Android: launch a custom Preference from a PreferenceActivity

Question

I would like to be able launch a 2nd Preference screen from my PreferenceActivity. And in the 2nd Preference screen I\'d like to use a predefined layout from xml. So, I ha

Answer 1

You might want something similar to what I did to upload a photo from the gallery or camera.

package com.atClass.lmt;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.provider.MediaStore;
import android.util.Log;


public class Prefs extends PreferenceActivity{
    //public static final int FLAG_ACTIVITY_CLEAR_TOP = 1;
    private static final int MEDIA_IMAGE_REQUEST_CODE = 1;
    private static final int CAMERA_IMAGE_REQUEST_CODE = 2;
    public static Uri cImageUri;

    public static Context cContext;
    public static Activity cActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);

        this.cContext = (Context)this;
        this.cActivity = (Activity)this;

        Preference customPref = (Preference) findPreference("user_display_picture");
        customPref.setOnPreferenceClickListener(
                new OnPreferenceClickListener() {
                    public boolean onPreferenceClick(Preference preference) {
                        return imageUploadDialog();
                    }
                });
    }

    protected void onStop(){
        super.onStop();
        MapTools.createMapView(false);
        Lmt.serviceBinder.serviceThread("loginDevice");
    }

    public boolean imageUploadDialog(){
        final CharSequence[] items = {"Take picture now","Upload from gallery"};
        AlertDialog.Builder lAlertDialog = new AlertDialog.Builder(cContext);
        lAlertDialog.setTitle("Upload action");
        lAlertDialog.setCancelable(true);
        lAlertDialog.setItems(items,
                new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialogInterface, int i){
                //Toast.makeText(getApplicationContext(), "Selected item: " +i,  Toast.LENGTH_SHORT).show();
                if (i == 0){
                    attachCameraImage();
                }
                if (i == 1){
                    attachGalleryImage();
                }
            }
        });
        lAlertDialog.setIcon(R.drawable.click_to_url);
        lAlertDialog.show();
        return true;
    }

    public void attachGalleryImage(){
        Intent getImageFromGalleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
        startActivityForResult(getImageFromGalleryIntent, MEDIA_IMAGE_REQUEST_CODE);
    }

    public void attachCameraImage(){
        String fileName = "testphoto.jpg";
        ContentValues values = new ContentValues();
        values.put(MediaStore.Images.Media.TITLE, fileName);
        values.put(MediaStore.Images.Media.DESCRIPTION,"Image capture by camera");
        values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
        cImageUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, cImageUri);
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
        startActivityForResult(intent, CAMERA_IMAGE_REQUEST_CODE);
    }

    protected final void onActivityResult(final int requestCode, final int resultCode, final Intent i) {
        Log.d(Global.TAG,"--> Received callback with:" + resultCode);
        super.onActivityResult(requestCode, resultCode, i);
        if(resultCode == RESULT_OK) {
            Log.d(Global.TAG,"--> Result OK with:" + requestCode);
            switch(requestCode) {
            case MEDIA_IMAGE_REQUEST_CODE:
                Log.d(Global.TAG,"--> MEDIA_IMAGE_REQUEST_CODE");
                Gui.GuiProgressDialog.showLoadingSpinner(cActivity);
                cImageUri = i.getData();
                if (cImageUri == null){Log.d(Global.TAG,"--> ImageURI is null!");}
                Lmt.serviceBinder.serviceThread("uploadMemberPicture");
                break;
            case CAMERA_IMAGE_REQUEST_CODE:
                Log.d(Global.TAG,"--> CAMERA_IMAGE_REQUEST_CODE");
                //cImageUri = i.getData();
                if (cImageUri == null){Log.d(Global.TAG,"--> ImageURI is null!");}
                Lmt.serviceBinder.serviceThread("uploadMemberPicture");
                break;
            }
        }
    }
}