Android Progress Dialog

In this exercise we will learn to create a Progress Dialog.

Lets create a button to trigger the progress dialog.

<Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:text="Start" />

Now to trigger the progress dialog

import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity
{
Button st;
ProgressDialog dialog;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
st=(Button)findViewById(R.id.button1);
st.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
dialog=ProgressDialog.show(MainActivity.this,"Progress Dialog","Loading...",true);
Thread t=new Thread()
{
public void run()
{
try
{
Thread.sleep(5000);
dialog.cancel();
}
catch(Exception e)
{
Toast.makeText(MainActivity.this,""+e,Toast.LENGTH_LONG).show();
}
}
};
t.start();
}
});
}
}

The program has been coded to show the progress dialog for 5 seconds.

Radio Button Alert Box

In this post, we will create a Alert Box with radio Buttons.

Lets create a button which will trigger the alert box.

<Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="Click Me" />

After creating the button, make changes in the java file.

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

public class MainActivity extends Activity
{
Button b;
final CharSequence[] items={"Red","Green","Blue"};
AlertDialog.Builder builder;
AlertDialog alert;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b=(Button)findViewById(R.id.button1);
builder=new AlertDialog.Builder(this);
builder.setTitle("Pick a Color");
builder.setSingleChoiceItems(items,-1,new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,"Color : "+items[which],Toast.LENGTH_LONG).show();
}
});
alert=builder.create();
b.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
alert.show();
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

Output should look like

Button Alert Box

Now lets start with the Button Alert Box.

To start create a button on whose click the alert box would appear.

<Button

            android:id="@+id/button1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerHorizontal="true"

            android:layout_centerVertical="true"

            android:text="Click Me...!!!"  />

Now to make the alert box appear on click of the button and illustrate working of Button Alert Box.

public class MainActivity extends Activity
{
Button b;
AlertDialog alert;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b=(Button)findViewById(R.id.button1);
final CharSequence[] items={"Red","Green","Blue"};
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Pick a Colour.");
builder.setItems(items, new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
//TODO Auto-generated method stub
Toast.makeText(MainActivity.this,""+items[which],Toast.LENGTH_SHORT).show();
}
});
alert=builder.create();
b.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
//TODO Auto-generated method stub
alert.show();
}
});
}
}

Now the output should look like this