Android Open Source - Jaguar Main Activity

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Back to project page Jaguar.

License

The source code is released under:

Apache License

Java Source Code

package com.richard.jaguar;
/* www  .j a  v a 2s  .  c  om*/
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

import com.readystatesoftware.systembartint.SystemBarTintManager;
public class MainActivity extends ActionBarActivity implements OnScrollChangedCallback{
    private Toolbar mToolbar;
    private Drawable mActionBarBackgroundDrawable;
    private View mHeader;
    private int mLastDampedScroll;
    private int mInitialStatusBarColor;
    private int mFinalStatusBarColor;

    private SystemBarTintManager mStatusBarManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mToolbar = (Toolbar) findViewById(R.id.toolbar);
        mActionBarBackgroundDrawable = mToolbar.getBackground();
        setSupportActionBar(mToolbar);

        mStatusBarManager = new SystemBarTintManager(this);
        mStatusBarManager.setStatusBarTintEnabled(true);
        mInitialStatusBarColor = Color.BLACK;
        mFinalStatusBarColor = getResources().getColor(R.color.colorPrimaryDark);

        mHeader = findViewById(R.id.header);

        ObservableScrollable scrollView = (ObservableScrollable) findViewById(R.id.scroll_view);
        scrollView.setOnScrollChangedCallback(this);

        onScroll(-1, 0);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onScroll(int l, int scrollPosition) {
        int headerHeight = mHeader.getHeight() - mToolbar.getHeight();
        float ratio = 0;
        if (scrollPosition > 0 && headerHeight > 0)
            ratio = (float) Math.min(Math.max(scrollPosition, 0), headerHeight) / headerHeight;

        updateActionBarTransparency(ratio);
        updateStatusBarColor(ratio);
        updateParallaxEffect(scrollPosition);
    }

    private void updateActionBarTransparency(float scrollRatio) {
        int newAlpha = (int) (scrollRatio * 255);
        mActionBarBackgroundDrawable.setAlpha(newAlpha);
        mToolbar.setBackgroundDrawable(mActionBarBackgroundDrawable);
    }

    private void updateStatusBarColor(float scrollRatio) {
        int r = interpolate(Color.red(mInitialStatusBarColor), Color.red(mFinalStatusBarColor), 1 - scrollRatio);
        int g = interpolate(Color.green(mInitialStatusBarColor), Color.green(mFinalStatusBarColor), 1 - scrollRatio);
        int b = interpolate(Color.blue(mInitialStatusBarColor), Color.blue(mFinalStatusBarColor), 1 - scrollRatio);
        mStatusBarManager.setTintColor(Color.rgb(r, g, b));
    }

    private void updateParallaxEffect(int scrollPosition) {
        float damping = 0.5f;
        int dampedScroll = (int) (scrollPosition * damping);
        int offset = mLastDampedScroll - dampedScroll;
        mHeader.offsetTopAndBottom(-offset);

        mLastDampedScroll = dampedScroll;
    }

    private int interpolate(int from, int to, float param) {
        return (int) (from * param + to * (1 - param));
    }
}

Java Source Code List

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