Develop Reference

Card View background color affects shadow color

I have my Card View set up like this:
android:layout_marginTop="2dp"
android:layout_marginLeft="6dp"
android:layout_marginRight="6dp"
card_view:cardCornerRadius="2dp"
card_view:cardElevation="6dp"
card_view:cardUseCompatPadding="true"
card_view:contentPadding="10p"
Without a background color my Card View looks perfect like this:
However, when I add the simple property:
card_view:cardBackgroundColor="#xxxxxxxx"
the shadows change significantly in terms of color, transparency, blur etc.
How might I go about fixing this? I tried using a RelativeLayout as the background and changing the color there, so it wouldn't affect the shadows... but that affected the rounded corners.
Any ideas? Thanks for the help!

I ran into the exact same problem and solved it by removing the alpha portion of my hex code.
Example: #AA333333 removing the AA. Of course use the hex color that you need without the alpha.

Your idea of RelativeLayout is a good one. Instead of placing the card view in RelativeLayout, add RelativeLayout as CardView child, and than add its content to RelativeLayout, in your case it look like you got single child: TextView.
So change your TextView background color or place it in a RelativeLayout and change RelativeLayout background color.

As a workaround, since the alpha is the problem, you can try to brigthen the card color (or blend it with the underlying color)
ColorUtils.blendARGB(yourCardColor, Color.WHITE, 0.2f)

Instead of that, set android:background="#hexColor"

MPAndroidChart - Set a background image [duplicate]

I'm using the amazing library MPAndroidChart. It works like a charm, except when I'm trying to change the background color of the BarData. Default color is white, and I want to change it to Transparent.
I've tried this :
Paint p1 = mChart.getPaint(Chart.PAINT_GRID_BACKGROUND);
p1.setColor(Color.RED);
and this:
<com.github.mikephil.charting.charts.BarChart
android:id="#+id/chart1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/transparent"/>
... but it seems that doesnt works.
Any ideas ?
Thanks =)

Since release v1.6.5, the background of the Chart is transparent by default. Meaning, that everything in the background (chart background, other Views, etc.) that is not overlayed by data drawn into the Chart, will be visible.
If you want to change the background (color, or maybe drawable), you can either do that by changing the chart-background
in .xml (android:background="...")
by calling setBackgroundColor(...) or setBackgroundResource(...)
Another way could be to change the background of the parent layout that contains the Chart.

Code to change Background color:
chart.setBackgroundColor(Color.TRANSPARENT); //set whatever color you prefer
chart.setDrawGridBackground(false);// this is a must

if you want to Change Whole Screen Background Color
Barchart chart;
chart.setBackgroundColor(Color.rgb(0, 0, 0));//Set as a black
chart.setDrawGridBackground(false);//set this to true to draw the grid background, false if not
Happy to help Thanks

So, after some research, I've found that it's not possible yet: https://github.com/PhilJay/MPAndroidChart/issues/53
Hope It will be possible soon ! =)

MPAndroidChart white Background

I am using the MPAndroidChart library. I am setting the multi line chart with data using MPAndroidChart. It's working great but the background is coming white. This is what i am doing
nhChart = new LineChart(getActivity());
nhChart.setDescription("Number of Hits View");
nhChart = (LineChart) hitsView.findViewById(R.id.line_chart_number_of_hits);
//int color = Color.parseColor("#80101010");
nhChart.setBackgroundColor(Color.parseColor("#80101010"));
//nhChart.setBackgroundResource(R.drawable.background_portrate);
//nhChart.setBackground(getResources().getDrawable(R.drawable.background_portrate));
nhChart.setStartAtZero(true);
nhChart.setDrawBorder(true);
nhChart.setNoDataTextDescription("No Data available for Charts");
nhChart.setDrawYValues(false);
nhChart.setDrawBorder(true);
nhChart.setScaleEnabled(true);
nhChart.setHighlightEnabled(false);
nhChart.setTouchEnabled(true);
//nhChart.setGridColor(Color.WHITE & 0x70FFFFFF);
//nhChart.setDragScaleEnabled(true);
nhChart.setPinchZoom(true);
setData(valueDate.size(),10000);
nhChart.animateX(2500);
Legend l = nhChart.getLegend();
l.setForm(LegendForm.CIRCLE);
l.setFormSize(6f);
l.setTextColor(Color.WHITE);
YLabels y = nhChart.getYLabels();
y.setTextColor(Color.WHITE);
y.setLabelCount(6);
XLabels x1 = nhChart.getXLabels();
x1.setCenterXLabelText(true);
x1.setPosition(XLabelPosition.BOTTOM);
x1.setTextColor(Color.WHITE);
I am plotting line graphs in post execute method of AsyncTask in a fragment viewpager. Other fragment showing the graph shows the same white background. I tried setting a color for the background but nothing works. I also left it blank, but its still showing me the white background. I also updated the latest Jar but its not works. Please help.
Here is the image how it looks

You want this for transparent:
chart.setDrawGridBackground(false);
And this for transparent bar:
chart.setDrawBarShadow(false);

Well by default, the backgroud of the chart is transparent which means that it will have whatever color you set for the view/layout below the chart.
If you want to change the background (color, or maybe drawable), you can do that in the following ways:
in .xml (android:background="...")
--> set the background color of the chart in xml or set the backgroud color of the layout the chart is in.
by calling setBackgroundColor(...) or setBackgroundResource(...)
I guess you want your background to be some kind of black?
What happens if you call:
chart.setBackgroundColor(Color.BLACK)?
Does setting the background-color work then? Also check the example code in the github repo here. There are some cases in the example app that change the background color.

You can do this with:
chart.setBackgroundColor(getResources().getColor(R.color.transparent));
Please define first:
<color name="transparent">#00000000</color>

How to make TextView's background to be transparent?

There is a tablelayout having four tablerows, the first tablerow contains a TextView :
As you can see the background of the TextView having the text "Vidy" is seen ! So how to make it transparent ? I tried to add android:alpha="0" to the attribute of the TextView but at runtime the text is not seen !

You can try:
android:background="#null"
Or:
android:background="#android:color/transparent"
Check also: Android Transparent TextView?

If you really need transparency, #Nermeen's answer is great, you can also get it done programmatically like:
myTextView.setBackgroundColor(Color.TRANSPARENT);
but as long as you have solid background color below, it's better due to performance to make your TextView's background color the same as the layout below (with alpha, app needs to redraw more regions). It won't really matter for such a simple layout, but it's worth remembering when you have many of them using transparency.

android change view's background color when state changes

how to use color state list for background?
I know android:background="#drawable/drawable_selector", but android:background="#color/color_selector" will cause exceptions.
but android:background="#FFFFFF" works again, can anyone explains why?
now i want to change a layout's background color(not a drawable) when it's pressed,
how to do it?

dynamically you can change like this. Use this if it is useful for you -
textView.setBackgroundColor(Color.parseColor(getResources().getString(R.string.red)));

put the color in res/values/colors.xml,
like #FFFFFF,
and then create a drawable xml in drawable directory,
,that is ok.