In layout file, add android:inputType="number" to EditText to limit the user input to number only.
<LinearLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.androidstringformat.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:autoLink="web"
android:text="http://android-er.blogspot.com/"
android:textStyle="bold" />
<EditText
android:id="@+id/edit1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />
<Button
android:id="@+id/buttonprint"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=" - Print - " />
<TextView
android:id="@+id/printout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
MainActivity.java
package com.example.androidstringformat;
import java.util.Locale;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.os.Bundle;
public class MainActivity extends ActionBarActivity {
EditText edit1;
TextView textOut;
Button buttonPrint;
Spinner spAvailableLocale;
Locale[] availableLocales;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edit1 = (EditText)findViewById(R.id.edit1);
textOut = (TextView)findViewById(R.id.printout);
buttonPrint = (Button)findViewById(R.id.buttonprint);
buttonPrint.setOnClickListener(onClickListener);
}
OnClickListener onClickListener =
new OnClickListener(){
@Override
public void onClick(View arg0) {
String strIn = edit1.getText().toString();
if(!strIn.equals("")){
//convert String to integer
int inInt = Integer.parseInt(strIn);
textOut.setText(
String.format("parse to Integer\n(Decimal): %d\n", inInt) +
String.format("(Octal): %o\n", inInt) +
String.format("(hexadecimal): %x\n(HEXADECIMAL): %X\n", inInt, inInt));
}
}};
}
Next: Accept negative number in EditText