Example usage for android.graphics LinearGradient LinearGradient

Introduction

In this page you can find the example usage for android.graphics LinearGradient LinearGradient.

Prototype

public LinearGradient(float x0, float y0, float x1, float y1, @ColorInt int color0, @ColorInt int color1,
        @NonNull TileMode tile) 

Source Link

Document

Create a shader that draws a linear gradient along a line.

Usage

From source file:Main.java

/**
 * Creates an approximated cubic gradient using a multi-stop linear gradient. See
 * <a href="https://plus.google.com/+RomanNurik/posts/2QvHVFWrHZf">this post</a> for more
 * details./*from   w w w  .  j  a  v  a2  s  . com*/
 */
public static Drawable makeCubicGradientScrimDrawable(int baseColor, int numStops, int gravity) {

    // Generate a cache key by hashing together the inputs, based on the method described in the Effective Java book
    int cacheKeyHash = baseColor;
    cacheKeyHash = 31 * cacheKeyHash + numStops;
    cacheKeyHash = 31 * cacheKeyHash + gravity;

    Drawable cachedGradient = cubicGradientScrimCache.get(cacheKeyHash);
    if (cachedGradient != null) {
        return cachedGradient;
    }

    numStops = Math.max(numStops, 2);

    PaintDrawable paintDrawable = new PaintDrawable();
    paintDrawable.setShape(new RectShape());

    final int[] stopColors = new int[numStops];

    int red = Color.red(baseColor);
    int green = Color.green(baseColor);
    int blue = Color.blue(baseColor);
    int alpha = Color.alpha(baseColor);

    for (int i = 0; i < numStops; i++) {
        float x = i * 1f / (numStops - 1);
        float opacity = constrain(0, 1, (float) Math.pow(x, 3));
        stopColors[i] = Color.argb((int) (alpha * opacity), red, green, blue);
    }

    final float x0, x1, y0, y1;
    switch (gravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
    case Gravity.LEFT:
        x0 = 1;
        x1 = 0;
        break;
    case Gravity.RIGHT:
        x0 = 0;
        x1 = 1;
        break;
    default:
        x0 = 0;
        x1 = 0;
        break;
    }
    switch (gravity & Gravity.VERTICAL_GRAVITY_MASK) {
    case Gravity.TOP:
        y0 = 1;
        y1 = 0;
        break;
    case Gravity.BOTTOM:
        y0 = 0;
        y1 = 1;
        break;
    default:
        y0 = 0;
        y1 = 0;
        break;
    }

    paintDrawable.setShaderFactory(new ShapeDrawable.ShaderFactory() {
        @Override
        public Shader resize(int width, int height) {
            return new LinearGradient(width * x0, height * y0, width * x1, height * y1, stopColors, null,
                    Shader.TileMode.CLAMP);
        }
    });

    cubicGradientScrimCache.put(cacheKeyHash, paintDrawable);
    return paintDrawable;
}

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From source file:com.yoloo.android.util.ScrimUtil.java

/**
 * Creates an approximated cubic gradient using a multi-stop linear gradient. See
 * <a href="https://plus.google.com/+RomanNurik/posts/2QvHVFWrHZf">this post</a> for more
 * details./*w  w w .  jav a 2  s  .  c o m*/
 */
public static Drawable makeCubicGradientScrimDrawable(int baseColor, int numStops, int gravity) {

    // Generate a cache key by hashing together the inputs,
    // based on the method described in the Effective Java book
    int cacheKeyHash = baseColor;
    cacheKeyHash = 31 * cacheKeyHash + numStops;
    cacheKeyHash = 31 * cacheKeyHash + gravity;

    Drawable cachedGradient = cubicGradientScrimCache.get(cacheKeyHash);
    if (cachedGradient != null) {
        return cachedGradient;
    }

    numStops = Math.max(numStops, 2);

