TableLayout use in android xml.

The code has been written in two files
a) main.xml
b) tableActivity.java

The code is as follows

a) main.xml


<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TableRow>
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Table Row1 Button1" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Table Row1 Button2" />
    </TableRow>
    <TableRow>
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Table Row2 Button1" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Table Row2 Button2" />
    </TableRow>
    <TableRow>
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Table Row3 Button1" />
        <Button android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Table Row3 Button2" />
    </TableRow>
</TableLayout>


b) tableActivity.java

package org.example.table;

import android.app.Activity;
import android.os.Bundle;

public class tableActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

How to decrease the size of radio buttons in android xml

1. Create radio_button.xml in drawable.


<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/btn_radio_on" android:state_checked="true" android:state_pressed="false"/>
    <item android:drawable="@drawable/btn_radio_off" android:state_checked="false" android:state_pressed="false"/>
    <item android:drawable="@drawable/btn_radio_on_pressed" android:state_checked="true" android:state_pressed="true"/>
    <item android:drawable="@drawable/btn_radio_off_pressed" android:state_checked="false" android:state_pressed="true"/>

</selector>

note: images used in radio_button.xml file.









2. Use radiogroup in any layout.


 <RadioGroup
                        android:id="@+id/radioGroup1"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignBottom="@+id/radioButton3"
                        android:layout_alignParentLeft="true"
                        android:layout_below="@+id/imageView2" >

                        <RadioButton
                            android:id="@+id/radio0"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:checked="true"
                            android:text="Name"
                            android:button="@drawable/radio_button"
                            android:textColor="#000000" />

                        <RadioButton
                            android:id="@+id/radio1"
                            android:layout_width="wrap_content"
                            android:button="@drawable/radio_button"
                            android:layout_height="wrap_content"
                            android:text="Code"
                            android:textColor="#000000" />
                    </RadioGroup>

Android Custom Button Style

1. http://www.mindfreakerstuff.com/2012/09/50-useful-android-custom-button-style-set-1/#shakespeare
2. http://technotzz.wordpress.com/2012/06/19/fancy-gradient-buttons-for-android/

When Landscape view is used then how can change the layout in landscape view?

1. Create new folder in res/layout-land.

2. Make two layout file with same name main.xml

3. Now place one layout file which is for landscape view in res/layout-land/main.xml

Now when you change view of device that can be take layout automatically from the layout.

How to detact Internet connection availibility in android ?

1. Create Layout 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Detect Internet Status" />

    <Button android:id="@+id/btn_check"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="Check Internet Status"
        android:layout_centerInParent="true"/>

</RelativeLayout>

2.Create ConnectionDetector class

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class ConnectionDetector {
     private Context _context;
   
        public ConnectionDetector(Context context){
            this._context = context;
        }
   
        public boolean isConnectingToInternet(){
            ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);
              if (connectivity != null)
              {
                  NetworkInfo[] info = connectivity.getAllNetworkInfo();
                  if (info != null)
                      for (int i = 0; i < info.length; i++)
                          if (info[i].getState() == NetworkInfo.State.CONNECTED)
                          {
                              return true;
                          }
   
              }
              return false;
        }

}

3. now in main activity class write following code.

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.View;
import android.widget.Button;


public class MainActivity extends Activity {

    // flag for Internet connection status
    Boolean isInternetPresent = false;

    // Connection detector class
    ConnectionDetector cd;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
       
        Button btn_check=(Button) findViewById(R.id.btn_check);
       
        // creating connection detector class instance
        cd = new ConnectionDetector(getApplicationContext());
       
        btn_check.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v)
            {

                // get Internet status
                isInternetPresent = cd.isConnectingToInternet();

                // check for Internet status
                if (isInternetPresent)
                {
                    // Internet Connection is Present
                    // make HTTP requests
                    showAlertDialog(MainActivity.this, "Internet Connection","You have internet connection", true);
                }
                else
                {
                    // Internet connection is not present
                    // Ask user to connect to Internet
                    showAlertDialog(MainActivity.this, "No Internet Connection","You don't have internet connection.", false);
                }
            }

        });
    }
  
    public void showAlertDialog(Context context, String title, String message, Boolean status) {
        AlertDialog alertDialog = new AlertDialog.Builder(context).create();

        // Setting Dialog Title
        alertDialog.setTitle(title);

        // Setting Dialog Message
        alertDialog.setMessage(message);

        // Setting alert dialog icon
        //alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);

        // Setting OK Button
        alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }
   
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

How to use SQLiteAssetHelper Library with SQLite Database

Jar file and documentation are available at  https://github.com/jgilfelt/android-sqlite-asset-helper.

It is used to add your database folder in asset folder in your folder hierarchy and use it in your Application. 

1. Add android-sqlite-asset-helper.jar to lib directory.
2. Copy database in a zip file in assets/databases/database_name.zip.
3. Create class:

   public class MyDatabase extends SQLiteAssetHelper {
   
       private static final String DATABASE_NAME = "database_name";
       private static final int DATABASE_VERSION = 1;
   
       public MyDatabase(Context context) {
           super(context, DATABASE_NAME, null, DATABASE_VERSION);  
       }
    }

AVD Configuration

Device	Version	Resolution	RAM	LCD Density	Hardware Back/Home
Nexus
Galaxy Nexus	17 (4.2.1)	720x1280	1024	316	no
Nexus S	16 (4.1.2)	480x800	512	233	yes
Nexus 7	17 (Google APIs)	800x1280	1024	216	no
Nexus 4	17 (Google APIs)	768x1280	2048	320	no
Nexus 10	17 (Google APIs)	2560x1600	2048	300	no
Galaxy
Galaxy S2	15 (4.0.4)	480x800	1024	218	yes
Galaxy S3	16 (4.1.2)	720x1280	1024	306	yes