Java – android – toolbar does not appear in activities

Committed to wallpaper apps and working on moving to API 21 and removing ActionBar in favor of Toolbar. That being said, I’m trying to use the v7-support library. What happens is basically that the toolbar should have a gray outline where it should be, but it never appears.

WallpaperActivity.java:

package com.death2all110.blisspapers;

import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import com.koushikdutta.urlimageviewhelper.UrlImageViewCallback;
import com.koushikdutta.urlimageviewhelper.UrlImageViewHelper;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;

public class WallpaperActivity extends ActionBarActivity {

public final String TAG = "BlissPapers";
    protected static final String MANIFEST = "wallpaper_manifest.xml";
    protected static final int THUMBS_TO_SHOW = 4;

/*
     * pull the manifest from the web server specified in config.xml or pull
     * wallpaper_manifest.xml from local assets/ folder for testing
     */
    public static final boolean USE_LOCAL_MANIFEST = false;

ArrayList<WallpaperCategory> categories = null;
    ProgressDialog mLoadingDialog;

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

Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
        window.setStatusBarColor(getResources().getColor(R.color.primary_dark));

setContentView(R.layout.activity_wallpaper);

mLoadingDialog = new ProgressDialog(this);
        mLoadingDialog.setCancelable(false);
        mLoadingDialog.setIndeterminate(true);
        mLoadingDialog.setMessage("Retreiving wallpapers from server...");

mLoadingDialog.show();
        new LoadWallpaperManifest().execute();

Toolbar ab = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(ab);
        getSupportActionBar().setTitle("Bliss Papers");
        getSupportActionBar().setDisplayShowTitleEnabled(true);

UrlImageViewHelper.setErrorDrawable(getResources().getDrawable(com.death2all110.blisspapers.R.drawable.ic_error));

}

@Override
    public void onResume() {
        super.onResume();
        Wallpaper.wallpapersCreated = 0;
    }

protected void loadPreviewFragment() {
        WallpaperPreviewFragment fragment = new WallpaperPreviewFragment();
        FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction ft = fragmentManager.beginTransaction();
        ft.add(android. R.id.content, fragment);
        ft.commit();
    }

public static class WallpaperPreviewFragment extends Fragment {

static final String TAG = "PreviewFragment";
        WallpaperActivity mActivity;
        View mView;

public int currentPage = -1;
        public int highestExistingIndex = 0;
        Button back;
        Button next;
        TextView pageNum;
        ThumbnailView[] thumbs;
        protected int selectedCategory = 0;  *should* be <ALL> wallpapers

@Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            mActivity = (WallpaperActivity) getActivity();
            next();  load initial page
        }

public void setCategory(int cat) {
            selectedCategory = cat;
            currentPage = -1;
            next();
        }

@Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {

mView = inflater.inflate(com.death2all110.blisspapers.R.layout.activity_wallpaper, container, false);

back = (Button) mView.findViewById(com.death2all110.blisspapers.R.id.backButton);
            next = (Button) mView.findViewById(com.death2all110.blisspapers.R.id.nextButton);
            pageNum = (TextView) mView.findViewById(com.death2all110.blisspapers.R.id.textView1);

thumbs = new ThumbnailView[THUMBS_TO_SHOW];
            thumbs[0] = (ThumbnailView) mView.findViewById(com.death2all110.blisspapers.R.id.imageView1);
            thumbs[1] = (ThumbnailView) mView.findViewById(com.death2all110.blisspapers.R.id.imageView2);
            thumbs[2] = (ThumbnailView) mView.findViewById(com.death2all110.blisspapers.R.id.imageView3);
            thumbs[3] = (ThumbnailView) mView.findViewById(com.death2all110.blisspapers.R.id.imageView4);

next.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    next();
                }
            });

back.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    previous();
                }
            });

return mView;
        }

public ArrayList<WallpaperCategory> getCategories() {
            return mActivity.categories;
        }

protected Wallpaper getWallpaper(int realIndex) {
            return getCategories().get(selectedCategory).getWallpapers().get(realIndex);
        }

protected void setThumbs() {
            for (ThumbnailView v : thumbs)
                v.setVisibility(View.INVISIBLE);

final int numWallpapersInCategory = getCategories().get(selectedCategory)
                    .getWallpapers().size();
            boolean enableForward = true;

for (int i = 0; i < thumbs.length; i++) {
                final int realIndex = (currentPage * thumbs.length + i);
                if (realIndex >= (numWallpapersInCategory - 1)) {
                    enableForward = false;
                    break;
                }

