Today I had the same task, and after spending a couple of hours, I achieved this. I am posting all the code so that someone else can easily understand this. This is my activity:
package com.aqua.bluetoothfiletransfer.indragni; import java.io.File; import java.util.List; import android.Manifest; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.content.ContentUris; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.content.pm.ResolveInfo; import android.database.Cursor; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.DocumentsContract; import android.provider.MediaStore; import android.support.v4.content.ContextCompat; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import com.aqua.bluetoothfiletransfer.R; public class MainActivity extends AppCompatActivity { private static final int DISCOVER_DURATION = 300; private static final int REQUEST_BLU = 1; String path; private static final String[] INITIAL_PERMS = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.READ_CONTACTS, Manifest.permission.WRITE_CONTACTS, Manifest.permission.CAMERA, Manifest.permission.ACCESS_FINE_LOCATION}; private static final int INITIAL_REQUEST = 1337; private static final int REQUEST_WRITE_STORAGE = INITIAL_REQUEST + 4; TextView textView_FileName; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_mainn); textView_FileName = (TextView) findViewById(R.id.textView_FileName); if (!canAccessLocation() || !canAccessCamera() || !canAccessWriteStorage() || !canAccessReadStorage() || !canAccessReadContacts() || !canAccessWriteContacts()) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { requestPermissions(INITIAL_PERMS, INITIAL_REQUEST); } } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case REQUEST_WRITE_STORAGE: if (canAccessWriteStorage()) { //reload my activity with permission granted or use the features what required the permission System.out.println("permission grantedddd"); } else { Toast.makeText(this, "The app was not allowed to write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show(); } break; } } public void sendViaBluetooth(View v) { if (path == null) { Toast.makeText(this, "Please select file first", Toast.LENGTH_SHORT).show(); return; } BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter(); if (btAdapter == null) { Toast.makeText(this, "Bluetooth is not supported on this device", Toast.LENGTH_LONG).show(); } else { enableBluetooth(); } } public void getFile(View v) { Intent mediaIntent = new Intent(Intent.ACTION_GET_CONTENT); mediaIntent.setType("*/*"); //set mime type as per requirement startActivityForResult(mediaIntent, 1001); } public void enableBluetooth() { Intent discoveryIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoveryIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, DISCOVER_DURATION); startActivityForResult(discoveryIntent, REQUEST_BLU); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (resultCode == DISCOVER_DURATION && requestCode == REQUEST_BLU) { Intent intent = new Intent(); intent.setAction(Intent.ACTION_SEND); intent.setType("*/*"); File f = new File(path); intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(f)); PackageManager pm = getPackageManager(); List<ResolveInfo> appsList = pm.queryIntentActivities(intent, 0); if (appsList.size() > 0) { String packageName = null; String className = null; boolean found = false; for (ResolveInfo info : appsList) { packageName = info.activityInfo.packageName; if (packageName.equals("com.android.bluetooth")) { className = info.activityInfo.name; found = true; break; } } if (!found) { Toast.makeText(this, "Bluetooth havn't been found", Toast.LENGTH_LONG).show(); } else { intent.setClassName(packageName, className); startActivity(intent); } } } else if (requestCode == 1001 && resultCode == Activity.RESULT_OK) { Uri uriPath = data.getData(); Log.d("", "Video URI= " + uriPath); path = getPath(this, uriPath);// "/mnt/sdcard/FileName.mp3" System.out.println("pathhhh " + path); textView_FileName.setText(path); } else { Toast.makeText(this, "Bluetooth is cancelled", Toast.LENGTH_LONG) .show(); } } private boolean canAccessWriteStorage() { return (hasPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)); } private boolean canAccessReadStorage() { return (hasPermission(Manifest.permission.READ_EXTERNAL_STORAGE)); } private boolean canAccessReadContacts() { return (hasPermission(Manifest.permission.READ_CONTACTS)); } private boolean canAccessWriteContacts() { return (hasPermission(Manifest.permission.WRITE_CONTACTS)); } private boolean canAccessCamera() { return (hasPermission(Manifest.permission.CAMERA)); } private boolean canAccessLocation() { return (hasPermission(Manifest.permission.ACCESS_FINE_LOCATION)); } private boolean hasPermission(String perm) { return (PackageManager.PERMISSION_GRANTED == ContextCompat.checkSelfPermission(this, perm)); } public static String getPath(final Context context, final Uri uri) { final boolean isKitKatOrAbove = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT; // DocumentProvider if (isKitKatOrAbove && 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; } /** * Get the value of the data column for this Uri. This is useful for * MediaStore Uris, and other file-based ContentProviders. * * @param context The context. * @param uri The Uri to query. * @param selection (Optional) Filter used in the query. * @param selectionArgs (Optional) Selection arguments used in the query. * @return The value of the _data column, which is typically a file path. */ 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; } /** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } }
This is my layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical"> <TextView android:id="@+id/textView_FileName" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="50dp" android:text="Please select file" android:textSize="18sp" /> <Button android:id="@+id/button_GetFile" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="getFile" android:text="Get file from device" /> <Button android:id="@+id/button_SendFile" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="sendViaBluetooth" android:text="Send via Bluetooth" /> </LinearLayout>
Last step: please declare all permissions in the manifest:
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.INTERNET" />
What is it.