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