Android uses button buttons to change font size, font color, background color code

Implementation logic: By traversing the view, determine if the view is TextView, edittext, and button type, and if so, modify it.

The code is as follows:
1, XML layout file, FileName: Test4.xml, the contents are as follows:

The code is as follows

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


<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"


Android:layout_width= "Fill_parent"


android:layout_height= "Fill_parent"


android:orientation= "Vertical"


Android:id= "@+id/mainlayout" >








<linearlayout android:layout_width= "Fill_parent"


android:layout_height= "Wrap_content"


android:orientation= "Horizontal" >





<edittext android:id= "@+id/fontsize"


Android:layout_width= "Wrap_content"


android:layout_height= "Wrap_content"


android:text= "30"


Android:hint= "Please enter a number"/>





<button android:id= "@+id/changesize"


Android:layout_width= "Wrap_content"


android:layout_height= "Wrap_content"


android:text= "Change Font"/>





</LinearLayout>





<linearlayout android:layout_width= "Fill_parent"


android:layout_height= "Wrap_content"


android:orientation= "Horizontal" >





<edittext android:id= "@+id/fontcolor"


Android:layout_width= "Wrap_content"


android:layout_height= "Wrap_content"


android:text= "#ffffff"


android:hint= "Please enter font color"/>





<button android:id= "@+id/changecolor"


Android:layout_width= "Wrap_content"


android:layout_height= "Wrap_content"


android:text= "Change font Color"/>





</LinearLayout>








<linearlayout android:layout_width= "Fill_parent"


android:layout_height= "Wrap_content"


android:orientation= "Horizontal" >





<edittext android:id= "@+id/bgcolor"


Android:layout_width= "Wrap_content"


android:layout_height= "Wrap_content"


android:text= "#ff0000"


Android:hint= "Please enter background color"/>





<button android:id= "@+id/changebgcolor"


Android:layout_width= "Wrap_content"


android:layout_height= "Wrap_content"


android:text= "Change the background color"/>





</LinearLayout>





<linearlayout android:layout_width= "Fill_parent"


android:layout_height= "Wrap_content"


android:orientation= "Vertical" >








<textview android:id= "@+id/textview01"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Top"


android:gravity= "Top"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview02"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Bottom"


android:gravity= "Bottom"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview03"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


Android:text= "left"


Android:gravity= "left"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview04"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


Android:text= "Right"


Android:gravity= "Right"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview05"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Center_vertical"


Android:gravity= "Center_vertical"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview06"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Fill_vertical"


Android:gravity= "Fill_vertical"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview07"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Center_horizontal"


Android:gravity= "Center_horizontal"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview08"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Fill_horizontal"


Android:gravity= "Fill_horizontal"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview09"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Center"


android:gravity= "Center"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview10"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Fill"


android:gravity= "Fill"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview11"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Clip_vertical"


Android:gravity= "Clip_vertical"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>





<textview android:id= "@+id/textview12"


Android:layout_width= "Fill_parent"


android:layout_height= "50DP"


android:text= "Clip_horizontal"


Android:gravity= "Clip_horizontal"


Android:textcolor= "#ffffff"


Android:background= "#00ff00"


android:layout_margin= "2px"/>


</LinearLayout>


</LinearLayout>

2, the implementation of the code file: Mainactivity.java, the code is as follows:

The code is as follows

Package org.shuxiang.test;





Import android.app.Activity;


Import Android.graphics.Color;


Import Android.os.Bundle;


Import Android.util.Log;


Import Android.view.View;


Import Android.view.View.OnClickListener;


Import Android.view.ViewGroup;


Import Android.view.Window;


Import Android.widget.Button;


Import Android.widget.EditText;


Import Android.widget.LinearLayout;


Import Android.widget.TextView;


public class Mainactivity extends activity{





Private LinearLayout mainlayout;


Private Button changesize, ChangeColor, Changebgcolor;


Private EditText fontsize, FontColor, bgcolor;





@Override


public void OnCreate (Bundle savedinstancestate) {


Super.oncreate (savedinstancestate);


