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"

Answer 1

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

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");    } }