如何从对话框片段中打开新活动

Question

My program opens a DialogFragment class while running in MainActivity.java

I want to be able to click on the "neutral button" of that dialog and open a new activity, SensorDataDisplay.java

I am having trouble finding the right way to reference the Context in my button's onClick.

package com.august.customtisensortagclient;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;

import java.util.ArrayList;

public class GetInfoDialog extends DialogFragment {


    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {





        final String thisWhichGetInfoDialog = ((MainActivity)getActivity()).getWhichGetInfoDialog();
        final ArrayList<String> thisScannedDevicesArrayList =
                ((MainActivity)getActivity()).getScannedDevicesArrayList();
        final int thisIsInLeftConnectedDeviceDisplay = ((MainActivity)getActivity()).getIsInLeftConnectedDeviceDisplay();
        final int thisIsInRightConnectedDeviceDisplay = ((MainActivity)getActivity()).getIsInRightConnectedDeviceDisplay();
        int thisIsInThisConnectedDeviceDisplay = 0;

        if (thisWhichGetInfoDialog == "Left") {
            thisIsInThisConnectedDeviceDisplay = thisIsInLeftConnectedDeviceDisplay;
        } else if (thisWhichGetInfoDialog == "Right")
            thisIsInThisConnectedDeviceDisplay = thisIsInRightConnectedDeviceDisplay;

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(thisWhichGetInfoDialog + " Sensor Info");
        builder.setMessage("MAC Address: " + thisScannedDevicesArrayList.get(thisIsInThisConnectedDeviceDisplay));
        builder.setNeutralButton("View Data", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Intent myIntent = new Intent(?????, SensorDataDisplay.class);
                myIntent.putExtra("key", "TEST VALUE"); //Optional parameters
                ?????.startActivity(myIntent);
            }
        });
        builder.setNegativeButton("Done", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // User cancelled the dialog
            }
        });
        return builder.create();
    }
}

Answer 1

DialogFragment has getActivity() and getContext() methods (which it inherits from Fragment ), both will work in your case. If you're having trouble accessing these methods from the anonymous class (which shouldn't be the case), you can use the GetInfoDialog.this.getActivity() syntax.

Answer 2

getActivity() returns the Activity the fragment is attached to

builder.setNeutralButton("View Data", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Intent myIntent = new Intent(getActivity(), SensorDataDisplay.class);
                    myIntent.putExtra("key", "TEST VALUE"); //Optional parameters
                    getActivity().startActivity(myIntent);
                }
            });