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Read call log and display number EditText
<?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:baselineAligned="true"
android:orientation="horizontal" >

<EditText
    android:id="@+id/edittext"
    android:layout_width="172dp"
    android:layout_height="wrap_content"
    android:layout_weight="0.29"
    android:hint="CONTACT NUMBER" >

    <requestFocus />
</EditText>

<Button
    android:id="@+id/btn"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="CALL LOG" />

</LinearLayout>

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class CallLogRetrieveActivity extends Activity {

Button myCallLogBtn;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    myCallLogBtn=(Button)findViewById(R.id.btn);

    myCallLogBtn.setOnClickListener(new Button.OnClickListener(){

        public void onClick(View v) {

            Intent myIntent=new Intent();
            myIntent.setAction(Intent.ACTION_CALL_BUTTON);
            startActivity(myIntent);

        }});
}
}