PaintActivity.java

/*
Copyright (C) 2015 Haowen Ning

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
package org.liberty.android.fantastischmemo.ui;

import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.util.Base64;
import android.view.Display;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import com.simplify.ink.InkView;

import org.liberty.android.fantastischmemo.R;
import org.liberty.android.fantastischmemo.common.BaseActivity;

import java.io.ByteArrayOutputStream;

public class PaintActivity extends BaseActivity {

    private InkView inkView;

    private Handler handler = new Handler();

    @Override
    public void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        setContentView(R.layout.paint_screen);
        setTitle(R.string.paint_text);

        inkView = (InkView) findViewById(R.id.ink);
        inkView.setColor(Color.WHITE);
        inkView.setMinStrokeWidth(1.5f);
        inkView.setMaxStrokeWidth(6f);

        handler.post(new Runnable() {
             @Override
             public void run() {
                 Bitmap bitmap = loadBitmap();
                 if (bitmap != null) {
                     inkView.drawBitmap(bitmap, 0f, 0f, null);
                 }
             }
         });
    }

    @Override
    public void onDestroy() {
        saveBitmap(inkView.getBitmap());
        super.onDestroy();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu){
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.paint_screen_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.clear_menu_item:
                inkView.clear();
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private Bitmap loadBitmap() {
        SharedPreferences shre = PreferenceManager.getDefaultSharedPreferences(this);
        String previouslyEncodedImage = shre.getString("paint_image_data", "");

        if( !previouslyEncodedImage.equalsIgnoreCase("") ){
            byte[] b = Base64.decode(previouslyEncodedImage, Base64.DEFAULT);
            Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
            Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
            return mutableBitmap;
        }

        Display display = getWindowManager().getDefaultDisplay();
        @SuppressWarnings("deprecation")
        int width = display.getWidth();

        @SuppressWarnings("deprecation")
        int height = display.getHeight();

        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        return bitmap;
    }

    private void saveBitmap(Bitmap bitmap) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bitmap.compress(Bitmap.CompressFormat.PNG, 0, baos);
        byte[] b = baos.toByteArray();

        String encodedImage = Base64.encodeToString(b, Base64.DEFAULT);

        SharedPreferences shre = PreferenceManager.getDefaultSharedPreferences(this);
        SharedPreferences.Editor edit=shre.edit();
        edit.putString("paint_image_data",encodedImage);
        edit.commit();
    }

}