Android 开发笔记___drawable

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical">

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:layout_margin="10dp"
         android:text="默认样式的按钮"
         android:textColor="#000000"
         android:textSize="17sp" />

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_gravity="center"
         android:layout_margin="10dp"
         android:paddingLeft="8dp"
         android:paddingRight="8dp"
         android:background="@drawable/btn_nine_selector"
         android:text="定制样式的按钮"
         android:textColor="#000000"
         android:textSize="17sp" />

 </LinearLayout>

selector

 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_pressed="true" android:drawable="@drawable/button_pressed" />
     <item android:drawable="@drawable/button_normal" />
 </selector>

java

 package com.example.alimjan.hello_world;

 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.Nullable;

 /**
  * Created by alimjan on 7/1/2017.
  */

 public class class__2_4_1_1  extends Activity {
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.code_2_4_1_1);
     }
     public static void startHome(Context mContext) {
         Intent intent = new Intent(mContext, class__2_4_1_1.class);
         mContext.startActivity(intent);
     }
 }

状态类型	说明	常用的控件
state_pressed	是否按下	按钮button
state_checked	是否勾选	单选框RadioButton、复选框chenckBox
state_focused	是否获取焦点	文本编辑框Edittext
state_selected	是否选中	各控件均可