I am developing Android v2.2 app.
I have a Fragment
. In the onCreateView(...)
callback of my fragment class, I inflate an layout to the fragment like below:
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.login, null);
return view;
}
The above inflated layout file is (login.xml):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Username" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Username" />
</LinearLayout>
I would like to set a paddingTop
to the above <LinearLayout>
element , and I want to do it in the Java code instead of do it in xml.
How to set paddingTop
to <LinearLayout>
in my fragment Java class code ??
This question is related to
android
android-layout
android-emulator
android-widget
padding
The best way is not to write your own funcion.
Let me explain the motivaion - please lookup the official Android source code.
In TypedValue.java
we have:
public static int complexToDimensionPixelSize(int data,
DisplayMetrics metrics)
{
final float value = complexToFloat(data);
final float f = applyDimension(
(data>>COMPLEX_UNIT_SHIFT)&COMPLEX_UNIT_MASK,
value,
metrics);
final int res = (int) ((f >= 0) ? (f + 0.5f) : (f - 0.5f));
if (res != 0) return res;
if (value == 0) return 0;
if (value > 0) return 1;
return -1;
}
and:
public static float applyDimension(int unit, float value,
DisplayMetrics metrics)
{
switch (unit) {
case COMPLEX_UNIT_PX:
return value;
case COMPLEX_UNIT_DIP:
return value * metrics.density;
case COMPLEX_UNIT_SP:
return value * metrics.scaledDensity;
case COMPLEX_UNIT_PT:
return value * metrics.xdpi * (1.0f/72);
case COMPLEX_UNIT_IN:
return value * metrics.xdpi;
case COMPLEX_UNIT_MM:
return value * metrics.xdpi * (1.0f/25.4f);
}
return 0;
}
As you can see, DisplayMetrics metrics
can differ, which means it would yield different values across Android-OS powered devices.
I strongly recommend putting your dp padding in dimen xml file and use the official Android conversions to have consistent behaviour with regard to how Android framework works.
Using TypedValue
is a much cleaner way of converting to pixels compared to manually calculating:
float paddingDp = 10f;
// Convert to pixels
int paddingPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, paddingDp, context.getResources().getDisplayMetrics());
view.setPadding(paddingPx, paddingPx, paddingPx, paddingPx);
Essentially, TypedValue.applyDimension
converts the desired padding into pixels appropriately depending on the current device's display properties.
For more info see: TypedValue.applyDimension Docs.
If you store the padding in resource files, you can simply call
int padding = getResources().getDimensionPixelOffset(R.dimen.padding);
It does the conversion for you.
Using Kotlin and the android-ktx library, you can simply do
view.updatePadding(top = 42)
To answer your second question:
view.setPadding(0,padding,0,0);
like SpK and Jave suggested, will set the padding in pixels. You can set it in dp by calculating the dp value as follows:
int paddingDp = 25;
float density = context.getResources().getDisplayMetrics().density
int paddingPixel = (int)(paddingDp * density);
view.setPadding(0,paddingPixel,0,0);
Hope that helps!
You can set padding to your view by pro grammatically throughout below code -
view.setPadding(0,1,20,3);
And, also there are different type of padding available -
These, links will refer Android Developers site. Hope this helps you lot.
Context contect=MainActivity.this;
TextView tview=new TextView(context);
tview.setPaddingRelative(10,0,0,0);
While padding programmatically, convert to density related values by converting pixel to Dp.
Write Following Code to set padding, it may help you.
TextView ApplyPaddingTextView = (TextView)findViewById(R.id.textView1);
final LayoutParams layoutparams = (RelativeLayout.LayoutParams) ApplyPaddingTextView.getLayoutParams();
layoutparams.setPadding(50,50,50,50);
ApplyPaddingTextView.setLayoutParams(layoutparams);
Use LinearLayout.LayoutParams
or RelativeLayout.LayoutParams
according to parent layout of the child view
use below method for setting padding dynamically
setPadding(int left, int top, int right, int bottom)
Example :
view.setPadding(2,2,2,2);
Source: Stackoverflow.com