Custom View Extending Relative Layout

Question

package com.binod.customviewtest;

import android.content.Context;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;

public class CustomView extends RelativeLayout{

    public CustomView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub

//      LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        LayoutInflater mInflater = LayoutInflater.from(context);
        mInflater.inflate(R.layout.custom_view  , this, true);
    }

}

Including as

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <com.binod.customviewtest.CustomView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        ></com.binod.customviewtest.CustomView>

</RelativeLayout>

Custom View as

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

Just started adding a new custom view and got the error once If I clear this then can move forward

I am getting crash "Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class"

Do you have other constructors as well and post the package name for the customview and the xml in which you have the custom view — Raghunandan, Apr 01 '14 at 07:30

score 44 · Accepted Answer · edited May 23 '17 at 10:31

You need to have 2 more constructors. To know why

Do I need all three constructors for an Android custom view?

public class CustomView extends RelativeLayout{

    LayoutInflater mInflater;
    public CustomView(Context context) {
        super(context);
         mInflater = LayoutInflater.from(context);
         init(); 

    }
    public CustomView(Context context, AttributeSet attrs, int defStyle)
    {
    super(context, attrs, defStyle);
    mInflater = LayoutInflater.from(context);
    init(); 
    }
    public CustomView(Context context, AttributeSet attrs) {
    super(context, attrs);
    mInflater = LayoutInflater.from(context);
    init(); 
    }
   public void init()
   {
       View v = mInflater.inflate(R.layout.custom_view, this, true);
       TextView tv = (TextView) v.findViewById(R.id.textView1);
   tv.setText(" Custom RelativeLayout");
   }
}

I am posting an example. My packagename is different

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
<com.example.testall.CustomView
        android:id="@+id/timer1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</RelativeLayout>

custom_view.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="60dp"
        android:text="My Custom View" />

</RelativeLayout>

MainActivity.java

public class MainActivity extends Activity {

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

Snap

enter image description here

As pskink suggested there in a RelativeLayout in activity_main.xml with a child CustomView. Then CustomView extends RealtiveLayout and then again you inflate a customview with RelativeLayout and a child TextView. No need for all these. Just a CustomView. Have a TextView created programatically and then add textview to RelativeLayout

Edit:

activity_main.xml

<com.example.testall.CustomView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/timer1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

CustomView

public class CustomView extends RelativeLayout{

    TextView tv;
    public CustomView(Context context) {
        super(context);
         tv = new TextView(context);
         init(); 

    }
    public CustomView(Context context, AttributeSet attrs, int defStyle)
    {
    super(context, attrs, defStyle);
    tv = new TextView(context);
    init(); 
    }
    public CustomView(Context context, AttributeSet attrs) {
    super(context, attrs);
    tv = new TextView(context);
    init(); 
    }
   public void init()
   {
       this.addView(tv);
       tv.setText(" Custom RelativeLayout");
   }
}

@Raghunandan and instead of one RelativeLayout you will end up with *three* RelativeLayouts — pskink, Apr 01 '14 at 08:32
@pskink edited but i wanted to point out about constructors. Any way you are right about relativelayouts and thats unnecessary. — Raghunandan, Apr 01 '14 at 08:37
@binod do check the edit. No need to 3 RelativeLayouts you can even align the textview and set properties to the same — Raghunandan, Apr 01 '14 at 08:44
First snippet of code could be updated. Instead of calling super, call this() until the the final constructor is called. Inflate the view there. "v" is never created in your snippet, though it is obvious it is to be returned by the inflator which you are unnecessarily holding a reference to. Removes the need for "init" and holding references that are not needed. — BajaBob, Jul 21 '15 at 01:17
@BajaBob yup you could do that. i missed that in the first and yes the second customview can also be improved — Raghunandan, Jul 21 '15 at 04:55

score 0 · Answer 2 · answered Apr 01 '14 at 07:43

0

Try to get Activity and use this

 {
    LayoutInflater inflter = activity.getLayoutInflater();
    View v = inflter.inflate(R.layout.custom_view,null);
    this.addView(v); or addView(v);
    }

answered Apr 01 '14 at 07:43

Yuvaraja

715
6
22

I don't think that is the problem. Activity Context is passed to teh constructor i guess – Raghunandan Apr 01 '14 at 07:44
Activity does not work too. I am including this in xml as – Binod Singh Apr 01 '14 at 07:47
@binod kindly post more info. the xml in which you have the customview and the packagename for customview any other custructors you have. You provide very little info to solve your problem – Raghunandan Apr 01 '14 at 07:48
@binod edit and post the full code comment is the not the place for adding codes including package name – Raghunandan Apr 01 '14 at 07:49
@Raghunandan Post is edited. Let me know if anything more is needed – Binod Singh Apr 01 '14 at 07:53

Custom View Extending Relative Layout

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