Back to the previous activity on back pressed

Question

I have a function which display FileDialog and Intent to use Bluetooth. But when I press back button, it comes to previous activity, it is visible but not clickable (like screenshot) and I have to press the back button once again. I tried function onBackPressed() { finish(); }, but nothing worked properly.

MainActivity:

    ...
        if(item == shareMenu) {
            startActivity(new Intent(getBaseContext(), ShareViaBluetoothActivity.class));
        }
...

ShareViaBluetoothActivity:

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.util.List;

public class ShareViaBluetoothActivity extends Activity {

    private static final int DISCOVER_DURATION = 300;
    private static final int REQUEST_BLU = 1;

    private FileDialog fileDialog;

    public File getFile() {
        return file;
    }

    public void setFile(File file) {
        this.file = file;
    }

    private File file;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

         File mPath = new File(Environment.getExternalStorageDirectory(), "//DIR//");
        fileDialog = new FileDialog(this, mPath);
        fileDialog.addFileListener(new FileDialog.FileSelectedListener() {
            public void fileSelected(File file) {
                Log.d(getClass().getName(), "selected file " + file.toString());
                setFile(file);
                sendViaBluetooth();
            }
        });
        fileDialog.showDialog();
    }

    public void sendViaBluetooth() {

        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 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("*/*");

            intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(file.toString())));
            intent.setPackage("com.android.bluetooth");

            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 {
            Toast.makeText(this, "Bluetooth is cancelled", Toast.LENGTH_LONG)
                    .show();
        }
    }
}

Answer 1

What you described was not so complete. But I this there are some reasons may result to this, then you can check it.
1. use super.onBackPressed() or give onBackPressed() return can make different
2. please check activity launch mode work.

but you'd better give a more detailed code,then I can help you