Shape and selector for Android rounded corners

Shape and Selector are frequently used in Android UI design. For example, if we want to customize a rounded corner button and click the button to change some effects, we need to use shape and selector. It can be said that shape and Selector play a vital role in beautifying controls.

1. Shape

Introduction

Role: geometric shapes defined in XML

Location: Res/drawable/file name. xml

Usage:

In Java code: R. drawable. File Name

In XML: Android: Background = "@ drawable/file name"

Attribute:

<Shape> Android: Shape = ["rectangle" | "Oval" | "line" | "ring"] The rectagle rectangle, oval elliptic, line horizontal line, ring <shape> common attributes of neutron nodes: <gradient> gradient Android: startcolor starting color Android: endcolor ending color Android: angle gradient angle, 0 from top to bottom, 90 indicates that the value is from left to right, And the integer multiple of the value is 45 by default. Android: Type gradient style liner linear gradient Radial Ring gradient sweep <solid> fills Android: color fill color <stroke> stroke Android: width stroke width Android: Color stroke color Android: dashwidth represents the width of the '-' horizontal line Android: dashgap indicates the distance between '-' and <corners> rounded corner Android: radius rounded corner. The larger the radius is, the greater the angle is. Android: toprightradius: upper right corner radius Android: bottomleftradius: lower right corner radius Android: topleftradius top left corner radius Android: bottomrightradius bottom left corner radius

2. Selector

 Introduction

Location: Res/drawable/file name. xml

Usage:

In Java code: R. drawable. File Name

In XML: Android: Background = "@ drawable/file name"

Selector. xml

<?xml version="1.0" encoding="utf-8"?>     <selector xmlns:android="http://schemas.android.com/apk/res/android">              <item android:state_selected="true">             <shape>                 <gradient android:angle="270" android:endColor="#99BD4C"                     android:startColor="#A5D245" />                 <size android:height="60dp" android:width="320dp" />                 <corners android:radius="8dp" />             </shape>         </item>         <item android:state_pressed="true">             <shape>                 <gradient android:angle="270" android:endColor="#99BD4C"                     android:startColor="#A5D245"/>                 <size android:height="60dp" android:width="320dp" />                 <corners android:radius="8dp" />             </shape>         </item>         <item>             <shape>                 <gradient android:angle="270" android:endColor="#A8C3B0"                     android:startColor="#C6CFCE"/>                 <size android:height="60dp" android:width="320dp" />                 <corners android:radius="8dp" />             </shape>         </item>     </selector>

List_item.xml

<?xml version="1.0" encoding="utf-8"?>        <LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"         android:orientation="horizontal"           android:layout_width="fill_parent"            android:layout_height="wrap_content"         android:background="@drawable/selector"         >                             <ImageView               android:id="@+id/img"                android:layout_width="wrap_content"               android:layout_height="wrap_content"                          android:layout_gravity="center_vertical"             android:layout_marginLeft="20dp"                      />                                        <TextView                   android:text="data"                   android:id="@+id/title"                 android:layout_width="fill_parent"                   android:layout_height="wrap_content"                   android:gravity="center_vertical"                    android:layout_marginLeft="20dp"                   android:layout_marginTop="20dp"                   android:textSize="14sp"                                           android:textStyle="bold"                 android:textColor="@color/black"                                          >             </TextView>                </LinearLayout>

Main. xml

<?xml version="1.0" encoding="utf-8"?>         <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"             android:orientation="vertical"               android:layout_width="fill_parent"                android:layout_height="wrap_content"             android:background="#253853"             >                                             <ListView                 android:id="@+id/list"                 android:layout_width="match_parent"                 android:layout_height="match_parent"               android:cacheColorHint="#00000000"               android:divider="#2A4562"               android:dividerHeight="3px"               android:listSelector="#264365"               android:drawSelectorOnTop="false"                >             </ListView>       </LinearLayout>

Colors. xml

<?xml version="1.0" encoding="utf-8"?>     <resources>         <color name="white">#FFFFFFFF</color>         <color name="transparency">#00000000</color>         <color name="title_bg">#1C86EE</color>         <color name="end_color">#A0cfef83</color>         <color name="black">#464646</color>     </resources>

Mainactivity

package com.lingdududu.customlist;           import java.util.ArrayList;      import java.util.HashMap;           import xb.customlist.R;           import android.R.array;      import android.app.Activity;      import android.os.Bundle;      import android.widget.ArrayAdapter;      import android.widget.ListView;      import android.widget.SimpleAdapter;           public class MainActivity extends Activity {          ListView list;                    String data[] = new String[]{                  "China","UK","USA","Japan","German","Canada","ET","Narotu"            };                                     @Override         public void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.main);                                          list =(ListView) findViewById(R.id.list);                                    SimpleAdapter adapter = new SimpleAdapter(this, getData(), R.layout.list_item,                       new String[]{"title","img"}, new int[]{R.id.title,R.id.img});                            list.setAdapter(adapter);                  }                    private ArrayList<HashMap<String, Object>> getData() {                    ArrayList<HashMap<String, Object>> dlist = new ArrayList<HashMap<String,Object>>();                            for(int i =0;i<data.length;i++){                  HashMap<String, Object>map = new HashMap<String, Object>();                           map.put("title", data[i]);                  map.put("img", R.drawable.item_left2);                  dlist.add(map);               }              return dlist;          }      }

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