ANDROID04-UI01 Common Controls

1. Use of common controls:

Textviewbuttonedittextimageview1.TextView

<textview            android:id= "@+id/text_view"            android:layout_width= "match_parent"            android:layout_height = "Wrap_content"            android:text= "This is TextView"/>

ANDROID:LAYOUT_WIDTH Specifies the width of the control

Android:layout_height Specifies the height of the control

All controls in Android have these two properties, with selectable values of three match_parent, Fill_parent, and wrap_content (size consistent with content)

android:gravity= "Center" text alignment

Android:textsize= "24SP" Font size

Android:textcolor= "#00ff00" Font Color

2.Button

<button            android:id= "@+id/button"            android:layout_width= "match_parent"            android:layout_height= " Wrap_content "            android:text=" button "/>

Register Listener

1.//Anonymous class methods
Button = (button) Findviewbyid (R.id.button); Button.setonclicklistener (New Onclicklistener () {                @Override public                void OnClick (View v) {//Add logic here}});
2.//Implementation Interface Onclicklistener

public class Mainactivity extends Activity implements Onclicklistener {

        Private button button;

        @Override        protected void onCreate (Bundle savedinstancestate) {

        Setcontentview (R.layout.activity_main);

        Button.setonclicklistener (this);}

        @Override public        void OnClick (View v) {

            Switch (V.getid ()) {case            r.id.button://adds logic here

                break;            Default

Break }

}

}

　　

3.EditText

Controls that allow you to enter and edit content in a control

<edittext            android:id= "@+id/edit_text"            android:layout_width= "match_parent"            android:layout_ height= "Wrap_content"
Suggestive text

            android:hint= "Type something Here"/>

            />

The Android:maxlines property can specify the maximum number of rows to display

Get input from EditText

Gets the EditText object that calls the EditText object's GetText (). ToString () method ImageView Controls for displaying pictures android:src property specifies a picture resource

<imageview            android:id= "@+id/image_view"            android:layout_width= "wrap_content"            android:layout_ height= "Wrap_content"            android:src= "@drawable/ic_launcher"            />

Dynamically change the picture in ImageView by code

Imageview.setimageresource (R.drawable.jelly_bean);

ProgressBar

ProgressBar is used to display a progress bar on the interface, indicating that our program is loading some data.

　　

ANDROID04-UI01 Common Controls