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<!--get from googlesamples -->

<!--Material BorderlessImageButton  -->
<ImageButton android:id="@+id/secondary_action"
        style="?android:borderlessButtonStyle"
        android:layout_width="@dimen/standard_touch_target_size"
        android:layout_height="match_parent"
        android:src="@drawable/ic_action_delete"
        android:contentDescription="@string/delete_content_description" />
		

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<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="line">

    <stroke
       android:color="#C7B299"
       android:dashWidth="10px"
       android:dashGap="10px"
       android:width="1dp"/>
</shape>

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ObjectAnimator 使用的属性介绍:
  
translationX,translationY: View相对于原始位置的偏移量
rotation,rotationX,rotationY: 旋转，rotation用于2D旋转角度，3D中用到后两个
scaleX,scaleY: 缩放比
x,y: View的最终坐标，是View的left，top位置加上translationX，translationY
alpha: 透明度

TimeInterplator:

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package com.example.betterzw.myapplication;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ScrollView;

/**
 * Created by betterzw on 16-1-27.

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Spinner spinner = (Spinner) findViewById(R.id.spinner);
    try {
        Field popup = Spinner.class.getDeclaredField("mPopup");
        popup.setAccessible(true);

        // Get private mPopup member variable and try cast to ListPopupWindow
        android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(spinner);

        // Set popupWindow height to 500px
        popupWindow.setHeight(500);

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final URL location = new URL(FEED_URL);
            InputStream stream = null;

            try {
                Log.i(TAG, "Streaming data from network: " + location);
                stream = downloadUrl(location);
                updateLocalFeedData(stream, syncResult);
                // Makes sure that the InputStream is closed after the app is
                // finished using it.
            } finally {

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一、TextView
    android:autoLink="all" //自动添加超链接
二、代码中添加字体的属性
    SpannableString ss = new SpannableString(
                "text_spannable: Manually created spans. Click here to dial the phone.");
    //加粗
    ss.setSpan(new StyleSpan(Typeface.BOLD), 0, 39,
                Spanned.SPAN_INCLUSIVE_INCLUSIVE);
    //特定的字符添加超链接 

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

    <include layout="@layout/view_feed_toolbar" />

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 <android.support.design.widget.TabLayout
                        android:id="@+id/home_tab_tab"
                        style="@style/customTabLayout"
                        app:tabMode="scrollable" />


<style name="customTabLayout" parent="Widget.Design.TabLayout">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">45dip</item>

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public class ArithUtils {

    /**
     * 提供精确的加法运算。
     *
     * @param v1 被加数
     * @param v2 加数
     * @return 两个参数的和
     */
    public static double add(double v1, double v2) {