    PaintDrawable paintDrawable = new PaintDrawable();
    paintDrawable.setShape(new RectShape());

    final int[] stopColors = new int[numStops];

    final int red = Color.red(baseColor);
    final int green = Color.green(baseColor);
    final int blue = Color.blue(baseColor);
    final int alpha = Color.alpha(baseColor);

    for (int i = 0; i < numStops; i++) {
        float x = i * 1f / (numStops - 1);
        float opacity = MathUtils.constrain(0, 1, (float) Math.pow(x, 3));
        stopColors[i] = Color.argb((int) (alpha * opacity), red, green, blue);
    }

    final float x0, x1, y0, y1;
    switch (gravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
    case Gravity.START:
        x0 = 1;
        x1 = 0;
        break;
    case Gravity.END:
        x0 = 0;
        x1 = 1;
        break;
    default:
        x0 = 0;
        x1 = 0;
        break;
    }
    switch (gravity & Gravity.VERTICAL_GRAVITY_MASK) {
    case Gravity.TOP:
        y0 = 1;
        y1 = 0;
        break;
    case Gravity.BOTTOM:
        y0 = 0;
        y1 = 1;
        break;
    default:
        y0 = 0;
        y1 = 0;
        break;
    }

    paintDrawable.setShaderFactory(new ShapeDrawable.ShaderFactory() {
        @Override
        public Shader resize(int width, int height) {
            return new LinearGradient(width * x0, height * y0, width * x1, height * y1, stopColors, null,
                    Shader.TileMode.CLAMP);
        }
    });

    cubicGradientScrimCache.put(cacheKeyHash, paintDrawable);
    return paintDrawable;
}

---

From source file:com.example.google.maps.dataviz.MainActivity.java

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

    // The gradient for colouring the markers.
    Shader shader = new LinearGradient(0, 0, 0, MARKER_HEIGHT - 1, new int[] { Color.BLUE, Color.RED }, null,
            TileMode.CLAMP);//from   w ww .j a v a 2  s  . c  o m
    mPaint = new Paint();
    mPaint.setShader(shader);

    mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();

    if (mMap != null) {
        setUpMap();
    }
}

---

From source file:org.mariotaku.twidere.view.ProfileBannerImageView.java

@SuppressLint("DrawAllocation")
@Override/*from w w  w.j  a  v a 2 s.com*/
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
    final int width = MeasureSpec.getSize(widthMeasureSpec), height = width / 2;
    setMeasuredDimension(width, height);
    if (width > 0) {
        mShader = new LinearGradient(width / 2, 0, width / 2, height, COLORS, POSITIONS, Shader.TileMode.CLAMP);
    }
    super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
}

---

From source file:org.wikipedia.page.shareafact.SnippetImage.java

private static void drawGradient(@NonNull Canvas canvas) {
    // draw a dark gradient over the image, so that the white text
    // will stand out better against it.
    final int gradientStartColor = 0x60000000;
    final int gradientStopColor = 0xA0000000;
    Shader shader = new LinearGradient(0, 0, 0, canvas.getHeight(), gradientStartColor, gradientStopColor,
            Shader.TileMode.CLAMP);/*w  ww  .  jav  a2  s .  c  o m*/
    Paint paint = new Paint();
    paint.setShader(shader);
    canvas.drawRect(new Rect(0, 0, canvas.getWidth(), canvas.getHeight()), paint);
}

---

From source file:com.bangalore.barcamp.BCBUtils.java

public static void createActionBarOnActivity(final Activity activity, boolean isHome) {
    // ******** Start of Action Bar configuration
    ActionBar actionbar = (ActionBar) activity.findViewById(R.id.actionBar1);
    actionbar.setHomeLogo(R.drawable.home);
    actionbar.setHomeAction(new Action() {
        @Override//from   w ww.  j ava 2  s . c  o  m
        public void performAction(View view) {
            ((SlidingMenuActivity) activity).toggle();
        }

        @Override
        public int getDrawable() {
            return R.drawable.home;
        }
    });

    actionbar.setTitle(R.string.app_title_text);
    TextView logo = (TextView) activity.findViewById(R.id.actionbar_title);
    Shader textShader = new LinearGradient(0, 0, 0, logo.getHeight(), new int[] { Color.WHITE, 0xff999999 },
            null, TileMode.CLAMP);
    logo.getPaint().setShader(textShader);
    actionbar.setOnTitleClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