Wallpaper w = getWallpaper(realIndex);
                thumbs[i].setOnClickListener(null);
                thumbs[i].getName().setText(w.getName());
                thumbs[i].getAuthor().setText(w.getAuthor());
                UrlImageViewHelper.setUrlDrawable(thumbs[i].getThumbnail(), w.getThumbUrl(),
                        com.death2all110.blisspapers.R.drawable.ic_placeholder, new ThumbnailCallBack(w, realIndex));
            }

back.setEnabled(currentPage != 0);
            next.setEnabled(enableForward);
        }

public void next() {
            getNextButton().setEnabled(false);
            pageNum.setText(getResources().getString(com.death2all110.blisspapers.R.string.page) + " " + (++currentPage + 1));

setThumbs();
        }

public void previous() {
            pageNum.setText(getResources().getString(com.death2all110.blisspapers.R.string.page) + " " + (--currentPage + 1));

setThumbs();
        }

protected void skipToPage(int page) {
            if (page < currentPage) {
                while (page < currentPage) {
                    previous();  should subtract page
                }
            } else if (page > currentPage) {
                while (page > currentPage) {
                    next();
                }
            }
        }

public void jumpTo() {
             View view = getLayoutInflater().inflate(R.layout.dialog_jumpto,
             null);
             final EditText e = (EditText) view.findViewById(R.id.pageNumber);
             AlertDialog.Builder j = new AlertDialog.Builder(this);
             j.setTitle(R.string.jump2);
             j.setView(view);
             j.setPositiveButton(android. R.string.ok, new
             DialogInterface.OnClickListener() {
            //
             public void onClick(DialogInterface dialog, int which) {
             skipToPage(Integer.parseInt(e.getText().toString()));
            // }
            // });
             j.setNegativeButton(android.R.string.no, new
             DialogInterface.OnClickListener() {
            //
             public void onClick(DialogInterface dialog, int which) {
             dialog.cancel();
            // }
            // });
             j.create().show();
        }

protected View getThumbView(int i) {
            if (thumbs != null && thumbs.length > 0)
                return thumbs[i];
            else
                return null;
        }

protected Button getNextButton() {
            return next;
        }

protected Button getPreviousButton() {
            return back;
        }

@Override
        public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
            super.onCreateOptionsMenu(menu, inflater);
        }

public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()) {
                case com.death2all110.blisspapers.R.id.jump:
                    jumpTo();
                    return true;
                default:
                    return super.onOptionsItemSelected(item);
            }
        }

class ThumbnailCallBack implements UrlImageViewCallback {

Wallpaper wall;
            int index;

public ThumbnailCallBack(Wallpaper wall, int index) {
                this.wall = wall;
                this.index = index;
            }

@Override
            public void onLoaded(ImageView imageView, Drawable loadedDrawable, String url,
                    boolean loadedFromCache, boolean error) {

final int relativeIndex = index % 4;
                if (!error) {
                    getThumbView(relativeIndex).setOnClickListener(
                            new ThumbnailClickListener(wall));
                }
                getThumbView(relativeIndex).setVisibility(View.VISIBLE);

if (relativeIndex == 3)
                    getNextButton().setEnabled(true);
            }
        }

class ThumbnailClickListener implements View.OnClickListener {
            Wallpaper wall;

public ThumbnailClickListener(Wallpaper wallpaper) {
                this.wall = wallpaper;
            }

@Override
            public void onClick(View v) {
                Intent preview = new Intent(mActivity, Preview.class);
                preview.putExtra("wp", wall.getUrl());
                startActivity(preview);
            }
        }
    }

public static String getDlDir(Context c) {
        String configFolder = getResourceString(c, com.death2all110.blisspapers.R.string.config_wallpaper_download_loc);
        if (configFolder != null && !configFolder.isEmpty()) {
            return new File(Environment.getExternalStorageDirectory(), configFolder)
                    .getAbsolutePath() + "/";
        } else {
            return Environment.getExternalStorageDirectory().getAbsolutePath();
        }
    }

public static String getSvDir(Context c) {
        String configFolder = getResourceString(c, com.death2all110.blisspapers.R.string.config_wallpaper_sdcard_dl_location);
        if (configFolder != null && !configFolder.isEmpty()) {
            return new File(Environment.getExternalStorageDirectory(), configFolder)
                    .getAbsolutePath() + "/";
        } else {
            return null;
        }
    }

protected String getWallpaperDestinationPath() {
        String configFolder = getResourceString(com.death2all110.blisspapers.R.string.config_wallpaper_sdcard_dl_location);
        if (configFolder != null && !configFolder.isEmpty()) {
            return new File(Environment.getExternalStorageDirectory(), configFolder)
                    .getAbsolutePath();
        }
         couldn't find resource?
        return null;
    }

protected String getResourceString(int stringId) {
        return getApplicationContext().getResources().getString(stringId);
    }

public static String getResourceString(Context c, int id) {
        return c.getResources().getString(id);
    }

private class LoadWallpaperManifest extends
            AsyncTask<Void, Boolean, ArrayList<WallpaperCategory>> {

