Android Concept: 2014

Tuesday, September 2, 2014

WebView Background Color (Transparent)

WebView webViewData = (WebView) findViewById(R.id.webView1);

webView1.setBackgroundColor(0x00000000);

WebView With HTML Script Demo

Ø Create MainActivity.java class in src/package.

MainActivity.java

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.ProgressDialog;

import android.os.Bundle;

import android.webkit.WebView;

import android.webkit.WebViewClient;

public class MainActivity extends Activity {

private WebView webView1;

private ProgressDialog pd;

@SuppressLint("SetJavaScriptEnabled")

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

pd = ProgressDialog.show(this, "", "Loading...", true);

webView1 = (WebView) findViewById(R.id.webView1);

webView1.getSettings().setJavaScriptEnabled(true);

webView1.getSettings().setSupportZoom(true);

webView1.getSettings().setBuiltInZoomControls(true);

webView1.setWebViewClient(new WebViewClient() {

@Override

public void onPageFinished(WebView view, String url) {

if (pd.isShowing() && pd != null) {

pd.dismiss();

}

});

webView1.loadUrl("file:///android_asset/test.html");

}

Ø Create main.xml in res/layout.

main.xml

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

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<WebView

android:id="@+id/webView1"

android:layout_width="match_parent"

android:layout_height="match_parent" />

</LinearLayout>

Ø Create test.html in assets.

test.html

<head>

<title>Internal Script</title>

</head>

<body>

document.write("Hello Javascript!")

</script>

</body>

WebView With Loading Demo (WebViewClient)

Ø Create MainActivity.java class in src/package.

MainActivity.java

import android.annotation.SuppressLint;

import android.app.Activity;

import android.app.ProgressDialog;

import android.os.Bundle;

import android.webkit.WebView;

import android.webkit.WebViewClient;

public class MainActivity extends Activity {

private WebView webView1;

private ProgressDialog pd;

@SuppressLint("SetJavaScriptEnabled")

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

pd = ProgressDialog.show(this, "", "Loading...", true);

webView1 = (WebView) findViewById(R.id.webView1);

webView1.getSettings().setJavaScriptEnabled(true);

webView1.getSettings().setSupportZoom(true);

webView1.getSettings().setBuiltInZoomControls(true);

webView1.setWebViewClient(new WebViewClient() {

@Override

public void onPageFinished(WebView view, String url) {

if (pd.isShowing() && pd != null) {

pd.dismiss();

}

});

webView1.loadUrl("https://www.google.co.in/");

}

Ø Create main.xml in res/layout.

main.xml

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

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<WebView

android:id="@+id/webView1"

android:layout_width="match_parent"

android:layout_height="match_parent" />

</LinearLayout>

Ø Add Permission in AndroidManifest.xml.

<uses-permission android:name="android.permission.INTERNET" />

WebView Demo

Ø Create MainActivity.java class in src/package.

MainActivity.java

import android.app.Activity;

import android.os.Bundle;

import android.webkit.WebView;

public class MainActivity extends Activity {

private WebView webView1;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

webView1 = (WebView) findViewById(R.id.webView1);

webView1.loadUrl("https://www.google.co.in/");

}

Ø Create main.xml in res/layout.

main.xml

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

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

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<WebView

android:id="@+id/webView1"

android:layout_width="match_parent"

android:layout_height="match_parent" />

</LinearLayout>

Ø Add Permission in AndroidManifest.xml.

<uses-permission android:name="android.permission.INTERNET" />

Thursday, August 28, 2014

SharedPreferences

SessionManagement.java

import java.util.HashMap;

import android.annotation.SuppressLint;

import android.content.Context;

import android.content.Intent;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

public class SessionManagement {

SharedPreferences pref;

Editor editor;

Context _context;

int PRIVATE_MODE = 0;

private static final String PREF_NAME = "SharedPreferences_Name";

private static final String IS_LOGIN = "IsLoggedIn";

public static final String KEY_UserName = "UserName";

public static final String KEY_Password = "Password";

@SuppressLint("CommitPrefEdits")

public SessionManagement(Context context) {

this._context = context;

pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);

editor = pref.edit();

}

/**

* Create login session

* */

public void createLoginSession(String UserName, String Password) {

editor.putBoolean(IS_LOGIN, true);

editor.putString(KEY_UserName, UserName);

editor.putString(KEY_Password, Password);

editor.commit();

}

public void checkLogin() {

if (!this.isLoggedIn()) {

Intent i = new Intent(_context, MainActivity.class);

i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

_context.startActivity(i);

}

public HashMap<String, String> getUserDetails() {

HashMap<String, String> user = new HashMap<String, String>();

user.put(KEY_UserName, pref.getString(KEY_UserName, null));

user.put(KEY_Password, pref.getString(KEY_Password, null));

return user;

}

public void logoutUser() {

editor.clear();

editor.commit();

Intent intent;

intent = new Intent(_context, MainActivity.class);

intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

_context.startActivity(intent);

}

public boolean isLoggedIn() {

return pref.getBoolean(IS_LOGIN, false);

}

MainActivity.java

import java.util.HashMap;

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.TextView;

public class MainActivity extends Activity {

private TextView txtMsg;

private EditText edtName, edtPassword;

private Button BtnLogin, BtnLogout;

public SessionManagement session;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

session = new SessionManagement(getApplicationContext());

txtMsg = (TextView) findViewById(R.id.txtMsg);

edtName = (EditText) findViewById(R.id.edtName);

edtPassword = (EditText) findViewById(R.id.edtPassword);

BtnLogin = (Button) findViewById(R.id.BtnLogin);

BtnLogout = (Button) findViewById(R.id.BtnLogout);

BtnLogin.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

session.createLoginSession(edtName.getText().toString(),

edtName.getText().toString());

BtnLogout.setVisibility(View.VISIBLE);

BtnLogin.setVisibility(View.GONE);

edtName.setVisibility(View.GONE);

edtPassword.setVisibility(View.GONE);

session.checkLogin();

// get user data from session

HashMap<String, String> user = session.getUserDetails();

txtMsg.setText(user.get(SessionManagement.KEY_UserName));

}

});

BtnLogout.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

session.logoutUser();

}

});

}

main.xml

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

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

android:layout_width="match_parent"

android:layout_height="wrap_content" >

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="vertical"

android:padding="1.5dp" >

<TextView

android:id="@+id/txtMsg"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center_horizontal"

android:padding="3dp"

android:text="@string/Hello"

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

<EditText

android:id="@+id/edtName"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="1.5dp"

android:ems="10"

android:hint="@string/Name" >

</EditText>

<EditText

android:id="@+id/edtPassword"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="1.5dp"

android:ems="10"

android:hint="@string/Password"

android:inputType="textPassword" />

<Button

android:id="@+id/BtnLogin"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="1.5dp"

android:text="@string/Login" />

<Button

android:id="@+id/BtnLogout"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="1.5dp"

android:text="@string/Logout"

android:visibility="gone" />

</LinearLayout>

</ScrollView>

strings.xml

<string name="app_name">SharedPreferences</string>

<string name="Logout">Logout</string>

<string name="Login">Login</string>

<string name="Hello">Hello</string>

<string name="Password">Password</string>

</resources>