Bluetooth-Dateiübertragung in Android

Question

Ich entwickle eine App, in der ich Daten in Datei zwischen zwei Geräten übertragen muss.

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Ich habe Tutorial regaring Bluetooth-Chat gesehen, aber kann nicht herausfinden, was für Datei benötigt Sachen Transfer.If jemand es tun bereits pls mir helfen.

Answer 1

Bitte beachten Sie folgenden Artikel, Es zeigt, wie Sie native Bluetooth-Anwendung verwenden, um Datei zu senden.

http://kpbird.blogspot.com/2011/04/android-send-image-via-bluetooth.html

Answer 2

Dateiübertragung ist die gleiche wie Sie Nachricht senden. Zuerst konvertieren Sie die Datei in den Eingabestream und übertragen diese dann auf das neue Gerät.

surly wird es funktionieren.

Answer 3

Etwas wie folgt aus:

 String addr = args[0]; 
     log("Connecting over bluetooth to " + addr); 

     bs = null; 
     try { 
      BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(addr); 
      mBluetoothAdapter.cancelDiscovery(); 

      Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class}); 
      bs = (BluetoothSocket) m.invoke(device, Integer.valueOf(1)); 
      bs.connect(); 
     } catch (Exception e) { 
      return false; 
     } 

Sie müssen die MAC-Adresse des Geräts an, die Sie verbinden wollen, und dann benutzen Sie einfach die Input und Output von bs.

Answer 4

Intent intent = new Intent(); 
       intent.setAction(Intent.ACTION_SEND); 
       intent.setType("image/*"); 


       String uri = "/mnt/sdcard/test.jpg"; 
       intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(uri))); 
       startActivity(intent); 

stellen Sie diesen Code in Ihre Taste und stellen uri Pfad drücken Sie die Taste dann Datei Ihre Datei trasfer sein ..

Answer 5

Heute hatte ich die gleiche Aufgabe &, nachdem er einige Stunden hatte ich das erreicht. Ich poste den ganzen Code, damit jemand anderes das leicht verstehen kann. Dies ist meine Aktivität:

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()); 
    } 

} 

Das ist mein 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> 

Letzter Schritt ist bitte alle Berechtigungen in manifest erklären:

<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" /> 

Das ist es.