Custom Toast Demo

Demo:

1) MainActivity.java: 

package com.venky.customtoastdemo; 

import android.app.Activity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

       Button btn;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

             super.onCreate(savedInstanceState);

             setContentView(R.layout.activity_main);

             btn = (Button) findViewById(R.id.button1);

             btn.setOnClickListener(new OnClickListener() {

                    @Override

                    public void onClick(View v) {

                           Toast toast = new Toast(MainActivity.this);

                           View view = getLayoutInflater().from(MainActivity.this)

                                        .inflate(R.layout.style, null);

                           toast.setGravity(Gravity.BOTTOM, 5, 5);

                           toast.setDuration(Toast.LENGTH_LONG);

                           toast.setView(view);

                           toast.show();

                    }

             });

       }

}

2) activity_main.xml: 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/LinearLayout1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#5F04B4"

    android:orientation="vertical" >

    <Button

        android:id="@+id/button1"

        android:layout_width="150dp"

        android:layout_height="40dp"

        android:layout_gravity="center"

        android:layout_marginTop="50dp"

        android:background="#ffffff"

        android:text="Show Toast"

        android:textColor="#000000"

        android:textSize="17dp" />

</LinearLayout>

3) style xml for Toast:  
<?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:background="#ffffff"

    android:orientation="vertical" >

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

        <ImageView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

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

        <TextView

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_gravity="center_vertical"

            android:text="This is Custom Toast message  "

            android:textColor="#5F04B4"

            android:textSize="17dp"

            android:textStyle="bold" />

    </LinearLayout>

</LinearLayout>

4) Download this Project Click Here

Back Button Coding Demo

Demo:

1) MainActivity.java: 

package com.venky.backbuttondemo;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.os.Bundle;

public class MainActivity extends Activity {

       @Override

       protected void onCreate(Bundle savedInstanceState) {

             super.onCreate(savedInstanceState);

             setContentView(R.layout.activity_main);

       }

       @Override

       public void onBackPressed() {

             displayDialog();

       }

       public void displayDialog() {

             AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);

             alert.setMessage("Are you sure to leave this App");

             alert.setNegativeButton("Cancel",

                           new DialogInterface.OnClickListener() {

                                 @Override

                                 public void onClick(DialogInterface dialog, int pos) {

                                        dialog.cancel();

                                 }

                           });

             alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                    @Override

                    public void onClick(DialogInterface dialog, int pos) {

                           finish();

                    }

             });

             alert.show();

       }

}

2) activity_main.xml: 

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

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/LinearLayout1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#5F04B4"

    android:orientation="vertical" >

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="50dp"

        android:gravity="center"

        android:text="Back Button Behavior Chenged"

        android:textColor="#ffffff"

        android:textSize="18dp"

        android:textStyle="bold" />

</LinearLayout>

3) Download this Project Click Here

Auto Scroll Text Demo

Demo:

1) MainActivity.java:

package com.venky.autoscrolltextviewdemo;

import android.app.Activity;

import android.os.Bundle;

public class MainActivity extends Activity {

       @Override

       protected void onCreate(Bundle savedInstanceState) {

             super.onCreate(savedInstanceState);

             setContentView(R.layout.activity_main);

       }

}

2) activity_main.xml:

<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:background="#5F04B4"

    android:orientation="vertical" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="50dp"

        android:ellipsize="marquee"

        android:focusable="true"

        android:focusableInTouchMode="true"

        android:marqueeRepeatLimit="marquee_forever"

        android:scrollHorizontally="true"

        android:text="Welcome to Horizontal Auto Scroll TextView,It is auto scrolling horizontally..."

        android:textColor="#ffffff"

        android:textSize="15dp"

        android:textStyle="bold" />

</LinearLayout>

3) Download this Project Click Here

Read Device Contacts Demo ( Content Provider Demo ) ( Acess another DB )

Demo: 
Devices => 2.3 & 4.2

1) MainActivity.java:

package com.venky.readdevicecontactsdemo;

import java.util.ArrayList; 

import android.app.Activity;

import android.content.ContentResolver;

import android.database.Cursor;

import android.os.Bundle;

import android.provider.ContactsContract;

import android.widget.ArrayAdapter;

import android.widget.ListView;

public class MainActivity extends Activity {

       ListView listView = null;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

             super.onCreate(savedInstanceState);

             setContentView(R.layout.activity_main);

             listView = (ListView) findViewById(R.id.listView);

             ArrayList<String> contacts = new ArrayList<String>();

             ArrayAdapter<String> myAdapter = new ArrayAdapter<String>(this,

                           android.R.layout.simple_list_item_1, contacts);

             listView.setAdapter(myAdapter);

             ContentResolver con = getContentResolver();

             Cursor c = con.query(ContactsContract.Contacts.CONTENT_URI, null, null,

                           null, null);

             if (c.getCount() > 0) {

                    while (c.moveToNext()) {

                           String id = c.getString(c

                                        .getColumnIndex(ContactsContract.Contacts._ID));

                           String name = c

                            .getString(c

                            .getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));

                           String phoneNumber = null;

                           ArrayList<String> phArray = new ArrayList<String>();

                           int hasPhone = c

                            .getInt(c

                      .getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));

                           if (hasPhone == 1) {

                                 Cursor phCursor = con.query(

                  ContactsContract.CommonDataKinds.Phone.CONTENT_URI,

                  null,

                  ContactsContract.CommonDataKinds.Phone.CONTACT_ID

                  + "=" + id, null, null);

                                 while (phCursor.moveToNext()) {

                                        phoneNumber = phCursor

                                          .getString(phCursor

                   .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

                                        phArray.add(phoneNumber);

                                 }

                                 phCursor.close();

                           }

                           contacts.add(id + ". " + name + "\n" + phArray);

                    }

             }

       }

}

2) activity_main.xml:

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

    xmlns:tools="http://schemas.android.com/tools"

    xmlns:android1="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <ListView

        android1:id="@+id/listView"

        android1:layout_width="match_parent"

        android1:layout_height="wrap_content" />

</LinearLayout>

3) Add this Permission into your manifest.xml:

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

4) Download this Project Click Here