Android Open Source - LikeYahooWeather Pre Blur Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.moshdev.likeyahooweather;
//w ww .  j a v  a2 s .  c  om
import android.annotation.SuppressLint;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ScrollView;

import com.moshdev.likeyahooweather.adapter.BlurListAdapter;
import com.moshdev.likeyahooweather.utils.ImageUtils;

public class PreBlurActivity extends ActionBarActivity {

  private ImageView blurredImageView;
  private ImageView nonBlurImageView;

  private ListView listView;
  private ScrollView scrollView;
  private View titleView;

  @SuppressLint("InlinedApi")
  @Override
  protected void onCreate(Bundle savedInstanceState) {

    requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_runtime_blur);

    initActionBar();

    intImages();

    initList();

    listenToScroll();

    titleView = findViewById(R.id.title_bg);

  }

  private void initActionBar() {
    ActionBar actionBar = getSupportActionBar();
    actionBar.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    actionBar.setDisplayShowTitleEnabled(false);
  };

  private void intImages() {

    int screenHeight = ImageUtils.getScreenHeight(this)
        + MainActivity.BACKGROUND_SHIFT;

    blurredImageView = (ImageView) findViewById(R.id.blured_image);
    blurredImageView.setImageResource(R.drawable.bg1_blurred);
    nonBlurImageView = (ImageView) findViewById(R.id.orginal_image);

    setViewHeight(nonBlurImageView, screenHeight);
    setViewHeight(blurredImageView, screenHeight);

  }

  private void initList() {
    listView = (ListView) findViewById(R.id.list);
    listView.setAdapter(new BlurListAdapter(this));

    scrollView = (ScrollView) findViewById(R.id.bgScrollView);
  }

  public void setViewHeight(View v, int height) {
    LayoutParams params = v.getLayoutParams();
    params.height = height;
    v.setLayoutParams(params);
  }

  @SuppressLint("NewApi")
  public void setTitleAlpha(float val) {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      titleView.setAlpha(val);
    } else {
      int m = (int) (val * 255);
      titleView.setAlpha(m);
    }
  }

  @SuppressLint("NewApi")
  private void listenToScroll() {

    listView.setOnScrollListener(new AbsListView.OnScrollListener() {

      @Override
      public void onScrollStateChanged(AbsListView view, int scrollState) {

      }

      @SuppressWarnings("deprecation")
      @Override
      public void onScroll(AbsListView view, int firstVisibleItem,
          int visibleItemCount, int totalItemCount) {

        View v = view.findViewById(R.id.id0);
        if (v != null) {
          int scrollY = -v.getTop();

          if (scrollY < 512 && scrollY >= 0) {

            float val = 0;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
              val = scrollY * (1f / 512f);
              blurredImageView.setAlpha(val);
            } else {
              val = scrollY / 2;
              blurredImageView.setAlpha((int) val);

            }
            setTitleAlpha(val);
          }
          if (scrollY < MainActivity.BACKGROUND_SHIFT * 2
              && scrollY >= 0) {
            scrollView.scrollTo(0, scrollY / 3);
          }
        }

      }
    });
  }
}

Java Source Code List

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