@Override
        protected ArrayList<WallpaperCategory> doInBackground(Void... v) {

try {
                InputStream input = null;

if (USE_LOCAL_MANIFEST) {
                    input = getApplicationContext().getAssets().open(MANIFEST);
                } else {
                    URL url = new URL(getResourceString(com.death2all110.blisspapers.R.string.config_wallpaper_manifest_url));
                    URLConnection connection = url.openConnection();
                    connection.connect();
                     this will be useful so that you can show a typical
                     0-100%
                     progress bar
                    int fileLength = connection.getContentLength();

 download the file
                    input = new BufferedInputStream(url.openStream());
                }
                OutputStream output = getApplicationContext().openFileOutput(
                        MANIFEST, MODE_PRIVATE);

byte data[] = new byte[1024];
                long total = 0;
                int count;
                while ((count = input.read(data)) != -1) {
                    total += count;
                     publishing the progress....
                     publishProgress((int) (total * 100 / fileLength));
                    output.write(data, 0, count);
                }

output.flush();
                output.close();
                input.close();

 file finished downloading, parse it!
                ManifestXmlParser parser = new ManifestXmlParser();
                return parser.parse(new File(getApplicationContext().getFilesDir(), MANIFEST),
                        getApplicationContext());
            } catch (Exception e) {
                Log.d(TAG, "Exception!", e);
            }
            return null;
        }

@Override
        protected void onPostExecute(ArrayList<WallpaperCategory> result) {
            categories = result;
            if (categories != null)
                loadPreviewFragment();

mLoadingDialog.cancel();
            super.onPostExecute(result);
        }
    }

}

Here is the activity_wallpaper.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

<View
        android:id="@+id/strut"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_centerHorizontal="true" />

<Button
        android:id="@+id/backButton"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignRight="@id/strut"
        android:layout_marginBottom="5dp"
        android:text="@string/back" />

<Button
        android:id="@+id/nextButton"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@id/strut"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_marginBottom="5dp"
        android:text="@string/next" />

<TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/backButton"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="5dp"
        android:text="@string/page" />

<LinearLayout
        android:id="@+id/LinearLayout1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@id/textView1"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginBottom="5dp"
        android:orientation="vertical" >

<android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="?android:attr/actionBarSize"
            android:background="?android:attr/colorPrimary" />

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:orientation="horizontal" >

<com.death2all110.blisspapers.ThumbnailView
                android:id="@+id/imageView1"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_marginBottom="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginTop="5dp"
                android:layout_weight="1" />

<com.death2all110.blisspapers.ThumbnailView
                android:id="@+id/imageView2"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_marginBottom="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginTop="5dp"
                android:layout_weight="1" />
        </LinearLayout>

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:orientation="horizontal" >

<com.death2all110.blisspapers.ThumbnailView
                android:id="@+id/imageView3"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_marginBottom="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginTop="5dp"
                android:layout_weight="1" />

<com.death2all110.blisspapers.ThumbnailView
                android:id="@+id/imageView4"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_marginBottom="5dp"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginTop="5dp"
                android:layout_weight="1" />
        </LinearLayout>
    </LinearLayout>

</RelativeLayout>

Style .xml:

<resources>

<style name="Theme.Bliss" parent="Theme.AppCompat.NoActionBar">
    <!-- Main theme colors -->
    <!--   your app branding color for the app bar -->
    <item name="colorPrimary">@color/primary</item>
    <!--   darker variant for the status bar and contextual app bars -->
    <item name="colorPrimaryDark">@color/primary_dark</item>
    <!--   theme UI controls like checkboxes and text fields -->
    <item name="colorAccent">@color/accent</item>
    </style>

</resources>

If I remove setContentView from the onCreate method, I get an error:

java.lang.NullPointerException: Attempts to call the virtual method “java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()” on an empty object reference

Any ideas on what I can do to correct this?

Screenshot:

You need to add android.supprt.v7.widget.Toolbar to the layout and then do so in the onCreate method of ActionBarActivity

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActitionBar(toolbar);

Also, make sure your theme uses Theme.AppCompat.NoActionBar

(or Theme.AppCompat.Light.NoActionBar).