Android Code Example: Android Login

--> Android Login with Share Preference

Preferences Framework

Android provides a standardized framework for setting preferences across all applications. The framework uses category preferences and screens to group related settings. PreferenceCategory is used to declare a set of preferences into one category. PreferenceScreen presents a group of preferences in a new screen.

Android Login Example Code

LoginActivity.java Code

package android.code.login;

import android.app.Activity;

import android.content.Intent;

import android.content.SharedPreferences;

import android.os.Bundle;

import android.preference.PreferenceManager;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class LoginActivity extends Activity {

SharedPreferences myprefs;

EditText userET, passwordET;

Button loginBT;

static String username;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

//setContentView(R.layout.main);

myprefs = PreferenceManager.getDefaultSharedPreferences(this);

username = myprefs.getString("username", null);

final String password = myprefs.getString("password", null);

if (username != null && password != null){

setContentView(R.layout.main);

userET = (EditText)findViewById(R.id.editTextUser);

passwordET = (EditText)findViewById(R.id.editPassword);

loginBT = (Button)findViewById(R.id.btnLogin);

loginBT.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

try {

if(username.equals(userET.getText().toString())

&& password.equals(

passwordET.getText().toString())) {

Toast.makeText(LoginActivity.this,

"login passed!!",

Toast.LENGTH_SHORT).show();

//user = userET.getText();

startActivity(new Intent("android.code.login.activity2"));

} else {

Toast.makeText(LoginActivity.this,

"login failed!!",

Toast.LENGTH_SHORT).show();

}

} catch (Exception e) {

e.printStackTrace();

}

});

} else {

Intent i = new Intent(this, myPreferences.class);

startActivity(i);

}

Button bn = (Button)findViewById(R.id.button2);

bn.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

//startActivity(new Intent("com.app.activity2")); // Next page

} // onClick(View v)

}); // bn.setOnClickListener

}

myPreferences.java Code

package android.code.login;

import android.os.Bundle;

import android.preference.PreferenceActivity;

public class myPreferences extends PreferenceActivity {

//public static final String KEY_MY_PREFERENCE = "my_preference";

//public static final String KEY_ADVANCED_CHECKBOX_PREFERENCE = "advanced_checkbox_preference";

public static final String USER_NAME = "username";

public static final String PASSWORD = "password";

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

addPreferencesFromResource(R.xml.preferrences);

}

main.xml Code

<?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:background="#4e0b02"

android:orientation="vertical" >

<ScrollView

android:id="@+id/scrollView1"

android:layout_width="fill_parent"

android:layout_height="wrap_content" >

<LinearLayout

android:id="@+id/linearLayout1"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:text="Android Login"

android:textColor="#585ff6"

android:textStyle="bold"

android:textSize="30dp" />

<ImageView

android:id="@+id/imageView2"

android:layout_width="fill_parent"

android:layout_height="66dp"

android:layout_gravity="center_vertical"

android:layout_marginTop="10dp"

android:src="@drawable/ic_launcher" />

<TextView

android:id="@+id/textView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text=" "

android:textAppearance="?android:attr/textAppearanceLarge" />

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Username"

android:textAppearance="?android:attr/textAppearanceMedium" />

<EditText

android:id="@+id/editTextUser"

android:layout_width="fill_parent"

android:layout_height="wrap_content" >

</EditText>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Password"

android:textAppearance="?android:attr/textAppearanceMedium" />

<LinearLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content" >

<EditText

android:id="@+id/editPassword"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="7.61"

android:inputType="textPassword" />

<Button

android:id="@+id/button2"

android:layout_width="80dp"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="Clear" />

<Button

android:id="@+id/btnLogin"

android:layout_width="80dp"

android:layout_height="wrap_content"

android:layout_gravity="right"

android:layout_weight="1"

android:text="Log In" />

</LinearLayout>

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text=" "

android:textAppearance="?android:attr/textAppearanceLarge" />

<ImageView

android:id="@+id/imageView1"

android:layout_width="wrap_content"

android:layout_height="wrap_content" />

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="right"

android:text="Version 0.1 "

android:textColor="#FF00FF"

android:textSize="20dp" />

</LinearLayout>

</ScrollView>

</LinearLayout>

perferences.xml Code

<?xml version="1.0" encoding="utf-8"?>

<EditTextPreference

android:title="User Name"

android:key="username"

android:summary="Please provide Your User Name">

</EditTextPreference>

<EditTextPreference

android:title="Password"

android:key="password"

android:summary="Please enter your password">

</EditTextPreference>

</PreferenceScreen>

AndroidManifest.xml Code

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="android.code.login"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk android:minSdkVersion="10" />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name" >

<activity

android:name=".LoginActivity"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

<activity android:name=".myPreferences"

android:label="@string/app_name">

<intent-filter>

</intent-filter>

</activity>

<activity

android:name="android.code.login.activity2"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

Download Android Login Example Code
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Share Preference

Android Control ควบคุมอุปกรณ์ต่างๆ ด้วย Android

http://androidcontrol.blogspot.com

สอนเขียน Android สอนเขียนโปรแกรม Android

http://androidcontrol.blogspot.com/2012/01/beginning-android-training-android.html

ติดต่อ amphancm@gmail.com

วันพุธที่ 4 กรกฎาคม พ.ศ. 2555

Android Login