Murari Oct 09 '18 at 07:49
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/181530/discussion-between-abhay-koradiya-and-krishna). – Abhay Koradiya Oct 09 '18 at 07:51
how to print it on text view ? its not printing on text view – Krishna Murari Oct 09 '18 at 07:51

score 0 · Answer 2 · answered Oct 09 '18 at 04:26

You can try this approach:

 public static String getMimeType(String url) {
    String type = null;
    String extension = MimeTypeMap.getFileExtensionFromUrl(url);
    if (extension != null) {
        type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    }
    return type;
}

 public static Uri getFileUri(String filePath) {
    Uri fileUri = null;
    File file = new File(filePath);
    try {
        if (Build.VERSION.SDK_INT >= 24) {
            Method m = StrictMode.class.getMethod("disableDeathOnFileUriExposure");
            m.invoke(null);
        }
        fileUri = Uri.fromFile(file);
    } catch (Exception e) {
        e.printStackTrace();
    }
    return fileUri;
}

and for the intent:

if (path.endsWith(".txt") || path.endsWith(".TXT")) {
        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(getFileUri(path.trim()), getMimeType(path.trim()));
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);

        if (intent.resolveActivity(context.getPackageManager()) != null) {
            context.startActivity(intent);
        } else
            Toast.makeText(context, "There is no application available to handle your request!!", Toast.LENGTH_SHORT).show();

    }

is the getAssets() method is use full if i want to access the file from the phone not form Assets folder in the project ?? — Krishna Murari, Oct 09 '18 at 06:59
if you want to read a file from assets you can try this one https://stackoverflow.com/a/9544781/6587502 — Ashutosh Sagar, Oct 09 '18 at 10:08
no, i don't want to use assets any other way so I can take the file from the phone — Krishna Murari, Oct 09 '18 at 12:36
Give the required permission and read that file from its path — Ashutosh Sagar, Oct 10 '18 at 07:23
still, you don't understand I think, I want to select file according to me I can't give a specific file name — Krishna Murari, Oct 11 '18 at 04:08

SoloWolf93 · Answer 3 · 2018-10-10T12:29:48.383

There is a slight change in your onActivityResult First paste this code in your activity.

    public static String getPath(final Context context, final Uri uri) {

            final boolean isKitKat = true;

            // DocumentProvider
            if (DocumentsContract.isDocumentUri(context, uri)) {
                // ExternalStorageProvider
                if (isExternalStorageDocument(uri)) {
                    final String docId = DocumentsContract.getDocumentId(uri);
                    final String[] split = docId.split(":");
                    final String type = split[0];

                    if ("primary".equalsIgnoreCase(type)) {
                        return Environment.getExternalStorageDirectory() + "/" + split[1];
                    }

                    // TODO handle non-primary volumes
                }
                // DownloadsProvider
                else if (isDownloadsDocument(uri)) {

                    final String id = DocumentsContract.getDocumentId(uri);
                    final Uri contentUri = ContentUris.withAppendedId(
                            Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

                    return getDataColumn(context, contentUri, null, null);
                }
                // MediaProvider
                else if (isMediaDocument(uri)) {
                    final String docId = DocumentsContract.getDocumentId(uri);
                    final String[] split = docId.split(":");
                    final String type = split[0];

                    Uri contentUri = null;
                    if ("image".equals(type)) {
                        contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                    } else if ("video".equals(type)) {
                        contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                    } else if ("audio".equals(type)) {
                        contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                    }

                    final String selection = "_id=?";
                    final String[] selectionArgs = new String[]{
                            split[1]
                    };

                    return getDataColumn(context, contentUri, selection, selectionArgs);
                }
            }
            // MediaStore (and general)
            else if ("content".equalsIgnoreCase(uri.getScheme())) {
                return getDataColumn(context, uri, null, null);
            }
            // File
            else if ("file".equalsIgnoreCase(uri.getScheme())) {
                return uri.getPath();
            }

            return null;
        }
  public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }
 public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }
  public static String getDataColumn(Context context, Uri uri, String selection,
                                       String[] selectionArgs) {

        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {
                column
        };

        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                    null);
            if (cursor != null && cursor.moveToFirst()) {
                final int column_index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(column_index);
            }
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return null;
    }
public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

now change your onActivityResult to this.

  @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        if (requestCode == 1) {
            if (resultCode == RESULT_OK) {
//                String pickedImage = data.getData().getPath();
                String dataString = getPath(this, Uri.parse(data.getDataString()));
                Log.i(TAG, "onActivityResult: pathholder " + dataString);
                File file = new File(dataString);//
                FileInputStream fis = null;
                Log.i(TAG, "onActivityResult: file " + file.getName());
/**if you get the uri(path) then add this following code that i given below*/
                try {
                    fis = new FileInputStream(file.getAbsolutePath());
                    InputStreamReader isr = new InputStreamReader(fis);
                    BufferedReader bufferedReader = new BufferedReader(isr);
                    StringBuilder sb = new StringBuilder();
                    String line;
                    while ((line = bufferedReader.readLine()) != null) {
                        sb.append(line).append("\n");

                    }
                    Log.i(TAG, "onActivityResult: pathholder " + sb.toString());
                } catch (IOException e) {
                    e.printStackTrace();
                }



            }
        }
    }

i don't have any file in project i want to take the file on click — Krishna Murari, Oct 09 '18 at 08:43
okay then you have to call intent and add a permission to read and write.. I will post how to do that. — SoloWolf93, Oct 09 '18 at 08:47
now please check the code.. i have changed the onActivity result... im using this code right now. — SoloWolf93, Oct 09 '18 at 09:16
Yes, if you get the Uri path. then add the try catch code that written in onActivityresult. — SoloWolf93, Oct 10 '18 at 12:31
don't you see my code... that i have written in onActivityResult. It's the code for reading the .txt file.. — SoloWolf93, Oct 11 '18 at 07:11
android got much more intelligence, they've disabled access in android 11 — Fayaz, Feb 15 '21 at 17:08

Android - open file from phone memory using intent

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