Tuesday, 2 July 2013

Android password field example

// siddhu vydyabhushana // 5 comments
In Android, you can use “android.widget.EditText“, with inputType="textPassword" to render a password component.
In this tutorial, we show you how to use XML to create a password field, label field and a normal button. When you click on the button, the password value will be displayed as a floating message (toast message).
P.S This project is developed in Eclipse 3.7, and tested with Android 2.3.3.

1. Custom String

Open “res/values/strings.xml” file, add some custom string for demonstration.
File : res/values/strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="app_name">MyAndroidApp</string>
    <string name="lblPassword">Enter Your Password :</string>
    <string name="btn_submit">Submit</string>
</resources>

2. Password

Open “res/layout/main.xml” file, add a password component, EditText + inputType="textPassword".
File : res/layout/main.xml
<?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:orientation="vertical" >
 
    <TextView
        android:id="@+id/lblPassword"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/lblPassword"
        android:textAppearance="?android:attr/textAppearanceLarge" />
 
    <EditText
        android:id="@+id/txtPassword"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword" >
 
        <requestFocus />
    </EditText>
 
    <Button
        android:id="@+id/btnSubmit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/btn_submit" />
 
</LinearLayout>

3. Code Code

Inside activity “onCreate()” method, attach a click listener on button, to display the password value.
File : MyAndroidAppActivity.java
package com.mkyong.android;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
 
public class MyAndroidAppActivity extends Activity {
 
  private EditText password;
  private Button btnSubmit;
 
  @Override
  public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
 
	addListenerOnButton();
 
  }
 
  public void addListenerOnButton() {
 
	password = (EditText) findViewById(R.id.txtPassword);	
	btnSubmit = (Button) findViewById(R.id.btnSubmit);
 
	btnSubmit.setOnClickListener(new OnClickListener() {
 
		@Override
		public void onClick(View v) {
 
		  Toast.makeText(MyAndroidAppActivity.this, password.getText(),
			Toast.LENGTH_SHORT).show();
 
		}
 
	});
 
  }
}

4. Demo

Run the application.
1. Result, password field is displayed.
android password demo1
2. Type password “mkyong123″ and click on the submit button.
android password demo2

Download Source Code

Download it – Android-Password-Example.zip (15 KB)

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