Last Updated: October 21, 2015

Android support v7 palette demo

Description: In this post I'm gonna show you how to use android's support library v7 palette for extracting color from bitmap. Its can have variety of use-cases like making the background of the profile image somewhat similar to profile image or changing the whole UI as per the bitmap into the screen. Really Awesome !!!

Github project here


Step 1: Add this into build.gradle.

compile 'com.android.support:palette-v7:+'


Step 2: Pass the bitmap into palette to get List<Palette.Swatch> as shown below.

Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
    @Override    public void onGenerated(Palette palette) {
        swatchesList = palette.getSwatches();

        }
    }
});




Step 3: Here we have used CountDownTimer to display the RGB of the bitmap into the background of parent layout after the interval of 1sec. As shown below

mainContainer.setBackground(AppUtils.createGradient(swatch.getRgb()));

Steps 4: Lets combine everything :-)


public class MainActivity extends AppCompatActivity implements INotifyTimer {

    private static final String TAG = MainActivity.class.getName();

    private List<Palette.Swatch> swatchesList;
    private CountDownTimerPalette countDownTimer;

    private int size ;

    private RelativeLayout mainContainer;
    private ImageView circularImageView;

    @Override    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        init();

        extractColorFromBitmap();
    }

    private void init() {
        mainContainer = (RelativeLayout)findViewById(R.id.mainContainer);
        circularImageView = (ImageView)findViewById(R.id.circularImageView);
    }

    private void extractColorFromBitmap() {

        Bitmap bitmap = AppUtils.getCircleBitmap(BitmapFactory.decodeResource(MainActivity.this.getResources(), R.mipmap.capture_palette));
        circularImageView.setImageBitmap(bitmap);

        Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
            @Override            public void onGenerated(Palette palette) {
                swatchesList = palette.getSwatches();

                if (swatchesList != null && swatchesList.size() > 0) {
                    countDownTimer = new CountDownTimerPalette(1000 * swatchesList.size(), 1000, MainActivity.this);
                    countDownTimer.start();
                }
            }
        });
    }

    @Override    public void onTick(int tick) {

        Palette.Swatch swatch = swatchesList.get(tick - 1);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mainContainer.setBackground(AppUtils.createGradient(swatch.getRgb()));
        }else {
            mainContainer.setBackgroundDrawable(AppUtils.createGradient(swatch.getRgb()));
        }

    }

    @Override    public void onFinish() {
        countDownTimer.start();
    }


    @Override    protected void onDestroy() {
        super.onDestroy();

        if (countDownTimer != null){
            countDownTimer.cancel();
        }
    }

}


Output:

 

Last Updated: October 14, 2015

Android Multiple row layout using RecyclerView

Description: In this post I'm gonna show you how we can have multiple row layout in Android's Material Design  RecyclerView  using   getItemViewType.

compile 'com.android.support:cardview-v7:23.0.0'
compile 'com.android.support:recyclerview-v7:23.0.0'

GitHub Project HERE

So lets get started :-)


Step 1:
Create Recycler Adapter by overriding getItemViewType method and giving the type for different layout as shown below.


@Override

public int getItemViewType(int position) {

    MultipleRowModel multipleRowModel = multipleRowModelList.get(position);

    if (multipleRowModel != null)
        return multipleRowMod.type;

    return super.getItemViewType(position);
}
Step 2: Create a viewHolder as per viewType .  We can create different row layout using viewType .

Note: viewType in onCreateviewholder is retured from getItemViewType in Step 1.
@Override
public MultipleRowViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View view = null;

    if (viewType == AppConstant.FIRST_ROW)
        view = inflater.inflate(R.layout.view_row_first, parent, false);
    else if (viewType == AppConstant.OTHER_ROW)
        view = inflater.inflate(R.layout.view_row_other, parent, false);

    return new MultipleRowViewHolder(view, viewType);
}

Step 3: Lets integrated all this in one RecyclerView adapter.

public class MultipleRowAdapter extends RecyclerView.Adapter<MultipleRowViewHolder> {

    private LayoutInflater inflater = null;
    private List<MultipleRowModel> multipleRowModelList;

    public MultipleRowAdapter(Context context, List<MultipleRowModel> multipleRowModelList){
        this.multipleRowModelList = multipleRowModelList;
        inflater = LayoutInflater.from(context);
    }

    @Override
    public MultipleRowViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View view = null;

        if (viewType == AppConstant.FIRST_ROW)
            view = inflater.inflate(R.layout.view_row_first, parent, false);
        else if (viewType == AppConstant.OTHER_ROW)
            view = inflater.inflate(R.layout.view_row_other, parent, false);

        return new MultipleRowViewHolder(view, viewType);
    }

    @Override
    public void onBindViewHolder(MultipleRowViewHolder holder, int position) {
        holder.multipleContent.setText(multipleRowModelList.get(position).modelContent);
    }

    @Override
    public int getItemCount() {
        return (multipleRowModelList!= null && multipleRowModelList.size() > 0 ) ? multipleRowModelList.size() : 0;
    }

    @Override
    public int getItemViewType(int position) {

        MultipleRowModel multipleRowModel = multipleRowModelList.get(position);

        if (multipleRowModel != null)
            return multipleRowModel.type;

        return super.getItemViewType(position);
    }

}



Step 4: Finally our MainActivity looks something like this.

public class MainActivity extends AppCompatActivity {

    private RecyclerView multipleRowRecyclerView;
    private MultipleRowAdapter multipleRowAdapter;

    private List<MultipleRowModel> multipleRowModelList = new ArrayList<>();

    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        multipleRowRecyclerView = (RecyclerView)findViewById(R.id.multipleRowRecyclerView);
        multipleRowRecyclerView.setHasFixedSize(true);

        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, OrientationHelper.VERTICAL, false);
        multipleRowRecyclerView.setLayoutManager(linearLayoutManager);
        multipleRowRecyclerView.setItemAnimator(new DefaultItemAnimator());

        fillAdapter();

        multipleRowAdapter = new MultipleRowAdapter(MainActivity.this, multipleRowModelList);

        multipleRowRecyclerView.setAdapter(multipleRowAdapter);
    }

    private void fillAdapter() {

        int type;

        String content;

        for (int i = 0; i < 10; i++) {

            if (i == 0 || i == 5 || i == 9) {
                type = AppConstant.FIRST_ROW;
                content = "Type 1: This is Multiple row layout";
            } else {
                type = AppConstant.OTHER_ROW;
                content = "Type 2";
            }

            multipleRowModelList.add(new MultipleRowModel(type , content));
        }
    }
}


GitHub Project HERE

Sample Output :