How to add view programmatically

Question

I would like to do this vertical line programmatically

<View
 android:layout_width="fill_parent"
 android:layout_height="1dp"
 android:background="@android:color/darker_gray"/>

This is how I create the view:

View view = new View(getActivity());

How can I add the width, height and background parameters?

• Anukool: You can inflate the view and then add it to the parent. Also you can set the parameters using LayoutParams .
• Waqleh: yes but how every time i try to use LayoutParams I get a message about deprecation
• Anukool: Try using match_parent instead of fill_parent. May be because of fill_parent you are getting the deprecation message,
• CRUSADER: change android:layout_width="fill_parent" to android:layout_width="match_parent",, that depreciation will go..

Answer 1

Try this

View v = new View(activityContext);
v.setLayoutParams(new TableRow.LayoutParams(LayoutParams.FILL_PARENT), GetPixel(1, activityContext));
v.setBackgroundColor(getResources().getColor(android.R.color.darker_gray));

and

// To convert pixels to dp units
public int GetPixel(float f , Context context)
 {
 DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
 return (int)((f * displayMetrics.density) + 0.5f);
 }

• Chase Roberts: Your method is called GetPixel (implying that the input is dp and output is dp), but your comment says that input is pixels and output is dp.

Answer 2

you can also use this:

View mView = new View(Context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
myLInearLayout.setOrientation(LinearLayout.VERTICAL);
mView .setLayoutParams(params);
mView.setBackgroundResource(android.R.color.white);
myLInearLayout.addView(mView);

Answer 3

Heres an example :

View mView = new View(mContext);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
mView.setBackgroundResource(android.R.color.black);
mRelativeLayout.addView(mView, params);

Answer 4

Let me explain it with example.

Here's xml file which contains LinearLayout.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/ll" android:gravity="center"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >
</LinearLayout>

Your JAVA file.

@Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.second);
 float dpi = 0;
 LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
 DisplayMetrics dm = new DisplayMetrics();
 getWindowManager().getDefaultDisplay().getMetrics(dm);
 dpi = (float) (dm.densityDpi / 160.0);
 LinearLayout linear = new LinearLayout(
 StackOverflowAnswerDemoActivity.this);
 LayoutParams params = new LayoutParams(LayoutParams.FILL_PARENT,
 (int) (1 * dpi));
 linear.setBackgroundColor(Color.WHITE);
 linear.setLayoutParams(params);
 ll.addView(linear);
}

enter image description here

Answer 5

The best option if you already have an XML file is not to make changes in code but to use LayoutInflater