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上一篇Android 属性动画(Property Animation) 完全解析 (上)已经基本展示了属性动画的核心用法:
ObjectAnimator实现动画,ValueAnimator实现动画,AnimatorSet的使用等~
当然了属性动画还有一部分的知识点,也能做出很不错的效果,将在本篇博客为您展示~
大家肯定都清楚,View Animator 、Drawable Animator都可以在anim文件夹下创建动画,然后在程序中使用,甚至在Theme中设置为属性值。当然了,属性动画其实也可以在文件中声明:
首先在res下建立animator文件夹,然后建立res/animator/scalex.xml
<?xml version="1.0" encoding="utf-8"?> <objectAnimator xmlns:android="http://schemas.android.com/apk/res/android" android:duration="1000" android:propertyName="scaleX" android:valueFrom="1.0" android:valueTo="2.0" android:valueType="floatType" > </objectAnimator>代码:
public void scaleX(View view) { // 加载动画 Animator anim = AnimatorInflater.loadAnimator(this, R.animator.scalex); anim.setTarget(mMv); anim.start(); }使用AnimatorInflater加载动画的资源文件,然后设置目标,就ok~~是不是很简单,这只是单纯横向的放大一倍~
如果我希望纵向与横向同时缩放呢?则可以怎么定义属性文件:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:ordering="together" > <objectAnimator android:duration="1000" android:propertyName="scaleX" android:valueFrom="1" android:valueTo="0.5" > </objectAnimator> <objectAnimator android:duration="1000" android:propertyName="scaleY" android:valueFrom="1" android:valueTo="0.5" > </objectAnimator> </set>
上篇博客中忽略了一个效果,就是缩放、反转等都有中心点或者轴,默认中心缩放,和中间对称线为反转线,所以我决定这个横向,纵向缩小以左上角为中心点:
代码:
// 加载动画 Animator anim = AnimatorInflater.loadAnimator(this, R.animator.scale); mMv.setPivotX(0); mMv.setPivotY(0); //显示的调用invalidate mMv.invalidate(); anim.setTarget(mMv); anim.start();
下面看效果图:
好了,通过写xml声明动画,使用set嵌套set,结合orderring属性,也基本可以实现任何动画~~上面也演示了pivot的设置。
主要使用LayoutTransition为布局的容器设置动画,当容器中的视图层次发生变化时存在过渡的动画效果。
基本代码为:
LayoutTransition transition = new LayoutTransition(); transition.setAnimator(LayoutTransition.CHANGE_APPEARING, transition.getAnimator(LayoutTransition.CHANGE_APPEARING)); transition.setAnimator(LayoutTransition.APPEARING, null); transition.setAnimator(LayoutTransition.DISAPPEARING, null); transition.setAnimator(LayoutTransition.CHANGE_DISAPPEARING, null); mGridLayout.setLayoutTransition(transition);
过渡的类型一共有四种:
LayoutTransition.APPEARING 当一个View在ViewGroup中出现时,对此View设置的动画
LayoutTransition.CHANGE_APPEARING 当一个View在ViewGroup中出现时,对此View对其他View位置造成影响,对其他View设置的动画
LayoutTransition.DISAPPEARING 当一个View在ViewGroup中消失时,对此View设置的动画
LayoutTransition.CHANGE_DISAPPEARING 当一个View在ViewGroup中消失时,对此View对其他View位置造成影响,对其他View设置的动画
LayoutTransition.CHANGE 不是由于View出现或消失造成对其他View位置造成影响,然后对其他View设置的动画。
注意动画到底设置在谁身上,此View还是其他View。
好了下面看一个综合的例子:
布局文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/id_container" 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:onClick="addBtn" android:text="addBtns" /> <CheckBox android:id="@+id/id_appear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="APPEARING" /> <CheckBox android:id="@+id/id_change_appear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="CHANGE_APPEARING" /> <CheckBox android:id="@+id/id_disappear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="DISAPPEARING" /> <CheckBox android:id="@+id/id_change_disappear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:checked="true" android:text="CHANGE_DISAPPEARING " /> </LinearLayout>
package com.example.zhy_property_animation; import android.animation.LayoutTransition; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.GridLayout; public class LayoutAnimaActivity extends Activity implements OnCheckedChangeListener { private ViewGroup viewGroup; private GridLayout mGridLayout; private int mVal; private LayoutTransition mTransition; private CheckBox mAppear, mChangeAppear, mDisAppear, mChangeDisAppear; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layout_animator); viewGroup = (ViewGroup) findViewById(R.id.id_container); mAppear = (CheckBox) findViewById(R.id.id_appear); mChangeAppear = (CheckBox) findViewById(R.id.id_change_appear); mDisAppear = (CheckBox) findViewById(R.id.id_disappear); mChangeDisAppear = (CheckBox) findViewById(R.id.id_change_disappear); mAppear.setOnCheckedChangeListener(this); mChangeAppear.setOnCheckedChangeListener(this); mDisAppear.setOnCheckedChangeListener(this); mChangeDisAppear.setOnCheckedChangeListener(this); // 创建一个GridLayout mGridLayout = new GridLayout(this); // 设置每列5个按钮 mGridLayout.setColumnCount(5); // 添加到布局中 viewGroup.addView(mGridLayout); //默认动画全部开启 mTransition = new LayoutTransition(); mGridLayout.setLayoutTransition(mTransition); } /** * 添加按钮 * * @param view */ public void addBtn(View view) { final Button button = new Button(this); button.setText((++mVal) + ""); mGridLayout.addView(button, Math.min(1, mGridLayout.getChildCount())); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { mGridLayout.removeView(button); } }); } @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { mTransition = new LayoutTransition(); mTransition.setAnimator( LayoutTransition.APPEARING, (mAppear.isChecked() ? mTransition .getAnimator(LayoutTransition.APPEARING) : null)); mTransition .setAnimator( LayoutTransition.CHANGE_APPEARING, (mChangeAppear.isChecked() ? mTransition .getAnimator(LayoutTransition.CHANGE_APPEARING) : null)); mTransition.setAnimator( LayoutTransition.DISAPPEARING, (mDisAppear.isChecked() ? mTransition .getAnimator(LayoutTransition.DISAPPEARING) : null)); mTransition.setAnimator( LayoutTransition.CHANGE_DISAPPEARING, (mChangeDisAppear.isChecked() ? mTransition .getAnimator(LayoutTransition.CHANGE_DISAPPEARING) : null)); mGridLayout.setLayoutTransition(mTransition); } }
动画有点长,耐心点看,一定要注意,是对当前View还是其他Views设置的动画。
当然了动画支持自定义,还支持设置时间,比如我们修改下,添加的动画为:
mTransition.setAnimator(LayoutTransition.APPEARING, (mAppear .isChecked() ? ObjectAnimator.ofFloat(this, "scaleX", 0, 1) : null));
原本的淡入,变成了宽度从中间放大的效果~~是不是还不错~~
在SDK11的时候,给View添加了animate方法,更加方便的实现动画效果。
布局文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <ImageView android:id="@+id/id_ball" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/bol_blue" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:orientation="horizontal" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="viewAnim" android:text="View Anim" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="propertyValuesHolder" android:text="PropertyValuesHolder " /> </LinearLayout> </RelativeLayout>代码:
package com.example.zhy_property_animation; import android.animation.ObjectAnimator; import android.animation.PropertyValuesHolder; import android.app.Activity; import android.os.Bundle; import android.util.DisplayMetrics; import android.util.Log; import android.view.View; import android.widget.ImageView; public class ViewAnimateActivity extends Activity { protected static final String TAG = "ViewAnimateActivity"; private ImageView mBlueBall; private float mScreenHeight; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.view_animator); DisplayMetrics outMetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(outMetrics); mScreenHeight = outMetrics.heightPixels; mBlueBall = (ImageView) findViewById(R.id.id_ball); } public void viewAnim(View view) { // need API12 mBlueBall.animate()// .alpha(0)// .y(mScreenHeight / 2).setDuration(1000) // need API 12 .withStartAction(new Runnable() { @Override public void run() { Log.e(TAG, "START"); } // need API 16 }).withEndAction(new Runnable() { @Override public void run() { Log.e(TAG, "END"); runOnUiThread(new Runnable() { @Override public void run() { mBlueBall.setY(0); mBlueBall.setAlpha(1.0f); } }); } }).start(); } }
使用ObjectAnimator实现上面的变化,我们可以使用:PropertyValueHolder
PropertyValuesHolder pvhX = PropertyValuesHolder.ofFloat("alpha", 1f, 0f, 1f); PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("y", 0, mScreenHeight / 2, 0); ObjectAnimator.ofPropertyValuesHolder(mBlueBall, pvhX, pvhY).setDuration(1000).start();
运行结果:
好了,关于属性动画基本所有的用法到此结束~~~~
Android 属性动画(Property Animation) 完全解析 (下),布布扣,bubuko.com
Android 属性动画(Property Animation) 完全解析 (下)
原文地址:http://blog.csdn.net/lmj623565791/article/details/38092093