轉載請標明出處:http://blog.csdn.net/lmj623565791/article/details/38092093
上一篇Android 屬性動畫(Property Animation) 完全解析 (上)已經基本展示了屬性動畫的核心用法:
ObjectAnimator實現動畫,ValueAnimator實現動畫,AnimatorSet的使用等~
當然了屬性動畫還有一部分的知識點,也能做出很不錯的效果,將在本篇博客爲您展示~
1、如何使用xml文件來創建屬性動畫
大家肯定都清楚,View Animator 、Drawable Animator都可以在anim文件夾下創建動畫,然後在程序中使用,甚至在Theme中設置爲屬性值。當然了,屬性動畫其實也可以在文件中聲明:
首先在res下建立animator文件夾,然後建立res/animator/scalex.xml
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<?xml version="1.0" encoding="utf-8"?>
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<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
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android:duration="1000"
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android:propertyName="scaleX"
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android:valueFrom="1.0"
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android:valueTo="2.0"
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android:valueType="floatType" >
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</objectAnimator>
代碼:
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public void scaleX(View view)
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{
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Animator anim = AnimatorInflater.loadAnimator(this, R.animator.scalex);
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anim.setTarget(mMv);
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anim.start();
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}
使用AnimatorInflater加載動畫的資源文件,然後設置目標,就ok~~是不是很簡單,這只是單純橫向的放大一倍~
如果我希望縱向與橫向同時縮放呢?則可以怎麼定義屬性文件:
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<?xml version="1.0" encoding="utf-8"?>
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<set xmlns:android="http://schemas.android.com/apk/res/android"
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android:ordering="together" >
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<objectAnimator
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android:duration="1000"
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android:propertyName="scaleX"
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android:valueFrom="1"
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android:valueTo="0.5" >
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</objectAnimator>
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<objectAnimator
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android:duration="1000"
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android:propertyName="scaleY"
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android:valueFrom="1"
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android:valueTo="0.5" >
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</objectAnimator>
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</set>
使用set標籤,有一個orderring屬性設置爲together,【還有另一個值:sequentially(表示一個接一個執行)】。
上篇博客中忽略了一個效果,就是縮放、反轉等都有中心點或者軸,默認中心縮放,和中間對稱線爲反轉線,所以我決定這個橫向,縱向縮小以左上角爲中心點:
代碼:
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Animator anim = AnimatorInflater.loadAnimator(this, R.animator.scale);
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mMv.setPivotX(0);
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mMv.setPivotY(0);
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mMv.invalidate();
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anim.setTarget(mMv);
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anim.start();
很簡單,直接給View設置pivotX和pivotY,然後調用一下invalidate,就ok了。
下面看效果圖:
好了,通過寫xml聲明動畫,使用set嵌套set,結合orderring屬性,也基本可以實現任何動畫~~上面也演示了pivot的設置。
2、佈局動畫(Layout Animations)
主要使用LayoutTransition爲佈局的容器設置動畫,當容器中的視圖層次發生變化時存在過渡的動畫效果。
基本代碼爲:
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LayoutTransition transition = new LayoutTransition();
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transition.setAnimator(LayoutTransition.CHANGE_APPEARING,
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transition.getAnimator(LayoutTransition.CHANGE_APPEARING));
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transition.setAnimator(LayoutTransition.APPEARING,
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null);
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transition.setAnimator(LayoutTransition.DISAPPEARING,
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null);
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transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING,
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null);
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mGridLayout.setLayoutTransition(transition);
過渡的類型一共有四種:
LayoutTransition.APPEARING 當一個View在ViewGroup中出現時,對此View設置的動畫
LayoutTransition.CHANGE_APPEARING 當一個View在ViewGroup中出現時,對此View對其他View位置造成影響,對其他View設置的動畫
LayoutTransition.DISAPPEARING 當一個View在ViewGroup中消失時,對此View設置的動畫
LayoutTransition.CHANGE_DISAPPEARING 當一個View在ViewGroup中消失時,對此View對其他View位置造成影響,對其他View設置的動畫
LayoutTransition.CHANGE 不是由於View出現或消失造成對其他View位置造成影響,然後對其他View設置的動畫。
注意動畫到底設置在誰身上,此View還是其他View。
好了下面看一個綜合的例子:
佈局文件:
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:id="@+id/id_container"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:orientation="vertical" >
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<Button
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:onClick="addBtn"
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android:text="addBtns" />
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<CheckBox
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android:id="@+id/id_appear"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:checked="true"
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android:text="APPEARING" />
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<CheckBox
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android:id="@+id/id_change_appear"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:checked="true"
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android:text="CHANGE_APPEARING" />
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<CheckBox
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android:id="@+id/id_disappear"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:checked="true"
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android:text="DISAPPEARING" />
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<CheckBox
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android:id="@+id/id_change_disappear"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:checked="true"
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android:text="CHANGE_DISAPPEARING " />
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</LinearLayout>
代碼:
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package com.example.zhy_property_animation;
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import android.animation.LayoutTransition;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.ViewGroup;
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import android.widget.Button;
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import android.widget.CheckBox;
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import android.widget.CompoundButton;
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import android.widget.CompoundButton.OnCheckedChangeListener;
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import android.widget.GridLayout;
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public class LayoutAnimaActivity extends Activity implements
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OnCheckedChangeListener
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{
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private ViewGroup viewGroup;
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private GridLayout mGridLayout;
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private int mVal;
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private LayoutTransition mTransition;
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private CheckBox mAppear, mChangeAppear, mDisAppear, mChangeDisAppear;
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@Override
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public void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.layout_animator);
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viewGroup = (ViewGroup) findViewById(R.id.id_container);
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mAppear = (CheckBox) findViewById(R.id.id_appear);
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mChangeAppear = (CheckBox) findViewById(R.id.id_change_appear);
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mDisAppear = (CheckBox) findViewById(R.id.id_disappear);
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mChangeDisAppear = (CheckBox) findViewById(R.id.id_change_disappear);
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mAppear.setOnCheckedChangeListener(this);
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mChangeAppear.setOnCheckedChangeListener(this);
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mDisAppear.setOnCheckedChangeListener(this);
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mChangeDisAppear.setOnCheckedChangeListener(this);
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mGridLayout = new GridLayout(this);
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mGridLayout.setColumnCount(5);
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viewGroup.addView(mGridLayout);
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mTransition = new LayoutTransition();