Requestwindowfeature (Window.feature_no_title);


Setcontentview (R.LAYOUT.TEST4);





Mainlayout = (linearlayout) Findviewbyid (r.id.mainlayout);


Changesize = (Button) Findviewbyid (r.id.changesize);


FontSize = (edittext) Findviewbyid (r.id.fontsize);





Changesize.setonclicklistener (New Onclicklistener ()


{


@Override


public void OnClick (View v)


{


TODO auto-generated Method Stub


Setfontsize (Mainlayout, Float.parsefloat (Fontsize.gettext (). toString ()));


}


});





ChangeColor = (Button) Findviewbyid (R.id.changecolor);


FontColor = (edittext) Findviewbyid (R.id.fontcolor);





Changecolor.setonclicklistener (New Onclicklistener ()


{


@Override


public void OnClick (View v)


{


TODO auto-generated Method Stub


int color = Integer.parseint (Fontcolor.gettext (). toString (). Replace ("#", ""), 16);


int red = (color & 0xff0000) >> 16;


int green = (color & 0x00ff00) >> 8;


int blue = (color & 0x0000ff);





Setfontcolor (Mainlayout, Color.rgb (red, green, blue));


}


});





Changebgcolor = (Button) Findviewbyid (R.id.changebgcolor);


bgcolor = (edittext) Findviewbyid (R.id.bgcolor);





Changebgcolor.setonclicklistener (New Onclicklistener ()


{


@Override


public void OnClick (View v)


{


TODO auto-generated Method Stub


int color = Integer.parseint (Bgcolor.gettext (). toString (). Replace ("#", ""), 16);


int red = (color & 0xff0000) >> 16;


int green = (color & 0x00ff00) >> 8;


int blue = (color & 0x0000ff);





Setbgcolor (Mainlayout, Color.rgb (red, green, blue));


}


});








}





/**


* Change Font


* @param v


* @param fontsize


*/


public void Setfontsize (View V, float fontsizevalue)


{


if (v instanceof TextView)


{


((TextView) v). Settextsize (Fontsizevalue);


}


else if (v instanceof edittext)


{


((EditText) v). Settextsize (Fontsizevalue);


}


else if (v instanceof Button)


{


((Button) v). Settextsize (Fontsizevalue);


}


Else


{


int vchildcount = ((viewgroup) v). Getchildcount ();


for (int i=0; i<vchildcount; i++)


{


View V1 = ((viewgroup) v). Getchildat (i);


Setfontsize (v1, fontsizevalue);


}


}


}





/**


* Change Font Color


* @param v


* @param fontsize


*/


public void Setfontcolor (View v, int fontcolorvalue)


{


if (v instanceof TextView)


{


((TextView) v). SetTextColor (Fontcolorvalue);


}


else if (v instanceof edittext)


{


((EditText) v). SetTextColor (Fontcolorvalue);


}


else if (v instanceof Button)


{


((Button) v). SetTextColor (Fontcolorvalue);


}


Else


{


int vchildcount = ((viewgroup) v). Getchildcount ();


for (int i=0; i<vchildcount; i++)


{


View V1 = ((viewgroup) v). Getchildat (i);


Setfontcolor (v1, fontcolorvalue);


}


}


}





/**


* Change Background font


* @param v


* @param fontsize


*/


public void Setbgcolor (View v, int bgcolorvalue)


{


if (v instanceof TextView)


{


((TextView) v). SetBackgroundColor (Bgcolorvalue);


}


else if (v instanceof edittext)


{


((EditText) v). SetBackgroundColor (Bgcolorvalue);


}


else if (v instanceof Button)


{


((Button) v). SetBackgroundColor (Bgcolorvalue);


}


Else


{


int vchildcount = ((viewgroup) v). Getchildcount ();


for (int i=0; i<vchildcount; i++)


{


View V1 = ((viewgroup) v). Getchildat (i);


Setbgcolor (v1, bgcolorvalue);


}


}


}





}