        }
    });
    // ******** End of Action Bar configuration

}

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From source file:com.cmtv.tv.widget.pagerindicator.TabPageIndicator.java

public TabPageIndicator(Context context, AttributeSet attrs) {
    super(context, attrs);
    setHorizontalScrollBarEnabled(false);

    //custom//w  ww.  j av a 2 s .co m
    mContext = context;
    this.mTextFocusColor = context.getResources().getColor(R.color.tab_view_indicator_focus_color);
    this.mFocusedShader = new LinearGradient(0.0f, 0.0f, 0.0f, 50.0f, mTextFocusColor, mTextFocusColor,
            Shader.TileMode.CLAMP);
    this.mNormalShader = new LinearGradient(0.0f, 0.0f, 0.0f, 40.0f, Color.WHITE, Color.GRAY,
            Shader.TileMode.CLAMP);

    mTabLayout = new IcsLinearLayout(context, R.attr.vpiTabPageIndicatorStyle);
    addView(mTabLayout, new ViewGroup.LayoutParams(WRAP_CONTENT, MATCH_PARENT));
}

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From source file:org.kei.android.phone.cellhistory.fragments.NetworkFragment.java

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    prefs = PreferenceManager.getDefaultSharedPreferences(getActivity().getBaseContext());
    chartSeparator = (LinearLayout) getView().findViewById(R.id.chartSeparator);
    txtTxBytesSinceAppStart = (TextView) getView().findViewById(R.id.txtTxBytesSinceAppStart);
    txtRxBytesSinceAppStart = (TextView) getView().findViewById(R.id.txtRxBytesSinceAppStart);
    txtDataConnectivity = (TextView) getView().findViewById(R.id.txtDataConnectivity);
    txtDataActivity = (TextView) getView().findViewById(R.id.txtDataActivity);
    txtTheoreticalSpeed = (TextView) getView().findViewById(R.id.txtTheoreticalSpeed);
    txtIp4Address = (TextView) getView().findViewById(R.id.txtIp4Address);
    txtIp6Address = (TextView) getView().findViewById(R.id.txtIp6Address);
    defaultColor = new TextView(getActivity()).getTextColors().getDefaultColor();
    redColor = getResources().getColor(R.color.red);
    greenColor = getResources().getColor(R.color.green);
    orangeColor = getResources().getColor(R.color.orange_dark);
    gradientColor = new LinearGradient(180, 0, 0, 0, new int[] { greenColor, redColor }, new float[] { 0, 1 },
            TileMode.CLAMP);// w  ww  .  java  2 s. c o  m

    chart = new TimeChartHelper();
    chart.setChartContainer((LinearLayout) getView().findViewById(R.id.graph));
    chart.setFrequency(Integer.parseInt(
            prefs.getString(PreferencesTimers.PREFS_KEY_TIMERS_UI, PreferencesTimers.PREFS_DEFAULT_TIMERS_UI)));
    chart.install(getActivity(), txtDataConnectivity.getTextColors().getDefaultColor(), false, 2, true);
    try {
        processUI(CellHistoryApp.getApp(getActivity()).getGlobalTowerInfo());
    } catch (Throwable e) {
        Log.e(getClass().getSimpleName(), "Exception: " + e.getMessage(), e);
    }
}

---

From source file:de.vanita5.twittnuker.view.ProfileBannerImageView.java

@SuppressLint("DrawAllocation")
@Override/*from   w w w .j  ava  2 s.c  o  m*/
protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
    final int width = MeasureSpec.getSize(widthMeasureSpec), height = width / 3;
    setMeasuredDimension(width, height);
    if (width > 0) {
        mShader = new LinearGradient(width / 2, 0, width / 2, height, COLORS, POSITIONS, Shader.TileMode.CLAMP);
    }
    super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
}

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From source file:org.zeroxlab.benchmark.Benchmark.java

public static Shader createGradient() {
    Random random = new Random();
    int color1 = (0x33252525 | random.nextInt());
    int color2 = (0x33252525 | random.nextInt());
    int color3 = (0x33252525 | random.nextInt());
    LinearGradient lg = new LinearGradient(0, 0, 100, 100, new int[] { color1, color2, color3 }, null,
            Shader.TileMode.REPEAT);/*from  ww  w.  ja va2  s  .c  o  m*/
    return lg;
}

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