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mGridLayout.setLayoutTransition(mTransition);
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}
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public void addBtn(View view)
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{
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final Button button = new Button(this);
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button.setText((++mVal) + "");
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mGridLayout.addView(button, Math.min(1, mGridLayout.getChildCount()));
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button.setOnClickListener(new OnClickListener()
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{
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@Override
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public void onClick(View v)
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{
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mGridLayout.removeView(button);
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}
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});
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}
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@Override
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public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
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{
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mTransition = new LayoutTransition();
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mTransition.setAnimator(
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LayoutTransition.APPEARING,
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(mAppear.isChecked() ? mTransition
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.getAnimator(LayoutTransition.APPEARING) : null));
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mTransition
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.setAnimator(
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LayoutTransition.CHANGE_APPEARING,
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(mChangeAppear.isChecked() ? mTransition
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.getAnimator(LayoutTransition.CHANGE_APPEARING)
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: null));
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mTransition.setAnimator(
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LayoutTransition.DISAPPEARING,
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(mDisAppear.isChecked() ? mTransition
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.getAnimator(LayoutTransition.DISAPPEARING) : null));
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mTransition.setAnimator(
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LayoutTransition.CHANGE_DISAPPEARING,
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(mChangeDisAppear.isChecked() ? mTransition
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.getAnimator(LayoutTransition.CHANGE_DISAPPEARING)
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: null));
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mGridLayout.setLayoutTransition(mTransition);
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}
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}
效果圖:
動畫有點長,耐心點看,一定要注意,是對當前View還是其他Views設置的動畫。
當然了動畫支持自定義,還支持設置時間,比如我們修改下,添加的動畫爲:
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mTransition.setAnimator(LayoutTransition.APPEARING, (mAppear
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.isChecked() ? ObjectAnimator.ofFloat(this, "scaleX", 0, 1)
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: null));
則效果爲:
原本的淡入,變成了寬度從中間放大的效果~~是不是還不錯~~
3、View的anim方法
在SDK11的時候,給View添加了animate方法,更加方便的實現動畫效果。
佈局文件:
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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>
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<ImageView
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android:id="@+id/id_ball"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:src="@drawable/bol_blue" />
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<LinearLayout
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:layout_alignParentBottom="true"
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android:orientation="horizontal" >
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<Button
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:onClick="viewAnim"
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android:text="View Anim" />
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<Button
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:onClick="propertyValuesHolder"
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android:text="PropertyValuesHolder " />
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</LinearLayout>
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</RelativeLayout>
代碼:
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package com.example.zhy_property_animation;
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import android.animation.ObjectAnimator;
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import android.animation.PropertyValuesHolder;
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import android.app.Activity;
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import android.os.Bundle;
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import android.util.DisplayMetrics;
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import android.util.Log;
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import android.view.View;
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import android.widget.ImageView;
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public class ViewAnimateActivity extends Activity
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{
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protected static final String TAG = "ViewAnimateActivity";
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private ImageView mBlueBall;
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private float mScreenHeight;
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.view_animator);
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DisplayMetrics outMetrics = new DisplayMetrics();
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getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
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mScreenHeight = outMetrics.heightPixels;
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mBlueBall = (ImageView) findViewById(R.id.id_ball);
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}
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public void viewAnim(View view)
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{
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mBlueBall.animate()
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.alpha(0)
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.y(mScreenHeight / 2).setDuration(1000)
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.withStartAction(new Runnable()
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{
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@Override
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public void run()
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{
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Log.e(TAG, "START");
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}
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}).withEndAction(new Runnable()
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{
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@Override
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public void run()
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{
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Log.e(TAG, "END");
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runOnUiThread(new Runnable()
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{
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@Override
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public void run()
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{
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mBlueBall.setY(0);
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mBlueBall.setAlpha(1.0f);
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}
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});
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}
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}).start();
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} }
簡單的使用mBlueBall.animate().alpha(0).y(mScreenHeight / 2).setDuration(1000).start()就能實現動畫~~不過需要SDK11,此後在SDK12,SDK16又分別添加了withStartAction和withEndAction用於在動畫前,和動畫後執行一些操作。當然也可以.setListener(listener)等操作。
使用ObjectAnimator實現上面的變化,我們可以使用:PropertyValueHolder
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PropertyValuesHolder pvhX = PropertyValuesHolder.ofFloat("alpha", 1f,
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0f, 1f);
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PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("y", 0,
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mScreenHeight / 2, 0);
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ObjectAnimator.ofPropertyValuesHolder(mBlueBall, pvhX, pvhY).setDuration(1000).start();
效果與上面一樣。
運行結果:
好了,關於屬性動畫基本所有的用法到此結束~~~~
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