Dynamic Creation of multiple buttons for Android Development

// Obtain the screen size to properly set the button size and position

DisplayMetrics dm = new DisplayMetrics ();

GetWindowManager (). getDefaultDisplay (). getMetrics (dm );

Int width = dm. widthPixels;

Int height = dm. heightPixels;

// Customize the layout component

RelativeLayout layout = new RelativeLayout (this );

// Create 16 buttons here, with four buttons in each line

Button Btn [] = new Button [16];

Int j =-1;

For (int I = 0; I <= 15; I ++ ){

Btn [I] = new Button (this );

Btn [I]. setId (2000 + I );

Btn [I]. setText ("button" + I );

RelativeLayout. LayoutParams btParams = new RelativeLayout. LayoutParams (width-50)/4,40); // set

Set the width and height of the button

If (I % 4 = 0 ){

J ++;

}

BtParams. leftMargin = 10 + (width-50)/4 + 10) * (I % 4); // locate the X coordinate

BtParams. topMargin = 20 + 55 * j; // ordinate position

Layout. addView (Btn [I], btParams); // Add the button to the layout component.

}

This. setContentView (layout );

// Configure listeners in batches

For (int k = 0; k <= Btn. length-1; k ++ ){

// No findId is required here, because the Id corresponding to the button has been determined during creation.

Btn [k]. setTag (k); // set a tag for the button to confirm which button is pressed

Btn [k]. setOnClickListener (new Button. OnClickListener (){

@ Override

Public void onClick (View v ){

Int I = (Integer) v. getTag (); // here I cannot be defined externally. Because of the relationship between internal classes, there are a lot of complicated internal classes.

Something to study

Intent intent = new Intent ();

Intent. setClass (Work_01.this, Work_02.class );

Bundle bundle = new Bundle ();

Bundle. putInt ("count", I );

Intent. putExtras (bundle );

StartActivity (intent );

Work_01.this.finish ();

}

});

}

Then, you can print the "press button:" I in Work_02 to confirm whether the listener is set correctly.

For example, press the button 0. In the corresponding page of Work_02, the "pressed button is 0" should be printed ".